ADU Pass
Warner Springs
ADU Pass helps homeowners in Warner Springs, San Diego County, California navigate the permit paperwork for building an accessory dwelling unit. This area covers 2 ZIP codes.
Map
ADU details
ADU legality: allowed
Permitted by-right ministerial review through County PDS. Practical constraints in Warner Springs are dominated by extreme remoteness, very-high fire hazard, Cleveland National Forest adjacency, and limited utility infrastructure rather than ordinance friction.
Cost scenarios
| Scenario | Sq ft | Permit | Build | Total |
|---|---|---|---|---|
| minimum | 400 | $4,400 | $220,000 | $224,400 |
| 600 | 600 | $6,200 | $348,000 | $354,200 |
| midpoint | 800 | $8,000 | $480,000 | $488,000 |
| 1200 | 1,200 | $13,500 | $720,000 | $733,500 |
Fee breakdown (as of 2026-04)
Permitting process
- Pre-application research at County PDS (~10d)
Confirm parcel zoning (RR-4/RR-8/RR-20/A70/A72) on County GIS (SanGIS); verify Warner Springs Community Plan land-use designation; check FHSZ map (most of Warner Springs is VHFHSZ-SRA); review Cleveland National Forest adjacency, Los Coyotes Indian Reservation boundary, and access road status. - Septic perc test + well evaluation + fire-flow water-storage planning (~45d)
Almost all Warner Springs parcels rely on private septic and private wells. DEH percolation test and well water-quality testing required; on-site water storage tank for fire flow specified by County Fire / CAL FIRE if hydrant flow inadequate. - Submit ADU application via PDS Online (Accela) (~1d)
Electronic submittal at publicservices.sandiegocounty.gov - PDS Accela Citizen Access. Submittals include site plan with defensible-space zones, floor plans, elevations, Title 24, structural calcs, septic/well documentation, fire-flow analysis. - Completeness check (15 business days statutory) (~15d)
PDS Zoning Permit Counter screens for completeness within 15 business days per state-law deemed-complete requirement. - Multi-department plan review with extended fire review (~60d)
Concurrent review by PDS Building, PDS Zoning, DEH (septic/well), County Fire Authority + CAL FIRE Warner Springs Station (defensible space, Chapter 7A, ingress/egress), Public Works (rural access). VHFHSZ + CWPP designation extends fire review beyond standard. - Permit issuance (~7d)
Fees paid (impact fees over 750 sqft only). Building permit issued. Statutory ministerial limit is 60 days from complete application; staff turnaround in backcountry casework can lag at the permit-issuance step. - Construction inspections
Foundation, framing, MEP rough, insulation, drywall, septic install, fire-defensible-space verification, final. Inspector travel time from Kearny Mesa is significant; combined inspections typical to limit trips. - Certificate of occupancy (~10d)
DEH septic clearance + Building final + Fire defensible-space sign-off issues CO; ADU may be occupied or rented.
Viability (permitted uses)
- Long-term rental: yes (San Diego County Zoning Ordinance) 30+day rental of ADU permitted by-right; AB 976 prohibits owner-occupancy condition. Long-term rental demand is thin given remoteness; resort/ranch staff and PCT-adjacent caretakers are the typical tenant base.
- Short-term rental: with-restrictions (San Diego County Code Title 2 Division 1 Chapter 1A (STRO ordinance, 2023)) Warner Springs has notable seasonal STR demand from Pacific Crest Trail through-hikers (Mile 109 PCT trail town), Warner Springs Ranch resort overflow, gliderport visitors, and Anza-Borrego desert travelers. Tier-2 STRO rules cap whole-home STR licenses.
- STR registration required with County
- Transient Occupancy Tax remittance
- Tier-2 area restrictions in remote unincorporated zones
- Office rental: no ADU classified as dwelling unit - cannot be leased as commercial office space.
- Home office: yes Home occupations permitted in residential zones; remote-work viability constrained by limited rural broadband (some Starlink dependency).
- Studio / workshop: yes Personal artist/workshop use is a permitted accessory residential use; the area attracts artists drawn to the high-desert landscape.
- Agriculture: yes Many Warner Springs parcels are A70 or A72 agricultural; right-to-farm protections apply. Cattle ranching, horse properties, and limited orchards are common; ADU itself remains residential.
- Relative support: yes Family-occupancy ADU explicitly permitted; multigenerational ranch arrangements are common.
Incentives
- CalHFA ADU Grant Program — $40,000 one-time (when funded) (Income-qualified County homeowners; reimburses pre-construction soft costs)
- SB 13 Impact Fee Waiver (under 750 sqft) — California state law prohibits impact, capacity, or connection fees on ADUs under 750 sqft. Applies to County PDS permitting in Warner Springs.
Pre-approved plans San Diego County PDS Standard ADU Plans (administered countywide for unincorporated areas including Warner Springs) · 6 free designs · 30% plan-review fee waiver · saves ~4 weeks
Contacts
Staff: PDS Zoning Permit Counter (Zoning intake / completeness review), Department of Environmental Health (DEH) - Land & Water Quality (Septic / well permit review), CAL FIRE - Warner Springs Station 16 (Defensible-space + Chapter 7A inspection), Los Tules at Warner Springs Fire Safe Council (Community CWPP coordination)
Utilities
- Water: Private wells (predominant); Warner Springs Ranch CSA water service serves resort/historic area; Los Coyotes Tribal water for adjacent tribal land · 90d connect · $22,000
- Sewer: Private septic - no centralized sewer service in Warner Springs · 75d connect · $22,000
- Electric: San Diego Gas & Electric (SDG&E); large SDG&E substation at Hwy 79 / S2 junction supplies the region · 90d connect · $5,500
- Gas: Propane (LPG) - no natural gas mains in Warner Springs; Suburban Propane and AmeriGas serve the area · 21d connect · $3,200
Property values & taxes
Market rent by ADU size
| Sq ft | Rent |
|---|---|
| 400 | $1,300/mo |
| 600 | $1,650/mo |
| 800 | $1,950/mo |
| 1,200 | $2,350/mo |
Construction timeline
Realistic total: best 12mo · typical 18mo · worst 30mo
Backcountry GC supply is thin - few contractors travel beyond Ramona/Julian for ADU work. Well-drilling lead times (6-12 weeks), septic perc + DEH approvals, and SDG&E PSPS-compliant electrical service drive the long worst-case. Defensible-space brushing on multi-acre parcels often dictates phasing.
Modular pathway California HCD Factory-Built Housing Program · inspectors are novice with modular · 2 modular permits (last 24mo)
Hwy 79 and S2 corridor have winding mountain grades; module width and turning radius restrictions are real. Long, narrow rural driveways often need gravel-access upgrades for 80,000 lb crane.
Financing
State ADU loans:
- CalHFA ADU Grant Program (California Housing Finance Agency) up to $40,000
- HCD ADU Funding Resources Index (California Department of Housing and Community Development)
Insurance impact
Voluntary-market insurer flight from Warner Springs is severe - California FAIR Plan + DIC wrapper is the typical structure. Premium delta on an ADU here can be 2-3x what it would be in central San Diego.
HOA prevalence & preemption
Warner Springs is overwhelmingly fee-simple rural-residential and ranching; HOA prevalence is among the lowest in San Diego County. Some scattered Warner Springs Ranch resort-area parcels carry CC&Rs.
Regulatory overlays (5)
- wui-fire-zone — Essentially all of Warner Springs is mapped Very High Fire Hazard Severity Zone (State Responsibility Area); Cleveland National Forest, Aguanga, and Hellhole Canyon area adjacency · +45d · +18% cost
CBC Chapter 7A required: Class A roof, ember-resistant vents, ignition-resistant siding, 100-ft defensible space (Zone 0/1/2). On-site fire-flow water storage typically required. PRC 4291 enforcement by CAL FIRE Warner Springs Station 16. (map) - flood-zone — FEMA SFHA Zone A along Agua Caliente Creek, San Felipe Creek, and Warner Valley drainages · +14d · +6% cost
Elevation Certificate required in SFHA; flood vents on enclosed below-base areas; flood insurance required for federally-backed financing. (map) - seismic-retrofit-zone — Warner Springs is roughly 5-8 miles from the Elsinore Fault Zone (Coyote Mountain segment); San Jacinto Fault zone exposure to the east · +14d · +5% cost
Seismic Design Category D per ASCE 7. Alquist-Priolo Earthquake Fault Zoning Act applies to parcels astride mapped fault traces - geotech investigation required. (map) - historic-district — Warner Springs Ranch Resort and Warner's Ranch (NHL designation - Warner-Carrillo Ranch House on Warner Springs Ranch property) · +30d · +10% cost
ADUs on parcels within or visible from the National Historic Landmark viewshed may receive cultural-resources review. Warner-Carrillo Ranch House is a nationally significant adobe site. (map) - other — San Diego County Resource Protection Ordinance (RPO); MSCP North County Plan; Cleveland National Forest boundary parcels with USFS interface requirements · +28d · +9% cost
Sensitive habitat (oak woodland, riparian, vernal pool), steep slope (25%+), and tribal cultural resources (Los Coyotes Indian Reservation adjacency) drive biological/cultural survey costs. (map)
Technical envelope (climate & building code)
Climate & energy code
Building code
Amendments:
- San Diego County Building Regulations (Title 9 Division 1) — County local amendments; includes wildfire defensible-space coordination with CAL FIRE.
- CBC Chapter 7A - Wildland-Urban Interface — Required across Warner Springs (VHFHSZ-SRA) - ignition-resistant assemblies.
Contractor market (aggregate)
Legal history (timeline)
Current ordinance: San Diego County Zoning Ordinance - Accessory Dwelling Units (administered by PDS for Warner Springs), adopted 2017-11-15, last amended 2026-03-04
- 2017-11-15 — San Diego County Zoning Ordinance ADU Amendment (Ord. 10532) (county-ordinance)
County PDS' first comprehensive overhaul of unincorporated ADU rules to align with California's 2017 ADU bills (SB 1069 / AB 2299).
Effect: Adopted by-right ADU permits in unincorporated single-family zones including Warner Springs; replaced minor-use-permit pathway with ministerial review. - 2019-09-01 — Los Tules at Warner Springs Community Wildfire Protection Plan (CWPP) signed (other)
Warner Springs CWPP formally adopted by Los Tules at Warner Springs Fire Safe Council, classifying the community within Very High or High fire-hazard area covering ~40 sq mi.
Effect: Reinforced defensible-space, ingress/egress hardening, and Chapter 7A enforcement priorities for any new construction in Warner Springs - including ADUs. - 2020-08-12 — San Diego County PDS ADU Conformance Amendment (county-ordinance)
Amended unincorporated ADU code to align with 2020 California ADU statute changes (AB 68, AB 881, SB 13, AB 670).
Effect: Removed owner-occupancy condition for ADUs in unincorporated Warner Springs; codified 60-day ministerial deadline; aligned size envelopes with state minimums. - 2024-01-01 — AB 976 (2023) - Permanent prohibition on owner-occupancy (state-law)
Permanently bars California cities and counties from imposing owner-occupancy requirements as a condition of ADU permitting.
Effect: Made permanent the elimination of owner-occupancy on ADUs in unincorporated Warner Springs; JADUs under 500 sqft retain a separate state-law owner-occupancy requirement. - 2026-03-04 — San Diego County PDS ADU Amendment - AB 1033 Separate-Sale Adoption (county-ordinance)
County Board of Supervisors voted unanimously to adopt the ADU Ordinance Amendment, including the Separate Sale of ADUs under Assembly Bill 1033.
Effect: Warner Springs homeowners may, after Tentative Parcel Map and condominium-conversion procedures, sell an ADU separately from the primary dwelling. Practical uptake low given small parcel inventory and remote location.
Known issues (2)
- policy-review (since 2026-03) — PDS adopted the AB 1033 separate-sale framework on 2026-03-04; practical uptake in remote Warner Springs is expected to be minimal due to small parcel-conversion inventory. (source)
- other (since 2024-01) — Warner Springs is a frequent PSPS de-energization community. ADU designs increasingly include backup-power (generator or battery+solar) to maintain habitability during multi-day outages. (source)
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 Codes
- 92066
- 92086
Post Office
- 31650 Highway 79, 92086