ADU Pass
Santa Ana
Orange County portion
Also in: No County
ADU Pass helps homeowners in Santa Ana, Orange County, California navigate the permit paperwork for building an accessory dwelling unit. This area covers 6 ZIP codes.
Map
ADU details
ADU legality: allowed
ADUs are permitted citywide. Santa Ana has actively embraced ADU policy with a 6-plan Pre-Approved Plans Program enabling same-day over-the-counter approval and a 20-ft / 2-story detached height allowance that exceeds the state baseline. Constraints to verify per parcel: SNA Airport AICUZ (south Santa Ana / west of I-405) and Downtown Santa Ana Historic District design review for Logan / French Park / Floral Park overlays.
Cost scenarios
| Scenario | Sq ft | Permit | Build | Total |
|---|---|---|---|---|
| minimum | 150 | $2,200 | $84,000 | $86,200 |
| 600 | 600 | $7,800 | $300,000 | $307,800 |
| midpoint | 675 | $8,800 | $337,500 | $346,300 |
| 1000 | 1,000 | $11,500 | $480,000 | $491,500 |
Fee breakdown (as of 2026-04)
Permitting process
Viability (permitted uses)
- Long-term rental: yes Long-term rental (30+ days) explicitly permitted. AB 976 voids any Santa Ana requirement for owner-occupancy as a condition of ADU permitting. Note: Santa Ana is a tenant-protection city (Rent Stabilization Ordinance applies to qualifying multi-family housing); ADU rental terms should be reviewed against city tenant-protection rules.
- Short-term rental: no Santa Ana prohibits short-term vacation rentals (under 30 days) per SAMC. Minimum 30-day rental term required. ADU cannot be operated as Airbnb/VRBO.
- Office rental: with-restrictions Detached office rental requires home occupation permit; ADU is residentially defined under Chapter 41.
- Home office: yes Home occupation by owner/resident permitted with restrictions on signage, customer traffic, and employees per Santa Ana Municipal Code.
- Studio / workshop: yes Personal artist studio permitted as accessory residential use; Downtown Santa Ana Artists Village area has a strong creative community.
- Agriculture: no Santa Ana is densely urbanized (one of the densest cities in California); agricultural uses not permitted in residential zones.
- Relative support: yes Family occupancy permitted; multigenerational housing use is common in Santa Ana given the city's high household-size demographics.
Incentives
- CalHFA ADU Grant Program — Up to $40,000 (predevelopment) (Low- to moderate-income homeowners; intermittent funding)
- Santa Ana Pre-Approved ADU Plans Program (6 floorplans, OTC same-day approval) — Six free downloadable detached-ADU plans. Over-the-counter submittal eligible for 1-day approval if site complies. Plans currently reflect 2022 CBC; 2025 CBC updates pending.
- California SB 13 — impact fee exemption for sub-750 sqft ADUs — Statutory exemption from impact fees, connection fees, and capacity charges for ADUs under 750 sqft. Applies in Santa Ana.
Pre-approved plans Pre-approved plans
Contacts
Staff: ADU Information Line (Planning Division — Current Planning) (ADU intake / general ADU questions), Planning Division (Advance Planning, Current Planning, Urban Design, Historic Preservation), Building Safety Division (Permit Services, Plan Check, Inspection Services), Permits Counter (One-Stop) (OTC Pre-Approved Plan submittals; permit issuance)
Utilities
- Water: City of Santa Ana Water Resources Division (municipal — Public Works Agency) · 14d connect · $3,000
- Sewer: City of Santa Ana Sanitary Sewer (municipal); regional treatment by Orange County Sanitation District (OCSD) · 14d connect · $3,800
- Electric: Southern California Edison (SCE) — call 800-655-4555 to obtain MSR# before electrical permit application · 21d connect · $2,000
- Gas: Southern California Gas Company (SoCalGas) · 28d connect · $1,600
Property values & taxes
Market rent by ADU size
| Sq ft | Rent |
|---|---|
| 400 | $1,850/mo |
| 600 | $2,350/mo |
| 800 | $2,750/mo |
| 1,000 | $3,100/mo |
Construction timeline
Realistic total: best 7mo · typical 11mo · worst 17mo
Modular pathway inspectors are occasional with modular
Financing
State ADU loans:
- CalHFA ADU Grant Program up to $40,000
- HCD ADU Funding Index
Insurance impact
HOA prevalence & preemption
Santa Ana has very low HOA coverage compared to master-planned OC cities. The city's older urban-grid neighborhoods (Logan, French Park, Floral Park, Washington Square, Wilshire Square, Riverview West) are pre-CC&R and historically free of homeowner associations. Some newer infill condo communities and townhome developments carry HOA governance, but the broad single-family stock is unaffiliated. California AB 670 / AB 3182 void HOA covenants prohibiting ADUs on single-family lots; rarely a friction point in Santa Ana given low HOA penetration.
Regulatory overlays (3)
- historic-district
Multiple Santa Ana historic districts trigger design review for visible exterior changes: Downtown Santa Ana Historic District, Logan Historic District, French Park Historic District, Floral Park, and Washington Square. ADUs in these districts are subject to Historic Preservation review by Planning Division Urban Design / Historic Preservation team. - airport-noise-zone
Portions of Santa Ana (south of I-405 / east of SR-55) fall under John Wayne Airport (SNA) AICUZ noise contours; sound-attenuation glazing/walls may be required. Airport Land Use Commission (ALUC) review may apply. - flood-zone
Santa Ana River corridor and historic flood-prone neighborhoods carry FEMA flood-zone designation (AE/A); flood-elevation certification required for ADUs in mapped floodplain. The 1938 Los Angeles flood reshaped southwest Santa Ana drainage.
Technical envelope (climate & building code)
Climate & energy code
Building code
Amendments:
- Amendment
- Amendment
Contractor market (aggregate)
Legal history (timeline)
Current ordinance: Santa Ana Municipal Code Chapter 41 — Zoning, Article II §§ 41-194 to 41-194.3 (Accessory Dwelling Units), adopted 2017-01-01, last amended 2025-02-04
- 1986-01-01 — Downtown Santa Ana / Logan / French Park / Floral Park historic district designations (city-program)
Santa Ana designated multiple historic districts in the 1980s including Downtown, French Park, Floral Park, and Washington Square — establishing local historic preservation overlay zones.
Effect: Created the historic-preservation review pathway that today layers design controls onto ADUs in those districts, distinct from state-law ministerial review. - 2017-01-01 — Initial Chapter 41 ADU provisions (§§ 41-194 et seq.) (city-ordinance)
Santa Ana added Sections 41-194 through 41-194.3 to Chapter 41 of the Municipal Code in response to AB 2299 / SB 1069 (2016 California ADU reform).
Effect: Created the local ADU framework under then-current state law. - 2024-08-01 — Pre-Approved ADU Plans Program launched (6 floorplans) (city-program)
City of Santa Ana launched its Pre-Approved ADU Plans Program offering six (6) detached-ADU floorplans free for download, eligible for over-the-counter approval as fast as one day.
Effect: Significantly accelerated the ADU pathway: 6 pre-reviewed plans across 1-BR Ranch/Spanish/Traditional, 2-BR variants, and studio configurations bypass full plan check. Plans currently reflect 2022 CBC; 2025 CBC updates pending. - 2025-01-01 — SB 1211 — multi-family ADU expansion takes effect (state-law)
California SB 1211 expanded ADU pathways for multi-family properties; effective 2025-01-01.
Effect: Triggered Santa Ana's 2025 ordinance update; permits more detached ADUs on multi-family lots and adjusts development standards. - 2025-02-04 — Santa Ana City Council 1st Reading — Chapter 41 ADU update for SB 1211 compliance (city-ordinance)
Santa Ana City Council 1st reading of zoning ordinance amending Chapter 41 to comply with SB 1211 (multi-family ADUs) and other 2024 California ADU statutes.
Effect: Aligned local code with the latest state framework; expanded the multi-family ADU pathway.
Known issues (2)
- policy-review — Pre-Approved Plans are still on 2022 CBC; 2025 CBC updates pending publication. Custom designs already use 2025 CBC. Watch for plan-update release.
- other — Multiple historic districts (Logan, French Park, Floral Park, Washington Square, Downtown) layer design review on ADUs in those neighborhoods. Generic Pre-Approved Plans will likely fail historic-district review without exterior modifications matching district character.
Orange County — county ADU rules and overlays
County ADU ordinance
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
- 92701
- 92703
- 92704
- 92705
- 92706
- 92707
Post Office
- 1415 S Main St, 92707
- 1517 S Greenville St, 92704
- 1609 N King St, 92706
- 1620 W 1st St, 92703
- 2201 N Grand Ave, 92711