ADU Pass
Jacumba
ADU Pass helps homeowners in Jacumba, San Diego County, California navigate the permit paperwork for building an accessory dwelling unit. This area covers 1 ZIP code.
ADU details
ADU legality: allowed
Allowed by-right ministerial under California state law via San Diego County PDS. Standing fire / very-high-FHSZ / water-supply / WUI overlays apply throughout the Jacumba CDP. The JVR Energy Park (90 MW solar + 70 MW/280 MWh battery, fall 2026 commissioning) on adjacent acreage east of the village does not directly affect ADU permit pathways but introduces construction-truck traffic and viewshed considerations on parcels along Old Highway 80.
Cost scenarios
| Scenario | Sq ft | Permit | Build | Total |
|---|---|---|---|---|
| minimum | 150 | $1,730 | $49,500 | $51,230 |
| 600 | 600 | $2,010 | $198,000 | $200,010 |
| midpoint | 675 | $2,080 | $222,750 | $224,830 |
| maximum | 1,200 | $3,770 | $396,000 | $399,770 |
Fee breakdown (as of 2026-04)
Permitting process
- (~2d)
- (~5d)
- (~1d)
- (~38d)
- (~14d)
- (~21d)
- (~3d)
Viability (permitted uses)
- Long-term rental: yes Long-term rental by-right on County parcels; California owner-occupancy preemption since 2024.
- Short-term rental: with-restrictions STR market in Jacumba is meaningfully driven by hot-springs spa visitors, Anza-Borrego desert wildflower season (March-April), and the small but persistent border-region traffic. The reopened Jacumba Hot Springs Resort and the historic spa-town identity support nightly-rate STRs. County STRO ordinance does not apply to unincorporated areas.
- Office rental: with-restrictions External office tenant rental requires a Minor Use Permit / home-occupation review.
- Home office: yes Owner home-occupation permitted under standard County rules.
- Studio / workshop: yes Personal artist / workshop use of ADU permitted as accessory residential use. The desert-light and clear-sky conditions in Jacumba have historically attracted artist studios.
- Agriculture: with-restrictions Outlying Jacumba parcels are A70 / A72 agricultural-zoned; ADU is a permitted residential accessory.
- Relative support: yes Multigenerational / relative-occupancy ADU permitted. Rev. & Tax. Code 74.3 Claim for parent/child intergenerational housing applies.
Incentives
- Unincorporated green-design fee discount (7.5% off PDS permit-related fees) — PDS unincorporated green-incentive fee waiver: 7.5% off plan-review and permit fees for projects meeting CALGreen Tier 1 / equivalent voluntary green standards.
- ADU separate-sale condo conversion program (post-March 2026) — Effective April 4, 2026: County-fee Jacumba parcels may map ADUs as condominiums for separate sale under AB 1033.
Pre-approved plans Pre-approved plans · 9 free designs · saves ~4 weeks
Contacts
Staff: PDS Zoning Permit Counter (ADU pre-application zoning consult (Jacumba CDP County-fee parcels)) PDSZoningPermitCounter@sdcounty.ca.gov, Jacumba Community Sponsor Group (JCSG) (Advisory body to County PDS for Jacumba CDP land-use matters; meets 2nd Monday of each month; PO Box 792, Pine Valley, CA 91962), Jacumba Community Services District (Water service provider for Jacumba village-core parcels at 1266 N. Railroad St., Jacumba CA 91934; partners with Descanso Community Water District), CAL FIRE / San Diego County Fire — East County Battalion (Defensible space, WUI Chapter 7A review for Jacumba CDP parcels), San Diego County Department of Environmental Health & Quality (DEHQ) (Septic / well permitting for Jacumba parcels off the CSD water system)
Utilities
- Water: Jacumba Community Services District (water only) at 1266 N. Railroad St., Jacumba CA 91934, phone 619-766-4359 — covers the village-core service area; outlying parcels rely on private wells permitted by DEHQ · 28d connect · $4,800
Jacumba CSD provides water service only (no sewer service from the district); office hours Monday-Thursday 9am-2pm. CSD partners with Descanso Community Water District for some operations. Outlying desert parcels north and east of the village rely on private wells; aquifer yield is parcel-specific in the Jacumba Valley basin. - Sewer: On-site septic via San Diego County DEHQ permit (no public sewer in the Jacumba CDP — Jacumba CSD is water-only) · 28d connect · $13,500
All Jacumba ADUs require an engineered or conventional septic system. Soil profile in the Jacumba Valley basin is mixed decomposed granite + sand-loam; perc-test results are highly parcel-specific. Some older village-core parcels use shared cesspool systems that must be upgraded to engineered septic when adding an ADU. - Electric: San Diego Gas & Electric (SDG&E) — service drop from the regional 138 kV / 69 kV distribution serving the Boulevard / Jacumba substation cluster · 28d connect · $3,800
Jacumba sits on the same hardened SDG&E transmission backbone serving Boulevard, Campo, and the regional renewable portfolio. PSPS (Public Safety Power Shutoff) exposure is significant during fall fire-weather events; PV+battery is increasingly common on Jacumba parcels. The fall-2026 JVR Energy Park interconnects to this same infrastructure.
Property values & taxes
Construction timeline
Realistic total: best 9mo · typical 14mo · worst 20mo
Lead times in Jacumba are longer than Campo given the smaller contractor pool (most GCs travel from El Cajon ~75 mi or Calexico/El Centro ~50 mi via I-8). CBC Chapter 7A WUI envelope sequence adds ~2 weeks vs non-fire-zone build. Material delivery from El Cajon supply yards is ~75 mi each way. JVR Energy Park construction labor demand through fall 2026 may extend lead times further as union electricians and steel crews compete for regional capacity.
Modular pathway inspectors are occasional with modular
Financing
State ADU loans:
- CalHFA ADU Grant Program (California Housing Finance Agency)
- California HCD ADU Funding clearinghouse (California Department of Housing and Community Development)
Insurance impact
HOA prevalence & preemption
Jacumba's HOA prevalence is very low. Most parcels are rural-residential, agricultural, or village-core townsite without covenant administration. The historic 1920s-era townsite plat predates modern HOA structures. CA AB 670 / AB 3182 preempt HOA ADU prohibitions where HOAs do exist.
Regulatory overlays (4)
- wui-fire-zone
Jacumba CDP parcels are predominantly mapped Very High Fire Hazard Severity Zone in the CAL FIRE State Responsibility Area. CBC Chapter 7A WUI construction is the operating design assumption: Class A roof, ignition-resistant siding, dual-pane windows, 1/8-inch vent screens, non-combustible eaves. 100-foot defensible space (PRC 4291) and minimum fire-flow water supply (cistern + 2,500 gpm or NFPA 13D sprinkler tradeoff) apply outside Jacumba CSD service areas. - other
US-Mexico border adjacency overlay: Jacumba village sits ~1 mile north of the international border; the Tecate Port of Entry is ~24 mi west via I-8 / SR-188. Federal Border Patrol (USBP El Centro Sector) has significant presence; cross-border infrastructure (border wall maintenance, surveillance towers) shapes the southern viewshed. Old Highway 80 was the historic transcontinental US route through Jacumba. - other
JVR Energy Park overlay (operational fall 2026): 643-acre, 90 MW solar + 70 MW/280 MWh battery facility immediately east of the village along Old Highway 80. Construction-truck traffic through 2025-2026; long-term viewshed change to the east; battery-fire risk is part of the new local-hazard profile though setback distances mitigate parcel-level exposure. - historic-district
Jacumba historic spa-town visual character: Old Highway 80 / former SD&AE rail-corridor visual envelope and remnants of the 1920s-era Hotel Jacumba public baths. ADU permits in the village core may receive heightened design review under Jacumba Subregional Plan visual-resource policies.
Technical envelope (climate & building code)
Climate & energy code
Building code
Amendments:
- Amendment
- Amendment
- Amendment
Contractor market (aggregate)
Legal history (timeline)
Current ordinance: San Diego County Code Title 6 (Zoning Ordinance) — Accessory Dwelling Unit provisions, as amended by Ord. 10693 (2020), Ord. 10749 (2023), and the March 2026 separate-sale program; layered with the Jacumba Subregional Plan within the Mountain Empire Subregional Plan, adopted 2020-08-26, last amended 2026-03-04
- 1880-02-27 — Jacumba Massacre marks contact-era Kumeyaay-rancher conflict (other)
Fifteen Kumeyaay and one White settler died in an event connected to alleged cattle rustling on February 27, 1880. The episode is foundational to the village's documented Indigenous-and-settler history that the Jacumba Subregional Plan acknowledges as a baseline for cultural-resource consideration.
Effect: Cultural-resource sensitivity baseline for parcels within the historic village core; archaeological survey may be triggered for ground disturbance on previously-undisturbed parcels in the Jacumba CDP. - 1919-01-01 — San Diego & Arizona Eastern (SD&AE) rail service reaches Jacumba (other)
Rail service on the SD&AE 'Impossible Railroad' connected Jacumba to San Diego in 1919, enabling the village's spa-tourism boom.
Effect: Rail-corridor heritage along Old Highway 80 / former SD&AE alignment is part of Jacumba's historic-resource context. ADU projects within the visual envelope of the historic village core may receive heightened design review under Subregional Plan visual-resource policies. - 1925-01-01 — Hotel Jacumba opens as world-class spa destination (other)
The Hotel Jacumba opened by 1925 to capitalize on the 104 F Jacumba mineral hot spring. The hotel was destroyed by arson in 1983.
Effect: Defines the 'spa town' identity that the Subregional Plan still references as core community character. Properties in the historic village core carry tourism-related land-use expectations that influence STR demand and ADU conversion economics. - 1979-01-03 — Jacumba Subregional Plan adopted (within Mountain Empire Subregional Plan, Part XX of County General Plan) (city-ordinance)
The Jacumba section of the Mountain Empire Subregional Plan was adopted January 3, 1979 as part of the County General Plan. Establishes community-scale land-use designations governing rural-residential, commercial, and visitor-serving uses within the Jacumba CDP.
Effect: Foundation document for ADU siting on County-fee parcels in Jacumba. Subregional Plan visual-resource and historic-character policies apply to the village core; outlying desert parcels are governed by the broader rural-residential designations. - 2013-08-13 — Jacumba CDP renamed 'Jacumba Hot Springs' by USPS / community petition (city-ordinance)
The community petitioned for and received a USPS rename to 'Jacumba Hot Springs' in 2013, restoring the historic spa-town identity to the official place name.
Effect: Affects mailing-address records and some County listings. Permit applications may carry either 'Jacumba' or 'Jacumba Hot Springs' depending on submission date; both refer to the same CDP. - 2020-08-26 — San Diego County Ord. No. 10693 — ADU ordinance conforming to AB 68 / AB 881 / SB 13 (county-ordinance)
Conformance update to 2019 statewide ADU reform package. Applies to Jacumba CDP County-fee parcels.
Effect: Established ministerial 60-day permit review, removed impact fees on ADUs under 750 sqft, codified state minimum sizes. - 2021-08-18 — Board of Supervisors approves JVR Energy Park (Major Use Permit MUP-18-022) (other)
Board voted 5-0 to approve the 643-acre, 90 MW solar + 70 MW/280 MWh battery JVR Energy Park east of Jacumba village despite significant community opposition from the Jacumba Community Sponsor Group and residents. BayWa r.e. is the project sponsor; project secured $416M financing in December 2025 and is expected to be operational in fall 2026.
Effect: JVR construction-truck traffic on Old Highway 80 / I-8 throughout 2025-2026 affects ADU project logistics in the Jacumba village core. Long-term: the project changes the eastern viewshed and is the dominant infrastructure landmark adjacent to the village. - 2023-12-06 — San Diego County Ord. No. 10749 — ADU ordinance update for AB 2221 / SB 897 (county-ordinance)
Conformance update incorporating 2022 statewide ADU clarifications.
Effect: Tightened review-clock administration; clarified what County PDS can require during plan check on Jacumba CDP parcels. - 2026-03-04 — San Diego County adopts AB 1033 separate-sale ADU condo-conversion program (county-ordinance)
Board of Supervisors voted 5-0 on March 4, 2026 to adopt ADU condo-conversion program for unincorporated communities. Effective April 4, 2026.
Effect: Available to County-fee parcels in the Jacumba CDP. May open new exit-financing pathways for ADU investors in the village core.
Known issues (4)
- other — Inspector-travel bottleneck — PDS field inspectors travel ~75 mi each way from Kearny Mesa, which extends inspection windows and adds reschedule risk on rough-in / framing inspections. Coordination with neighboring inspections (Boulevard, Campo) helps but doesn't eliminate the issue.
- other — VHFHSZ insurance market: nearly all admitted-carrier homeowners insurance has been non-renewed in 91934; most Jacumba owners are on CA FAIR Plan + DIC wraps. ADU adds modest incremental premium on what's already a difficult policy environment.
- other — JVR Energy Park construction labor demand through fall 2026 is competing for regional steel, electrical, and earthwork capacity, extending ADU project lead times in eastern San Diego County by ~2-4 months relative to 2024 baselines.
- other — Border-corridor logistics: I-8 corridor and Old Highway 80 have unpredictable border-related traffic enforcement (USBP checkpoints) that can affect material delivery timing.
San Diego County — county ADU rules and overlays
County ADU ordinance
San Diego County regulates ADUs on parcels in the unincorporated county under Title 6 of the County Code (Zoning Ordinance), Sections 6156.x. The county's ADU framework layers on top of California Government Code sections 65852.2 (ADU) and 65852.22 (JADU), which preempt many local standards statewide; the county ordinance fills in the locally-controlled parameters (setbacks, design standards, parking in non-transit unincorporated areas, fire-safe design in VHFHSZ) that state law leaves to local choice. The current ordinance reflects amendments adopted 2020 (Ord. No. 10693) and 2023 (Ord. No. 10749) to conform with AB 68 / AB 881 (2019), AB 976 (2019 owner-occupancy elimination through 2024), SB 13 (2019 fee reductions), AB 2221 / SB 897 (2022 design/permit clarifications), and AB 1033 (2023 condo-ADU optional program; San Diego County has not opted into AB 1033 condo separation as of 2026-04-20). The county permits up to one ADU plus one JADU per single-family parcel by right, and the state-mandated two ADUs per multifamily lot; parking is not required on ADUs within 1/2 mile of transit. The county's distinct contributions on top of state law are the fire-hardening / defensible-space design standards for ADUs sited in Very High Fire Hazard Severity Zones, the airport-noise compatibility review for ADUs within Airport Land Use Compatibility Plan (ALUCP) zones, and the Coastal Development Permit (CDP) requirement for ADUs in the county's certified Local Coastal Program (LCP) jurisdiction.
- San Diego County Code of Regulatory Ordinances Title 6 (Zoning) — Accessory Dwelling Unit provisions
- PDS ADU Technical Bulletin and applicant handouts
- Ordinance No. 10693 — 2020 ADU ordinance conforming to AB 68 / AB 881 / SB 13
- Ordinance No. 10749 (approximate) — 2023 ADU ordinance update for AB 2221 / SB 897 / AB 1033
State-floor overlay: California state law (Gov. Code 65852.2, 65852.22) preempts most local ADU regulation. The state sets ministerial-approval requirements, caps fees, mandates 60-day permit review, forbids local owner-occupancy requirements through 2024 (extended effectively through AB 976 / subsequent amendments), sets minimum allowed sizes (850 sqft one-bedroom, 1000 sqft two-bedroom), forbids parking requirements within 1/2 mile of transit or on replacement-covered-parking ADUs, and caps impact fees at zero for ADUs under 750 sqft. San Diego County's ordinance reiterates and applies these floors, adding only the locally-controlled fire, airport, and coastal overlays. Where a project is in a VHFHSZ or coastal-commission jurisdiction, state ADU preemption still applies to the ADU allowance itself but does not preempt the county's separate fire and coastal authority over site-design standards.
County regulatory overlays
San Diego County administers or co-administers several overlay regimes that materially affect ADU siting on unincorporated parcels: (1) the California Coastal Commission's jurisdiction along the coastal zone (a narrow band up to 5 miles inland in some places), implemented through the county's certified Local Coastal Program (LCP) covering unincorporated coastal segments; (2) Very High Fire Hazard Severity Zones (VHFHSZ) designated by CAL FIRE and reviewed by the State Board of Forestry, which cover very large portions of the unincorporated back-country and drive defensible-space, ignition-resistant-construction, and access requirements; (3) FEMA Special Flood Hazard Areas (SFHA) along the San Diego River, San Dieguito River, San Luis Rey River, Otay River, Sweetwater River, Tijuana River, and associated coastal zones; and (4) Airport Land Use Compatibility Plans (ALUCP) administered by the San Diego County Regional Airport Authority's Airport Land Use Commission around MCAS Miramar (federal military), NAS North Island / Naval Outlying Landing Field Imperial Beach (federal military), Gillespie Field (Santee, county-owned), McClellan-Palomar (Carlsbad, county-owned), Brown Field (Otay Mesa, City of San Diego), Montgomery-Gibbs Executive (Kearny Mesa, City of San Diego), Ramona Airport (county-owned), Fallbrook Community Airpark (county-owned), Oceanside Municipal, and Jacumba Airport. Seismic-retrofit overlays are not a county-administered regime in San Diego (unlike parts of Los Angeles / San Francisco); California seismic building-code compliance applies statewide through the California Building Code adopted by the county.
- California Coastal Commission / County Local Coastal Program (LCP) — The county's LCP covers the unincorporated coastal segments near Del Mar Mesa, Torrey Pines extensions, Crest / Harmony Grove (tributary areas), and the Camp Pendleton / Oceanside boundary. An ADU within the coastal zone requires a Coastal Development Permit (CDP) unless categorically excluded; most single detached ADUs qualify for an Administrative CDP (noticed but ministerial-like) while those in sensitive-biological or visually-sensitive settings may require a heard CDP. The Coastal Commission retains appeal jurisdiction over county CDPs within the defined appeals area. State law (Gov. Code 65852.2(j)) preserves the CDP requirement for ADUs in the coastal zone notwithstanding the otherwise-ministerial state ADU framework.
- CAL FIRE / State Board of Forestry Very High Fire Hazard Severity Zones (VHFHSZ) and County Fire Code — Very large portions of unincorporated San Diego County — most of the East County back-country including Julian, Warner Springs, Descanso, Pine Valley, Jacumba, Campo, Boulevard, Dulzura, Potrero, Palomar Mountain, Cuyamaca, and the San Diego / Cleveland National Forest interface — are designated VHFHSZ in either the State Responsibility Area (SRA) or the county's Local Responsibility Area (LRA). An ADU in a VHFHSZ must comply with California Building Code Chapter 7A (WUI-rated exterior materials: ignition-resistant siding, dual-pane windows, 1/8-inch-max vent screens, Class A roofing, non-combustible eaves / soffits / decks), minimum 100-foot defensible-space per Pub. Res. Code 4291, minimum driveway width and turnaround per fire-district standards, and minimum fire-flow water supply (2,500 gpm residential standard, reduced for sprinklered ADUs per Sec. R313). CAL FIRE or the local FPD (Alpine, Bonita-Sunnyside, Deer Springs, Julian-Cuyamaca, Lakeside, North County, Pine Valley, Rancho Santa Fe, Rural FPD of San Diego County, Valley Center, etc.) reviews the ADU permit. The 2025 wildfire season reinforced these requirements; no county-wide moratorium has been imposed, but permit backlogs lengthen post-fire when affected areas surge rebuild applications.
- FEMA Special Flood Hazard Areas (SFHA) — National Flood Insurance Program — The county administers FEMA NFIP floodplain regulations for unincorporated parcels. Principal SFHA extents are along the San Luis Rey River (Bonsall, Pala, Pauma), San Dieguito River (Lakeside, Ramona uplands), San Diego River (Lakeside, Santee extensions), Sweetwater River (Spring Valley extensions), Otay River (Jamul, Dulzura, Otay Mesa extensions), and Tijuana River estuary (Tijuana / Imperial Beach extensions). ADUs in an SFHA require lowest-floor elevation to or above Base Flood Elevation plus 1 ft county freeboard, flood vents on enclosures below BFE, anchoring, and a post-construction Elevation Certificate. 2024-2025 saw several FEMA FIRM revision studies for Otay, San Luis Rey, and Sweetwater watersheds; owners should confirm current effective panel before design.
- Airport Land Use Compatibility Plans (ALUCP) — San Diego Regional Airport Authority ALUC — The San Diego County Regional Airport Authority serves as the ALUC for all airports in the county. ALUCP airport influence areas (AIAs) extend roughly 2-5 miles beyond each airport depending on runway configuration and establish safety zones (Zones 1-6) and noise contours (60/65/70 dB CNEL). Principal ALUCP overlays affecting unincorporated parcels are MCAS Miramar (extensive AIA covering Scripps Ranch fringes, Miramar Ranch North, Tierrasanta approaches, into unincorporated Rancho Santa Fe / Poway fringes), Gillespie Field (AIA extending into unincorporated Lakeside, El Cajon fringes, Bostonia), McClellan-Palomar (Carlsbad-adjacent unincorporated areas), Ramona Airport (large rural AIA), and Fallbrook Community Airpark (Bonsall / Fallbrook). An ADU in a safety zone may face density restrictions, CC&R / avigation-easement recording requirements, and noise-attenuation construction standards (STC-rated windows, forced-air HVAC with acoustic treatment). The ALUC reviews county-referred projects; in a safety-zone conflict the county may override only by a super-majority Board vote per PUC 21676.
- San Diego County Biological Mitigation Ordinance / Multiple Species Conservation Program (MSCP) — The county's MSCP covers south county unincorporated areas and establishes Pre-Approved Mitigation Areas and a Biological Mitigation Ordinance that triggers biological review for grading and construction in designated preserve-land overlays. An ADU outside the existing dwelling footprint that requires grading in a designated MSCP preserve or Biological Resource Core / Linkage area will trigger a biological review / mitigation obligation on top of the ministerial ADU permit. Inside a parcel's previously-disturbed building envelope the MSCP typically does not add requirements. The East County MSCP Subarea Plan remains pending final approval as of 2026-04-20.
County permitting (unincorporated parcels)
The County of San Diego Planning & Development Services (PDS) department is the single-point-of-contact for ADU permits on parcels in the unincorporated county. Unincorporated San Diego County covers approximately 3,570 square miles (about 79% of the county's 4,526 sqmi land area) and includes densely developed fringe areas (Ramona, Alpine, Lakeside, Spring Valley, Fallbrook, Valley Center), rural back-country (Julian, Warner Springs, Jacumba, Boulevard, Campo), and tribal lands (which are not county-permitted). The 18 incorporated cities (San Diego, Chula Vista, Oceanside, Escondido, Carlsbad, Vista, San Marcos, El Cajon, Santee, La Mesa, Encinitas, National City, Poway, Coronado, Imperial Beach, Lemon Grove, Del Mar, Solana Beach) permit their own ADUs independently. PDS combines planning / zoning review, building plan review, grading / drainage review, fire-district referral (most unincorporated areas are served by CAL FIRE / County Fire Authority or a local Fire Protection District rather than a city fire department), and environmental review (CEQA applicability is normally exempt for ministerial ADUs per Gov. Code 65852.2(f) and Pub. Res. Code 21080(b)(8)).
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).
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.
ZIP Code
- 91934
Post Office
- 1209 N Railroad St, 91934