Unincorporated Santa Barbara County, California requires building permits for home construction through Planning & Development under the county-adopted building code12. County zoning depends on the applicable inland, Montecito or coastal code3. Every new or replacement septic system needs a permit from the local jurisdiction or the Central Coast Water Board; start with Environmental Health Services for unincorporated land45.
At a glance
- Building permit
- Required for most construction in unincorporated areas6
- Zoning
- Yes, in unincorporated Santa Barbara County3
- Septic
- Permit required; county EHS or the Central Coast Water Board handles it47
- Owner-builder exemption
- Contractor-license exemption only; permits and inspections still apply89
- RV living
- Permanent dwelling use is not the statewide default; ask Planning about the parcel10
- Tiny home
- Allowed if it qualifies as a recognized structure type11
- Accessory dwelling
- Planning-permit exempt when it meets the county ADU rules1213
- Well permit
- Required; EHS is the permitting agency in unincorporated areas14
Who to call
Building permits
Santa Barbara County Planning & Development, Building & Safety Division
Building permits, plan check and inspections for construction in unincorporated Santa Barbara County
Planning & zoning
Santa Barbara County Planning & Development, Development Review / Long-Range Planning
Zoning determinations, land-use permits and parcel/zoning-district questions for unincorporated Santa Barbara County
Septic permits
Onsite wastewater (septic/OWTS) system permits and water-well permits for unincorporated Santa Barbara County
Roads & driveways
Santa Barbara County Public Works Department
County Surveyor filings and subdivision map review; road encroachment (driveway) permits onto county roads. Also staffs a north-county office at 620 W. Foster Road, Santa Maria, CA 93455.
123 E. Anapamu Street, Santa Barbara, CA 93101
Floodplain permits
Floodplain development review for unincorporated Santa Barbara County, reached via the Public Works Department main line
123 E. Anapamu Street, Santa Barbara, CA 93101
Contact details are copied from each office’s official page and were checked against it on October 12, 2026.
Off-grid gear
Going off-grid in Santa Barbara County means bringing your own water and power. The kit we’d start with:
- Water Crystal Quest Filter any source — well, rain, or creek — to drinking-clean.
- Power Bluetti Solar generators and home battery backup for living off the grid.
- Septic Soil percolation test kit Run your own perc test before paying an engineer — the first thing a septic office asks about.
- Water Well water test kit Bacteria, nitrates, hardness — know what the well on a parcel is really pumping.
These are affiliate links — we may earn a commission, at no cost to you. As an Amazon Associate, Bolthole Index earns from qualifying purchases.
Do you need a building permit 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 structure6. 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 checklist15. The Building & Safety Division issues building permits and inspects ongoing construction16. California's owner-builder exemption covers contractor licensing; required building permits and inspections still apply in Santa Barbara County9. 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 classification8. Inside Santa Maria, Santa Barbara, Lompoc and Carpinteria, the cities handle building permits under their own requirements and exemptions17181920. Septic permits remain separate approvals through the applicable local jurisdiction or Central Coast Water Board4.
Who is the Santa Barbara County building department, and how do you reach them?
Santa Barbara County Planning & Development's Building & Safety Division issues building permits and inspects ongoing construction projects2116. The Development Review and Long-Range Planning side of the department handles zoning questions and land-use permits22. Use Planning & Development's planning and building application forms and project-specific plan-check requirements15. Santa Barbara County regulates subdivisions, lot-line adjustments, parcel mergers and certificates of compliance in the unincorporated area23. A subdivision-regulated project must comply with those rules before a building or zoning permit can issue24. 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 review2526. Santa Barbara County Surveyor fees increased 3% effective July 1, 2026; that schedule covers subdivision-map and document review, not a flat building-permit price27. Ask Building & Safety for the building-plan-check and building-permit charges for your project21.
Does Santa Barbara County have zoning?
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 limits282930. Goleta, Guadalupe, Solvang and Buellton also administer city zoning31323334. 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 program435. 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 requirements36. That floor is not a universal minimum for every existing parcel; ask Planning & Development for the parcel's lot size, setbacks, coverage and height standards22. 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 apply13.
How do septic permits work in Santa Barbara County?
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 requirements5. The same county office permits private water wells in unincorporated areas3714. 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 work38.
Can you live in an RV or tiny home on your land in Santa Barbara County?
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 parks10. 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 trailer11. Santa Barbara County's residential-zone table permits mobile homes in designated MHP and MHS zones, with a permanent foundation required under the MHS condition39. 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 home22. 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 standards40. 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 it41.
Building a home in Santa Barbara County: the steps, in order
- Ask Planning & Development to identify the parcel's zoning district and applicable inland or coastal standards before design begins223.
- 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 buildable4225.
- 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 review737. Apply to Environmental Health Services for a private well permit if needed14.
- Ask Public Works about floodplain review and access; a driveway within a state highway right of way requires a Caltrans encroachment permit2643.
- Submit building plans for county plan check under the county-adopted 2025 code152.
- If acting as owner-builder, remember that the licensing exemption does not remove building permits or inspections9. Schedule inspections with Building & Safety as construction proceeds1621.
What to check before you buy land in Santa Barbara County
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 system38. 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 sought42. About 47.3% of Santa Barbara County is federal land, which can shape access and neighbors on nearby rural parcels44. Only about 24.8% of the county's land is at 15% slope or less, so confirm the building site's grade45. Severe drought has affected the county in roughly 41.3% of years, making well yield and water planning material due-diligence questions46. Before closing, confirm zoning, legal-lot status, floodplain status, access, water and septic feasibility with the responsible county offices222637.
Watch-outs
- The 7,000-square-foot rule applies to creation of residential subdivision lots, not automatically to every existing parcel; ask Planning & Development for the parcel's zoning, legal-lot status, setbacks and building-height rules3622.
- We could not confirm short-term rental and homestay rules for unincorporated Santa Barbara County; ask Planning & Development before planning to rent out a home or accessory dwelling unit22.
- We could not confirm a general agricultural building exemption or private-land temporary-camping rule in Santa Barbara County; ask Planning & Development before treating a barn or an RV stay during construction as exempt22.
Sources
- Santa Barbara County Planning & Development - Building Permit Applications (2026 county census)
- Chapter 10 - Building Regulations, Santa Barbara County Code, quoted and re-checked
- Chapter 21 Land Division — Subdivision Regulations, quoted and re-checked
- Septic System (Onsite Wastewater Treatment Systems, OWTS) Permit Information, quoted and re-checked
- Subdivision regulations, quoted and re-checked
- Building Code, quoted and re-checked
- Septic System (Onsite Wastewater Treatment Systems, OWTS) Local Agency Management Plans, quoted and re-checked
- Owner-Builder Overview, quoted and re-checked
- Building Officials - Owner-Builder Overview, quoted and re-checked
- hcd.ca.gov (California statewide rule), quoted and re-checked
- Information Bulletin 2016-01: Tiny Homes (California statewide rule), quoted and re-checked
- Article 35.2 - Zones and Allowable Land Uses, quoted and re-checked
- Santa Barbara County Land Use and Development Code, Section 35.20.020, quoted and re-checked
- Permitting Agencies, quoted and re-checked
- Permitting & Enforcement, quoted and re-checked
- Contact Our Divisions, quoted and re-checked
- Santa Maria: CHAPTER 9-04: BUILDING CODE - City of Santa Maria, CA (Santa Barbara County), quoted and re-checked
- Santa Barbara: Building Permit Forms & Applications | City of Santa Barbara (Santa Barbara County), quoted and re-checked
- Lompoc: Chapter 15.04 Construction Regulations (Santa Barbara County), quoted and re-checked
- Carpinteria: Building and Safety - City of Carpinteria (Santa Barbara County), quoted and re-checked
- Santa Barbara County Planning & Development, Building & Safety Division (countyofsb.org)
- Santa Barbara County Planning & Development, Development Review / Long-Range Planning (countyofsb.org)
- Subdivision regulations, quoted and re-checked
- Subdivision regulations, quoted and re-checked
- Santa Barbara County Public Works Department (surveyor.countyofsb.org)
- Santa Barbara County Public Works Department, Water Resources Division (Development Review / Floodplain Management) (surveyor.countyofsb.org)
- Public Notice to Revise County Surveyor Fees for Fiscal Year 2026-2027, quoted and re-checked
- Santa Maria: CHAPTER 12-3: DISTRICTS AND MAP - City of Santa Maria, CA (Santa Barbara County), quoted and re-checked
- Santa Barbara: Chapter 30.05: Zones, Zoning Map, and Boundaries - City of Santa Barbara, CA (Santa Barbara County), quoted and re-checked
- Carpinteria: Carpinteria Municipal Code § 14.12.050—Minimum parcel size (Santa Barbara County), quoted and re-checked
- Goleta: Table of Contents - City of Goleta, CA (Santa Barbara County), quoted and re-checked
- Guadalupe: Code of Ordinances, City of Guadalupe (Santa Barbara County), quoted and re-checked
- Solvang: City of Solvang, CA Code of Ordinances (Santa Barbara County), quoted and re-checked
- Buellton: Chapter 19.02 Zoning Districts and Allowable Land Uses (Santa Barbara County), quoted and re-checked
- Buellton: Santa Barbara County IRWM Plan Update 2019 (Santa Barbara County), quoted and re-checked
- Subdivision regulations, quoted and re-checked
- Santa Barbara County Public Health Department, Environmental Health Services (Liquid Waste / OWTS Program) (countyofsb.org)
- Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
- Santa Barbara County Residential Zones Allowable Land Uses, quoted and re-checked
- Sec. 15A-20. Standards for recreational vehicles, quoted and re-checked
- Sec. 26-38.1. Unlawful use of vehicle/recreation vehicle, quoted and re-checked
- Chapter 21 - Land Division, quoted and re-checked
- Encroachment Permits | Caltrans (California statewide rule), quoted and re-checked
- Federal land share: Bolthole Index county data
- Share of land at 15% slope or less: Bolthole Index county data
- Share of years in severe drought: Bolthole Index county data
Written October 12, 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.