Bolthole Index

Marin County, California

Building permits, zoning and land rules in Marin County, California

42Index Score / 100
#31 of 58 in California

Most construction in unincorporated Marin County, California requires a building permit from the county's Building and Safety Division, although narrow accessory-structure exemptions apply1. Unincorporated land is also subject to the Marin County Development Code, while cities and towns administer their own zoning23. Properties without sewer service need Environmental Health Services involved early because Marin County requires permits for new and replacement septic systems4.

At a glance

Building permit
Required for most construction in unincorporated Marin County; narrow exceptions apply1
Zoning
Title 22 governs all unincorporated areas; cities and towns have their own rules23
Septic permits
Environmental Health Services permits new, replacement, repair, alteration and abandonment work54
Owner-builder
A contractor-license exemption is available under conditions, but permits and inspections still apply6
RV living
Ordinary residential occupancy is not confirmed; camping is limited to campgrounds and hunting and fishing camps78
Tiny homes
The county confirms only a temporary emergency-housing pathway; ordinary use depends on structure type and parcel zoning910
ADUs
Allowed in unincorporated Marin subject to county permits and development requirements; rentals must exceed 30 consecutive days11
Septic soils
Only 1.6% of county soils lack severe limits for a conventional drain field12

Who to call

Building permits

Marin County Community Development Agency - Building and Safety

Building permits, plan review and inspections for unincorporated Marin County

415-473-6550

3501 Civic Center Drive, Suite 308, San Rafael, CA 94903

Zoning

Marin County Community Development Agency - Planning Division

Zoning, development regulations and planning approvals for unincorporated Marin County

415-473-6269

3501 Civic Center Drive, San Rafael, CA 94903

Septic permits

Marin County Community Development Agency - Environmental Health Services

Septic systems, wells and water-system environmental health programs

415-473-6907

3501 Civic Center Drive, Suite 236, San Rafael, CA 94903

Contact details are copied from each office’s official page and were checked against it on September 29, 2026.

Do you need a building permit in Marin County, California?

Most construction projects in unincorporated Marin County require a building permit from Building and Safety1. A one-story detached, non-habitable accessory structure may be exempt when it is no larger than 120 square feet and complies with zoning; a rural tool shed, workshop or horse stall may qualify at up to 300 square feet on a parcel of at least one acre, again subject to zoning1. If the work is not on the county's exception list, assume a permit is needed and ask Building and Safety before starting1. Permitted projects require inspections, and separate reviews or fees may come from Planning, Public Works, Fire, or Environmental Health Services13. Applications dated January 1, 2026 or later fall under the 2025 California Building Standards Code and Marin's local amendments1415.

Who issues Marin County building permits, and how do you reach them?

Marin County Community Development Agency's Building and Safety Division handles permits, plan review and inspections for unincorporated Marin County16. The office is at 3501 Civic Center Drive, Suite 308, San Rafael, CA 94903, and its general number is 415-473-655016. The county uses two application paths: quick online permits for listed maintenance and minor improvements, and plan review for new buildings, additions, remodels, conversions, ADUs, decks, accessory structures, pools and similar larger work17. All building permits begin through the county's online application, and plans for larger projects are submitted electronically and drawn to scale1718. After issuance, schedule each required inspection with Building and Safety; the inspector checks the approved permit documents and the work covered by the permit13.

Does Marin County have zoning?

Marin County Title 22 contains the zoning and subdivision rules for every unincorporated area, while incorporated cities and towns administer their own rules23. Use the Planning Division's parcel lookup to identify the district before applying a dimensional standard19. Agricultural districts have parcel-specific minimum lot areas and height limits; primary structures in the listed agricultural districts generally have a 30-foot limit, while accessory structures in A15 through A60 districts have a 16-foot limit, subject to the code's measurement rules and exceptions2021. Sleepy Hollow parcels zoned R1:BD or A2:BD require at least 1,300 square feet of habitable floor area, excluding porches and garages22. Subdividing land into two or more proposed parcels requires county approval, generally through a Tentative Map followed by a Parcel Map or Final Map23. Ask Planning which standards and overlays apply to the exact parcel24.

How do septic permits work in Marin County?

Marin County Environmental Health Services administers onsite wastewater treatment systems and requires a construction permit for a new septic system54. Permits also cover listed replacement, repair, alteration and abandonment work, while additional permission may be needed in the Coastal Zone or Stream Conservation Area4. Environmental Health Services performs construction inspections, and the septic tank and disposal area cannot be covered before the Health Officer's inspection25. Alternative systems require annual operating permits and professional monitoring25. A property within 400 feet of a public sewer main must connect instead of expanding septic when the Health Officer finds connection physically and legally possible26. Only 1.6% of Marin County soils lack severe limits for a conventional drain field, so a site evaluation should precede a land purchase or house design12. Call Environmental Health Services at 415-473-690727.

Can you live in an RV or tiny home on land in Marin County?

Marin County has not confirmed a general right to live in an RV on a private parcel, and California generally limits RV occupancy to regulated mobilehome or special-occupancy parks unless a local ordinance provides otherwise28. In unincorporated Marin County, camping may occur only in campgrounds and hunting and fishing camps and is limited to 30 days per calendar year per person, except camp staff; the applicable agricultural district may prohibit the use or require a Use Permit7. The county's separate shelter-crisis rule allows temporary emergency housing such as an RV only for someone designated as homeless during the temporary declaration8. Tiny homes need a recognized legal structure classification under California rules10. Marin's emergency tiny-home pathway is temporary and cannot be used as a short-term rental9. Manufactured-home rules for mobile-home parks do not authorize a unit on every parcel; those parks require the applicable health permit, rezoning petition and Master Plan29.

Building a home in Marin County: the steps, in order

  1. Confirm that the parcel is unincorporated, then use the Planning Division's zoning lookup and ask about allowed use, setbacks, flood districts and Coastal Zone constraints319. A qualifying agricultural project in the Coastal Zone needs an approved Coastal Permit Exclusion before building, septic or well permits can issue30.
  1. Confirm legal access because every structure or use must reach a public street through frontage, an easement or a recorded mutual-access agreement acceptable to the Director31. A driveway in a state highway right-of-way also needs a Caltrans encroachment permit32.
  1. Resolve water and wastewater before final design; new and replacement septic systems require county review, and only 1.6% of local soils lack severe conventional-drain-field limits412.
  1. Start the correct online building-permit path and submit scaled electronic plans when plan review is required1718.
  1. Pay applicable fees, obtain the permit, and complete each required inspection before covering work3313.

What should you check before buying land in Marin County?

Check the exact zoning district, jurisdiction and development overlays before relying on a listing description319. In Marin's Primary Floodway district, new buildings and structures are prohibited; the Secondary Floodway district allows underlying uses only under standards and agreements protecting ponding and drainage capacity3435. On qualifying undeveloped parcels in the San Geronimo Valley Stream Conservation Area, an exception analysis limits total parcel coverage to 1,000 square feet and requires the least possible stream-area encroachment36. Verify road access, wastewater feasibility and water before closing because only 1.6% of county soils lack severe conventional-drain-field limitations3112. A new, modified or destroyed well requires a local permit37. If rental income matters, residential rentals shorter than 30 days require county licensing, subject to a countywide cap and township-specific limits38. Marin County's effective property-tax rate is about 0.7%, and the median annual property-tax bill is about $10,0013940.

Watch-outs

  • A permit exemption does not waive Marin County zoning: even a qualifying small accessory structure must comply with the parcel's zoning rules1.
  • Marin County's emergency-shelter authorization for RVs and tiny homes is narrow and does not establish ordinary residential occupancy on private land89.
  • Development in Marin County's Primary Floodway district is far more constrained than ordinary underlying zoning because new buildings and structures are prohibited there34.
  • Camping in unincorporated Marin County is confined to campgrounds and hunting and fishing camps, with district-specific prohibitions or Use Permit requirements7.
  • An ADU in unincorporated Marin County cannot ordinarily be sold separately and may be rented only for longer than 30 consecutive days11.

Sources

  1. Do I need a building permit?, quoted and re-checked
  2. Title 22 - Development Code, quoted and re-checked
  3. Title 22 - Development Code, quoted and re-checked
  4. Septic systems/onsite wastewater treatment systems, quoted and re-checked
  5. Septic systems/onsite wastewater treatment systems, quoted and re-checked
  6. California Business and Professions Code section 7044, quoted and re-checked
  7. Title 22 - Development Code, quoted and re-checked
  8. County Declares Shelter Crisis to Provide Temporary Emergency Housing, quoted and re-checked
  9. Emergency temporary housing under Marin's Shelter Crisis, quoted and re-checked
  10. Information Bulletin 2016-01: Tiny Homes (California statewide rule), quoted and re-checked
  11. Title 22 - Development Code, quoted and re-checked
  12. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  13. Schedule a building inspection, quoted and re-checked
  14. Approved Building Standards (California statewide rule), quoted and re-checked
  15. 2025: District 4 Rodoni Reports, quoted and re-checked
  16. Marin County Community Development Agency - Building and Safety (marincounty.gov)
  17. How to apply for a building permit, quoted and re-checked
  18. Submit plans before starting a big job, quoted and re-checked
  19. Title 22 - Development Code, quoted and re-checked
  20. Marin County Code - Title 22, Development Code, quoted and re-checked
  21. Marin County Code - Title 22, Development Code, quoted and re-checked
  22. Marin County Code - Title 22, Development Code, quoted and re-checked
  23. Title 22 - Development Code, quoted and re-checked
  24. Marin County Community Development Agency - Planning Division (marincounty.gov)
  25. Septic systems/onsite wastewater treatment systems, quoted and re-checked
  26. Regulations for Design, Construction and Installation of Individual Sewage Disposal Systems, quoted and re-checked
  27. Marin County Community Development Agency - Environmental Health Services (marincounty.gov)
  28. Information Bulletin 2016-01: Tiny Homes (California statewide rule), quoted and re-checked
  29. Marin County Code Title 22 Development Code, quoted and re-checked
  30. Coastal Permit Categorical Exclusions, quoted and re-checked
  31. 2023 Development Code, quoted and re-checked
  32. Encroachment Permits | Caltrans (California statewide rule), quoted and re-checked
  33. Planning Division Fees, quoted and re-checked
  34. Marin County Code - Title 22, Development Code, quoted and re-checked
  35. Marin County Code - Title 22, Development Code, quoted and re-checked
  36. Marin County Code - Title 22, Development Code, quoted and re-checked
  37. Well Standards (California statewide rule), quoted and re-checked
  38. Short Term Rental (STR) License, quoted and re-checked
  39. Effective property tax rate: Bolthole Index county data
  40. Median property tax bill: Bolthole Index county data

Written September 29, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

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County locator

Marin County in California

42
County map
Marin County highlighted among the California counties · colored by Index score

How Marin County scores

Seclusion22100% ev.
Self-Sufficiency53100% ev.
Admin Boringness40100% ev.
Durability35100% ev.
Property Autonomy56100% ev.
Carry Cost54100% ev.

Evidence strength: 100%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$1504kTypical home
0.7%Property tax
$7,636Land / acre
35.8"Annual rain
34.4% of yrsSevere drought
2.5 / yr (+1.6)Mid-century 100°F days
82.4 daysMid-century dry spell
2.66" (+8.7%)Mid-century 1-day rain
1.07×Wildfire change factor
100%Forward climate coverage
$2,651Home insurance / yr
7.2% / yrInsurance growth
0.88%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
129,291People within 30 min
8,298,435People within 2 hr
405,078Radius comparison (15 mi)
488.8People / sq mi
28%Federal land
42.8%Land at 15% slope or less
1.6%Septic soil without severe limits
3,674 acWorkable land screen
55.2%Wooded land
117.9 tonsBiomass / forest ac
56.3°FAvg temp

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Answers from the rulebook for Marin County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Marin County rules

  • Building permitRequired

    Most construction projects in unincorporated Marin County administered by the Marin County Building and Safety Division.

    • Exceptions include one-story detached non-habitable accessory structures of 120 square feet or less that comply with zoning regulations.
    • Large tool sheds, workshops, or horse stalls may be exempt when in a rural area on property of one acre or more, 300 square feet or less, and compliant with zoning regulations.
    • Other listed exemptions include qualifying playground equipment, shallow above-ground pools, qualifying fences, certain sidewalks and driveways, agricultural shade cloth structures, qualifying retaining walls, qualifying water tanks, finish work, moveable fixtures, and certain window awnings.
    • If a project is not listed among the exceptions, the county states that a building permit is probably required.
    “Most construction projects require a building permit but here are some exceptions.”
  • Building code adoptedAdopted (with conditions)

    The California Building Standards Code and Marin-specific local amendments adopted by the Marin County Board of Supervisors for countywide application.

    • The update was adopted December 9, 2025.
    • The updated state regulations take effect January 1, 2026.
    • The code includes state-mandated provisions and local amendments.
    • A Marin-specific restriction prohibits fire-retardant treated wood in exterior construction within designated Wildland Urban Interface and Very High Fire Hazard Severity Zones.
    • Further policy review of fire-retardant-treated wood was contemplated after adoption.

    effective date: 2026-01-01 (Updated state regulations take effect on this date.)

    “December 9, 2025 - The Marin County Board of Supervisors adopted updates to the California Building Standards Code, incorporating local amendments that apply countywide. The updated code includes new state-mandated provisions as well as a Marin-specific restriction that prohibits the use of fire-retardant treated wood (FRT) in exterior construction within designated Wildland Urban Interface (WUI) and Very High Fire Hazard Severity Zones.”
    One more reviewed finding on this topic
    • Adopted (with conditions) — Marin County's building standards for unincorporated Marin, including the 2025 California Building Standards Code and Marin-specific local amendments.
      “December 9, 2025 - The Marin County Board of Supervisors adopted updates to the California Building Standards Code, incorporating local amendments that apply countywide.”
  • InspectionsRequired

    Building permit projects subject to Marin County Building and Safety Division inspection requirements in unincorporated Marin County.

    • Inspections are required by the permit.
    • The permit number, project address, and inspection number are needed to request an inspection.
    • The inspector checks the permit, plans, and other permit documents.
    • Inspection groups include foundation, framing, electrical, plumbing, and mechanical work.
    • Other agencies, including Fire, Public Works, Planning, and Environmental Health and Safety, may require separate inspections and fees.
    “Building and Safety Division inspections are required by your permit.”
  • County-wide zoningPresent (with conditions)

    Zoning and subdivision regulation in all unincorporated areas of Marin County; certain code sections apply in the Coastal Zone by reference.

    • The cited county zoning rules apply to unincorporated areas, not incorporated cities or towns.
    • Certain sections apply in the Coastal Zone by reference.
    “This is the set of zoning and subdivision rules for all unincorporated areas of Marin County.”
  • Local zoningVaries (with conditions)

    Aggregate local zoning across Marin County: the County administers zoning for unincorporated areas, while incorporated cities and towns administer their own planning and zoning laws.

    • For incorporated areas, the applicable city or town council's planning and zoning laws govern.
    • For unincorporated areas, Marin County provides local government and the Board of Supervisors makes the laws.
    • This is an aggregate countywide conclusion and does not claim that Marin County administers each incorporated municipality's ordinance.
    “If you live in an incorporated area, your town or city council will make laws related to: Planning and zoning”
    One more reviewed finding on this topic
    • Varies (with conditions) — Aggregate local zoning across Marin County: County zoning applies in unincorporated areas, while incorporated cities and towns make their own planning and zoning laws.
      “If you live in an incorporated area, your town or city council will make laws related to: Planning and zoning [...] Other areas of Marin are “unincorporated” and don’t have their own local government. Instead, the County of Marin provides essential services and the Board of Supervisors makes the laws.”
  • Zoning districtsPublished

    Zoning districts and zoning rules in unincorporated Marin County.

    • Title 22 contains the county's zoning and subdivision rules for all unincorporated areas.
    • Specific zoning and property information is obtained through the County's address or Assessor Parcel Number lookup tool.
    • Some Title 22 sections apply in the Coastal Zone by reference.
    “This is the set of zoning and subdivision rules for all unincorporated areas of Marin County. Certain sections of this code apply in the Coastal Zone by reference.”
  • Minimum dwelling sizeDistrict specific (with conditions)

    Dwelling units in the Sleepy Hollow area zoned R1:BD or A2:BD.

    • The rule applies to the area identified by the Countywide Plan as Sleepy Hollow and zoned R1:BD or A2:BD.
    • The minimum is habitable floor area and excludes porches and garages.

    minimum habitable floor area: >= 1300 sq ft (Porches and garages are excluded.)

    “The following standards shall apply in the area identified by the Countywide Plan as Sleepy Hollow that is zoned R1:BD or A2:BD. [...] The habitable floor area of each dwelling unit shall contain a minimum of 1,300 square feet, exclusive of porches and garage(s).”
  • Minimum lot sizeDistrict specific (with conditions)

    New development and subdivisions in Marin County agricultural zoning districts A2, A3, A5, A10, A15, A20, A30, A40, A60, and ARP.

    • A2 standards may change when combined with a B district.
    • A2 minimum lot area may change under hillside subdivision standards.
    • In A3-A60 districts, minimum lot area and setback standards may be waived for clustering under Chapter 22.44, but total lots may not exceed the maximum based on total acreage and district minimum lot area.
    • In ARP districts, minimum lot area is determined through the subdivision and/or Master Plan process.

    A2 minimum lot area: 2 acres (Subject to applicable B-combining-district and hillside-subdivision standards.) · A3 minimum lot area: 3 acres · A5 minimum lot area: 5 acres · A10 minimum lot area: 10 acres · A15 minimum lot area: 15 acres · A20 minimum lot area: 20 acres · A30 minimum lot area: 30 acres · A40 minimum lot area: 40 acres · A60 minimum lot area: 60 acres

    “A2 2 acres [...] A3 3 acres [...] A5 5 acres [...] A10 10 acres [...] A15 15 acres [...] A20 20 acres [...] A30 30 acres [...] A40 40 acres [...] A60 60 acres [...] In ARP districts, minimum lot area is determined through the subdivision and/or Master Plan process.”
  • Lot coverageSpecified

    Undeveloped parcels in the San Geronimo Valley Stream Conservation Area where development cannot be accomplished outside the Stream Conservation Area.

    • The parcel must be undeveloped as of the effective date of the applicable section.
    • The parcel must fall entirely within the Stream Conservation Area, or development outside it must be infeasible even if limited to the stated lot coverage.
    • An exception requires an application supported by good cause and public noticing and is subject to Chapter 22.114 appeals.

    maximum lot coverage for exception analysis: <= 1000 sq ft (Applies to development on the parcel as a whole with the least possible encroachment into the Stream Conservation Area.)

    “Exceptions to full compliance with all Stream Conservation Area criteria and standards in Subsection 2b, above, may be allowed only if the parcel is undeveloped as of the effective date of this Section and following is true: [...] Cannot be accomplished even if the proposed development is limited to 1,000 square feet or less of lot coverage on the parcel as a whole with the least possible encroachment into the Stream Conservation Area, or relocated to another suitable portion of the parcel that avoids encroachment in the Stream Conservation Area;”
  • Building heightDistrict specific (with conditions)

    Primary and accessory structures in Marin County agricultural zoning districts.

    • The agricultural district table provides district-specific height limits.
    • Height measurement and exceptions are governed by Marin County Code § 22.20.060.
    • ARP primary and accessory heights are 30 feet and 16 feet, respectively.

    A2-A10 primary height limit: 30 ft (Subject to height-measurement and height-limit exceptions.) · A15-A60 primary height limit: 30 ft (Subject to height-measurement and height-limit exceptions.) · A15-A60 accessory height limit: 16 ft (Subject to height-measurement and height-limit exceptions.)

    “Height Limit (5) [...] A15 15 acres Not applicable 40 ft. 40 ft. 40 ft. 30 ft. 16 ft. 0.05 [...] ARP See note 2 See Zoning Map Not applicable 30 ft. 16 ft. N.A. [...] See Section 22.20.060 (Height Measurement and Height Limit Exceptions) for height measurement and exceptions.”
  • Living in an RVTemporary only (with conditions)

    Occupancy of recreational vehicles as temporary emergency shelter in unincorporated Marin County during the County's shelter-crisis designation.

    • The shelter-crisis designation was adopted at the Board of Supervisors' March 11, 2025 meeting and is in place for three years.
    • The rule applies only in the unincorporated areas of Marin County.
    • Only a person currently designated as homeless may live in temporary emergency housing created through the crisis declaration.
    • Private property owners may legally add temporary shelter without a permanent foundation under the concurrently adopted building-code provisions.
    • County-property projects bypass local zoning requirements and environmental review; this exception does not establish unrestricted RV occupancy on private parcels.
    • The source does not state that ordinary, non-emergency residential RV occupancy is allowed.

    shelter-crisis duration: three years · permanent foundation: false (temporary emergency shelter may be without a permanent foundation)

    “Marin County, CA – The Marin County Board of Supervisors declared a “shelter crisis” at its March 11 meeting, a move that, partnered with changes to the building code, enables the addition of emergency shelter such as for removable cabins or recreational vehicles. The crisis designation will be in place for three years and allows a wider range of solutions for temporary shelter. [...] No funding is provided to build temporary emergency shelters or emergency housing units, and the declaration would apply only to the unincorporated areas of Marin County. Only someone currently designated as homeless could live in any of the temporary emergency housing created through this crisis declaration.”
    One more reviewed finding on this topic
    • Allowed (with conditions) — Recreational vehicles used as temporary emergency shelter during Marin County's declared shelter crisis in unincorporated Marin.
      “Marin County, CA – The Marin County Board of Supervisors declared a “shelter crisis” at its March 11 meeting, a move that, partnered with changes to the building code, enables the addition of emergency shelter such as for removable cabins or recreational vehicles.”
  • Camping on your landLimited

    Camping and campgrounds on private property in unincorporated Marin County.

    • Camping may occur only in campgrounds and hunting and fishing camps.
    • Camping is limited to a maximum of 30 days per calendar year per person, except for camp staff.
    • Campgrounds must have adequate water supply and sanitary or septic systems.
    • Campgrounds must have regular garbage pickup service and comply with Marin County Code Section 22.20.100.
    • Article II zoning tables identify Camping and Campgrounds as prohibited in the A2 district and conditionally permitted subject to Use Permit approval in the A3-A60 and ARP districts; coastal-zone rules may also apply by reference.

    maximum camping duration: 30 days per calendar year per person (except for camp staff)

    “Camping and campgrounds on private property are subject to the requirements of this section. A. Camping shall occur only in campgrounds and hunting and fishing camps. B. Camping is only allowed for a maximum of 30 days per calendar year per person, except for camp staff.”
  • Tiny homesAllowed (with conditions)

    Tiny homes, including tiny homes on wheels, used as emergency housing during Marin County's declared shelter crisis.

    • The Shelter Crisis Declaration applies only in unincorporated Marin.
    • The authorization is during the shelter crisis and concerns emergency housing.
    • The housing cannot be used as a short-term rental.
    • The total number of units depends on property zoning and essential site infrastructure, including water and wastewater systems.
    • Septic systems require applicable Environmental Health Services review, inspection, and potentially engineering or upgrades.

    foundation requirement: without permanent foundation · short-term rental use: false (Any structures built or reconfigured under the Shelter Crisis Declaration cannot be used as a short-term rental.)

    “The amended Building Code under the Shelter Crisis Declaration allows for the installation of emergency housing without permanent foundation, such as tiny homes, tiny homes on wheels and mobile homes.”
  • Manufactured homesLimited

    Occupancy of mobile/manufactured homes in mobile home parks governed by Marin County Development Code Title 22.

    • The rule applies to areas set aside for mobile home parks and does not establish general authorization for a manufactured home on every parcel.
    • Mobile home parks require a minimum site area of 10 contiguous acres.
    • Maximum density in the RX zoning district is set through rezoning and Master Plan approval and may not exceed 10 mobile homes of 750 square feet or less per acre, or eight mobile homes larger than 750 square feet per acre, or a combination.
    • Before occupancy of the first mobile home, at least 50 mobile home lots must be prepared and available for occupancy.
    • Two parking spaces are required per mobile home lot, with at least one on or immediately adjoining each lot.
    • Structures and mobile homes must be set back at least 25 feet from property lines and streets or public rights-of-way, or observe a greater established building line.
    • A County Health Department permit is required under County Code Chapter 7.44.
    • Utilities must be underground; maximum heights are 15 feet for mobile homes and accessory structures and 30 feet for service facilities.
    • A zoning-district-change petition and Master Plan must be filed simultaneously with the Agency; all applicable County and State laws remain applicable.

    minimum mobile home park site area: >= 10 contiguous acres · maximum density for mobile homes 750 square feet or less: <= 10 mobile homes per acre (in the RX zoning district and subject to Master Plan approval) · maximum density for mobile homes over 750 square feet: <= 8 mobile homes per acre (in the RX zoning district and subject to Master Plan approval) · minimum lots prepared before first occupancy: >= 50 mobile home lots · minimum setback: >= 25 feet (unless a greater building line has been established by ordinance)

    “Prior to occupancy of the first mobile home, not less than 50 mobile home lots shall be prepared and available for occupancy.”
  • Accessory dwellingsAllowed (with conditions)

    Accessory dwelling units in the unincorporated portions of Marin County.

    • ADUs may not be sold or otherwise conveyed separately from the primary dwelling unit, except as provided under State law.
    • ADUs may be rented only for terms longer than 30 consecutive days.
    • Category 1 ADUs must satisfy the listed state-law and County criteria, including applicable existing-building or outbuilding location, floor-area, setback, height, and unit-count limits.
    • Category 2 ADUs require Accessory Dwelling Unit Permit approval.
    • Category 2 attached and detached ADUs generally may not exceed 1,200 square feet, subject to the stated bedroom-size exceptions and floor-area-ratio limits.
    • ADU permit applications are processed under the ministerial planning-permit procedures; the Director must approve or deny a complete application within 60 days.
    • Applicable zoning, building, health, septic, and other County and State requirements continue to apply.

    Category 1 detached ADU maximum floor area: <= 800 square feet · Category 1 detached ADU maximum height: <= 18 feet above grade (two additional feet may be allowed to match the primary dwelling roof pitch) · Category 2 detached ADU maximum floor area: <= 1200 square feet (one-bedroom units up to 850 square feet and two-or-more-bedroom units up to 1,000 square feet are allowed notwithstanding floor-area restrictions) · ADU rental term: > 30 consecutive days · ADU permit decision deadline: 60 days after application is complete

    “The provisions of this Section shall apply to Accessory Dwelling Units in the unincorporated portions of the County. [...] The Director shall approve or deny an Accessory Dwelling Unit Permit within 60 days of finding the application complete.”
    One more reviewed finding on this topic
    • Allowed (with conditions) — Accessory dwelling units in unincorporated Marin County.
      “If you're interested in building an ADU in unincorporated Marin, we encourage you to get in touch with our Planning team. You can also find helpful resources on ADUMarin.”
  • Who permits septicCounty

    Onsite wastewater treatment and septic systems in Marin County.

    • The administering office is Marin County Environmental Health Services.
    • Additional permits or permissions may be required for properties in the Coastal Zone or Stream Conservation Area.
    “Our staff help: Oversee property evaluations and percolation testing. Process permits for new and replacement septic systems.”
  • Septic permitRequired

    New, replacement, repair, alteration, or abandonment of septic systems in Marin County.

    • A septic construction permit is required before constructing a septic system.
    • A permit is required for replacing or repairing a septic tank; excavating or altering/replacing disposal-field components; replacing sand media or gravel; replacing a pretreatment unit or other system component; and abandoning a septic tank or system.
    • Repairing plumbing outside the disposal field, replacing or maintaining pumps or control panels, purging or routine maintenance of the disposal field, and sealing, repairing, or installing risers or effluent filters are listed as exempt from a septic permit, though building or electrical permits may still be required where stated.
    • Additional permits or permissions may be required in the Coastal Zone or Stream Conservation Area.
    • An application fee is due upon application submittal under the current fee schedule.
    “Apply for a septic construction permit. Obtain the permit to construct a septic system.”
  • Septic inspectionRequired

    Installation of permitted septic systems in Marin County.

    • Environmental Health Services conducts several construction inspections throughout installation.
    • The system may not be covered until inspection is performed by the Health Officer.
    • After the system is determined to be installed in accordance with approved plans, the County issues a certificate of installation.
    • Alternative systems require an annual operating permit and professional monitoring.
    “The septic tank and drainfield/absorption area may not be covered until an inspection is performed by the Health Officer.”
  • Off-grid sanitationLimited

    Off-grid sanitation using onsite wastewater treatment systems and graywater systems in Marin County.

    • Marin County Environmental Health Services processes permits for new and replacement septic systems.
    • A septic construction permit is required for constructing a septic system; additional permits or permissions may be required in the Coastal Zone or Stream Conservation Area.
    • A permit is required for replacing or repairing a septic tank, excavating or altering/replacing disposal-field components, replacing sand or gravel in a pretreatment unit or disposal field, replacing a pretreatment unit or other system component, or abandoning a septic tank or system.
    • Exempt septic activities include repairing plumbing outside the disposal field, replacing or maintaining pumps or control panels, purging or routine maintenance of the disposal field, and sealing, repairing, or installing risers or effluent filters; other building, plumbing, or electrical permits may still be required.
    • A graywater clothes-washer system serving up to two families does not require a permit but requires notification before installation.
    • A graywater simple system serving up to two families with daily output less than 250 gallons does not require a permit but requires notification before installation.
    • A complex residential graywater system discharging over 250 gallons per day requires a County construction permit and a Building and Safety permit.
    • An on-site treated non-potable graywater system requires treatment steps and a Building and Safety permit before construction.
    • Graywater discharge must be covered by at least 2 inches of approved cover; it must not pool, run off, or flow to a neighboring property; disposal fields or mulch basins must be at least 5 feet from property lines and at least 100 feet from wells and waterways.

    simple graywater daily output: < 250 gallons per day (Systems at or above 250 gallons per day are not within the stated simple-system threshold.) · complex residential graywater daily discharge: > 250 gallons per day (Requires County construction permit and Building and Safety permit.) · graywater approved cover: >= 2 inches · graywater disposal field or mulch basin setback from property line: >= 5 feet · graywater disposal field or mulch basin setback from wells and waterways: >= 100 feet

    “Obtain the permit to construct a septic system. (Additional permits or permissions may be required for properties in the Coastal Zone or the Stream Conservation Area).”
  • Well permitRequired

    Drilling water wells and related well categories, well destruction, and operation of installed wells for drinking water in unincorporated Marin County.

    • A permit must be issued before drilling a private water well.
    • The driller must possess a current and active C-57 California license.
    • The driller is responsible for scheduling inspections after permit issuance.
    • If a drilling attempt is unsuccessful, a permit may be needed to destroy the well.
    • A permit to operate a domestic water supply is needed when well water is used for domestic purposes, including drinking water.
    • The County's official local-authority table identifies EHS as the permitting authority for unincorporated Marin County for drinking-water wells, irrigation wells, well destruction, cathodic-protection wells, monitoring wells, and test holes.
    • Installed wells require an EHS permit to operate before being used for drinking water.
    • The table states that water-well permitting authority can differ inside incorporated cities; this claim is limited to unincorporated Marin County.

    well drilling permit timing: before drilling · domestic drinking-water operation permit: required before use · driller license: C-57 California license (Current and active license required.)

    “Apply for permit to drill a water well and pay the application fee.”
  • Mandatory utility hookupSewer (with conditions)

    Expansion, repair, or modification of an existing individual sewage disposal system where a public sewer main may be available.

    • If the property is within 400 feet of a public sewer main and connection is physically and legally possible as determined by the Health Officer, septic-system expansion is prohibited and connection to public sewer is required.
    • If those criteria are not met, the septic system may be enlarged or relocated under the County regulations.
    • For repairs, if connection is impossible or impractical and a standard drainfield cannot be used, the Health Officer may consider an alternative design.
    • The actual sewer provider and connection procedures vary by sanitary district or other service area.

    distance to public sewer main: <= 400 feet (Connection must also be physically and legally possible as determined by the Health Officer.)

    “no expansion of the existing sewage disposal system will be allowed and connection to a public sewer will be required.”
  • Agricultural exemptionConditional

    Specified agricultural projects in the Marin County Coastal Zone seeking exclusion from Coastal Permit requirements.

    • The property must be zoned agricultural (C-ARP or C-APZ).
    • The project must be outside the area bounded by the mean high tide line and the first public road paralleling the sea or one-half mile inland, whichever is less.
    • The project must be outside tidelands, submerged lands, public trust lands, wetlands, beaches, and lots immediately adjacent to the inland extent of any beach or the mean high tide line where there is no beach.
    • Listed agricultural projects include barns, storage, equipment and other necessary buildings; dairy pollution projects; agriculturally related storage tanks and water distribution lines; water impoundments not exceeding 10 acre-feet in specified areas; electric utility lines; and new non-solid farm or ranch fencing.
    • A Coastal Permit Exclusion must be approved before issuance of building, septic, or well permits.

    maximum water impoundment: <= 10 acre-feet (Must be in canyons and drainage areas not identified as blue line streams on USGS 7 1/2 Minute Quad Sheets.)

    “Per the Categorical Exclusion Order E-81-2 and Order E-81-6, agricultural projects are categorically excluded when located: 1. On property zoned agricultural (C-ARP or C-APZ); 2. Outside the area bounded by the mean high tide line and the first public road paralleling the sea or ½ mile inland, whichever is less; 3. Outside tidelands, submerged lands, public trust lands, wetlands, beaches, or on lots immediately adjacent to the inland extent of any beach (or of the mean high tide line of the sea where there is no beach).”
  • Subdividing landRegulated (with conditions)

    Subdivision of existing parcels into two or more proposed parcels in unincorporated Marin County.

    • The general process requires County approval, generally first through a Tentative Map and then a Parcel Map or Final Map.
    • Tentative and Final Maps are generally required for subdivisions creating five or more parcels, subject to listed exceptions.
    • A Parcel Map is required instead of a Final Map in specified exceptions.
    • Agricultural leases, among other listed categories, do not require filing or approval of Tentative, Parcel, or Final Maps.
    • The California Subdivision Map Act controls in the event of conflict.

    parcel threshold for general Tentative and Final Map requirement: >= 5 parcels (Exceptions include original parcel under five acres with public-street frontage and no required dedications or improvements; each created parcel at least 20 acres with approved access; specified industrial/commercial street access; each parcel at least 40 acres; or an environmental subdivision.)

    “The Map Act and this Development Code require that the subdivision of an existing parcel into two or more proposed parcels be first approved by the County. In general, the procedure for subdivision first requires the approval of a Tentative Map, and then the approval of a Parcel Map or Final Map to complete the subdivision process.”
  • Driveway accessRequired

    Every structure or use in unincorporated Marin County requiring access to a public street.

    • Access may be through a public street, permanent public or private easement, or recorded reciprocal mutual access agreement.
    • The Director determines whether the access arrangement satisfies the standard.
    • Driveways must comply with Chapter 24.04 Improvements and applicable fire protection district regulations.
    “Every structure or use shall have frontage upon a public street or permanent means of access to a public street by way of a public or private easement or recorded reciprocal (mutual) access agreement, as determined by the Director.”
  • Building in a floodplainLimited

    Development within the Secondary Floodway (F-2) combining district in unincorporated Marin County.

    • Uses authorized by the governing zoning district may be permitted subject to established design standards.
    • No building, structure, levee, dike, fill, or other activity may reduce the ponding area or capacity of any parcel.
    • Before activity, the property owner must enter an agreement with the County, Marin County Flood Control and Water Conservation District, or another appropriate public agency.
    • The agreement must address ponding/overflow, dedication of F-1 lands, drainage improvements, and may require a performance bond.
    • Full parcel use requires specified ultimate flood-control channel improvements and downstream construction to the mouth of the primary floodway.
    “Those uses authorized by the governing zoning district may be permitted on lands within an F-2 district subject to the established design standards.”
    One more reviewed finding on this topic
    • Limited — Buildings and structures within the Primary Floodway (F-1) combining district in unincorporated Marin County.
      “No buildings or structures shall be constructed within an F-1 district.”
  • Short-term rentalsLimited

    Residential-unit rentals for fewer than 30 days in unincorporated Marin County.

    • Operators should obtain a Short-Term Rental License, Business License, and Transit Occupancy Tax Certificate.
    • With few exceptions, operators must first obtain the STR License before applying for the Business License and TOT Certificate.
    • The total number of STR licenses is limited to 1,200, excluding Dillon Beach.
    • Additional township-specific caps apply, including in Bolinas, Dillon Beach, Fallon, Forest Knolls, Inverness, Lagunitas, Marshall, Muir Beach, Muir Woods Park, Nicasio, Olema, Petaluma, Point Reyes Station, San Geronimo, Stinson Beach, Tomales, Valley Ford, and Woodacre.
    • Hotels, motels, agricultural homestays, B&Bs, campgrounds, and qualifying agricultural properties of at least ten acres with commercial agriculture as the primary use do not require an STR License.
    • STR parking must comply with Marin County Code Sections 24.04.340 and 24.04.380; the stated parking standard does not apply to STRs legally operated as of January 1, 2024.

    maximum countywide STR licenses: 1200 licenses (Dillon Beach licenses excluded) · new STR License Application: 600 USD (non-primary-home STR) · new Primary Home STR License Application: 300 USD (primary home) · STR License Renewal Application: 300 USD (renewed every two years) · Primary Home STR License Renewal Application: 150 USD (renewed every two years) · STR License Waitlist Registration: 50 USD annually (where applicants exceed available licenses)

    “The total number of STR licenses allowable in unincorporated Marin County is limited to one thousand two hundred, not including STR licenses in Dillon Beach.”
  • Permit feesPublished (with conditions)

    Planning permits and related planning services in unincorporated Marin County.

    • The Planning Division confirms permit fees after reviewing the proposed application package.
    • Fees are collected when the application package is accepted.
    • Fees are paid upfront at application submission.
    • If a project needs more than one permit, the highest Planning Fee is charged at full price and additional permits cost half the regular Planning Fee.
    • Department of Public Works fees apply to specified projects, including projects on FEMA flood zones and significant driveway, parking-area, or parking-structure modifications.
    • Environmental Health Services fees apply to projects on properties with wells or septic systems.
    • Some fees are deposits and additional costs may be billed if actual costs exceed the deposit.

    additional permit planning fee: half of regular Planning Fee · fee payment timing: at application submission

    “The Planning Division Fee Schedule includes all fees for Planning Permits and other planning services.”
  • Permit processPublished (with conditions)

    Digital plan submittal and review for larger building permit projects in unincorporated Marin County.

    • Plans must be submitted electronically and drawn to scale.
    • The process includes correction and clarification requests when case-dependent.

    intake processing: 3 days · pre-screen: 15 days · initial plan review: 2–4 weeks · pre-issuance/fee assessment: 3–5 days · fee payment and permit issuance: 3 days

    “Submit application online with your deposit fee: 3 days processing time for in-take”
    One more reviewed finding on this topic
    • Published (with conditions) — County building permit application process for projects in unincorporated Marin County.
      “Understand which permit process applies to you. We have 2 processes depending on what you need.”

California rules that apply here

  • Owner-builder exemptionAvailable (with conditions)

    Exemption from California contractor-licensing chapter for an owner-builder who builds or improves a structure on the owner’s property; this does not itself establish exemption from local building permits, inspections, or other code requirements.

    • For work personally performed by the owner or performed by the owner’s employees, none of the improvements may be intended or offered for sale, and employee compensation must be wages as their sole compensation.
    • For work directly contracted to licensed trade contractors, the owner must directly contract with licensees duly licensed for the respective trades.
    • For single-family residential structures under the licensed-contractor arrangement, no more than four structures may be intended or offered for sale in a calendar year; this limitation does not apply if the owner contracts with a general contractor for construction.
    • For a homeowner improving a principal residence or its appurtenances, the work must be performed before sale, the homeowner must have actually resided in the residence for the 12 months before completion, and the homeowner must not have used this exemption on more than two structures more than once during any three-year period.
    • A nonprofit corporation may qualify when assisting an owner-builder participating in a mutual self-help housing program.
    • Sale or offering for sale within one year after completion creates a rebuttable presumption that the structure was undertaken for sale; sale or offering for sale of five or more structures within one year creates a conclusive presumption.
    • This is a contractor-licensing exemption and should not be treated as a building-permit exemption.

    single-family structures intended or offered for sale: <= 4 structures per calendar year (Does not apply if the owner contracts with a general contractor for construction.) · prior residence occupancy: >= 12 months before completion (Applies to the principal-residence homeowner exemption.) · owner-builder exemption use: <= 2 structures during any three-year period (The statute states the homeowner has not availed himself or herself of the exemption on more than two structures more than once during any three-year period.) · sale presumption period: 1 year after completion (Sale or offering for sale creates a rebuttable presumption; five or more structures creates a conclusive presumption.) · conclusive-presumption threshold: >= 5 structures within one year after completion (Structures sold or offered for sale by the owner-builder.)

    “This chapter does not apply to any of the following: (1) An owner who builds or improves a structure on his or her property”
    3 more reviewed findings on this topic
    • Available (with conditions) — California owner-builders who build or improve structures on their property or improve a principal residence, subject to Business and Professions Code section 7044 conditions.
      “The owner directly contracts with licensees who are duly licensed to contract for the work of the respective trades involved in completing the project.”
    • Conditional — Owners who build or improve structures on their own property, and homeowners improving their principal residence or appurtenances, subject to Business and Professions Code section 7044.
      “(a) This chapter does not apply to any of the following: (1) An owner who builds or improves a structure on his or her property”
    • Available (with conditions) — California contractor-licensing requirements for an owner who builds or improves a structure on the owner’s property; this is not stated as an exemption from building permits, inspections, or other code requirements.
      “This chapter does not apply to any of the following: (1) An owner who builds or improves a structure on his or her property”
  • Certificate of occupancyRequired

    Completed construction projects within HCAI jurisdiction involving California health facilities.

    • The HCAI Compliance Officer issues the project-completion Substantial Compliance or Certificate of Occupancy once required conditions are met.
    • The stated examples include delivery of all test reports to the Inspector of Record, clearance of outstanding items, and completion of the Testing, Inspection and Observation Program.
    • Once construction is completed, the certificate of occupancy allows the owner to apply to the Department of Health Services for a license to operate the health facility.
    “Issues the certificate of occupancy and/or construction final.”
  • SetbacksSpecified

    Qualifying SB 9 housing developments in single-family residential zones, including development of up to two primary residential units, subject to the cited statutory eligibility requirements and local ministerial review.

    • The parcel must be located in a single-family residential zone.
    • The project must involve no more than two residential units.
    • Objective standards may be applied only if they do not physically preclude the statutory housing objectives, subject to the stated exceptions.
    • No setback may be required for an existing structure or a structure constructed in the same location and to the same dimensions as an existing structure.
    • For SB 9 projects, side and rear setbacks may not exceed four feet; a local agency may apply a lesser setback, such as 0–4 feet.
    • The local agency cannot apply existing side and rear setbacks applicable in the single-family residential zones.
    • The four-foot side and rear setback standards are not subject to modification.
    • The fact sheet cites Government Code Sections 65852.21(b)(2)(B) and 66411.7(c)(3).

    maximum side setback: <= 4 feet (A local agency may choose to apply a lesser setback, including 0–4 feet.) · maximum rear setback: <= 4 feet (A local agency may choose to apply a lesser setback, including 0–4 feet.)

    “SB 9 establishes an across-the-board maximum four-foot side and rear setbacks.”
    One more reviewed finding on this topic
    • District specific (with conditions) — Building setbacks, side and rear yard requirements, and property line requirements under California's State Housing Law framework.
      “building setback, side and rear yard requirements, and property line requirements are hereby specifically and entirely reserved to the local jurisdictions”
  • Campground & park staysLimited

    Occupancy and use of manufactured homes and mobilehomes in California mobilehome parks and other locations subject to HCD jurisdiction.

    • HCD administers titling and registration for manufactured homes and mobilehomes.
    • HCD-inspected mobilehome parks are subject to health and safety enforcement where local government has not assumed enforcement.
    • Manufactured/mobilehome park regulations address construction, use, maintenance, and occupancy.
    • Separate local land-use, building, fire, health, and utility requirements may apply.
    “MHs may be occupied outside or inside of mobilehome parks and installation and approval for occupancy is governed by the Mobilehome Parks Act (MPA), HSC Sections 18200, et seq., and Title 25, CCR Sections 1000, et seq.”
    2 more reviewed findings on this topic
    • Limited — RV and trailer camping at Silver Strand State Beach Campground in the San Diego Coast District.
      “Camping Stay Limits: Applies to persons, equipment, or vehicles and any combination thereof [...] Maximum stay of 30 days per calendar year [...] Maximum 7 consecutive days during peak season (May 15 – September 15) [...] Maximum 14 consecutive days during non-peak season”
    • Limited — Occupancy and use of recreational vehicles in California special occupancy parks and designated RV sections of mobilehome parks.
      “Unless otherwise allowed by a local ordinance, RVs generally may be occupied only in mobilehome parks or special occupancy parks governed by the Mobilehome Parks Act”
  • county zoning authorityGeneral

    California county legislative bodies' authority to adopt zoning ordinances regulating buildings, structures, land uses, lots, yards, open space, lot coverage, intensity of use, parking, loading, and setbacks within county jurisdiction, including unincorporated areas.

    • The authority is exercised pursuant to Government Code Chapter 4, Zoning Regulations.
    • The statute separately authorizes city legislative bodies; incorporated municipalities may exercise their own zoning authority.
    • Government Code Section 65850 also lists authority to regulate signs and billboards, building and structure location, height, bulk, number of stories, and size, lot and open-space size and use, lot coverage, intensity of land use, offstreet parking and loading, and building setback lines.
    • The cited section states it was amended by Stats. 2017, Ch. 376, Sec. 1, effective January 1, 2018.
    “The legislative body of any county or city may, pursuant to this chapter, adopt ordinances that do any of the following:”
  • county building authorityGeneral

    California counties administering and enforcing state building standards through county building departments, including residential construction in unincorporated areas.

    • Each county must maintain building standards and state building regulations in the office of the building official responsible for administration and enforcement of state building standards.
    • The statewide Title 24 standards apply subject to statutory exceptions and any authorized local amendments or local requirements.
    • The cited HCD bulletin concerns the 2019 California Building Standards Code and its July 1, 2021 supplement; later code editions may supersede those particular edition dates.
    “These codes shall be maintained in the office of the building official responsible for the administration and enforcement of state building standards”

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Living off-grid in Marin County, California

Is Marin County a good place to live off-grid or homestead?

Marin County scores 42/100 on the Bolthole Index, a marginal county profile. Watch-outs: about 129,291 people within a 30-minute drive and elevated current hazard exposure.

Do you need a building permit in Marin County, California?

Marin County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Marin County Environmental Health Services (Community Development Agency). Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

Can you live in an RV or tiny home on your land in Marin County?

Living in an RV on your own land in Marin County is allowed on a temporary basis only: Occupancy of recreational vehicles as temporary emergency shelter in unincorporated Marin County during the County's shelter-crisis designation. The shelter-crisis designation was adopted at the Board of Supervisors' March 11, 2025 meeting and is in place for three years. The rule applies only in the unincorporated areas of Marin County. A tiny home is allowed. Confirm with the county before relying on it.

How much does land cost in Marin County, California?

Land in Marin County runs about $7,636 per acre, based on the latest county data.

What is the water situation in Marin County?

Marin County gets about 35.8" of rain a year, with severe drought in roughly 34.4% of years.

How remote is Marin County?

A representative private-land location has about 129,291 people within a 30-minute drive and 8,298,435 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

Off-grid gear

Going off-grid in Marin County means bringing your own water and power. The kit we’d start with:

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How Marin compares in California

Compare side-by-side →See all 58 California counties ranked →