Santa Barbara County, CA Building Permits, Zoning & Septic

Unincorporated Santa Barbara County, California requires a building permit for most home construction, issued by the county's Planning & Development department under the state building code¹². The county also enforces zoning in the unincorporated area³, and septic systems go through the Public Health Department's Environmental Health Services under the state's onsite-wastewater policy⁴⁵. Coastal-plain soils here rate poorly for conventional drain fields, so budget for a site evaluation and likely an engineered or mound system⁶.

At a glance

Building permit: Required for most construction in unincorporated areas¹
Zoning: Yes, in unincorporated Santa Barbara County³
Septic: Permitted by county Environmental Health Services (EHS)⁴
Owner-builder exemption: Available under California law, with conditions⁷⁸
RV living: Temporary only, unless a local ordinance allows more⁹
Tiny home: Allowed if it qualifies as a recognized structure type¹⁰
Well permit: Required; EHS is the permitting agency in unincorporated areas¹¹
Septic soil suitability: Only 3% of soils rate free of severe limits for a conventional drain field⁶

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

Online permits →

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

Santa Barbara County Public Health Department, Environmental Health Services (Liquid Waste / OWTS Program)

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.

(805) 568-3000

123 E. Anapamu Street, Santa Barbara, CA 93101

Floodplain permits

Santa Barbara County Public Works Department, Water Resources Division (Development Review / Floodplain Management)

Floodplain development review for unincorporated Santa Barbara County, reached via the Public Works Department main line

(805) 568-3000

123 E. Anapamu Street, Santa Barbara, CA 93101

Contact details are copied from each office’s official page and were checked against it on September 24, 2026.

Do you need a building permit in Santa Barbara County, California?

Yes. Unincorporated Santa Barbara County requires a building permit for most residential construction, and the county's Planning & Development department issues those permits under Title 24, California's statewide building code¹. The 2025 California Building Standards Code applies to any permit application dated January 1, 2026 or later². Building plan submittal requirements vary by project type, and the county directs applicants to its plan-check process for specifics¹²¹³. If you plan to do the work yourself, California's statewide owner-builder exemption lets you skip contractor licensure in most cases, but you still must sign an Owner-Builder Declaration when the permit is issued and stay within the exemption's limits⁷⁸.

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 runs inspections for unincorporated parts of the county¹⁴. The Development Review and Long-Range Planning side of the same department handles zoning questions and land-use permits¹⁵. Both departments run their permit-status lookup and application forms through the county's own website rather than listing a direct phone number on their public pages, so start at the Planning & Development permitting hub and use its online forms or permit-status tool¹⁴¹⁵. For anything involving a driveway onto a county road, subdivision map review, or floodplain development, the Public Works Department keeps a published phone line and street address: (805) 568-3000, 123 E. Anapamu Street, Santa Barbara¹⁶.

Does Santa Barbara County have zoning?

Yes, unincorporated Santa Barbara County has its own zoning and land-use regulation, separate from the incorporated cities within the county³. California law gives every county's board of supervisors general authority to zone buildings, structures, land uses, lot coverage, setbacks and parking within its jurisdiction, including unincorporated territory¹⁷. What that means for a specific parcel, however, depends on its zoning district: we could not verify a countywide numeric standard for minimum lot size, building setbacks, lot coverage or building height on the county's own pages, so confirm those for your parcel directly with Planning & Development before you design a project¹⁵.

How do septic permits work in Santa Barbara County?

Environmental Health Services, part of the county's Public Health Department, permits onsite wastewater treatment systems (septic) under a state-approved Local Agency Management Program that implements California's statewide OWTS Policy⁴⁵. The same office is also the permitting agency for private water wells in unincorporated Santa Barbara County¹⁸¹¹; well drillers must file a well-completion report with the state Department of Water Resources within 60 days of finishing the work¹⁹. Soils matter here: only 3% of Santa Barbara County's soils rate free of severe limitations for a conventional septic drain field under the USDA's soil survey, which means most parcels should expect a site evaluation and a real chance of needing an engineered or mound system rather than a standard leach field⁶.

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

Under California law, an RV is not meant for occupancy as a permanent dwelling; unless a local ordinance says otherwise, RVs are generally only allowed to be occupied in a mobilehome park or a special occupancy park⁹. A tiny home can be occupied if it complies with the standards for, and is approved as, one of several recognized structure types: a HUD-Code manufactured home, a California Residential or Building Code home, factory-built housing, a recreational vehicle, a park trailer, or a camping cabin¹⁰. A manufactured home can likewise be sited inside or outside a mobilehome park under the state's Mobilehome Parks Act, subject to local agency approval²⁰. We did not find a Santa Barbara County-specific ordinance addressing tiny-home or RV occupancy on unincorporated land, so confirm the zoning district and any local rule with Planning & Development before you plan to live on-site in an RV, park trailer or tiny home¹⁵.

Building a home in Santa Barbara County: the steps, in order

Confirm your parcel's zoning district and any development standards with Planning & Development before you design anything¹⁵³.
Line up water and septic: apply for a septic (OWTS) permit and, if you need a well, a well permit through Environmental Health Services¹⁸⁴¹¹.
If your access road connects to a county road, check whether you need an encroachment permit for the driveway, and check floodplain status, through Public Works¹⁶²¹.
Submit building plans for plan check with Building & Safety; the 2025 California Building Standards Code applies to any application dated January 1, 2026 or later¹⁴².
If you're doing the work yourself, sign the Owner-Builder Declaration at permit issuance and keep within the exemption's limits on licensed subcontractors and resale⁸.
Schedule inspections with Building & Safety as work proceeds¹⁴.

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 system⁶. About 47.3% of Santa Barbara County is federal land, mostly national forest in the mountains, which shapes access and neighbors on rural parcels near it²². Only about 24.8% of the county's land sits at 15% slope or less, so confirm your building site's grade before you assume it's easily buildable²³. The county has been in severe drought roughly 41.3% of years, a real factor for well yield and landscaping plans²⁴. The nearest metro area is about 25 miles away²⁵. Budget for carrying costs too: the typical property tax bill here runs about $4,870 a year at an effective rate near 0.7%, and typical homeowner's insurance runs about $2,030 a year²⁶²⁷²⁸. If you're pricing agricultural land, county farmland has been valued at roughly $21,172 an acre²⁹. Before closing, confirm floodplain status and any driveway/encroachment requirements directly with Public Works²¹¹⁶.

Watch-outs

Santa Barbara County's own zoning and building-safety pages did not publish a countywide numeric lot-size, setback or building-height standard we could verify; call Planning & Development with your parcel number before you design a project¹⁵.
Short-term rental and homestay rules for unincorporated Santa Barbara County were not confirmed on the county's own pages during this review; ask Planning & Development before you plan to rent out a home or accessory dwelling unit¹⁵.
We could not verify a phone number, email or address for Planning & Development or Environmental Health Services on any page their own website would let us fetch; use their online forms and permit-status tools, or reach Public Works at (805) 568-3000 for anything involving county roads or floodplain status¹⁴¹⁶.

Sources

Written September 24, 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.

How Santa Barbara County scores

Seclusion54100% ev.

Self-Sufficiency33100% ev.

Admin Boringness41100% ev.

Durability25100% ev.

Property Autonomy56100% ev.

Carry Cost27100% 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 →

$998kTypical home

0.7%Property tax

$21,172Land / acre

18.9"Annual rain

41.3% of yrsSevere drought

1.5 / yr (+1)Mid-century 100°F days

126 daysMid-century dry spell

2.15" (+5.7%)Mid-century 1-day rain

1.1×Wildfire change factor

100%Forward climate coverage

$2,030Home insurance / yr

4.9% / yrInsurance growth

1.3%Nonrenewal rate

county median (2+ published ZIPs)Insurance basis

18,505People within 30 min

1,255,536People within 2 hr

88,050Radius comparison (15 mi)

161.4People / sq mi

47.3%Federal land

24.8%Land at 15% slope or less

3%Septic soil without severe limits

47,597 acWorkable land screen

49.1%Wooded land

16.4 tonsBiomass / forest ac

58.9°FAvg temp

Answers from the rulebook for Santa Barbara County

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

Santa Barbara County rules

County-wide zoningPresent (with conditions)
County zoning and land-use regulation in unincorporated Santa Barbara County.
- The cited County regulation applies to land in the unincorporated area; incorporated municipalities are outside this claim's geographic scope.
- Development must also comply with applicable state requirements and other County regulations.
“Staff is preparing the Phase I ordinance amendments to the Land Use and Development Code (LUDC) and Coastal Zoning Ordinance (CZO) to prohibit onshore drilling of new oil and gas wells and reentering previously abandoned wells in the unincorporated areas of Santa Barbara County.”
Subdivision Regulations, Chapter 21 Land Division ↗Re-checked Sep 24, 2026
Well permitRequired
Construction, alteration, or destruction of water wells in unincorporated Santa Barbara County.
- California DWR identifies Santa Barbara County Environmental Health Services as the permitting agency for unincorporated areas.
- Local requirements may meet or exceed DWR Well Standards.
- Wells supplying public supply systems may have additional State Water Resources Control Board Division of Drinking Water requirements.
- Well drillers must submit a well-completion report to DWR within 60 days under the statewide rule.
well completion report deadline: 60 days after completion of work
“Santa Barbara County Environmental Health Services (Unincorporated areas)”
Permitting Agencies ↗Re-checked Sep 24, 2026
Permit feesPublished (with conditions)
County Surveyor fees, including subdivision map and document review fees administered by Santa Barbara County.
- The published schedule is specific to County Surveyor fees and does not establish that every county permit fee is a single fixed amount.
- The schedule states it is effective July 1, 2026.
- The schedule states fees may increase by 3.0% for fiscal year 2026-2027 under County Ordinance 5132 and CPI adjustment.
- A minimum of three reviews applies per fixed-fee submission before conversion to a deposit, except Record of Surveys as shown in the schedule.
effective date: 2026-07-01 · fee adjustment: 3 percent (Fiscal year 2026-2027; CPI-based adjustment)
“Effective July 1, 2026, the County Surveyor Fees will increase by 3.0% for Fiscal year 2026-2027.”
Public Notice to Revise County Surveyor Fees for Fiscal Year 2026-2027 ↗Re-checked Sep 24, 2026
Permit processPublished (with conditions)
Planning and building permitting administered by Santa Barbara County Planning & Development for projects in unincorporated Santa Barbara County.
- Building plan submittal requirements may vary depending on the type of project proposed.
- The page directs users to the plan check process and planning/building permit application forms.
“Learn about the plan check process. Building plan submittal requirements may vary depending on the type of project proposed.”
Permitting & Enforcement ↗Re-checked Sep 24, 2026

California rules that apply here

Building permitRequired
Construction projects within the California Department of Health Care Access and Information Office of Statewide Hospital Planning and Development jurisdiction, including health-facility projects requiring HCAI review.
- Written plan approval must be issued before the building-permit application proceeds.
- The application must provide contractor information, Inspector of Record information, and a Testing Inspection and Observation program.
- The TIO program must be field-approved before approval and subsequent issuance of the building permit.
- This claim does not establish the permit rule for projects outside HCAI jurisdiction.
“Once a project receives written plan approval, a Building Permit application is submitted through the e-Services Portal.”
Building Permits & Construction Observation ↗Re-checked Sep 26, 2026
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”
California Business and Professions Code Section 7044 ↗Re-checked Sep 26, 2026
3 more reviewed findings on this topic
- Available (with conditions) — California owner-builders who construct, alter, repair, improve, or remodel a building or structure on property they own, subject to the stated licensure-exemption conditions.
  “An owner-builder is exempt from licensure, but there are limitations.”
  Building Officials - Owner-Builder Overview ↗Re-checked Sep 24, 2026
- 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”
  California Business and Professions Code Section 7044 ↗Re-checked Sep 26, 2026
- 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”
  California Business and Professions Code section 7044 ↗Re-checked Sep 26, 2026
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.”
Approved Building Standards ↗Re-checked Sep 9, 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”
  California Health and Safety Code Section 17922 ↗Re-checked Sep 26, 2026
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”
HCAI Standard Project Process ↗Re-checked Sep 26, 2026
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.”
  Owner-Builder Responsibilities ↗Re-checked Sep 26, 2026
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.”
HCAI Standard Project Process ↗Re-checked Sep 26, 2026
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.”
Chrome Plating Amendments Environmental and Regulatory Setting ↗Re-checked Sep 26, 2026
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.”
California Health and Safety Code Section 17958.1 ↗Re-checked Sep 9, 2026
SetbacksSpecified
Qualifying SB 9 housing developments in single-family residential zones, including development of up to two primary residential units, subject to the cited statutory eligibility requirements and local ministerial review.
- The parcel must be located in a single-family residential zone.
- The project must involve no more than two residential units.
- Objective standards may be applied only if they do not physically preclude the statutory housing objectives, subject to the stated exceptions.
- No setback may be required for an existing structure or a structure constructed in the same location and to the same dimensions as an existing structure.
- For SB 9 projects, side and rear setbacks may not exceed four feet; a local agency may apply a lesser setback, such as 0–4 feet.
- The local agency cannot apply existing side and rear setbacks applicable in the single-family residential zones.
- The four-foot side and rear setback standards are not subject to modification.
- The fact sheet cites Government Code Sections 65852.21(b)(2)(B) and 66411.7(c)(3).
maximum side setback: <= 4 feet (A local agency may choose to apply a lesser setback, including 0–4 feet.) · maximum rear setback: <= 4 feet (A local agency may choose to apply a lesser setback, including 0–4 feet.)
“SB 9 establishes an across-the-board maximum four-foot side and rear setbacks.”
SB 9 Fact Sheet ↗Re-checked Sep 26, 2026
One more reviewed finding on this topic
- District specific (with conditions) — Building setbacks, side and rear yard requirements, and property line requirements under California's State Housing Law framework.
  “building setback, side and rear yard requirements, and property line requirements are hereby specifically and entirely reserved to the local jurisdictions”
  California Health and Safety Code Section 17922 ↗Re-checked Sep 26, 2026
Living in an RVTemporary only (with conditions)
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.
- Applicable state or local approval and enforcement requirements depend on the RV's location and classification.
maximum gross area: <= 400 square feet (Measured at maximum horizontal projections; internal living room area must be less than 320 square feet excluding specified built-in equipment and bath/toilet rooms.)
“RVs are not intended for occupancy as a permanent dwelling. [...] Unless otherwise allowed by a local ordinance, RVs generally may be occupied only in mobilehome parks or special occupancy parks”
Information Bulletin 2016-01: Tiny Homes ↗Re-checked Sep 9, 2026
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.”
California Off-Highway Motor Vehicle Laws 2014 ↗Re-checked Sep 26, 2026
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.”
  What is a Mobilehome Park or Special Occupancy Park? ↗Re-checked Sep 26, 2026
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).”
Information Bulletin 2016-01: Tiny Homes ↗Re-checked Sep 9, 2026
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.”
Information Bulletin 2016-01: Tiny Homes ↗Re-checked Sep 9, 2026
Accessory dwellingsAllowed (with conditions)
ADUs and junior ADUs subject to California State ADU Law.
- Approval is ministerial and without discretionary review or a hearing.
- Development standards must be objective and knowable in advance.
- The local permitting agency must determine application completeness and provide written notice within 15 business days.
- If an application is incomplete, the agency must identify missing items and explain how to complete it.
- Local site, building, health, safety, fire, utility, and other applicable requirements continue to apply.
written completeness determination: <= 15 business days (Measured from the permitting agency's receipt of the application.) · final written determination after appeal: <= 60 business days (Applies after receipt of the written appeal.)
“A permit application for an accessory dwelling unit shall be considered and approved ministerially without discretionary review or a hearing [...] A permitting agency shall determine whether an application to create or serve an accessory dwelling unit is complete and provide written notice of this determination to the applicant not later than 15 business days after the permitting agency received the application.”
Accessory Dwelling Unit Handbook March 2026 ↗Re-checked Sep 9, 2026
Who permits septicMixed (with conditions)
California onsite wastewater treatment systems, including septic systems primarily treating domestic wastewater through subsurface disposal.
- The State Water Resources Control Board establishes the statewide OWTS Policy.
- Local agencies, such as county environmental health departments, issue OWTS permits under the statewide policy.
- Local Agency Management Programs may establish locally tailored siting and design standards.
OWTS Policy effective date: 2013-05-13 (Except for Tier 3, local agencies could continue existing permitting programs for 60 months after the effective date.) · Tier 1 maximum flow: <= 3500 gallons per day (Applies to qualifying new or replacement OWTS where no approved LAMP applies.) · Tier 2 maximum flow: <= 10000 gallons per day (Applies under an approved LAMP.)
“The State Water Resources Control Board [...] adopted the OWTS Policy in June 2012. The OWTS Policy authorizes local agencies [...] to issue OWTS permits.”
Onsite Waste Water Treatment Systems ↗Re-checked Sep 26, 2026
One more reviewed finding on this topic
- Mixed (with conditions) — Statewide regulation and management of onsite wastewater treatment systems, commonly known as septic systems.
  “Implementation of the OWTS Policy will be overseen by the State Water Board and the regional water quality control boards”
  Water Quality Control Policy for Siting, Design, Operation and Maintenance of Onsite Wastewater Treatment Systems (OWTS Policy) ↗Re-checked Sep 9, 2026
Septic permitLimited
New, replacement, and corrective-action OWTS in California; existing properly functioning systems may fall under Tier 0 rather than new/replacement permitting requirements.
- Tier 1 applies to qualifying new or replacement OWTS when no Regional Water Board-approved LAMP exists, with a maximum flow of 3,500 gallons per day.
- Tier 2 applies to qualifying new or replacement OWTS under an approved LAMP, with a maximum flow of 10,000 gallons per day.
- Tier 3 applies near impaired surface waters subject to a TMDL, a special LAMP provision, or within 600 feet of a water body listed on OWTS Policy Attachment 2; supplemental treatment may apply.
- Tier 4 applies to systems that are not properly functioning and require corrective action.
- Local agencies issue the permits and local LAMP requirements may differ from Tier 1.
Tier 1 maximum flow: <= 3500 gallons per day (Qualifying new or replacement OWTS without an approved LAMP.) · Tier 2 maximum flow: <= 10000 gallons per day (Qualifying new or replacement OWTS under an approved LAMP.) · Tier 3 water-body setback: <= 600 feet (Applies to a water body listed on OWTS Policy Attachment 2.)
“Tier 1 applies when a Local Agency Management Program (LAMP) has not been approved by the Regional Water Board. Maximum flow rate is 3,500 gpd.”
Onsite Waste Water Treatment Systems ↗Re-checked Sep 26, 2026
One more reviewed finding on this topic
- Required — New and replacement onsite wastewater treatment systems (OWTS), commonly known as septic systems, statewide in California.
  “Every new or replacement septic system requires a permit, either through your local jurisdiction (City or County) OR from the Central Coast Water Board.”
  2023 OWTS Policy ↗Re-checked Sep 26, 2026
Septic inspectionLimited
OWTS in a Tier 3 Advanced Protection Management Program with supplemental treatment components, including systems in specified impaired-water-body areas statewide.
- The requirement applies to OWTS in an Advanced Protection Management Program with supplemental treatment components.
- Ongoing monitoring must follow the OWTS operation and maintenance manual or occur more frequently if required by the local agency or Regional Water Board.
- Where telemetry is not possible, the owner or owner's agent must inspect at least monthly while the system is in use and notify the service provider at least quarterly of observed operating parameters.
- For systems designed to meet disinfection requirements, a service provider must inspect proper operation quarterly while the system is in use unless continuous telemetric monitoring is capable of assessing operation.
- Quarterly effluent sampling and certified-laboratory requirements apply to systems subject to the disinfection provisions.
inspection frequency where telemetry is not possible: per monthly (While the system is in use.) · inspection frequency for disinfection systems: per quarterly (While the system is in use, unless continuous telemetric monitoring is capable of assessing operation.)
“Where telemetry is not possible, the owner or owner’s agent shall inspect the system at least monthly while the system is in use as directed and instructed by a service provider and notify the service provider not less than quarterly of the observed operating parameters of the OWTS. [...] OWTS in an Advanced Protection Management Program designed to meet the disinfection requirements in Section 10.10 shall be inspected for proper operation quarterly while the system is in use by a service provider unless a telemetric monitoring system is capable of continuously assessing the operation of the disinfection system.”
2023 OWTS Policy ↗Re-checked Sep 26, 2026
Mandatory utility hookupSewer (with conditions)
Certain existing OWTS in California Tier 3 impaired-water-body areas that commit to connect to a centralized wastewater collection and treatment system regulated through waste discharge requirements.
- The OWTS must have been constructed and operating, or permitted, on or before the date the nearby water body was added to OWTS Policy Attachment 2.
- The owner must commit by legally binding document to connect to a centralized wastewater collection and treatment system regulated through waste discharge requirements.
- The owner must sign the legally binding document within 48 months after the nearby water body's initial listing on Attachment 2.
- The specified connection date may not extend beyond nine years after the date the nearby water body is added to Attachment 2.
- The rule is an exception to Section 10 requirements for qualifying existing or permitted systems; it is not a general statewide requirement that every property connect to public sewer.
deadline to sign connection commitment: 48 months (Measured from the date the nearby water body is initially listed on Attachment 2.) · maximum time to complete connection: <= 9 years (Measured from the date the nearby water body is added to Attachment 2.)
“The owner must sign the document within forty-eight months of the date that the nearby water body is initially listed on Attachment 2. The specified date for the connection to the centralized community wastewater collection and treatment system shall not extend beyond nine years following the date that the nearby water body is added to Attachment 2.”
2023 OWTS Policy ↗Re-checked Sep 26, 2026
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.”
California Government Code Section 66424 ↗Re-checked Sep 9, 2026
Driveway accessRequired
Driveways and driveway connections involving proposed encroachments within, under, or over State highway rights of way.
- The requirement applies to proposed activities related to placement of encroachments within, under, or over State highway rights of way.
- Applications are submitted to the appropriate District Encroachment Permits Office having jurisdictional authority over the site.
- Local or other agency requirements may also apply outside State highway rights of way.
“An encroachment permit must be obtained for all proposed activities related to the placement of encroachments within, under, or over the State highway rights of way.”
Encroachment Permits | Caltrans ↗Re-checked Sep 26, 2026
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.”
Manufactured & Mobilehomes ↗Re-checked Sep 26, 2026
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”
  Silver Strand State Beach Campground Rules and Regulations ↗Re-checked Sep 9, 2026
- 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”
  What is a Mobilehome Park or Special Occupancy Park? ↗Re-checked Sep 26, 2026
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:”
California Government Code Section 65850 ↗Re-checked Sep 21, 2026
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”
Information Bulletin 2021-02: 2019 California Building Standards Code Supplement ↗Re-checked Sep 26, 2026

Still unanswered

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

Minimum lot size — Minimum lot size in unincorporated Santa Barbara County.
Lot coverage — Lot-coverage limits in unincorporated Santa Barbara County.
Building height — Building-height limits in unincorporated Santa Barbara County.
Agricultural exemption — Agricultural exemptions from applicable county land-use, subdivision, or building requirements in unincorporated Santa Barbara County.
Building in a floodplain — Development in floodplain or flood-hazard areas of unincorporated Santa Barbara County.

1 more unanswered

Short-term rentals

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.

Water rights & wells in Santa Barbara County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from California’s water agency.

Adjudicated — rights fixed

Water rights here have been fixed by a court. New supply effectively means acquiring an existing right.

Household wellPermit required — restricted

California requires no STATE permit for a domestic well — wells are permitted by the county — but under SGMA a Groundwater Sustainability Agency can meter or restrict new wells in medium/high-priority and critically overdrafted basins, and Executive Order N-7-22 requires counties in those basins to get GSA verification that a new well is consistent with the Groundwater Sustainability Plan before permitting.

Limit: 2 acre-feet/year de minimis under SGMA (Water Code §10721(e)) — largely exempt from GSA metering/fees

California DWR / State Water Board — SGMA de minimis & EO N-7-22 Action 9 FAQ ↗

Santa Maria Valley Basin — Adjudicatedlocalized of county
Adjudicated 2008 under a stipulated judgment; new appropriation effectively closed to new landowners.
California DWR — Adjudicated Areas (Bulletin 118) ↗
Goleta Basin — Adjudicatedlocalized of county
Adjudicated 1989 (Goleta) under a watermaster; new appropriation effectively closed to new landowners.
California DWR — Adjudicated Areas (Bulletin 118) ↗
Cuyama Valley Basin — Critically Overdraftedpartial of county
Adopted GSP with allocation-based pumping reductions; new agricultural wells effectively curtailed; new wells subject to county permit + EO N-7-22/GSA review.
California DWR Bulletin 118 — Critically Overdrafted Basins ↗
Carpinteria & San Luis Obispo Valley Basins — High Prioritylocalized of county
High-priority SGMA basins with adopted GSPs; new wells subject to GSA/EO N-7-22 review.
California DWR — SGMA Basin Prioritization ↗

Hybrid state (appropriation + riparian). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the California state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Santa Barbara County, California

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

Santa Barbara County scores 41/100 on the Bolthole Index, a marginal county profile. Watch-outs: elevated current hazard exposure and higher long-term carry cost.

Do you need a building permit in Santa Barbara County, California?

Santa Barbara County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Santa Barbara County Public Health Department, Environmental Health 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 Santa Barbara County?

Living in an RV on your own land in Santa Barbara 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 Santa Barbara County, California?

Land in Santa Barbara County runs about $21,172 per acre, based on the latest county data.

What is the water situation in Santa Barbara County?

Santa Barbara County gets about 18.9" of rain a year, with severe drought in roughly 41.3% of years. On water rights, Santa Barbara County lies in the Santa Maria Valley Basin — Adjudicated — Adjudicated 2008 under a stipulated judgment; new appropriation effectively closed to new landowners..

How remote is Santa Barbara County?

A representative private-land location has about 18,505 people within a 30-minute drive and 1,255,536 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.

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

At a glance

Who to call

Do you need a building permit in Santa Barbara County, California?

Who is the Santa Barbara County building department, and how do you reach them?

Does Santa Barbara County have zoning?

How do septic permits work in Santa Barbara County?

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

Building a home in Santa Barbara County: the steps, in order

What to check before you buy land in Santa Barbara County

Watch-outs

Sources

Santa Barbara County in California

How Santa Barbara County scores

Find land. Bring the promising ones back.

Parcel due diligence

Answers from the rulebook for Santa Barbara County

Santa Barbara County rules

California rules that apply here

Still unanswered

Water rights & wells in Santa Barbara County

Living off-grid in Santa Barbara County, California

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

Do you need a building permit in Santa Barbara County, California?

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

How much does land cost in Santa Barbara County, California?

What is the water situation in Santa Barbara County?

How remote is Santa Barbara County?

How Santa Barbara compares in California