Bolthole Index

Mono County, California

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

45Index Score / 100
#24 of 58 in California

Unincorporated Mono County, California requires building permits for new construction, remodeling, enlargement and some repairs or alterations1. The county also applies zoning and land-use rules throughout the unincorporated area2. Mono County Environmental Health issues onsite wastewater permits there3.

At a glance

Building permit
Required for new construction, remodeling, enlargement and some repairs or alterations in unincorporated Mono County1
Zoning
County land-use rules apply throughout unincorporated Mono County2
Septic permit
Required before constructing or altering an onsite wastewater system4
RV living
Temporary use is allowed only in defined circumstances; general long-term occupancy is not confirmed5
Tiny home
Must fit an approved state building or vehicle classification and be allowed at the location6
Owner-builder
A qualifying owner may claim California's contractor-license exemption, but permits and inspections still apply7
Well permit
Required for well construction, repair, modification or destruction8
Septic soils
Only 5.1% of soils lack severe limits for a conventional drain field9

Who to call

Building permits

Mono County Community Development Department - Building Division

Building permits, plan review and inspections in unincorporated Mono County

760-924-1800

[email protected]

1290 Tavern Road, Ste 138, Mammoth Lakes, CA 93546

Planning & zoning

Mono County Community Development Department - Planning Division

Zoning, land-use review and planning permits in unincorporated Mono County

760-924-1800

[email protected]

1290 Tavern Road, Ste 138, Mammoth Lakes, CA 93546

Septic permits

Mono County Environmental Health - Onsite Wastewater Treatment Systems (OWTS) Program

OWTS permits, greywater systems and septic-system review

760-924-1830

1290 Tavern Road, Mammoth Lakes, CA 93546

Roads & driveways

Mono County Public Works Department - Engineering Division

Road and driveway design standards, grading permits and county-road encroachment

760-932-5440

74 North School Street, PO Box 457, Bridgeport, CA 93517

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 Mono County, California?

Yes. Unincorporated Mono County requires permits for new construction, remodeling, renovation, enlargement and some repair or alteration work10. Cosmetic work such as painting, carpeting, wallpaper, cabinets and trim does not require a building permit1. The Mono County Building Division oversees and issues permits in the unincorporated county, but not inside the Town of Mammoth Lakes11. California's current statewide code cycle applies to buildings and structures whose permit applications were filed on or after January 1, 202612. A narrow county exemption exists for qualifying unoccupied agricultural shade-cloth or hoop-house structures without service systems, but zoning, setbacks and fire requirements still apply13.

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

For an unincorporated parcel, start with the Mono County Community Development Department's Building Division at 1290 Tavern Road, Ste 138, Mammoth Lakes, CA 93546; call 760-924-1800 or email [email protected]11. The same department's Planning Division handles land-use review and development policy questions at that address and contact14. Mono County recommends a preapplication conference for planning projects; after submittal, the county may accept an application as complete or request more information within 30 days, and some projects proceed through agency review, environmental review, public notice and a hearing15. The building-permit process includes examination of work during construction, although the reviewed county material does not provide a universal inspection-stage schedule16. Schedule inspections through the county hotline at 760-924-182711.

Does Mono County have zoning?

Yes. Development in unincorporated Mono County must follow the county's General Plan, Zoning Code, land-use designation and any applicable Area or Specific Plan2. The Town of Mammoth Lakes maintains separate zoning, so first confirm which jurisdiction contains the parcel17. An accessory dwelling unit may be allowed where a single-family residence is permitted or where a Specific Plan allows it, but size, review, setbacks, utilities and other standards determine the approval path18. Manufactured homes are permitted as residences in certain designations, while manufactured-housing subdivisions require a Use Permit and Tract Map in listed designations19. Short-term rentals require both a Use Permit and a Short-Term Rental Activity Permit in any county-administered land-use designation20. We could not confirm a general minimum dwelling size for unincorporated Mono County; ask Planning about the specific parcel and dwelling type14.

How do septic permits work in Mono County?

Mono County Environmental Health administers onsite wastewater systems in the unincorporated county3. A permit is required before constructing, reconstructing, repairing, modifying, destroying or abandoning an OWTS or graywater system, and final approval is required before the system is covered or used4. If a public sewer lies within 200 feet of a wastewater-producing structure, the county does not allow an OWTS and requires a sewer connection21. For a conventional system, the county calls for site evaluation, a typical percolation rate of 5–60 minutes per inch, a reserve area equal to 100% of the initial absorption field, slope under 30%, and specified water setbacks; alternative systems need professional design22. Only 5.1% of county soils lack severe limitations for a conventional drain field, so test the site before fixing the house location9. Schedule required installation inspections at least 2 working days ahead and before covering components23.

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

Unincorporated Mono County allows an RV on vacant land during construction of a main building for no more than 1 year unless the Director Review permit is renewed annually after notice to neighboring owners5. In designated hazard zones, temporary RV use may be allowed for no more than 6 months of each year during the authorized period with Director Review and approved sanitation; temporary agricultural RV use on parcels of at least 20 acres is exempt from Director Review5. These paths do not establish general permission for indefinite RV residence, so ask Planning about the parcel and intended use14. A tiny home must qualify under an approved state classification and be allowed at the location6. A manufactured home used as a residence is permitted in certain county land-use designations, subject to the applicable criteria19.

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

  1. Confirm that the parcel is in unincorporated Mono County rather than the Town of Mammoth Lakes11.
  1. Ask Planning to verify the land-use designation, dwelling type, setbacks and required approvals; Mono County recommends a preapplication conference1514.
  1. Secure water and wastewater approvals. A Mono County permit is required for well construction, repair, modification or destruction8. Obtain the OWTS permit before septic construction4.
  1. Resolve access. A driveway along a county-maintained road generally requires an encroachment permit, while a state-highway connection goes through Caltrans2425.
  1. Submit the building-permit package to the Building Division10.
  1. If acting as owner-builder, complete the declaration; the exemption concerns contractor licensing and does not remove permit or inspection requirements7.
  1. Schedule building inspections through the hotline and arrange septic inspection before components are covered1123.

What should you check before buying land in Mono County?

Start with jurisdiction, zoning, legal access, water and wastewater feasibility. A private well requires a Mono County permit, while septic layout can be difficult because only 5.1% of county soils lack severe limitations for a conventional drain field89. Terrain also matters: 30.8% of Mono County land has a slope of 15% or less, and 90.3% of the county is federally owned, so confirm that the advertised parcel is private and that its usable area can hold the house, access and reserve septic field2627. Mono County averages 15.2 inches of precipitation a year, and severe drought occurs in about 42.4% of years, making documented water supply more valuable than assumptions based on nearby wells2829. Check mapped flood hazards with the county before closing because we could not confirm the county's operative floodplain-development requirements.

Watch-outs

  • Mono County does not issue building permits inside the Town of Mammoth Lakes; town parcels use the town's permitting authority11.
  • A county OWTS is not allowed when a public sewer is within 200 feet of a wastewater-producing structure; connection to that sewer is required21.
  • A residential driveway along a county-maintained road requires an encroachment permit, and most new roads or driveways also require grading review2430.
  • We could not confirm the county's floodplain-development permit rule; ask Mono County Planning to check the parcel before purchase14.

Sources

  1. Building, quoted and re-checked
  2. General Plan, quoted and re-checked
  3. Onsite Wastewater Treatment Systems (OWTS), quoted and re-checked
  4. Mono County OWTS Ordinance, quoted and re-checked
  5. Mono County General Plan — Land Use Element (2025), 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. Well Permit Application, quoted and re-checked
  9. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  10. Building, quoted and re-checked
  11. Mono County Community Development Department - Building Division (monocounty.ca.gov)
  12. Approved Building Standards (California statewide rule), quoted and re-checked
  13. Policy and Procedure for Unoccupied Agriculture Buildings, quoted and re-checked
  14. Mono County Community Development Department - Planning Division (monocounty.ca.gov)
  15. Planning Permit Process, quoted and re-checked
  16. Building, quoted and re-checked
  17. All Layers and Tables (OpenData/Planning), quoted and re-checked
  18. Mono County General Plan Land Use Element – 2025, quoted and re-checked
  19. Mono County General Plan Land Use Element – 2025, quoted and re-checked
  20. Short-Term Rentals, quoted and re-checked
  21. Mono County OWTS Ordinance, quoted and re-checked
  22. Onsite Wastewater Treatment Systems (OWTS), quoted and re-checked
  23. Mono County OWTS Ordinance, quoted and re-checked
  24. Encroachment Permit Package, quoted and re-checked
  25. Encroachment Permits | Caltrans (California statewide rule), quoted and re-checked
  26. Share of land at 15% slope or less: Bolthole Index county data
  27. Federal land share: Bolthole Index county data
  28. Annual precipitation: Bolthole Index county data
  29. Share of years in severe drought: Bolthole Index county data
  30. Mono County Public Works Department - Engineering Division (monocounty.ca.gov)

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

Mono County in California

45
County map
Mono County highlighted among the California counties · colored by Index score

How Mono County scores

Seclusion82100% ev.
Self-Sufficiency28100% ev.
Admin Boringness40100% ev.
Durability25100% ev.
Property Autonomy56100% ev.
Carry Cost66100% 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 →

$765kTypical home
0.8%Property tax
$3,138Land / acre
15.2"Annual rain
42.4% of yrsSevere drought
1.3 / yr (+1.2)Mid-century 100°F days
39.4 daysMid-century dry spell
1.85" (+5.4%)Mid-century 1-day rain
1.1×Wildfire change factor
100%Forward climate coverage
$1,925Home insurance / yr
6% / yrInsurance growth
1.85%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
1,228Radius comparison (15 mi)
4.3People / sq mi
90.3%Federal land
30.8%Land at 15% slope or less
5.1%Septic soil without severe limits
90,199 acWorkable land screen
25.4%Wooded land
23.6 tonsBiomass / forest ac
44.7°FAvg temp

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Answers from the rulebook for Mono County

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

Mono County rules

  • Building permitRequired

    New construction, remodeling, renovation, enlargement, and some repair work or alterations to existing buildings in unincorporated Mono County.

    • The Mono County Building Division does not oversee or permit work within the Town of Mammoth Lakes.
    • Cosmetic projects such as painting, carpeting, adding new wallpaper, cabinets, and trim work do not require a building permit.
    • The county page does not specify every Title 24 exemption or exception; project-specific requirements should be confirmed with the Building Division.
    “Permits are required when there is new construction to a building as well as some repair work or alterations to an existing structure.”
    One more reviewed finding on this topic
    • Required — New construction, remodeling, renovation, enlargement, and some repair or alteration work on buildings in unincorporated Mono County.
      “Permits are required when there is new construction to a building as well as some repair work or alterations to an existing structure.”
  • InspectionsLimited

    Construction work subject to the Mono County building-permit process in unincorporated Mono County.

    • Mono County states that the building-permit process provides the ability to investigate and examine work during construction.
    • The reviewed official county page does not enumerate inspection stages, scheduling deadlines, or trade-specific inspection requirements.
    • The Town of Mammoth Lakes is outside the Mono County Building Division's permitting oversight.
    “The building permit process provides a system to verify that plans comply with codes and the ability to investigate and examine work during construction.”
    One more reviewed finding on this topic
    • Limited — Work performed under a Mono County building permit in unincorporated Mono County.
      “The signature on this document authorizes representatives of Mono County to enter the property noted on the issued building permit for inspection purposes”
  • County-wide zoningPresent

    Mono County zoning and land-use regulation in the unincorporated area.

    • The General Plan and Zoning Code are combined into one document.
    • Each parcel in the unincorporated area is assigned a land-use designation.
    • Development or use must comply with the assigned designation and applicable Land Development Regulations.
    • State and federal preemption and other applicable permits may apply.
    “Except where preempted by applicable state or federal laws, these regulations (along with other applicable provisions of this General Plan, including but not limited to the Land Use Maps incorporated herein, see https://monomammoth.maps.arcgis.com) shall apply to all land in the unincorporated area of the county. Such land may only be developed or otherwise used in a manner consistent and compliant with these regulations and any other applicable provisions of this General Plan.”
  • Local zoningVaries (with conditions)

    Countywide aggregate of local zoning and land-use controls in Mono County; the county aggregate includes county-administered planning controls and separate Town of Mammoth Lakes zoning.

    • This is an aggregate county claim and does not attribute the Town of Mammoth Lakes zoning blocks to Mono County.
    • The Mono County GIS source states that adopted specific plans apply to defined geographic regions.
    • The Town of Mammoth Lakes has separately defined zoning blocks, including Airport, Downtown, Industrial, Residential Multi-Family, Resort, and other districts.
    “This dataset depicts zoning blocks defined by the Town of Mammoth Lakes, CA.”
    One more reviewed finding on this topic
    • Present (with conditions) — Land-use and zoning regulation in Mono County's unincorporated area.
      “Mono County is unique in that the General Plan and Zoning Code have been combined into one document. [...] in the unincorporated area of the county.”
  • Minimum lot sizeDistrict specific (with conditions)

    New parcels and development in unincorporated Mono County; minimum lot area varies by land-use designation and may be superseded or increased by onsite-wastewater and water-supply requirements.

    • No new parcel may be created below the minimum lot area required for its land-use designation.
    • Lots with individual OWTS served by a public water system generally require 15,000 square feet; a separate dedicated remote leach field may allow a smaller lot.
    • Lots with both an individual OWTS and an individual water-supply well generally require 40,000 square feet, or the amount required by the Lahontan Basin Plan or an approved LAMP.
    • Cluster subdivisions or similar developments not served by public sewer may reduce individual lot sizes if gross subdivision density is not increased and all health requirements are met.
    • Twin Lakes currently exceeds the allowed OWTS density, and no additional systems can be permitted there regardless of parcel size.

    minimum lot size with individual OWTS and public water system: 15000 square feet (A separate parcel dedicated to a centralized leach field or treatment may allow a smaller lot.) · minimum lot size with individual OWTS and individual water well: 40000 square feet (Subject to the Lahontan Basin Plan or an approved LAMP.)

    “minimum lot area required for the designation”
  • SetbacksSpecified

    New construction subject to the State Minimum Fire Safe Regulations in unincorporated Mono County.

    • The Board of Forestry and Fire Protection approved comprehensive MFSR updates on January 31, 2023.
    • The updated regulations supersede Mono County's regulations.
    • The 30-foot requirement applies regardless of land-use designation and parcel size unless criteria for deviation can be met under Article 5 of the MFSR.
    • Emergency water standards required by the Mono County General Plan for the Long Valley and Wheeler Crest Fire Protection Districts remain in effect.
    • The county directs applicants to consult the current California Code of Regulations version of the MFSR.

    minimum setback: 30 feet (Unless criteria for deviation can be met in Article 5 of the MFSR)

    “noteworthy changes include 30' setback requirements for all parcels regardless of land use designation and parcel size (unless certain criteria can be met for deviation”
  • Living in an RVTemporary only (with conditions)

    Placement and use of recreational vehicles on vacant or undeveloped private property in Mono County's unincorporated area, including use during construction of a main building and long-term temporary use in designated hazard zones.

    • RV placement and use during construction of a main building is limited to a short duration and may not exceed one year unless the Director Review permit is renewed annually after notice to contiguous property owners.
    • Long-term temporary use as a primary use in designated hazard zones may not exceed six months of each year for a five-year period and requires a Director Review permit.
    • Environmental Health must review and approve sanitation methods for the temporary use.
    • The applicant must obtain a building permit for the main building, if applicable, before RV placement.
    • The applicant must obtain necessary permits for the RV use, such as a building permit for an electrical hookup.
    • The RV must be removed when the Director Review expires.
    • The RV must be placed to minimize visual impacts to scenic highways and nearby properties.
    • A Director Review permit cannot be granted if the proposed use conflicts with local CC&Rs or applicable area or specific plans.
    • Temporary agricultural-related RV use on a parcel of 20 acres or larger is exempt from Director Review.

    maximum duration during main-building construction: <= 1 year (unless the Director Review permit is renewed annually following notice to contiguous property owners) · maximum long-term temporary use: <= 6 months per year (for a five-year period in designated hazard zones) · minimum parcel size for agricultural-related exemption: >= 20 acres (temporary agricultural-related RV use is exempt from Director Review)

    “Long-term temporary use of an RV – not to exceed six months of each year for a five-year period – may be permitted”
  • Manufactured homesLimited

    Manufactured or mobile homes used as residences in unincorporated Mono County, including Rural Mobile Home and Rural Residential land-use designations and manufactured-housing subdivisions.

    • In the Rural Mobile Home designation, a mobile home used as a single-family dwelling is a permitted use.
    • In the Rural Residential designation, a manufactured home used as a single-family dwelling is a permitted use, subject to the stated age and Section 04.280 criteria.
    • When there are two mobile homes on the same parcel, they must comply with the ADU requirements or with state mobile-home-park standards and obtain a county Use Permit.
    • Manufactured-housing subdivisions may be allowed only with a Use Permit and Tract Map application in ER, MU, MFR, RMH, RR, and SFR designations.
    • Manufactured-housing subdivisions have density, lot-area, district-area, lot-width, setback, access, and lot-coverage standards.

    manufactured-housing subdivision maximum density: <= 6 housing lots per acre (For a single home on each housing lot.) · manufactured-housing subdivision minimum lot area per home: >= 4000 square feet · manufactured-housing subdivision minimum area: >= 5 acres (Minimum subdivision lot width is 250 feet.) · manufactured-housing subdivision minimum lot width: >= 50 feet (Minimum lot depth is 80 feet.) · manufactured-housing subdivision maximum lot coverage: <= 75 percent (Includes housing unit, accessory structures, paved drives, and parking.)

    “Manufactured housing subdivisions may be allowed, subject to a use permit and Tract Map application in the following land use designations: ER, MU, MFR, RMH, RR and SFR.”
  • Accessory dwellingsAllowed (with conditions)

    Accessory dwelling units in unincorporated Mono County land-use designations that allow single-family residences or in Specific Plan areas where allowed.

    • An ADU may be permitted in any land-use designation that allows single-family residences as a permitted use or as allowed in Specific Plan areas.
    • Detached one-bedroom units not exceeding 850 square feet and two-bedroom units not exceeding 1,000 square feet may proceed with a building permit, subject to four-foot side and rear setbacks and health and safety standards including prevention of snow shedding onto adjacent properties.
    • Units that do not qualify for ministerial approval may require Director Review or a Use Permit: one-bedroom units between 850 and 1,400 square feet require Director Review; two-bedroom units between 1,000 and 1,400 square feet require Director Review; units exceeding 1,400 square feet require a Use Permit.
    • Construction must conform to applicable height, setback, lot coverage, fee, snow-storage, and other residential development requirements.
    • A well or septic-served ADU requires an Environmental Health clearance letter with the building permit, Director Review, or Use Permit application; public water or sewer service requires a letter from the serving entity indicating adequate service.
    • For units that do not qualify under Section 16.040.A, one unit on the property must be owner occupied; detached ADUs qualifying under Section 16.040.A have no owner-occupancy requirement.
    • Required parking is one space for a one-bedroom unit and two spaces for units with two or more bedrooms; studios have no parking requirement, and listed exceptions eliminate parking standards.
    • Short-term rentals are prohibited in all accessory dwelling units.

    junior accessory dwelling unit maximum size: <= 500 square feet (Must be contained entirely within an existing single-family structure and contain cooking facilities.) · detached one-bedroom ADU ministerial maximum size: <= 850 square feet (Four-foot side and rear yard setbacks and health and safety standards apply.) · detached two-bedroom ADU ministerial maximum size: <= 1000 square feet (Four-foot side and rear yard setbacks and health and safety standards apply.) · ministerial review deadline: 60 days (Unless the ADU is built concurrently with the primary unit.) · development impact fee exemption threshold: < 750 square feet (All ADUs are exempt from Housing Mitigation Ordinance fees.)

    “An Accessory Dwelling Unit and Junior Accessory Dwelling Unit may be permitted in any land use designation that allows single-family residences as a permitted use or as allowed in Specific Plan (SP) areas subject to the General Provisions below.”
  • Who permits septicCounty (with conditions)

    Onsite wastewater treatment systems in the unincorporated area of Mono County.

    • The Mono County OWTS program reviews and issues permits and regulates greywater systems.
    • The ordinance states that enforcement is within the unincorporated area of Mono County.
    • The Regional Water Quality Control Board-approved LAMP and California Plumbing Code also apply.
    “Within the unincorporated area of Mono County, the Administrative Authority is authorized and directed to enforce the provisions of this chapter.”
  • Septic permitRequired

    Construction or installation of on-site sewage treatment and disposal systems in Mono County.

    • Mono County reviews and issues permits for on-site sewage systems.
    • Permits must be issued before construction begins.
    • The applicant must submit an application, permit fee, plot plan, and site location map.
    • Site evaluation and inspection of test trenches and percolation tests are required before permit issuance when applicable; requirements may be waived in some areas or increased in others.
    • If a conventional system is unsuitable, an alternative system may be considered and must be designed by a registered civil engineer, registered engineering geologist, or registered environmental health specialist and comply with Mono County Health Department requirements.
    • Commercial systems require design by an appropriately licensed professional, soil testing by an appropriately licensed geologist or soil scientist, and Mono County Health Department verification.
    • Seepage pits and cesspools are prohibited in Mono County.
    • The construction guide specifies minimum setbacks of 100 feet from water supply wells to septic tanks and leach lines, 100 feet from perennial streams and springs to septic tanks and leach lines, and 200 feet from lakes or reservoirs to leach lines; special conditions apply where private wells and springs are used for domestic water supply.

    percolation rate: 5-60 minutes per inch (The construction guide states that gravel/coarse sand with a rate under 1 minute per inch is not suitable and gives additional soil-specific criteria.) · reserve repair/replacement area: 100 percent of initial absorption-field area · natural slope in absorption field: < 30 percent · lake or reservoir setback to leach lines: >= 200 feet · perennial stream or spring setback to septic tank and leach lines: >= 100 feet · water supply well setback to septic tank and leach lines: >= 100 feet

    “Permits must be issued before construction begins.”
    One more reviewed finding on this topic
    • Required — Constructing, reconstructing, repairing, modifying, destroying, abandoning, covering, concealing, or putting an OWTS or graywater system into use in unincorporated Mono County.
      “No person shall construct, reconstruct, repair, modify, destroy, or abandon any OWTS or graywater system, or any portion thereof, without having first obtained a permit from the Administrative Authority.”
  • Septic inspectionRequired

    OWTS construction and installation in unincorporated Mono County.

    • Inspections must be scheduled at least two working days in advance.
    • Inspection is required before final covering of system components.
    • A qualified professional may conduct construction inspections after excavation and before rock or fill placement with Administrative Authority approval.
    • Before final approval, a signed report confirming installation according to the approved design must be submitted.
    • Additional testing is required if the system is installed outside the permitted or approved area.

    inspection scheduling lead time: >= 2 working days

    “Inspections shall be scheduled with the Administrative Authority a minimum of two working days in advance of the time requested. Inspections are required prior to final covering of any components of a system.”
  • Off-grid sanitationProhibited

    Seepage pits and cesspools used for wastewater disposal anywhere in Mono County.

    “Seepage pits and cesspools are prohibited in Mono County.”
  • Well permitRequired

    Construction, repair, modification, or destruction of a well under the Mono County Health Department well-permit process.

    • The application requires an applicable permit fee and complete site plan showing the well location.
    • The applicant agrees to comply with Mono County and California well-construction laws and to submit a complete Well Completion Report immediately upon completion.
    • The permit is valid for twelve months from its date of issue.
    • The application becomes a permit when signed by the Environmental Health Specialist.

    permit validity: 12 months from date of issue

    “(WHEN SIGNED BY THE ENVIRONMENTAL HEALTH SPECIALIST, THIS APPLICATION IS A PERMIT)”
  • Mandatory utility hookupConditional

    Wastewater treatment for structures producing wastewater in unincorporated Mono County.

    • Wastewater must be handled by an approved OWTS or connection to a public sewer.
    • When a public sewer exists within 200 feet, an OWTS is not permitted and the structure must connect to the public sewer system.
    • Chemical toilets may be used only temporarily or occasionally.
    • The quoted ordinance provision is limited by the ordinance's unincorporated-area enforcement scope.

    public sewer proximity threshold: <= 200 feet (If a public sewer exists within this distance, connection is required and an OWTS is not permitted.)

    “When a public sewer exists within 200 feet of a structure that produces wastewater, an OWTS will not be permitted and the structure must connect to the public sewer system.”
  • Agricultural exemptionAvailable (with conditions)

    Unoccupied shade-cloth or hoop-house structures constructed for nursery or agricultural purposes under the Mono County Building Division policy.

    • The exemption does not include service systems.
    • The structure must be a one-story, unoccupied building used exclusively for growing and storage of food, herbs, ornamental crops, or cannabis.
    • It must have an emergency escape opening on one or more sides, be readily removable for seasonal variations, use somewhat flexible material, and have a cloth-type or similar membrane no thicker than six mil.
    • Permanent or temporary electrical, plumbing, gas, or mechanical systems and permanent foundation or anchoring systems are not allowed without a building permit.
    • The structure must maintain Mono County General Plan standards and minimum Mono County setback requirements, plus applicable requirements of the local fire protection district or Cal Fire.
    • This exemption does not authorize work violating the building code or other laws or ordinances.

    maximum membrane thickness: <= 6 mil (The policy states the covering is not exceeding six mil (1/1000 inch).)

    “Permits shall not be required for the following: Shade-cloth and/or hoop-house structures constructed for nursery or agricultural purposes, not including service systems.”
  • Subdividing landRegulated (with conditions)

    Land divisions and parcel maps in Mono County administered through the County Planning Commission.

    • The county describes a parcel map or land division as division of real property shown on the latest assessment roll for sale, lease, or financing into four or fewer parcels.
    • The Planning Commission reviews and makes determinations on tentative parcel maps and land divisions.
    • A public hearing is conducted to receive input and comment.
    • The Planning Commission sets conditions or standards, makes required findings, and approves the tentative map.
    • After the applicant complies with all tentative-map conditions, the final map is brought before the Planning Commission for approval.
    • The county states that the average processing time for a land-division project is six to nine months.
    • The county Building Division does not oversee or permit work within the Town of Mammoth Lakes.

    parcels: <= 4 parcels (the county page's definition applies to a parcel map or land division for sale, lease, or financing) · average processing time: 6-9 months

    “A land division or parcel map is the division of any real property, improved or not, shown on the latest assessment roll, for the purpose of sale, lease or financing into four or fewer parcels. The Planning Commission reviews and makes determinations on tentative parcel maps/land division.”
    2 more reviewed findings on this topic
    • Regulated (with conditions) — Land divisions and parcel maps in unincorporated Mono County, including divisions for sale, lease, or financing into four or fewer parcels.
      “for the purpose of sale, lease or financing into four or fewer parcels. The Planning Commission reviews and makes determinations on tentative parcel maps/land division.”
    • Regulated (with conditions) — Tract-map and parcel-map subdivision review in unincorporated Mono County.
      “The County Surveyor is responsible for review and approval of subdivision maps (Tract Maps and Parcel Maps) in the unincorporated areas of Mono County.”
  • Driveway accessLimited

    Residential driveway construction along county-maintained roads and development of roads or driveways in unincorporated Mono County.

    • Encroachment permits are typically required for residential driveway construction along county-maintained roads.
    • In most cases, a grading permit is required for building a road or driveway.
    • Work within a County right-of-way or County road requires authorization through an encroachment permit.
    • The encroachment permit requires a staff-time deposit and a security deposit; the security deposit may be higher depending on the work and is refundable if final inspection finds no road damage.

    encroachment permit deposit: 528 USD (as of July 2023; based on $132/hour capped at 4 hours per residential unit) · security deposit: >= 500 USD (for most permits; may be higher depending on the work)

    “Typically encroachment permits are required for residential driveway construction along county maintained roads.”
  • Short-term rentalsLimited

    Short-term rentals in Mono County land use designations administered by the County.

    • The Mono County Board of Supervisors adopted new short-term-rental policies and regulations on December 9, 2025.
    • A Use Permit and a Short-Term Rental Activity Permit are required in any land use designation.
    • The County page provides application, inspection, and code-compliance materials.

    required approvals: Use Permit and Short-Term Rental Activity Permit

    “Short-term rentals in any land use designation require a Use Permit and a Short-Term Rental Activity Permit.”
  • Permit feesPublished

    County permit fee schedules applicable to unincorporated Mono County permits.

    • The FY 2025-26 fee listing is effective July 1, 2025.
    • Solid waste fee changes were pending when the page was retrieved.
    • The page states that the displayed schedule reflected FY 2024-25 fees.
    • Public health fees were being calculated and were to be added upon completion.

    fee schedule effective date: 2025-07-01

    “The fee listing noted below for FY 2025-26, effective July 1, 2025 [...] The schedule below reflects fees from FY 2024-25.”
  • Permit processPublished (with conditions)

    County planning permit process for projects in unincorporated Mono County.

    • A preapplication conference with County staff is recommended.
    • An application may be accepted as complete or additional information may be required within 30 days of submittal.
    • Complete applications are reviewed by local, state, and federal agencies and the LDTAC.
    • CEQA review, staff analysis, public noticing, and a Planning Commission hearing may apply.
    • Appeals to the Board of Supervisors require a completed appeal application and accompanying fees within 10 days of the decision date.
    • The Town of Mammoth Lakes is a separate permitting authority.

    completeness review response period: 30 days · appeal filing period: 10 days (from the decision date)

    “Application will be accepted as complete or additional information will be required within 30 days of submittal.”

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”
    5 more reviewed findings on this topic
    • Available (with conditions) — An owner building or improving a structure on the owner's property, including an owner-builder project in Mono County, when the statutory conditions are met.
      “(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, provided that both of the following conditions are met: (A) None of the improvements are intended or offered for sale. (B) The property owner personally performs all of the work or any work not performed by the owner is performed by the owner’s employees with wages as their sole compensation.”
    • Available (with conditions) — An owner building or improving a structure on the owner's property, or a homeowner improving a principal residence or appurtenances, subject to California Business and Professions Code section 7044.
      “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 property owners who construct, alter, repair, improve, or remodel a building or structure, including projects in Mono County, subject to the stated owner-builder limitations.
      “An owner-builder is exempt from licensure, but there are limitations.”
    • 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”
  • Building code adoptedAdopted (with conditions)

    California Building Standards Code, California Code of Regulations, Title 24, including the 2025 California Building Code and related parts, for buildings and structures subject to the state code.

    • The 2025 California Building Standards Code applies to buildings and structures with a permit application date on or after January 1, 2026.
    • The applicable local building department or enforcing agency determines how the permit application date is established in a specific jurisdiction.
    • The code includes multiple parts, including the California Building Code, California Residential Code, Existing Building Code, Electrical Code, Mechanical Code, Plumbing Code, Energy Code, Wildland-Urban Interface Code, Fire Code, and Green Building Standards Code.

    effective date: 2026-01-01 · permit application date: >= 2026-01-01

    “The 2025 California Building Standards Code (CBSC), California Code of Regulations (CCR), title 24, will become effective on January 1, 2026, as a result of the 2024 Triennial Code Adoption Cycle. [...] The 2025 CBSC applies to all buildings and structures with a permit application date on or after January 1, 2026.”
    One more reviewed finding on this topic
    • Adopted — California statewide building standards, including residential construction subject to Title 24 of the California Code of Regulations.
      “Except as otherwise specifically provided by law, the building standards adopted and submitted by the department for approval [...] shall be adopted by reference”
  • 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.”
  • Zoning districtsPartial

    California city and county zoning codes and the zoning districts established by those local jurisdictions.

    • The city or county zoning code implements general-plan policies at the individual-parcel level.
    • Local zoning codes identify allowed land uses in the jurisdiction’s zoning districts.
    • Since 1971, state law requires city or county zoning codes to be consistent with the jurisdiction’s general plan, except in charter cities.
    • The source does not publish a statewide list of parcel-specific zoning districts; the applicable local jurisdiction must be consulted.
    “The zoning code presents standards for different land uses and identifies which land uses [...] are allowed in the various zoning districts of the jurisdiction.”
  • 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).”
  • 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 for development in unincorporated Mono County.
  • Building height — Maximum building height for development in unincorporated Mono County.
  • Building in a floodplain — Development in Mono County special flood hazard areas.

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 Mono County, California

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

Mono County scores 45/100 on the Bolthole Index, a marginal county profile. Its strengths: sparse surroundings — about 1,228 people within 15 miles and manageable long-term carry cost. Watch-outs: elevated current hazard exposure and thin water margin (15.2″/yr rainfall).

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

Mono County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Mono County Environmental Health (under Lahontan Regional Water Quality Control Board OWTS policy). 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 Mono County?

Living in an RV on your own land in Mono County is allowed on a temporary basis only: Placement and use of recreational vehicles on vacant or undeveloped private property in Mono County's unincorporated area, including use during construction of a main building and long-term temporary use in designated hazard zones. RV placement and use during construction of a main building is limited to a short duration and may not exceed one year unless the Director Review permit is renewed annually after notice to contiguous property owners. Long-term temporary use as a primary use in designated hazard zones may not exceed six months of each year for a five-year period and requires a Director Review permit. A tiny home is allowed. Confirm with the county before relying on it.

How much does land cost in Mono County, California?

Land in Mono County runs about $3,138 per acre, based on the latest county data.

What is the water situation in Mono County?

Mono County gets about 15.2" of rain a year, with severe drought in roughly 42.4% of years.

How remote is Mono County?

A typical private-land location has about 1,228 people within 15 miles and 1,802,530 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

Off-grid gear

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

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How Mono compares in California

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