A garage conversion is usually the lowest-cost path to an ADU in Long Beach — $70,000-$150,000, versus $120,000-$280,000 for a new detached build — because the shell already exists.
Garage Conversion Cost in Long Beach
Converting an existing garage in Long Beach runs $70,000-$150,000. That's well under the $120,000-$280,000 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 $3,000-$10,000. A converted unit rents for about $1,500-$2,100/mo (1BR) in Long Beach.
The Long Beach Garage Conversion Permit Process
A garage-to-ADU conversion in Long Beach needs building permits even if the exterior is unchanged. Approval process: Ministerial review; streamlined process The review timeline is 60 days; often 30-45 in practice, with plan check: Efficient review process. Pre-approved plans: Yes — city has pre-approved ADU plans.
- Confirm eligibility — ADUs are allowed in All residential zones; R-1, R-2, R-3, R-4 and planned development zones.
- Prepare conversion plans — layout, egress windows, insulation, ventilation, smoke/CO detectors, plus a kitchen and bathroom.
- Submit for plan check — Efficient review process.
- Pull permits and build — fees run $3,000-$10,000; 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 is not required, so you can rent the converted unit out.
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 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.
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Long Beach Garage Conversion FAQ
How much does a garage conversion cost in Long Beach?
Do I need a permit to convert a garage in Long Beach?
Do I have to replace the parking if I convert my garage in Long Beach?
How long does a garage conversion take in Long Beach?
Can I convert an attached garage into a JADU in Long Beach?
Compare your options: see the full Long Beach ADU rules, estimate your build with the Long Beach ADU cost calculator, or read the general garage conversion guide.