Bolthole Index

Mariposa County, California

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

44Index Score / 100
#28 of 58 in California

Mariposa County, California requires building permits for new homes, remodels, conversions, manufactured-home installation and grading, subject to limited exemptions1. The county also has zoning, so a parcel's district and any applicable town or area plan shape what can be built2. Septic permits require County Health Department approval and are issued by the County Building Department3.

At a glance

Building permit
Required for homes and most construction; limited exemptions apply1
Zoning
Yes; check the parcel's district, map and applicable plan2
Septic
County Health approves systems; County Building issues the permit3
Wells
County Health permit required before well work begins4
RV living
Generally not permanent housing under state rules; ask Planning about parcel-specific options5
Tiny home
Must qualify and be approved under a recognized building or vehicle classification6
Owner-builder
Available with conditions, but permits and inspections still apply7
County-road access
Encroachment permit required for access from a county-maintained road8

Who to call

Building permits

Mariposa County Building Department

Building permits, plan review and inspections for structures, manufactured-home installation and grading

209-966-3934

[email protected]

5100 Bullion Street, P.O. Box 1268, Mariposa, CA 95338

Online permits →

Zoning

Mariposa County Planning Department

Zoning information, land-use review and development applications

209-966-5151

[email protected]

5100 Bullion Street, P.O. Box 2039, Mariposa, CA 95338

Online permits →

Septic permits

Mariposa County Environmental Health

Environmental Health review for septic systems and water wells

209-966-2220

[email protected]

5100 Bullion Street, Mariposa, CA 95338

Online permits →

Roads & driveways

Mariposa County Public Works Engineering Division

County-road engineering and encroachment permits

209-966-5356

4639 Ben Hur Road, Mariposa, CA 95338

Online permits →

Contact details are copied from each office’s official page and were checked against it on September 27, 2026.

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

Yes. Mariposa County requires permits for residential and commercial construction, including new construction, remodels, conversions, changes of occupancy, manufactured-home installation and grading1. The county issues permits under the current California Building Codes and local amendments, covering building, electrical, mechanical, plumbing, energy and accessibility requirements9. Limited exemptions include qualifying one-story detached accessory structures no larger than 120 square feet and fences no higher than 7 feet, but an accessory structure supplied with water or power still needs a permit1. A parcel with an existing code violation cannot move through a new permit or inspection unless the requested permit corrects that violation9. Permit fees vary by project, so request a project-specific estimate from the Building Department before finalizing a budget10.

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

The Mariposa County Building Department issues building permits and enforces structural-safety laws at 5100 Bullion Street, Mariposa; call 209-966-3934 or email [email protected]11. The county processes development permits online, while the department's front counter can assist applicants who need help12. For zoning and land-use questions, contact the Mariposa County Planning Department at the same street address by calling 209-966-5151 or emailing [email protected]13. Environmental Health reviews septic systems and wells at 5100 Bullion Street and can be reached at 209-966-2220 or [email protected]14. Public Works Engineering handles county-road encroachments at 4639 Ben Hur Road, Mariposa, and can be reached at 209-966-535615.

Does Mariposa County have zoning?

Yes. Mariposa County's Development Code is built around its zoning and subdivision ordinances, and the county is updating that code2. A parcel's zoning district, zoning map and any applicable specific or area plan determine its permitted uses and development standards16. Outside adopted Town Specific Plan areas, new homes are generally set back at least 25 feet from property lines and 55 feet from the centerline of public access roads or easements, while CAL FIRE applies a 30-foot property-line standard through the building-permit process17. Town Planning Area parcel-size standards vary with utilities, and the Mountain Home Zone applies a 5-acre minimum to parcels created through subdivision1819. We could not confirm a general county minimum home size, height limit or lot-coverage limit; ask Planning for the parcel-specific standards13.

How do septic and well permits work in Mariposa County?

A new or repaired onsite septic system needs a permit before work begins, and a project that also requires a building permit must obtain the septic permit before or at the same time as the building permit3. The County Health Department approves the system, while the County Building Department issues the installation permit3. Site conditions deserve early attention: USDA rates only 0.4% of Mariposa County soils as free of severe limitations for a conventional drain field, so allow time for evaluation and potentially a specially designed system20. Specially designed systems prompted by restrictive conditions place design, inspection and certification responsibility on the registered professional, with county preapproval, post-construction inspection and monitoring21. Wells also require a County Health Department permit before drilling, deepening, reconstructing or destroying begins, and construction work must use a licensed C-57 contractor4.

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

California does not treat an RV as a permanent dwelling, and RV occupancy is generally limited to mobilehome parks or special occupancy parks unless a local ordinance allows another arrangement5. Mariposa County has a documented temporary RV allowance for residents displaced by the Oak Fire while pursuing permanent housing, but that narrow program does not establish a general right to live in an RV on private land22. Ask the Planning Department about the parcel and intended duration before placing or occupying an RV13. A tiny home may be occupied only when it complies with and is approved under a recognized classification, such as a code-built home, manufactured home, factory-built home, RV, park trailer or camping cabin6. Mariposa County has not published a general county-specific tiny-home occupancy rule that we could confirm; Planning and Building should classify the proposed unit before purchase1311.

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

  1. Ask Planning to confirm the parcel's zoning district, allowed residential use, setbacks and any town or area plan1613.
  2. Resolve water and wastewater early: obtain Environmental Health review for a septic system and a county permit before well work begins34.
  3. If public water or sewer is available, contact Public Works Special Districts for hookup information instead of assuming an onsite system is allowed23.
  4. Ask Public Works for an encroachment permit when access is from a county-maintained road; the county requires the access to meet current standards8.
  5. Submit plans through the county's online Development Services Permit Center and request a project-specific fee estimate from Building1210.
  6. Complete required inspections and obtain all other agency signoffs before the Building Department's final inspection and certificate of occupancy24.

What should you check before buying land in Mariposa County?

Start with buildability, not the listing description: confirm zoning, legal access, setbacks, water and septic feasibility before closing16843. Terrain can materially affect site work because only 11.3% of Mariposa County land has a slope of 15% or less25. Conventional septic is another major constraint because only 0.4% of mapped soils avoid a severe drain-field limitation20. Water planning matters in a county averaging 31.4 inches of annual precipitation and experiencing severe drought in about 38.5% of recorded years2627. Roughly 52.9% of the county is federal land, and population density is about 11.7 people per square mile, so verify that the parcel has practical year-round access and reachable services2829. The effective property-tax rate is about 0.7%, with a median annual bill near $2,4373031.

Watch-outs

  • A parcel with an existing violation cannot receive a new permit, inspection or approval unless the requested permit corrects the violation9.
  • Only 0.4% of Mariposa County soils are rated free of severe limitations for a conventional septic drain field, so septic feasibility can change a project's cost and layout20.
  • We could not confirm a countywide floodplain-development permit rule; ask Planning and Building whether a parcel's mapped hazard area triggers additional review1311.

Sources

  1. Building Department, quoted and re-checked
  2. Mariposa County Planning Department, quoted and re-checked
  3. Mariposa County Sewage Disposal Rules, quoted and re-checked
  4. Well Ordinance, quoted and re-checked
  5. Information Bulletin 2016-01: Tiny Homes (California statewide rule), quoted and re-checked
  6. Information Bulletin 2016-01: Tiny Homes (California statewide rule), quoted and re-checked
  7. California Business and Professions Code section 7044, quoted and re-checked
  8. Engineering Frequently Asked Questions, quoted and re-checked
  9. Building Department, quoted and re-checked
  10. Approximate Fees, quoted and re-checked
  11. Mariposa County Building Department (mariposacounty.gov)
  12. Development Services Permitting Center, quoted and re-checked
  13. Mariposa County Planning Department (mariposacounty.gov)
  14. Mariposa County Environmental Health (mariposacounty.gov)
  15. Mariposa County Public Works Engineering Division (mariposacounty.gov)
  16. Mariposa County Planning Department, quoted and re-checked
  17. FAQs, quoted and re-checked
  18. FAQs, quoted and re-checked
  19. FAQs, quoted and re-checked
  20. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  21. Mariposa County Sewage Disposal Rules, quoted and re-checked
  22. Rebuilding/Reoccupying Your Property, quoted and re-checked
  23. Building a New Home, quoted and re-checked
  24. Building a New Home, quoted and re-checked
  25. Share of land at 15% slope or less: Bolthole Index county data
  26. Annual precipitation: Bolthole Index county data
  27. Share of years in severe drought: Bolthole Index county data
  28. Federal land share: Bolthole Index county data
  29. Population density: Bolthole Index county data
  30. Effective property tax rate: Bolthole Index county data
  31. Median property tax bill: Bolthole Index county data

Written September 27, 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

Mariposa County in California

44
County map
Mariposa County highlighted among the California counties · colored by Index score

How Mariposa County scores

Seclusion62100% ev.
Self-Sufficiency44100% ev.
Admin Boringness41100% ev.
Durability17100% ev.
Property Autonomy56100% ev.
Carry Cost70100% 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 →

$400kTypical home
0.7%Property tax
$4,306Land / acre
31.4"Annual rain
38.5% of yrsSevere drought
18.9 / yr (+12.9)Mid-century 100°F days
72.1 daysMid-century dry spell
2.35" (+3.9%)Mid-century 1-day rain
1.09×Wildfire change factor
100%Forward climate coverage
$2,285Home insurance / yr
8.8% / yrInsurance growth
5.88%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
11,893People within 30 min
2,748,804People within 2 hr
15,786Radius comparison (15 mi)
11.7People / sq mi
52.9%Federal land
11.3%Land at 15% slope or less
0.4%Septic soil without severe limits
2,616 acWorkable land screen
60.3%Wooded land
55.6 tonsBiomass / forest ac
55.7°FAvg temp

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Answers from the rulebook for Mariposa County

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

Mariposa County rules

  • Building permitRequired

    Residential and commercial building construction, including new construction, remodels, conversions, changes of occupancy, manufactured-home installation, and grading in Mariposa County.

    • Permit requirements are subject to the current California Building Codes and Mariposa County local amendments.
    • The county FAQ lists exemptions including certain one-story detached accessory structures not exceeding 120 square feet, fences not over 7 feet, certain retaining walls, limited water tanks, sidewalks and driveways, finish work, shallow prefabricated pools, playground equipment, certain window awnings, and limited decks.
    • Any accessory structure with water or power supplied requires a permit.
    • Remodeling that relocates or adds electrical, mechanical, or plumbing fixtures or changes the footprint or interior layout requires a permit.
    • Plumbing leak repairs become new work requiring a permit and inspection when concealed piping must be removed and replaced.
    • Emergency equipment replacements and repairs require the permit application by the next business day.
    • The exemptions do not authorize work violating the 2022 CRC or other applicable laws or ordinances.
    • Effective June 9, 2022, the department cannot accept a permit application, issue a permit, request or complete inspections, or give approvals for a parcel with an existing violation unless the requested permit corrects the violation.

    detached accessory structure floor area exemption threshold: <= 120 square feet (Does not apply to storm shelters; any structure with water or power supplied requires a permit.) · fence exemption height threshold: <= 7 feet · retaining wall exemption height threshold: <= 4 feet (Unless supporting a surcharge.)

    “As per Chapter 1, Scope and Application, Section R105 of the 2022 California Residential Building Code, the following activities and improvements are generally exempt from permit requirements.”
  • Building code adoptedAdopted (with conditions)

    Construction subject to Mariposa County building permitting and enforcement.

    • Building permits are issued under the current edition of the California Building Codes and local amendments.
    • The codes encompass building, electrical, mechanical, plumbing, state energy, and state accessibility requirements.
    • The Building Department states that the 2025 triennial edition of California Building Standards Code, Title 24, is available online.
    • If a violation exists on a parcel, the Building Department cannot accept a permit application, issue a permit, request or complete inspections, or give approvals unless the requested permit corrects the violation; the page states this restriction is effective June 9, 2022 under Ordinance 1173 adopted May 10, 2022.
    “Building permits are issued based on the current edition of the California Building Codes and local amendments, encompassing building, electrical, mechanical, plumbing, state energy requirements, and state accessibility laws.”
  • Certificate of occupancyRequired

    A completed permitted new residence in Mariposa County.

    • The Building Department must conduct the final inspection.
    • The project must be finalized by the Building Department before the certificate is issued.
    • Before scheduling the final, all other required agencies must have signed off.
    • The cited guide states that the certificate is issued to complete the project; it does not establish that every type of project or occupancy requires the same certificate procedure.
    “When your project is finalized by the Building Department, a Certificate of Occupancy will then be issued to complete the project.”
  • County-wide zoningPresent (with conditions)

    Mariposa County Title 17 zoning regulations and related county zoning amendments.

    • The county is currently updating its Development Code.
    • Specific requirements depend on the applicable zoning district, zoning map, and any applicable specific or area plan.
    “Mariposa County Title 17-Zoning Ordinance and Title 16 - Subdivision Ordinance make up the core of the "Development Code."”
  • Local zoningPresent (with conditions)

    Land use and development within Mariposa County areas governed by the county zoning ordinance.

    • Specific district standards, permitted uses, conditional uses, and zoning-map designations must be checked for the parcel.
    • The county Planning Department provides zoning information and application guidance.
    “Ordinance Titled "Amend the Mariposa County Zoning Map by Changing the Zoning of APN 006-150-003 from Rural Residential Zone to Yosemite West Mixed Use Zone"”
  • Zoning districtsPublished

    Zoning districts within the Mariposa Town Planning Area

    • The specific-plan zoning provisions apply to property within the Mariposa Town Planning Area, except lands excluded from county land-use regulations by federal statute or regulation.
    • Where the specific-plan standards conflict with other Title 17 standards, the specific-plan standards govern.
    • Where the specific plan is silent, Title 17 standards govern.
    • The zoning maps are maintained by the Mariposa County Planning Department and are available for public review and purchase.

    principal zone district: SFR-9K (Single family residential, 9,000 square feet) · principal zone district: SFR-1/2AC (Single family residential, 1/2 acre) · principal zone district: MFR (Multi-family residential) · principal zone district: PO (Professional office) · principal zone district: GC (General commercial) · principal zone district: LI (Light industrial) · principal zone district: P-Q (Public-quasi public) · principal zone district: SR (Scenic resource) · combining zone district: PUD (Planned unit development overlay) · combining zone district: DRO (Design review overlay) · combining zone district: HDRO (Historic design review overlay)

    “In order to regulate the use of land, buildings, and structures and establish minimum parcel sizes, the following principal zone districts and combining zone districts are established:”
  • Minimum lot sizeSpecified

    Residential development in Mariposa County Town Planning Area (TPA) designations.

    • The 2.5-acre standard applies with on-site water and wastewater.
    • The 1-acre standard applies with community water or wastewater.
    • The 9,000-square-foot standard applies with community water and wastewater.
    • The source describes these as TPA designation standards; parcel-specific zoning and development review still apply.

    minimum parcel size: 2.5 acres (with on-site water and wastewater) · minimum parcel size: 1 acre (with community water or wastewater) · minimum parcel size: 9000 square feet (with community water and wastewater)

    “The Town Planning Area (TPA) Designation allows for residential development at 2 1/2 acre minimum parcel size (with on-site water and wastewater); 1 acre minimum parcel size (with community water or wastewater); 9,000 square feet (with community water and wastewater). Additionally the TPA designation potentially allows for neighborhood and resort commercial uses with Planning Commission approval.”
    One more reviewed finding on this topic
    • Specified — Subdivision of property in the Mountain Home Zone in unincorporated Mariposa County.
      “No. A parcel created through the Subdivision process must comply with the minimum parcel size established by code. A 9.99 acre parcel does not comply with the 5 acre per parcel minimum size requirement for this zone.”
  • SetbacksSpecified

    New residential construction outside adopted Town Specific Plan areas in unincorporated Mariposa County.

    • Generally 25 feet from all property lines.
    • At least 55 feet from the center lines of public access roads or easements.
    • A 10% rule applies to small parcels less than 250 feet in length or width; the source directs applicants to check with a planner for details.
    • Inside adopted Town Specific Plan areas, the applicable setback depends on the town area.
    • State Fire Safe Regulations establish a 30-foot setback from property lines and are enforced by CAL FIRE through the Building Permit Process.

    setback from property lines: >= 25 feet (generally; outside adopted Town Specific Plan areas) · setback from center line of public access roads or easements: >= 55 feet (outside adopted Town Specific Plan areas) · small-parcel threshold: < 250 feet (10% rule applies; source says less than 250 feet in length or width) · State Fire Safe setback from property lines: 30 feet (enforced by CAL FIRE through the Building Permit Process)

    “Outside of adopted Town Specific Plan areas, new residential construction setbacks are generally 25 feet from all property lines and at least 55 feet from the center lines of public access roads or easements. There is a 10% rule which applies to small parcels (less than 250 feet in length or width). Please check with a planner for more details regarding this rule. Inside adopted Town Specific Plan areas, we would need to know which town area your parcel is located in. Have your APN or address available when you call. The State Fire Safe Regulations establish a 30 foot setback from property lines; however, this standard is enforced by California Department of Forestry & Fire Protection (CAL FIRE) through the Building Permit Process.”
  • Living in an RVTemporary only (with conditions)

    Temporary RV housing for Mariposa County residents who lost their homes due to the Oak Fire, on approved property while rebuilding or installing permanent housing.

    • Occupancy is temporary and limited to a maximum of five years.
    • The resident must have lost the home due to the Oak Fire.
    • For off-site housing, the RV must be placed on approved property in Mariposa County.
    • For on-site housing, the impacted site must first be cleared by the County.
    • Permanent housing must be pursued through rebuilding or installation.
    • The County page directs applicants to submit the Oak Fire temporary housing application and related forms.

    maximum RV occupancy period: 5 years (Oak Fire temporary housing only)

    “If you've lost your home due to the Oak Fire, it is possible to live temporarily in a Recreational Vehicle (RV) for a maximin of five (5) years while you are working with your insurance company and while you are rebuilding or installing a permanent residence.”
  • Accessory dwellingsAllowed (with conditions)

    Accessory dwelling units and junior accessory dwelling units in Mariposa County zones that allow residential or multifamily uses.

    • ADUs and JADUs are permitted in all zones that allow residential or multifamily uses.
    • Mariposa County states that it does not have its own ADU ordinance and defers to state law.
    • The County directs applicants to obtain a building permit through the County permitting system.
    • A JADU deed restriction must be completed, notarized, and recorded before issuance of the certificate of occupancy/final on the building permit.
    • ADUs must meet building code.
    “Accessory Dwelling Units (ADUs) and Junior Accessory Dwelling Units (JADUs) are a type of residential unit that is a considered an accessory use and permitted in all zones that allow for residential or multi-family uses.”
  • Who permits septicCounty

    On-site sewage disposal and septic-system administration in Mariposa County.

    • The sewage rules assign permit approval to the County Health Department and permit issuance to the County Building Department.
    • The County Environmental Health team states that it inspects, oversees, and monitors septic systems.
    “Our team of Specialists; inspect, oversee, and monitor regulated programs and facilities to ensure mandated compliance in the following: [...] Septic Systems”
  • Septic permitRequired

    Construction or repair of a new or existing on-site sewage disposal system in Mariposa County.

    • The permit must be obtained before initiation of construction or repair activities.
    • For a structure requiring on-site disposal facilities, the permit must be obtained before or concurrently with issuance of the building permit.
    • The permit is issued by the County Building Department with County Health Department approval.

    permit timing: before construction or repair begins; before or concurrent with a building permit when applicable

    “A sewage disposal system installation permit is required from the Mariposa County Building Department as approved by the County Health Department prior to the initiation of construction activities or repair activities associated with a new or an existing on-site sewage disposal system.”
  • Septic inspectionLimited

    Specially designed on-site sewage disposal systems, including systems required for commercial, industrial, or institutional facilities with flows exceeding 450 gallons per day and systems required because of restrictive site conditions.

    • Responsibility for design, inspection, and certification lies with the registered professional designing the system.
    • The County Health Department performs a preapproval site evaluation, post-construction inspection, and periodic monitoring.
    • The County Environmental Health Specialist may refuse permits or return plans for modification if the design would create a nuisance or unsanitary condition.
    • For specially designed systems, the designer must certify in writing that the system was installed consistently with approved plans; major deviations require new written approval before installation.

    special-system flow threshold: > 450 gallons/day (Commercial, industrial, and institutional facilities below or at this threshold are not covered by this stated trigger.)

    “Responsibility for design, inspection and certification lie solely with the registered professional designing the sewage disposal system. The County Health Department will, however, perform a preapproval site evaluation, a post construction inspection and will monitor the system periodically.”
  • Off-grid sanitationLimited

    Alternative non-discharge sanitation methods, including composting toilets and incinerating toilets, in Mariposa County.

    • Allowed as a convenience toilet connected with a non-residential secondary structure on owner-occupied property, such as a barn or workshop.
    • Allowed in owner-occupied residential structures served by a conventional or engineered and fully sized on-site sewage disposal system or a public sewer system.
    • Not allowed in connection with commercial buildings.
    • A Health Department permit is required before construction or installation.
    • Plans must be submitted to and approved by the County Environmental Health Specialist before construction or installation.
    • The system must be maintained in a safe and sanitary way; the Health Department may establish guidelines and may suspend or revoke the permit for violations.
    “Alternative non-discharge sewage disposal methods may be used only under the following circumstances: [...] A permit is required from the Health Department to construct or install an alternative non-discharge sewage disposal method.”
  • Well permitRequired

    Drilling, digging, boring, deepening, constructing, reconstructing, or destroying a well in Mariposa County.

    • Emergency repairs described in Section 13.16.110 may be performed without first applying for a permit, but the application must be completed by the end of the Health Department working day on the last day of the following week.
    • Applications must use the required form, include a required plot plan, and include the required filing fee.
    • A C-57 licensed contractor must perform construction, reconstruction, or destruction work.
    • The Health Department may condition, deny, suspend, or revoke permits.
    “Prior to drilling, digging, boring, deepening, or otherwise constructing, reconstructing or destroying any well, the property owner, his/her authorized agent, or the well contractor shall secure a permit from the county health department;”
  • Mandatory utility hookupWater and sewer (with conditions)

    New-home development where public water, public sewer, or both are available or intended, with district-specific hookup information handled by the relevant public works or utility district.

    • The County building handout directs applicants with public water, sewer, or both to contact Public Works Special Districts.
    • For a house within the Mariposa Public Utility District, the applicant must contact MPUD for water and sewer hookup information.
    • The source does not establish a countywide requirement that every parcel connect to both systems.
    “If you have public water, sewer or public water and sewer, you will need to get in contact with Public Works Special Districts at (209)966-5356.”
  • Driveway accessRequired

    Accessing property off a County-maintained road, and new structures or remodels on a parcel where county road access is implicated

    • An encroachment permit is required when accessing property off a County-maintained road or doing a new structure or remodel on a parcel.
    • The encroachment must be brought up to current standards.
    • The stated fee is $210.00 effective February 1, 2025.
    • Applications are obtained from the Mariposa County Public Works Administration office.

    encroachment permit fee: 210 USD (effective February 1, 2025)

    “Anytime you are accessing property off of a County maintained road (or doing a new structure or remodel on a parcel) an encroachment permit and bringing the encroachment up to current standards is required.”
  • Short-term rentalsLimited

    Bed-and-breakfasts and vacation rentals in Mariposa County zones

    • The County states that bed-and-breakfasts and vacation rentals are permitted in most zones, not necessarily every zone.
    • A Transient Occupancy Tax certificate is required.
    • An application and inspections are required to verify basic health and safety requirements.
    • Parcels served by Mariposa Public Utility District are subject to MPUD Ordinance #58.
    • The County publishes separate current standards by planning area, including Coulterville and all other countywide areas, Fish Camp, Mariposa Town, and Wawona.
    “Bed & Breakfasts and Vacation Rentals are permitted in most zones in Mariposa County. You must obtain a Transient Occupancy Tax certificate; an application and inspections are required to verify basic health and safety requirements.”
  • Permit feesVariable (with conditions)

    Mariposa County building permits and related county building fees

    • The Building Department states that fees are project-specific.
    • The page links an updated 2026 Mariposa County Building Department approved fee schedule.
    • An additional $4.00 state-required fee is collected on every permit issued.
    • California Title 24 valuation-based fees apply to covered disciplines for which a valuation is made.

    Certified Access Specialist Program fee: per 4 USD per permit · Title 24 valuation fee for valuation $1.00-$25,000: 1 USD (or fraction thereof) · Title 24 valuation fee for valuation $25,000.01-$50,000: 2 USD (or fraction thereof) · Title 24 valuation fee for valuation $50,000.01-$75,000: 3 USD (or fraction thereof) · Title 24 valuation fee for valuation $75,000.01-$100,000: 4 USD (or fraction thereof) · Title 24 valuation fee above $100,000: per 1 USD per additional $25,000.01 (or fraction thereof)

    “Please contact the Building Department for project-specific fees.”
  • Permit processPublished (with conditions)

    County development-related permits, including planning, environmental health, and building matters

    • All permits are processed online through the Development Services Permit Center.
    • Applicants may contact the county or visit the front counter for assistance.
    • The Planning Department handles land-use and property-development matters.
    • Environmental Health handles septic systems, wells, food facilities, pools, and related matters.
    • The Building Department handles new structures, renovations, conversions, and related matters.
    “Mariposa County now processes all permits online.”

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) — Owner-builders performing or arranging construction on their own property in California, including Mariposa County.
      “An owner who builds or improves a structure on his or her property, provided that both of the following conditions are met:”
    • 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”
  • InspectionsRequired

    Construction projects within HCAI jurisdiction involving California health facilities.

    • HCAI field personnel make periodic site visits.
    • The Inspector of Record is responsible for continuous inspection of the work.
    • The inspections address seismic, fire, life-safety, and other building-code requirements.
    “The approved IOR with the required personal knowledge performs only those duties associated with the required continuous inspections”
    One more reviewed finding on this topic
    • Required — California owner-builder projects addressed by the Contractors State License Board guidance.
      “Your project must pass codes and building inspections.”
  • Minimum dwelling sizeSpecified

    Efficiency units permitted by a California city, county, or city and county.

    • The local jurisdiction must adopt an ordinance permitting the efficiency unit.
    • Occupancy is limited to no more than two persons.
    • The unit may have partial kitchen or bathroom facilities as specified by the local ordinance.
    • All other applicable minimum standards under Health and Safety Code Part 1.5 continue to apply.

    minimum floor area: >= 150 square feet · maximum occupancy: <= 2 persons

    “Notwithstanding Sections 17922, 17958, and 17958.5, a city, county, or city and county may, by ordinance, permit efficiency units for occupancy by no more than two persons which have a minimum floor area of 150 square feet and which may also have partial kitchen or bathroom facilities, as specified by the ordinance.”
  • Camping on your landLimited

    Camping in units operated by the California Department of Parks and Recreation statewide.

    • Camping is confined to areas designated for that purpose.
    • Occupancy by the same persons, equipment, or vehicles is generally limited to 30 days in any calendar year in that unit.
    • The Department may establish shorter or longer occupancy limits.
    • When a shorter seasonal limit applies, the camper must vacate the campsite and may not reregister in the unit until 48 hours have expired, measured from 12:00 noon on the checkout day to 12:00 noon on the second day following.
    • A district superintendent may permit one-night camping in a day-use area or portion of one, subject to Department-established fees and vehicle limitations; occupants must vacate by 9:00 a.m. the following morning.
    • California State Parks' current reservation policy states that each campground has a consecutive-night limit, requires a 48-hour absence after that limit, and generally has a 30-night annual maximum, subject to individual park policies.

    general annual occupancy limit: 30 days per calendar year per unit (The Department may establish shorter or longer limits of occupancy.) · return interval after shorter seasonal limit: 48 hours (Measured from 12:00 noon of the checkout day to 12:00 noon of the second day following.) · one-night camping in day-use area: 1 night (Only if permitted by the district superintendent; occupants must vacate by 9:00 a.m. the following morning.)

    “Occupancy by the same persons, equipment, or vehicles of any camping facility is limited to a total of 30 days in any calendar year in that unit.”
    One more reviewed finding on this topic
    • Allowed (with conditions) — Temporary camping in California special occupancy parks, including parks containing recreational vehicles, tents, or camping cabins.
      ““Special occupancy park” means a recreational vehicle park, temporary recreational vehicle park, incidental camping area, or tent camp.”
  • Tiny homesAllowed (with conditions)

    Occupancy of a structure marketed or described as a tiny home in California.

    • The tiny home must comply with applicable standards and be approved as a HUD-Code manufactured home, California Residential or Building Code home, factory-built housing, recreational vehicle, park trailer, or camping cabin.
    • The location must be approved for the applicable classification.
    • A tiny home that does not fit one of those classifications and does not comply with the California Building Standards Code is a noncomplying structure whose occupancy is illegal.
    • Approving and enforcing agencies vary depending on whether the unit is inside or outside a mobilehome or special occupancy park.

    park trailer or RV gross area limit: <= 400 square feet (Applicable classification-specific exclusions and standards apply.)

    “In order to be occupied, a tiny home must comply with the standards of, and be approved as one of the following types of structures: a HUD-Code manufactured home (MH), California Residential Code or California Building Code home, factory-built housing (FBH), recreational vehicle (RV), park trailer (PT) or camping cabin (CC).”
  • Manufactured homesAllowed (with conditions)

    Occupancy of manufactured homes inside or outside mobilehome parks in California.

    • The manufactured home must satisfy applicable federal standards and California Manufactured Housing Act and Title 25 requirements.
    • Installation and approval for occupancy are governed by the Mobilehome Parks Act.
    • HCD or a local enforcement agency with assumed Mobilehome Parks Act authority is responsible for ensuring compliance with statutory construction and maintenance requirements.
    • Local agency approvals may be necessary for the project.

    minimum width for a new manufactured home: >= 8 body feet (The statutory definition also includes units at least 40 body feet in length.) · minimum erected floor area for a new manufactured home: >= 320 square feet

    “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.”
  • Subdividing landRegulated (with conditions)

    Division of land in California that falls within the statutory definition of subdivision, including division for sale, lease, or financing.

    • A parcel map is generally required unless a final or parcel map is otherwise required or the preparation is waived by local ordinance.
    • Local ordinances may require a tentative map and may establish additional area, improvement, design, drainage, road, sanitary-disposal, water-supply, environmental-protection, and related requirements.
    • Certain railroad-right-of-way and governmental or public-utility conveyances are excepted from the parcel-map requirement described in Government Code section 66428(a).
    “A parcel map shall be required for subdivisions as to which a final or parcel map is not otherwise required by this chapter, unless the preparation of the parcel map is waived by local ordinance as provided in this section.”
  • 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”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

  • Lot coverage — Maximum lot coverage in unincorporated Mariposa County.
  • Building height — Building-height limits in unincorporated Mariposa County.
  • Agricultural exemption — Potential agricultural-use exemption from county zoning, subdivision, or building-permit requirements in unincorporated Mariposa County.
  • Building in a floodplain — Development in mapped floodplain or flood hazard areas in Mariposa County

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 Mariposa County, California

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

Mariposa County scores 44/100 on the Bolthole Index, a marginal county profile. Its strengths: manageable long-term carry cost and sparse surroundings — about 11,893 people within a 30-minute drive. Watch-outs: elevated mid-century heat, water, rain, or wildfire exposure and more administrative friction around building and land use.

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

Mariposa County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Mariposa County Environmental Health Division (Health and Human Services). 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 Mariposa County?

Living in an RV on your own land in Mariposa County is allowed on a temporary basis only: Statewide rule. Occupancy of recreational vehicles as residential units in California. RVs are not intended for occupancy as permanent dwellings. Unless a local ordinance allows otherwise, RV occupancy generally is limited to mobilehome parks or special occupancy parks governed by the Mobilehome Parks Act or Special Occupancy Parks Act. A tiny home is allowed. Confirm with the county before relying on it.

How much does land cost in Mariposa County, California?

Land in Mariposa County runs about $4,306 per acre, based on the latest county data.

What is the water situation in Mariposa County?

Mariposa County gets about 31.4" of rain a year, with severe drought in roughly 38.5% of years.

How remote is Mariposa County?

A representative private-land location has about 11,893 people within a 30-minute drive and 2,748,804 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 Mariposa County means bringing your own water and power. The kit we’d start with:

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How Mariposa compares in California

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