A garage conversion is usually the lowest-cost path to an ADU in Upland — $70,000-$150,000, versus $160,000-$300,000 for a new detached build — because the shell already exists.
Garage Conversion Cost in Upland
Converting an existing garage in Upland runs $70,000-$150,000. That's well under the $160,000-$300,000 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 Building permit and plan-check fees via the Development Services Department — confirm amounts with Building & Safety, (909) 931-4110. A converted unit rents for about $1,950-$2,150/mo (1BR) in Upland.
The Upland Garage Conversion Permit Process
A garage-to-ADU conversion in Upland needs building permits even if the exterior is unchanged. Approval process: Ministerial approval — building permit only for state-exempt units (conversions, one 800 sq ft detached), ADU permit for larger units; deed restriction recorded before certificate of occupancy; annual rent reporting to the city required after permit issuance The review timeline is 60 days from complete application (SB 543 deemed-approval applies from 2026), with plan check: Reviewed by Planning (zoning) and Building & Safety (CBC/CRC); design standards require matching materials/roof slope, 12-inch eave overhangs, privacy screening, down-lighting, and drought-tolerant landscaping; roof decks prohibited. Pre-approved plans: Yes — free, permit-ready pre-approved ADU plans for Upland residents; third-party architects may also submit Pre-Approved ADU Templates; site plan still required.
- Confirm eligibility — ADUs are allowed in Any lot in a residential or mixed-use zone (building-permit-only path); lots zoned for single-family or multifamily residential use (ADU-permit path); JADUs on single-family lots only.
- Prepare conversion plans — layout, egress windows, insulation, ventilation, smoke/CO detectors, plus a kitchen and bathroom.
- Submit for plan check — Reviewed by Planning (zoning) and Building & Safety (CBC/CRC); design standards require matching materials/roof slope, 12-inch eave overhangs, privacy screening, down-lighting, and drought-tolerant landscaping; roof decks prohibited.
- Pull permits and build — fees run Building permit and plan-check fees via the Development Services Department — confirm amounts with Building & Safety, (909) 931-4110; 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 single-family dwelling or attached garage 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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Upland Garage Conversion FAQ
How much does a garage conversion cost in Upland?
Do I need a permit to convert a garage in Upland?
Do I have to replace the parking if I convert my garage in Upland?
How long does a garage conversion take in Upland?
Can I convert an attached garage into a JADU in Upland?
Compare your options: see the full Upland ADU rules, estimate your build with the Upland ADU cost calculator, or read the general garage conversion guide.