Garage Conversion in Anaheim, CA: Cost, Permits & Rules (2026)

A garage conversion is usually the lowest-cost path to an ADU in Anaheim — $75,000-$165,000, versus $130,000-$290,000 for a new detached build — because the shell already exists.

Garage Conversion Cost in Anaheim

Converting an existing garage in Anaheim runs $75,000-$165,000. That's well under the $130,000-$290,000 typical cost of a ground-up detached ADU, because you're reusing the foundation, walls, and roof. The biggest variables are whether the slab and framing are sound, what utility/electrical upgrades are needed, and your finish level. Permit fees add $3,500-$12,000. A converted unit rents for about $1,700-$2,300/mo (1BR) in Anaheim.

The Anaheim Garage Conversion Permit Process

A garage-to-ADU conversion in Anaheim needs building permits even if the exterior is unchanged. Approval process: Ministerial, reviewed by the Planning and Building Director under Gov. Code 66317, without discretionary review or hearing. Two local features worth publishing: (1) no waiver, administrative adjustment or variance from ANY requirement of 18.38.015 may be approved, and no such application may even be accepted for processing — the standards are hard limits with no relief valve except the front-setback modification noted above; (2) an appeal of a staff determination must itself be decided within 60 days. Three routes exist: standard building review with your own designer, the free Pre-Approved Plan Catalogue used in standard review, or ADU Express. The review timeline is '60 days' alone is incomplete. The code sets a two-stage clock: the city must determine whether the application is complete within 15 BUSINESS days, and every resubmittal is subject to the same 15-business-day review period; once deemed complete, the permit must be approved or denied within 60 days. Where the ADU application is filed together with an application for a new primary dwelling, the city may defer the ADU decision until the primary is decided. Separately, via ADU Express the city advertises the review completed in 1-3 days with the building permit issued in as little as one day — but be honest that the city also says the eligibility screening beforehand 'can take a few weeks to complete'., with plan check: Standard city review. Pre-approved plans: Badly understated — this is the most commercially valuable fact on the page. Anaheim publishes a Pre-Approved Plan Catalogue of four detached ADU plans, each listed 'Free': Plan 001 studio, 224 sq ft; Plan 002 one bedroom / one bathroom, 499 sq ft; Plan 003 two bedroom / two bathroom, 990 sq ft; Plan 004 three bedroom / three bathroom, 1,199 sq ft. Plans include Building Code requirements effective 1 July 2024 and the city says it keeps adding plans. Two ways to use them: in the standard review process, or through ADU Express, an accelerated track for qualified single-family properties where the plans may NOT be modified. ADU Express steps include a free 400-amp multi-meter 'meter spot' from Anaheim Public Utilities (usually within three business days), an in-person site-plan meeting at City Hall, then payment of impact and school fees, after which the permit issues. Eligibility is checked by address through the city's ADU Express Eligibility Tool. Caveat to publish honestly: some catalogue plans still require the owner to hire a design professional for the site plan, Title 24, structural details and soils report..

1. Confirm eligibility — ADUs are allowed in Our zone list is incomplete — it omits the three RH hillside zones and RM-3.5. The code permits ADUs and JADUs in all areas zoned to allow single-family or multiple-family residential use. Single-family zones: RH-1, RH-2, RH-3, RS-1, RS-2, RS-3, RS-4. Multiple-family zones: RM-1, RM-2, RM-3, RM-3.5, RM-4. Two absolute local exclusions we do not mention at all: no ADU or JADU on any parcel that has obtained a permit for an SB 9 Two-Unit Development or Urban Lot Split, and none in any area the City Council designates by resolution as having insufficient sewer infrastructure..
2. Prepare conversion plans — layout, egress windows, insulation, ventilation, smoke/CO detectors, plus a kitchen and bathroom.
3. Submit for plan check — Standard city review.
4. Pull permits and build — fees run $3,500-$12,000; then framing, electrical, plumbing, and final inspection.

No Replacement Parking Required

No. California law (AB 68 / Gov Code §66314) prohibits cities from requiring replacement parking when you convert or demolish a garage to build an ADU — so you do not need to add a parking space anywhere on the lot. Owner-occupancy: Our JADU half is incomplete and currently misleads. No owner-occupancy requirement for an ADU. For a JADU, owner-occupancy applies ONLY where the JADU SHARES sanitation facilities with the primary residence — a JADU with its own bathroom carries no owner-occupancy requirement at all. Where it does apply: a covenant must be recorded with the Orange County Recorder before the building permit issues, the unit not occupied by the owner may only be rented for 30 or more consecutive days, and the requirement is waived where the owner is a governmental agency, land trust or housing organization. Anaheim tracks Gov. Code 66333(b)/AB 1154 exactly.

The JADU Option for an Attached Garage

If your garage is attached to the house, you can convert it into a junior ADU (JADU) — capped at 500 sq ft (unchanged, and correct). Minimum unit size 150 sq ft. Up to 150 sq ft may be added to an existing main dwelling to accommodate ingress or egress, but the overall unit must still not exceed 500 sq ft. Anaheim adopts the state maximum exactly. and built within the existing walls. JADUs are cheaper and faster to permit than a full ADU, though they may share sanitation with the main home. A full ADU gives you more size and a separate unit; a JADU is the budget route.

Anaheim Garage Conversion FAQ