Santa Barbara County

ADU Pass helps homeowners in Santa Barbara County, California navigate the permit paperwork for building an accessory dwelling unit. We cover 13 cities and 24 ZIP codes in this county.

24 ZIP codes

13 Cities

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County ADU details

County ADU ordinance

Santa Barbara County (population ~447,000) sits on the south-central California coast between San Luis Obispo County to the north and Ventura County to the east, with the Channel Islands offshore. The county is divided geographically and politically between the South Coast (Santa Barbara, Goleta, Montecito, Carpinteria, Summerland, Hope Ranch) and the North County (Santa Maria, Lompoc, Buellton, Solvang, Guadalupe, Orcutt, Los Alamos, Los Olivos, Santa Ynez, Cuyama). The county seat is Santa Barbara (~88,000); the largest city is Santa Maria (~110,000); other incorporated cities are Lompoc, Goleta, Buellton, Solvang, Carpinteria, and Guadalupe. Major unincorporated communities include Montecito (~9,000, post-2018 Thomas Fire / Montecito debris flow rebuild), Hope Ranch, Mission Canyon, Summerland, Orcutt (~36,000, the largest unincorporated community), Los Alamos, Los Olivos, Santa Ynez, Mission Hills, Vandenberg Village, Mission Canyon, Cuyama, and the Hollister Ranch (~14,500-acre coastal ranch with extraordinary access controls). Vandenberg Space Force Base (~99,000 acres, federal jurisdiction) covers a substantial part of the western county along the coast. The county Board of Supervisors administers ADU permitting in unincorporated territory under California Government Code Sec. 65852.2 (state ADU preemption) and Sec. 65852.22 (JADU preemption), overlaid by California Coastal Commission jurisdiction along the coast (with the Hollister Ranch a uniquely-litigated public-access controversy) and Airport Land Use Commission overlays.

Code citations:

State-floor overlay: California state ADU preemption applies in full to all unincorporated parcels. Coastal Zone parcels still require a Coastal Development Permit (or an appealable equivalent under the certified Local Coastal Program) on top of the state-floor ministerial review. Vandenberg SFB is federal jurisdiction and outside county zoning entirely; the county has no permitting authority on installation parcels. The Hollister Ranch presents a uniquely-litigated public-access regime that affects how Coastal Development Permits are processed on Ranch parcels. AB 976 prohibits owner-occupancy mandates on detached ADUs. AB 2221 / AB 2533 (2022-2023) further constrain local denial grounds.

Adopting body: Santa Barbara County Board of Supervisors (sitting as the Local Coastal Program adopting body for Article II)

County permitting (unincorporated parcels)

The Santa Barbara County Planning and Development Department issues ADU permits for unincorporated parcels including Montecito, Hope Ranch, Mission Canyon, Summerland, Orcutt, Los Alamos, Los Olivos, Santa Ynez, Mission Hills, Vandenberg Village, Cuyama, Hollister Ranch, and the foothill / mountain-canyon parcels. Practical permitting frictions: Coastal Zone Local Coastal Program review on coastal unincorporated parcels (Hollister Ranch, Gaviota Coast, Naples, Summerland, Carpinteria foothills); Hollister Ranch coastal-access litigation regime layered on standard Coastal Development Permit processing; ALUC compatibility review on parcels within airport influence areas; CAL FIRE State Responsibility Area on the Santa Ynez Mountains, San Rafael Mountains, Sierra Madre, and rural foothills with widespread Very High FHSZ designations after the 2017 Thomas Fire / 2018 Montecito debris flow / 2017 Whittier Fire / 2016 Sherpa Fire / 2009 Jesusita Fire history; FEMA SFHA along the Santa Ynez River, Cuyama River, Sisquoc River, and South Coast canyons; post-Montecito debris flow setbacks and geologic hazard overlays on the South Coast foothills; and Vandenberg SFB federal jurisdiction in the western county.

DepartmentSanta Barbara County Planning and Development Department

Address123 East Anapamu Street, Santa Barbara, CA 93101

Phone805-568-2000

Process overview: Standard ministerial 60-day review per Sec. 65852.2(b) for compliant ADU applications on inland parcels under Chapter 35. Coastal Zone parcels require Coastal Development Permit processing or LCP-defined exempt determination under the Coastal Zoning Ordinance (Article II); appeal exposure to the California Coastal Commission applies in the appeal jurisdiction. Hollister Ranch parcels face the unique post-AB 1680 access regime. ALUC compatibility review runs concurrent with building review for parcels within airport influence areas. CAL FIRE clearance, defensible-space sign-off (PRC 4291), county fire department final inspection, and post-Montecito debris-flow geologic review are required for parcels in Very High FHSZ and downslope of recent burn perimeters.

Impact fees: SB 13 fee waivers apply to ADUs under 750 sqft. School-district fees vary widely (Santa Barbara Unified, Goleta Union, Santa Maria-Bonita, Lompoc Unified, Carpinteria Unified, Santa Ynez Valley Union, Cuyama Joint Unified). County road impact fees apply on parcels generating new ADU trips. Coastal Zone planning fees and biological-resource study costs add materially to coastal-parcel ADU project budgets.

County assessor

The Santa Barbara County Assessor maintains parcel-level assessment records for the entire county. ADU additions on residential parcels are assessed at fair market value at completion under standard Prop 13 treatment. South Coast parcels (Santa Barbara, Montecito, Hope Ranch, Summerland, Carpinteria) command extraordinary land-value premiums; ADU improvements on Montecito parcels in particular generate substantial absolute assessment additions. Williamson Act parcels in the Santa Ynez Valley (Solvang / Santa Ynez / Los Olivos / Los Alamos wine country) and the Cuyama Valley carry agricultural-preserve income-capitalization assessment; ADU additions on Williamson Act parcels follow compatible-use criteria. Vandenberg SFB land is federal property and is not on the county assessment roll.

NameSanta Barbara County Clerk-Recorder-Assessor

Address105 East Anapamu Street, Santa Barbara, CA 93101

Phone805-568-2550

Assessment policy: Standard Prop 13 treatment: ADU improvement value added at fair market value at completion, primary structure base-year value preserved with 2 percent annual cap. Williamson Act parcels: agricultural-preserve income-capitalization assessment preserved on contracted cropland; compatible-use ADU improvement value added to residential subarea. Post-Thomas Fire / Montecito debris flow parcels: Sec. 170 calamity reassessment applied to destroyed structures; Prop 50 / Prop 19 base-year transfer for substantially destroyed (50%+) structures allows pre-event base-year value to follow rebuild improvements within statutory timeframes.

County overlays (11)

Santa Barbara County overlays of consequence: California Coastal Zone with certified Local Coastal Program (Article II) covering the South Coast foothills, Gaviota Coast, Naples, Hollister Ranch, and the western coastline; the Hollister Ranch unique coastal-access regime (~14,500 acres, ~136 parcels, decades of public-access litigation); Vandenberg Space Force Base (~99,000 acres of federal jurisdiction in the western county); Channel Islands National Park (offshore, federal); Los Padres National Forest covering the San Rafael / Sierra Madre / eastern Santa Ynez Mountains; ALUC overlays for Santa Barbara Municipal, Santa Maria Public, Lompoc, Santa Ynez airports plus Vandenberg airfields; CAL FIRE State Responsibility Area with widespread Very High FHSZ designations across the Santa Ynez Mountains, San Rafael Mountains, and Sierra Madre after the 2017 Thomas Fire / 2018 Montecito debris flow / 2017 Whittier Fire / 2016 Sherpa Fire / 2009 Jesusita Fire; post-2018 Montecito debris flow geologic-hazard overlays on the South Coast foothills; FEMA SFHA along the Santa Ynez River, Cuyama River, Sisquoc River, and South Coast canyons; Williamson Act / agricultural preserves in the Santa Ynez Valley and Cuyama Valley; Chumash tribal jurisdictions (Santa Ynez Band of Chumash Mission Indians); and the Channel Islands National Marine Sanctuary offshore.

Known county issues (2)

policy-review — Santa Barbara County is one of California's most permitting-complex unincorporated environments. Coastal Zone Local Coastal Program review layers Coastal Development Permit processing on top of the state ADU floor for the Gaviota Coast, Hollister Ranch, Naples, Summerland, and South Coast foothill parcels. Vandenberg SFB federal jurisdiction excludes a large fraction of the western county from county permitting entirely. Post-Thomas / Montecito debris flow geologic-hazard overlays on the South Coast foothills add stacked geologic, fire, and coastal review. The Hollister Ranch coastal-access regime remains unresolved decades into the underlying litigation.
other — Vandenberg SFB launch operations periodically restrict access to coastal portions of the installation buffer (Highway 1 closures, Coast Road closures, evacuation of Surf Beach and Wall Beach, Amtrak Coast Starlight delays). ADU construction on parcels within launch-hazard exclusion zones may face episodic site-access constraints during launch windows that do not exist for non-buffer parcels.

California state — ADU law and programs

State ADU law

California has the most aggressive statewide ADU preemption regime in the US, built from ~15 bills passed 2019-2025 and enforced by the Department of Housing and Community Development (HCD). The 2026 HCD ADU Handbook addendum (in effect with the 2025 Title 24 code cycle) is the operative state-level reference. The regime does four things at once: (1) preempts local zoning that would ban or unreasonably restrict ADUs; (2) imposes by-right ministerial approval with short statutory deadlines; (3) caps fees and utility-connection charges; and (4) empowers HCD to void non-compliant local ordinances.

State HOA preemption

California has the strongest statewide HOA-preemption regime in the US for accessory dwelling units, built from two bills: AB 670 (2019) voided ADU-prohibiting covenants on single-family residential lots, and AB 3182 (2020) extended and codified the preemption into the Davis-Stirling Common Interest Development Act (Civil Code §§ 4740 / 4741). The combination prohibits common-interest communities from banning ADUs, restricting rentals below 25% of separate interests, or treating ADUs as separate HOA interests. Limits remain: HOAs retain authority over reasonable design standards and statutory height limits, and the 2026 Carlsbad case (CalMatters coverage) established that an HOA's documented design-standards regime can effectively delay or constrain ADU approval short of outright prohibition.

State financing programs

California's flagship state-level ADU financing program — the CalHFA ADU Grant Program — is paused and has not been refunded since the original $100 million allocation was fully deployed 2023-12-28. The program provided up to $40,000 per qualifying homeowner for pre-construction and non-recurring closing costs and financed approximately 2,500 ADUs in two rounds. As of 2026-04, no new funding round has been announced in the state budget. CalHFA continues to publish anti-scam warnings because bad actors actively solicit homeowners claiming access to grant funds that no longer exist. State-level financing activity has shifted to local pilot programs (San Francisco, San Jose, Los Angeles, San Diego) and private financing products (Fannie Mae ADU mortgage, HELOC, construction-to-permanent).

CalHFA ADU Grant Program
HCD ADU Funding index

State housing programs

California's state-level ADU programs are concentrated at HCD (technical guidance, ordinance review, enforcement) and the paused CalHFA grant pipeline (covered under stateFinancing). The state does not operate a central pre-approved ADU plan library — instead, AB 1332 (2024) created a preemption framework for local pre-approved plans with a 30-day ministerial-approval deadline, and major cities (Los Angeles, San Diego, San Jose, Sacramento, Berkeley) have rolled out their own plan catalogs. The California YIMBY coalition and other housing-policy organizations play an influential role in bill drafting; they are not state agencies but effectively drive much of the ADU legislative agenda. The Title 24 code cycle (now 2025, in effect for 2026 permits) is the authoritative building-code baseline.

Federal (United States) — ADU-relevant rules and programs

Federal ADU law

The United States has no federal statute that directly regulates accessory dwelling unit entitlement or design. Land-use authority over ADUs resides with states and local governments under the traditional police power. Federal engagement is limited to financing (Fannie/Freddie/FHA/VA/USDA), flood insurance (FEMA/NFIP), and discretionary housing programs (HUD), which are recorded in sibling sections of this file.

Federal financing programs

Federal housing-finance agencies and GSEs set nationwide underwriting rules that govern whether an ADU can be financed, appraised, and counted toward mortgage qualifying income. The relevant actors are Fannie Mae, Freddie Mac, FHA (HUD), VA, and USDA Rural Development.

Federal tax credits

There is no ADU-specific federal tax credit. ADUs may incidentally qualify for existing federal energy-efficiency and clean-energy tax credits when the ADU construction includes qualifying measures.

Federal housing programs

HUD administers several discretionary programs that can fund ADU-related activity at the grantee's election, but none is an ADU-specific program.