A garage conversion is usually the lowest-cost path to an ADU in Torrance — $70,000-$160,000, versus $200,000-$380,000 for a new detached build — because the shell already exists.
Garage Conversion Cost in Torrance
Converting an existing garage in Torrance runs $70,000-$160,000. That's well under the $200,000-$380,000 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 Fee assessed at building-permit application covering plan review, permit processing, and development impact mitigation — confirm amounts with Community Development, (310) 618-5990. A converted unit rents for about $2,100-$2,400/mo (1BR) in Torrance.
The Torrance Garage Conversion Permit Process
A garage-to-ADU conversion in Torrance needs building permits even if the exterior is unchanged. Approval process: Ministerial building permit through the Community Development Department; no hearing or discretionary review; garage demolition permits issued concurrently with the ADU permit The review timeline is 60 days from complete application per state law (SB 543 deemed-approval applies from 2026), with plan check: Plan review with a full corrections list returned within the 60-day statutory window; City of Torrance Design Guidelines apply (Torrance Tract Design Guidelines in the historic overlay). Pre-approved plans: Yes — City of Torrance Pre-Approved ADU Program through the Building & Safety Division.
- Confirm eligibility — ADUs are allowed in Any residentially zoned or mixed-use lot with a proposed or existing dwelling (single-family or multifamily).
- Prepare conversion plans — layout, egress windows, insulation, ventilation, smoke/CO detectors, plus a kitchen and bathroom.
- Submit for plan check — Plan review with a full corrections list returned within the 60-day statutory window; City of Torrance Design Guidelines apply (Torrance Tract Design Guidelines in the historic overlay).
- Pull permits and build — fees run Fee assessed at building-permit application covering plan review, permit processing, and development impact mitigation — confirm amounts with Community Development, (310) 618-5990; 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 within the primary dwelling or attached garage (+150 sq ft enclosed staircase allowance for 2nd-story JADUs) 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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Torrance Garage Conversion FAQ
How much does a garage conversion cost in Torrance?
Do I need a permit to convert a garage in Torrance?
Do I have to replace the parking if I convert my garage in Torrance?
How long does a garage conversion take in Torrance?
Can I convert an attached garage into a JADU in Torrance?
Compare your options: see the full Torrance ADU rules, estimate your build with the Torrance ADU cost calculator, or read the general garage conversion guide.