Everything homeowners ask about building an ADU in Fresno — answered with 2026 data.
Yes, ADUs are allowed in 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. in Fresno, CA. The maximum size for a detached ADU is The greater of 1,400 sq ft or 50% of the average floor area of the primary unit(s). No separate detached cap.. Attached ADUs can be up to Same rule as detached: the greater of 1,400 sq ft or 50% of the average floor area of the primary unit. Fresno has an ADU-friendliness score of 7/10. Check our full Fresno ADU rules page for complete zoning details.
ADU construction in Fresno typically costs $80,000-$200,000. The cost per square foot averages $120-$250. Garage conversions are more affordable at $50,000-$120,000, while prefab ADUs cost $70,000-$180,000. Permit fees add 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 Do not publish a single range without splitting standard-plan vs custom. to your budget. See our detailed Fresno ADU cost guide.
Detached ADUs in Fresno can be up to The greater of 1,400 sq ft or 50% of the average floor area of the primary unit. Attached ADUs are limited to Same rule as detached: the greater of 1,400 sq ft or 50% of the average floor area of the primary unit. Junior ADUs (JADUs) have a cap of 500 sq ft (unchanged). Must be contained entirely within a single-unit primary residence; an attached garage counts as part of the primary residence.. Maximum height is 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.. You are allowed up to 2 ADUs + 1 JADU on a single-unit lot. On multi-unit lots: up to 8 detached ADUs on a qualifying lot.
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.. Note that garage conversions may be exempt from setback requirements if the existing structure is already within the setback area.
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.'. Many cities and states have been relaxing ADU parking requirements in recent years. In California, no additional parking is required for ADUs near transit.
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.'. Note that owner-occupancy rules vary by state law — California and several other states have eliminated this requirement for standard ADUs.
The ADU permit review timeline in Fresno is typically 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.. Plan check: Standard review. Pre-approved plans availability: 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..
Average ADU rental income in Fresno: 1-bedroom units rent for $1,000-$1,400/month, 2-bedroom units for $1,200-$1,700/month. Short-term rentals: Allowed in most areas. Expected ROI: 9-14% annual return.
The minimum lot size for an ADU in Fresno is 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.. This applies to detached ADUs — garage conversions and JADUs may have different or no lot size requirements.
Garage conversions are one of the most popular and affordable ADU options. In Fresno, a garage conversion typically costs $50,000-$120,000. The key advantages are lower cost (no foundation work), potential setback exemptions, and faster permitting. Read our complete garage conversion guide.
Tell us about your project and we'll connect you with ADU builders serving Fresno. Free, no obligation — you choose who to work with.
🔒 Your info is secure. We share it only with contractors quoting your project. No spam, no obligation.
Just browsing? Search ADU builders near you by ZIP code.