Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Calculate your Fresno ADU cost →Building an ADU in Fresno costs between $150,000-$320,000 for new construction, with per-square-foot costs averaging $200-$330. These figures include design, permitting, site preparation, and construction. The most affordable option is a garage conversion at $65,000-$150,000, while prefab/modular ADUs fall in between at $120,000-$280,000.
| Cost Category | Estimated Range |
|---|---|
| Architectural Plans | $3,000 – $15,000 |
| Permits & Fees | 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. |
| Impact Fees | $0 for an ADU of 750 sq ft or less (Master Fee Schedule eff. 7/1/2026; Gov. Code 66311.5). Above that the schedule's footnote applies the multi-family per-unit rates (fire $1,743.86, park $3,853.92, traffic signal $591.30), while the city's Oct 2025 estimator charges its 1,015 sq ft Plan 5 a proportional share: $5,258.66 in fire, park, police and traffic-signal fees plus a $1,184.72 regional transportation fee. At any size a wastewater facilities charge ($480-$1,171 by plan) applies, and a new 1-inch water service, meter and capacity fee add $5,134 if you do not tie into the house line. School fees ($4.79-$5.86 per sq ft) are the district's, not the city's. |
| Site Prep & Foundation | $10,000 – $35,000 |
| Framing & Structure | $15,000 – $45,000 |
| Plumbing | $8,000 – $20,000 |
| Electrical | $5,000 – $15,000 |
| HVAC | $3,000 – $8,000 |
| Interior Finishes | $15,000 – $40,000 |
Quotes for the same ADU commonly vary 20–40% between builders. We pass your request to up to 5 local builders serving Fresno, where we have them — free, no obligation.
Get Fresno builder quotes →Permit fees in Fresno are 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.. 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.. Impact fees are $0 for an ADU of 750 sq ft or less (Master Fee Schedule eff. 7/1/2026; Gov. Code 66311.5). Above that the schedule's footnote applies the multi-family per-unit rates (fire $1,743.86, park $3,853.92, traffic signal $591.30), while the city's Oct 2025 estimator charges its 1,015 sq ft Plan 5 a proportional share: $5,258.66 in fire, park, police and traffic-signal fees plus a $1,184.72 regional transportation fee. At any size a wastewater facilities charge ($480-$1,171 by plan) applies, and a new 1-inch water service, meter and capacity fee add $5,134 if you do not tie into the house line. School fees ($4.79-$5.86 per sq ft) are the district's, not the city's.. 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..
| 1-Bedroom Rent | $1,300-$1,550/month |
| 2-Bedroom Rent | $1,550-$1,900/month |
| Annual Rental Income (est.) | $17,100/year |
| Payback Period (est.) | 13.7 years |
| Short-Term Rental | No. An ADU or JADU may only be rented for terms of 30 consecutive days or longer (FMC 15-2754.F.3). |
| Overall ROI Estimate | 6-12% gross rental yield (annual rent divided by build cost, before vacancy, taxes and upkeep) |
A typical ADU in Fresno generates approximately $17,100 per year in rental income based on average 1-bedroom rents. At an average construction cost of $235,000, the estimated payback period is 13.7 years — before accounting for the resale value the ADU adds, which an appraiser determines from comparable sales in Fresno and varies by market (often less than build cost).
1. Garage conversions save 40-60% vs new construction since the shell already exists. Average cost in Fresno: $65,000-$150,000.
2. Prefab/modular ADUs offer predictable pricing and faster timelines. Average: $120,000-$280,000.
3. Pre-approved plans — available in Fresno, which can save $3,000-$10,000 in design costs and 2-3 months in review time. See which cities offer pre-approved ADU plans.
4. State grants — California's CalHFA ADU grant (up to $40K) is currently paused; check calhfa.ca.gov/adu for status and your state for active programs.
5. Get multiple bids — ADU contractor pricing varies 20-40% for the same project. We recommend getting at least 3 quotes.
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