Santa Ana's Accessory Structures: The Rules That Matter

Every city handles accessory structures a little differently. In Santa Ana, California, there are 9 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Tiny Homes

Tiny homes in Santa Ana are primarily regulated through the ADU framework under SAMC Section 41-194 and California Government Code Section 65852.2. Tiny homes on wheels are generally not permitted as permanent residences on residential lots unless they meet ADU or JADU requirements.

Key details: ADU Max Size: 1,200 sq ft (detached). JADU Max Size: 500 sq ft (within existing structure). Permit Type: Ministerial building permit. Code Section: SAMC §41-194. THOWs: Not permitted as permanent residence.

Building or placing a tiny home without required permits is subject to code enforcement action. Violations may result in fines, removal orders, or required retroactive permitting. Living in an RV or THOW on a residential lot may result in a nuisance violation.

ADU Rules

Santa Ana allows ADUs on all residential lots per SAMC Sec. 41-194 and California Gov. Code Sec. 65852.2. Up to one ADU and one JADU per single-family lot. Detached ADUs may be up to 16 feet tall with 4-foot side/rear setbacks. No owner-occupancy requirement.

Key details: Max Per Lot: 1 ADU + 1 JADU (SF). Height (Detached): 16 feet. Setbacks: 4 ft side/rear. Code Section: Sec. 41-194.

Unpermitted ADU construction: stop work order and mandatory permitting. Non-compliant ADU: building code violation. STR use of ADU: violation of both ADU and STR ordinances.

ADU Impact Fees

Santa Ana cannot charge impact fees on ADUs under 750 square feet under California Government Code §65852.2(f)(3)(A), which preempts local fee schedules. For ADUs 750 sf and larger, impact fees must be charged proportionally to the size of the primary dwelling per square foot, as required by state law and implemented in SAMC §41-194.

Key details: Sub-750 sf Waiver: All impact fees waived (state law). Statute: CA Gov Code §65852.2(f)(3)(A). 750+ sf ADUs: Proportional to primary dwelling. Utility Connection: No new connection required for conversions. School Fees: Santa Ana USD, under Ed Code §17620.

Charging prohibited impact fees on a sub-750 sf ADU is a violation of state law; applicants may demand a refund and HCD may take enforcement action against the city under Gov. Code §65852.2(h), including referral to the Attorney General.

Santa Ana is more permissive than most cities when it comes to adu impact fees. That said, there are still limits.

ADU Rental Restrictions

California Government Code §65852.2(a)(6) prohibits using ADUs and JADUs as short-term rentals of fewer than 30 days. Santa Ana's SAMC §41-194 confirms that ADUs and JADUs cannot be used as vacation rentals but may be rented for 30+ days. A deed restriction is recorded at permit issuance making this restriction binding on future owners.

Key details: Minimum Lease: 30 days (state-mandated). Statute: CA Gov Code §65852.2(a)(6) (AB 587). Code Section: SAMC §41-194. Deed Restriction: Recorded at permit issuance. Long-Term Rentals: Allowed, subject to local Just-Cause.

Renting an ADU for less than 30 days is enforced through Code Enforcement under SAMC Chapter 8 with administrative citations and injunctive relief enforcing the recorded deed restriction. Operating without paying Transient Occupancy Tax can also trigger Finance Department collection actions.

ADU Permits

Santa Ana reviews ADU applications ministerially through the Planning Division of the Planning and Building Agency under SAMC Section 41-194 (recently updated to align with SB 1211, effective January 1, 2025). Plan review is local through the City's E-Plan electronic submittal system; the California Department of Housing and Community Development (HCD) sets statewide standards but does not review individual permits.

Key details: Code Section: SAMC §41-194. State Law: CA Gov Code §65852.2; SB 1211 (2025). Review Department: Planning & Building Agency. Processing Cap: 60 days after complete application. Submittal: E-Plan electronic system.

Building an ADU without permits is a violation of SAMC Chapter 8 (Property Maintenance) and Chapter 41 (Zoning) enforced by Code Enforcement. Penalties under SAMC Section 1-8 reach up to $1,000 per day and may include stop-work orders, removal orders, or retroactive permitting with double fees.

The rules around adu permits in Santa Ana lean permissive, but that does not mean anything goes.

ADU Owner Occupancy

Under California AB 587 (codified at Gov. Code §65852.2(a)(6)) and AB 976 (2023), Santa Ana cannot impose owner-occupancy requirements on ADUs permitted on or after January 1, 2020. AB 976 made the prohibition permanent. Junior ADUs (JADUs) still require owner-occupancy of either the primary unit or the JADU under Gov. Code §65852.22 and SAMC §41-194.

Key details: ADU Owner-Occupancy: Prohibited by AB 976 (permanent). JADU Owner-Occupancy: Required (Gov Code §65852.22). Statute: CA Gov Code §65852.2(a)(6) (AB 587/AB 976). Pre-2020 ADUs: Existing deed restrictions remain. Annual Affidavit: Not required.

Attempting to enforce owner-occupancy on a post-2020 ADU is a violation of state law and unenforceable. JADU owner-occupancy violations are addressed through Code Enforcement under SAMC Chapter 8 and may result in citations and removal of the JADU's separate kitchen facilities.

The rules around adu owner occupancy in Santa Ana lean permissive, but that does not mean anything goes.

Garage Conversions

Garage conversions in Santa Ana are treated as ADUs under SAMC Sec. 41-194 and California ADU law. Converted garages do not require replacement parking. The structure must meet habitability standards including kitchen, bathroom, ventilation, and structural integrity requirements.

Key details: Framework: ADU per Sec. 41-194. Replacement Parking: Not required. Setbacks: Exempt for conversions. Pre-2020 Conversions: AB 2533 legalization path.

Unpermitted conversion: building code violation and mandatory legalization. Non-compliant habitability: red-tag and occupancy restrictions. Using converted space as STR: STR ban violation.

Shed Rules

Santa Ana exempts one-story detached storage sheds under 120 square feet from building permit requirements. Larger structures require permits and must comply with zoning setbacks under SAMC Sec. 41-606 and 41-607. Accessory structures may not be located within 12 feet of an alley centerline.

Key details: Permit Exempt: Under 120 sq ft. Alley Setback: 12 ft from centerline. Between Buildings: 15 ft minimum. Code Section: Sec. 41-606/41-607.

Unpermitted structure over 120 sq ft: building code violation. Setback violation: code enforcement citation. Structures blocking alley access: mandatory removal or modification.

If you are coming from a city with tighter rules, you will find Santa Ana gives residents more flexibility on shed rules.

Carport Rules

Carports in Santa Ana are regulated as accessory structures under SAMC Chapter 41 (Zoning). Attached carports must maintain the same yard setbacks as the main building per Section 41-607. A building permit is required for carport construction.

Key details: Permit Required: Yes — building permit. Setbacks: Same as main building (SAMC §41-607). Lot Coverage: Counts toward zone maximum. Zoning Code: SAMC Chapter 41, Article IV. Contact: Planning & Building Agency (714) 647-5804.

Unpermitted carport construction is subject to code enforcement action under SAMC. Violations may result in stop-work orders, fines, required removal, or retroactive permitting with applicable fees.

The Bottom Line

Compared to many U.S. cities, Santa Ana gives residents more room on accessory structures. 4 of the 9 rules here are rated permissive. But permissive does not mean unregulated. There are still requirements, and the city does enforce them when violations are reported.

Keep in mind that Santa Ana can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.