A garage conversion is usually the lowest-cost path to an ADU in Fresno — $65,000-$150,000, versus $150,000-$320,000 for a new detached build — because the shell already exists.
Garage Conversion Cost in Fresno
Converting an existing garage in Fresno runs $65,000-$150,000. That's well under the $150,000-$320,000 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 Pre-approved plans: plans and plan check free; the city's Oct 2025 estimator puts the building permit at $2,344-$2,861 by plan. Custom ADU: Master Fee Schedule (eff. 7/1/2026) R-3 Custom = $599.56 plan check + $1,946.03 inspection at 1,000 sq ft, plus a 12.83% General Plan surcharge.. A converted unit rents for about $1,300-$1,550/mo (1BR) in Fresno.
The Fresno Garage Conversion Permit Process
A garage-to-ADU conversion in Fresno needs building permits even if the exterior is unchanged. Approval process: Ministerial building permit only: pre-approved and custom ADUs no longer need a Zone Clearance, and there is no Development Permit or design review (city ADU page). Apply through Accela Citizen Access (lmsaca.fresno.gov): choose Residential, answer 'Is this an ADU', and for a pre-approved plan enter template 23-TADU-001 to -005 with a plot plan and option table. The owner release, city affidavit and the school district's fee form are due before issuance (packet, Feb 2024). The review timeline is Pre-approved plans: completed applications are reviewed in about 14 days (ADU Quick Start Guide); the first plan check takes about 7 business days once in review (packet). Custom ADUs: no local target published; Gov. Code 66317 (SB 543) deems the permit approved if the city does not act in 60 days., with plan check: Free for the five pre-approved plans (Quick Start Guide). Custom ADU: R-3 Custom plan check $599.56 at the 1,000 sq ft threshold; a standard or repeat plan is $36.02 (Master Fee Schedule eff. 7/1/2026). Incomplete or illegible plot plans are placed on hold, not reviewed.. Pre-approved plans: Yes: five free construction-drawing sets, each in Contemporary, Craftsman or Gable elevations. Plan 1 = 340 sq ft studio (23-TADU-001), Plan 2 = 499 sq ft 1-bed (002), Plan 3 = 625 sq ft 1-2 bed (003), Plan 4 = 625 sq ft over a 625 sq ft garage (004), Plan 5 = 1,015 sq ft 3-bed 2-bath (005). Plans include solar; sprinklers are required if the main house is sprinklered. City estimate (Oct 2025) for permit, impact and utility fees: $7,958-$8,444 for Plans 1-4 and $15,610 for Plan 5; all-in with ICC-average construction $65,000-$196,000 before school fees..
- Confirm eligibility — ADUs are allowed in Any zone district that allows single-unit or multi-unit dwellings or mixed-use development, or any lot where a single-unit home, duplex or multi-unit building exists or is proposed (FMC 15-2754.B.2.a). JADUs only in single-unit districts or where a single-unit dwelling exists or is proposed (B.2.b). A tiny house on wheels counts as an ADU if ANSI-certified, set on an engineered foundation and skirted (C.1.a)..
- Prepare conversion plans — layout, egress windows, insulation, ventilation, smoke/CO detectors, plus a kitchen and bathroom.
- Submit for plan check — Free for the five pre-approved plans (Quick Start Guide). Custom ADU: R-3 Custom plan check $599.56 at the 1,000 sq ft threshold; a standard or repeat plan is $36.02 (Master Fee Schedule eff. 7/1/2026). Incomplete or illegible plot plans are placed on hold, not reviewed..
- Pull permits and build — fees run Pre-approved plans: plans and plan check free; the city's Oct 2025 estimator puts the building permit at $2,344-$2,861 by plan. Custom ADU: Master Fee Schedule (eff. 7/1/2026) R-3 Custom = $599.56 plan check + $1,946.03 inspection at 1,000 sq ft, plus a 12.83% General Plan surcharge.; 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, contained entirely within a single-unit primary residence; an attached garage counts as part of the residence (FMC 15-2754.C.2, D.4.b). A JADU may share a bathroom with the house if it keeps an interior door to the main living area (C.2.a) and may have an efficiency kitchen (C.2.b). 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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Fresno Garage Conversion FAQ
How much does a garage conversion cost in Fresno?
Do I need a permit to convert a garage in Fresno?
Do I have to replace the parking if I convert my garage in Fresno?
How long does a garage conversion take in Fresno?
Can I convert an attached garage into a JADU in Fresno?
Compare your options: see the full Fresno ADU rules, estimate your build with the Fresno ADU cost calculator, or read the general garage conversion guide.