Fresno offers some of the lowest ADU construction costs in California with growing rental demand. The city is an emerging ADU market with excellent ROI potential for investors.
Zoning & Size Requirements [1]
Yes — Fresno allows ADUs. A detached ADU can typically be up to 1,400 sq ft under current California and Fresno zoning rules.
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| Allowed Zones | Any zone district that allows single-unit and multi-unit residential dwellings or mixed-use development, or where a single-unit structure, duplex or multi-unit structure is existing or proposed. JADUs are limited to single-unit districts or where a single-unit dwelling is existing or proposed. The June 2025 ordinance deleted the standalone 'Second Dwelling Unit' row from the RS/RM/MX/C/DT use tables, so eligibility is now governed solely by 15-2754. |
| Max Size (Detached) | The greater of 1,400 sq ft or 50% of the average floor area of the primary unit(s). No separate detached cap. |
| Max Size (Attached) | Same rule as detached: the greater of 1,400 sq ft or 50% of the average floor area of the primary unit(s). Fresno's code does not impose a separate, smaller attached-ADU cap. |
| Max Size (JADU) | 500 sq ft (unchanged). Must be contained entirely within a single-unit primary residence; an attached garage counts as part of the primary residence. |
| Max Height | The underlying district's height limit or 30 ft, whichever is greater. All RS districts (RE, RS-1 to RS-5) allow 35 ft, so 35 ft applies on a typical Fresno single-unit lot. ADUs may be multiple stories or located above the ground floor. |
| Max Units | Up to 2 ADUs + 1 JADU on a single-unit lot. On multi-unit lots: up to 8 detached ADUs (not to exceed the number of existing units), plus conversions of non-livable space equal to 25% of existing units or 1 ADU, whichever is greater. |
Setback Requirements [1]
Fresno requires a rear setback of about 4 ft for a detached ADU, and parking requirements vary by unit size or location. Owner-occupancy is not required — you can rent it out without living on the property.
| Rear Setback | The underlying base district's rear setback or 4 ft, whichever is LESS. Zero feet on lots abutting an alley (2 ft if the ADU's main entrance faces the alley). Where a recorded utility easement exists, the setback must include the easement. |
| Side Setback | Same as rear: the underlying base district's setback or 4 ft, whichever is LESS; 0 ft abutting an alley (2 ft if main entrance on the alley). |
| Front Setback | Per the underlying district (RS front setbacks are 35 ft in RE/RS-1, 30 ft RS-2, 25 ft RS-3, 13 ft RS-4 and RS-5), but the front setback may not be applied so as to preclude an ADU of at least 800 sq ft. Separately, detached ADUs must sit behind the front facade of the primary unit unless that would preclude an 800 sq ft ADU. |
| Parking Required | No parking required — confirmed correct. Worth noting the drafting history: the version sent to the Planning Commission would have required 1 space for ADUs with 3+ bedrooms; a May 21, 2025 errata struck that entirely, and the adopted text reads only 'Parking. No parking is required.' |
| Owner Occupancy | Not required for an ADU. FOR A JADU Fresno's code still requires the owner to live in either the primary residence or the JADU (exception only where the owner is a governmental agency, land trust or housing organization) — written without the state's shared-sanitation condition. Since AB 1154 (eff. 1/1/2026) this is preempted for a JADU with its own bathroom, and FMC 15-2754.B.1 says the Government Code prevails on conflict. Homeowners should be told the ADU answer is a clean 'no' and the JADU answer is 'only if it shares a bathroom.' |
| Min Lot Size | No minimum lot size. Fresno goes further than the state floor: ADUs and JADUs are excluded from lot-coverage calculations entirely and from density calculations entirely — not merely protected up to 800 sq ft. The city's own council presentation says the old minimum-lot-size and coverage restrictions were deleted as unenforceable. |
Permit Process & Fees [2]
An ADU permit in Fresno goes through a ministerial, by-right review. Typical timeline: City-published turnaround for pre-approved (standard) plans: completed applications reviewed in approx. 14 days; the application packet states the initial plan check takes approx. 7 business days once the application moves into review. Fresno's code sets no local deadline of its own; the 60-day figure is the state ministerial deadline, not a Fresno fact.. Permit fees: City-published figures for a pre-approved-plan ADU: Plans FREE, Plan Check FREE, Building Permit 'Up to $2,400', School Impact Fee varies by sq ft (school fee is the district's, not the city's). Underlying Master Fee Schedule rates (fees effective 07/01/2025): R-3 One or Two-Family Production/Repeat/Standard Plan Infill = $34.89 plan check base + $1,279.35 inspection base at the 1,000 sq ft threshold. A custom-designed ADU instead uses R-3 (Custom): $580.69 plan check + $1,884.77 inspection at the same threshold. A CBSC surcharge of $1-$4 by valuation also applies. Do not publish a single range without splitting standard-plan vs custom.
| Approval Process | Ministerial building permit only — Fresno's permit matrix lists a Second Dwelling Unit as requiring a building permit and nothing else. No Zone Clearance (which IS required for a new single-unit home or duplex), no Development Permit, no design review. Standard-plan applications are filed through the Accela Citizen Access portal at lmsaca.fresno.gov by selecting Residential and entering the 23-TADU-### template number. |
| Review Timeline | City-published turnaround for pre-approved (standard) plans: completed applications reviewed in approx. 14 days; the application packet states the initial plan check takes approx. 7 business days once the application moves into review. Fresno's code sets no local deadline of its own; the 60-day figure is the state ministerial deadline, not a Fresno fact. |
| Permit Fees | City-published figures for a pre-approved-plan ADU: Plans FREE, Plan Check FREE, Building Permit 'Up to $2,400', School Impact Fee varies by sq ft (school fee is the district's, not the city's). Underlying Master Fee Schedule rates (fees effective 07/01/2025): R-3 One or Two-Family Production/Repeat/Standard Plan Infill = $34.89 plan check base + $1,279.35 inspection base at the 1,000 sq ft threshold. A custom-designed ADU instead uses R-3 (Custom): $580.69 plan check + $1,884.77 inspection at the same threshold. A CBSC surcharge of $1-$4 by valuation also applies. Do not publish a single range without splitting standard-plan vs custom. |
| Impact Fees | None below 750 sq ft. At 750 sq ft and above Fresno charges the flat MULTI-FAMILY residential rate rather than a proportional share of the primary dwelling: Fire Impact Fee $1,738.74/unit; Park Facility Impact Fee $2,681.44 + $1,161.16 land = $3,842.60; Traffic Signal Mitigation $589.56/unit (all per the Master Fee Schedule, fees effective 07/01/2025, adjusted each July 1 by the ENR 20-City CCI). The city's ADU application packet also notes that only Plan #5 (1,015 sq ft) triggers a Regional Transportation Mitigation Fee JPA form. Flag: the flat multi-family rate is not the proportional method Gov. Code 66311.5(c)(2) prescribes — worth a hedge rather than a flat assertion of legality. |
| Plan Check | Standard review |
| Pre-Approved Plans | Yes, and still live as of June 2026. Five FREE pre-approved construction-drawing sets in three exterior styles (Contemporary, Craftsman, Gable): 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 and plan check are free; the homeowner supplies only a plot plan and an options table. Note plans 1-4 are all under 750 sq ft, i.e. impact-fee exempt — that is the single biggest cost lever on the page. |
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Construction Costs [3][4]
Building an ADU in Fresno typically costs $80,000-$200,000 ($120-$250 per sq ft); a garage conversion runs $50,000-$120,000.
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| Average Build Cost | $80,000-$200,000 |
| Cost per Sq Ft | $120-$250 |
| Garage Conversion | $50,000-$120,000 |
| Prefab ADU (Installed) | $70,000-$180,000 |
Finance Your ADU Project
Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders.
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Rental Income Potential [5][6]
A 2-bedroom ADU in Fresno rents for around $1,200-$1,700/mo, an estimated 9-14% annual return.
| Avg Rent (1 Bedroom) | $1,000-$1,400/mo |
| Avg Rent (2 Bedroom) | $1,200-$1,700/mo |
| Short-Term Rental | Allowed in most areas |
| Est. Annual ROI | 9-14% annual return |
Explore Prefab ADU Options
Prefab ADUs can save 20-40% vs. traditional construction and cut build time in half.
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Recent Law Changes
What's Changed Recently
- SB 543 (Jan 2026): ADU applications deemed approved if city fails to act within 60 days
- AB 1154 (effective Jan 1, 2026): A locality may require owner-occupancy for a JADU only if it shares a bathroom with the primary dwelling; JADUs with their own bathroom are exempt (matching detached ADU rules)
- SB 1211 in effect (2025-2026): Up to 8 detached ADUs allowed on multifamily lots statewide
- AB 1033 opt-in expanding (2026): More cities allowing separate sale of ADUs as condos
Tips for Building an ADU in Fresno
- Fresno has the lowest build costs in California = highest ROI potential
- Large lot sizes typical in Fresno are ideal for detached ADUs
- Central Valley heat means good insulation and HVAC are essential
- Growing rental demand from UC Merced and Fresno State students
ADU Builders in Fresno
Looking for an ADU builder in Fresno? ADU projects need a contractor experienced with local zoning, the permit process, and utility connections — not every general contractor has built one. We match Fresno homeowners with experienced local ADU contractors who provide free, no-obligation quotes. Getting at least three bids typically saves 20-40% on the same scope.
Sources & References
All data on this page is sourced from official government records and verified market data. View our full methodology.
- ADU Program — City of Fresno Planning Department — Accessed 2026-06-28
- ADU Program (Pre-Approved Plans) — City of Fresno Planning Department — Accessed 2026-06-28
- Angi — ADU Construction Cost Data Market Data — Accessed 2026-02-24
- Angi — Local ADU Contractor Costs Market Data — Accessed 2026-02-24
- Zillow Rental Manager — Market Rent Data Market Data — Accessed 2026-02-24
- HUD Fair Market Rents Government Data — Accessed 2026-02-24
- ADU Program — City of Fresno Planning Department — Accessed 2026-02-24
- California ADU Handbook — HCD Government Data — Accessed 2026-02-24
Frequently Asked Questions
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