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

Yes. Alpine County generally requires permits for improvements, replacements and repairs, and requires a separate permit before a building or structure is erected, enlarged, altered, repaired, moved, improved, removed, converted or demolished¹. The county identifies new attached or detached structures larger than 120 square feet, carports, garages, barns and grading of at least 50 cubic yards among work requiring permits and inspections; setbacks still apply when work is permit-exempt¹.

Alpine County has adopted and enforces the California Building Standards Code in Title 24, including applicable local amendments for buildings in flood hazard areas⁶. Building Safety reviews plans before permit issuance and periodically inspects permitted work¹. Property owners may receive permits as owner-builders, but they accept responsibility for the work and worker safety and must follow the county's residence, labor and resale conditions¹. Owner-builder status does not eliminate building-permit or inspection requirements¹.

The Alpine County Building Safety Division accepts building applications through the county's online portal, reviews plans and periodically inspects permitted work^1,8. The office is at 50 Diamond Valley Rd in Markleeville and can be reached at 530-694-2140¹.

The applicant must provide the information relevant to the proposed project and route plans for required agency approvals before permit issuance⁸. Alpine County publishes a plan-review deposit estimated at $1.00 per square foot up to $2,500.00, subject to the Building Official's determination⁸. If part of the project can be occupied safely before all permitted work is complete, the building official may issue a temporary certificate of occupancy for up to 90 days; a written extension request must show circumstances beyond the applicant's control⁹. Projects that need special inspections must file a final report before a Certificate of Use and Occupancy is issued, and enclosing space under an elevated building in a flood hazard area requires a recorded nonconversion agreement first¹⁰.

Alpine County has countywide zoning under Title 18, with allowed uses, setbacks, parking requirements and height limits varying by district². The AG Agriculture Zone generally requires 20 acres, the NC Neighborhood Commercial Zone requires 10,000 square feet and the C Commercial Zone requires 5,000 square feet, although conditional uses can change those minimums^11,12,13. In RN and RE zones, the county sets minimum parcel size site by site based on services, environmental conditions and the General Plan; a zoning suffix can state the result^14,15. Where public water or sewer is unavailable, lot size must also comply with the county's onsite-wastewater program¹⁶.

The MHD Markleeville Historic District uses the underlying zone's lot-area rule unless its design guidelines are more restrictive¹⁷. A CR Commercial Recreation combined zone generally inherits area and width standards from its paired zone, with the more restrictive rule controlling when the standards differ¹⁸. A single-family unit must contain at least 600 square feet of floor area and measure at least 20 feet in its least dimension⁶. In the AG Zone, standard front, side and rear yards are each 30 feet unless changed for a conditional use¹¹. The Planning Division handles zoning maps and code enforcement¹⁹.

Alpine County Health Department Environmental Health permits residential septic systems and inspects their installation³. For construction needing a new or replacement onsite wastewater treatment system, submit a permit application and scaled plot plan to Environmental Health; that approval must come before Building Safety can issue its permit⁴.

Site feasibility deserves early attention: only 0.4% of mapped county soils are rated without severe limitations for a conventional septic drain field²⁰. That soil statistic does not decide an individual parcel, but it makes a parcel-specific evaluation especially important. Alternative or supplemental systems require annual inspection, and service inspections trigger written reporting requirements⁴. Cesspools, surface effluent discharge and systems dedicated to substantial RV holding-tank waste are not authorized⁴.

Alpine County allows living, sleeping or camping in an RV on a private site owned by the occupant, or used with the owner's written consent, for no more than 16 days per calendar year unless the Planning Commission approves an occupancy-permit extension²¹. An extension may require advance notice, sanitary-waste receipts, Environmental Health approval and a one-RV limit²².

A tiny home must qualify and be approved under an authorized housing category, but we could not confirm a more specific Alpine County tiny-home occupancy rule; ask Planning and Building Safety before relying on one as a dwelling²³. A single mobile or manufactured home may be treated as a single-family residence in the AG, AP, RE and RN zones after approval of a certificate of compatibility⁶. Alpine County permits ADUs in listed districts, but an ADU cannot be a short-term rental and must be rented for more than 30 days^24,25.

1. Ask Planning to confirm the parcel's zoning, allowed residential use, setbacks and height standard^5,16.
2. Confirm legal access; driveway work in a county road right-of-way requires an encroachment permit from Engineering⁸.
3. Resolve water and wastewater early. A new or replacement septic system needs Environmental Health approval before a building permit, and well construction requires a county permit^4,7.
4. Submit the building application and project information through the online portal, then obtain required agency sign-offs⁸.
5. Complete plan review, pay the applicable fees and call Building Safety for inspections as work reaches each required phase^1,8.
6. Do not occupy unfinished permitted space without Building Official approval; a temporary certificate is limited to 90 days unless a written extension is granted⁹.

Start with buildability, not acreage alone. Only 8.2% of Alpine County land has a slope of 15% or less, and 0.4% of mapped soils avoid a severe conventional-drain-field limitation²⁰. Ask Planning about zoning, Environmental Health about septic and well feasibility, and Engineering about driveway access^3,19,26.

If land is being split, a tentative parcel map covers a division into four or fewer parcels, while a tentative subdivision map is required for five or more; a final or parcel map cannot go to the recorder until required improvements are completed or secured by agreement^27,28. A residential short-term rental requires a county license, and the East Slope overlay caps licenses outside commercial zones at 35²⁹. Projects in the Bear Valley, Kirkwood and Markleeville service areas also need the applicable provider's water or sewer approval before a building permit⁹.