Building permits, zoning and land rules in Santa Barbara County, California

Unincorporated Santa Barbara County requires a building permit when its code requires one for construction, alteration, enlargement, movement or maintenance of a building or structure³. The county has adopted the 2025 California Building Code with local amendments, and detached one- and two-family dwellings and qualifying townhouses follow the California Residential Code². Building plan submittal requirements vary by project type, so use the county's plan-check process for the applicable checklist⁹. The Building & Safety Division issues building permits and inspects ongoing construction¹⁰. California's owner-builder exemption covers contractor licensing; required building permits and inspections still apply in Santa Barbara County⁵. Owners doing the work themselves or through wage-paid employees must not intend the structure for sale, and owners cannot perform well-drilling work covered by the well-drilling contractor classification⁵. Inside Santa Maria, Santa Barbara, Lompoc and Carpinteria, the cities handle building permits under their own requirements and exemptions^11,12,13,14. Septic permits remain separate approvals through the applicable local jurisdiction or Central Coast Water Board⁴.

Santa Barbara County Planning & Development's Building & Safety Division issues building permits and inspects ongoing construction projects^10,15. The Development Review and Long-Range Planning side of the department handles zoning questions and land-use permits⁹. Use Planning & Development's planning and building application forms and project-specific plan-check requirements⁹. Santa Barbara County regulates subdivisions, lot-line adjustments, parcel mergers and certificates of compliance in the unincorporated area³. A subdivision-regulated project must comply with those rules before a building or zoning permit can issue³. The Public Works Department can be reached at (805) 568-3000, 123 E. Anapamu Street, Santa Barbara, for County Surveyor matters and questions involving county roads or floodplain review¹⁶. Santa Barbara County Surveyor fees increased 3% effective July 1, 2026; that schedule covers subdivision-map and document review, not a flat building-permit price¹⁶. Ask Building & Safety for the building-plan-check and building-permit charges for your project¹⁵.

Santa Barbara County's zoning framework for unincorporated land includes the County Land Use and Development Code, Montecito Land Use and Development Code and Coastal Zoning Ordinance, as applicable³. Santa Maria, Santa Barbara and Carpinteria set zoning inside their city limits^17,18,19. Goleta, Guadalupe, Solvang and Buellton also administer city zoning^20,21,22,23. City zoning does not replace septic approval through the applicable local jurisdiction or Central Coast Water Board; Buellton's qualifying systems remain under Environmental Health Services' county program^4,24. For a new residential subdivision, Chapter 21 generally bars creation of a lot smaller than 7,000 square feet excluding street right-of-way, subject to exceptions and other zoning requirements³. That floor is not a universal minimum for every existing parcel; ask Planning & Development for the parcel's lot size, setbacks, coverage and height standards⁹. A compliant accessory dwelling unit or junior accessory dwelling unit is exempt from the Development Code's planning-permit requirements, but building, health, septic, coastal and utility approvals can still apply⁷.

Every new or replacement septic system in Santa Barbara County needs a permit through the applicable city or county jurisdiction or the Central Coast Water Board⁴. Santa Barbara County has an approved Local Agency Management Program (LAMP); new or replacement systems that do not meet the approved LAMP or OWTS Policy Tier 1 conditions require a Central Coast Water Board permit⁴. Minor repairs and qualifying major repairs may avoid a Central Coast Water Board permit under its conditions; that exception does not waive the permit for a new or replacement system⁴. For a private septic system on an unincorporated subdivision parcel, Environmental Health Services determines county permitting, installation and percolation-test requirements³. The same county office permits private water wells in unincorporated areas^8,25. Soils are a major constraint: only 3% of Santa Barbara County's soils rate free of severe limitations for a conventional septic drain field, so arrange a site evaluation before assuming a standard system will work²⁶.

Under California law, an RV is not intended as a permanent dwelling; unless a local ordinance allows otherwise, RV occupancy is generally limited to mobilehome parks or special occupancy parks⁶. A tiny home can be occupied only when it meets the standards for, and is approved as, a recognized structure type such as a code-built home, manufactured home, factory-built home, RV or park trailer⁶. Santa Barbara County's residential-zone table permits mobile homes in designated MHP and MHS zones, with a permanent foundation required under the MHS condition⁷. We could not confirm a county rule for long-term RV occupancy or tiny homes outside those recognized classifications, so ask Planning & Development about the parcel's zoning before planning to live in an RV or movable tiny home⁹. Inside a mapped floodplain, county floodplain rules require a recreational vehicle to be on the site fewer than 180 consecutive days, or be fully licensed and ready for highway use, or meet the county floodplain permit and elevation standards²⁷. Sleeping or camping in an RV or trailer in any county recreation area is unlawful unless the Board of Supervisors or a county lease allows it²⁸.

1. Ask Planning & Development to identify the parcel's zoning district and applicable inland or coastal standards before design begins^3,9.
2. If the project divides land or adjusts lot lines, take the map or certificate-of-compliance question to Planning & Development and the County Surveyor before treating the parcel as buildable^3,16.
3. Line up water and wastewater: take a conventional septic proposal to Environmental Health Services, and ask whether the system stays under the county program or needs Central Coast Water Board review^4,25. Apply to Environmental Health Services for a private well permit if needed⁸.
4. Ask Public Works about floodplain review and access; a driveway within a state highway right of way requires a Caltrans encroachment permit^16,29.
5. Submit building plans for county plan check under the county-adopted 2025 code^2,9.
6. If acting as owner-builder, remember that the licensing exemption does not remove building permits or inspections⁵. Schedule inspections with Building & Safety as construction proceeds^10,15.

Check septic soils first: only 3% of the county's soils rate free of severe limitations for a conventional drain field, so get a site evaluation before you count on a standard system²⁶. If a parcel came from an old split or lot-line change, confirm that it is a legal building site: some older divisions may avoid a new subdivision map yet still must satisfy applicable zoning when a building permit is sought³. About 47.3% of Santa Barbara County is federal land, which can shape access and neighbors on nearby rural parcels²⁶. Only about 24.8% of the county's land is at 15% slope or less, so confirm the building site's grade²⁶. Severe drought has affected the county in roughly 41.3% of years, making well yield and water planning material due-diligence questions²⁶. Before closing, confirm zoning, legal-lot status, floodplain status, access, water and septic feasibility with the responsible county offices^9,16,25.