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 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). 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) (FMC 15-2754.D.4.a). A conversion of an existing accessory structure may expand up to 150 sq ft beyond its footprint for ingress and egress (D.4.a.i). ADUs are excluded from lot-coverage and density calculations (D.1, D.2). 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 8/10. Check our full Fresno ADU rules page for complete zoning details.
ADU construction in Fresno typically costs $150,000-$320,000. The cost per square foot averages $200-$330. Garage conversions are more affordable at $65,000-$150,000, while prefab ADUs cost $120,000-$280,000. 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. 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, 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). Maximum height is The underlying district's height limit or 30 ft, whichever is greater, so never less than 30 ft; ADUs may be two stories or built above a garage (FMC 15-2754.D.5). Where the base district allows more than 30 ft, the district limit governs — check your zone's table. You are allowed up to Single-unit lots: up to 2 ADUs plus 1 JADU on a qualifying lot.
Rear setback: The underlying district's rear setback or 4 ft, whichever is less (FMC 15-2754.D.6.a). 0 ft where the lot abuts an alley, or 2 ft if the ADU's main entrance faces the alley (D.6.a.i). A recorded utility easement must stay clear even if that forces a larger setback (D.6). Side setback: Same as rear: the district's side setback or 4 ft, whichever is less; 0 ft abutting an alley, 2 ft if the main entrance is on the alley (FMC 15-2754.D.6.a). Building-code fire separation from property lines and other structures still applies and is checked on the plot plan. Front setback: Per the underlying district, but the front setback may not be applied so as to preclude an ADU of at least 800 sq ft (FMC 15-2754.D.6.b). A detached ADU must sit behind the front facade of the primary home unless that would preclude an 800 sq ft ADU (D.7). Note that garage conversions may be exempt from setback requirements if the existing structure is already within the setback area.
None. FMC 15-2754.E reads in full: 'Parking. No parking is required.' The Council presentation of June 12, 2025 describes this as 'no additional parking required, in alignment with State law'; a May 21, 2025 Planning Commission errata had discussed one space for ADUs with three or more bedrooms, but the text Council introduced contains no parking requirement. State law (Gov. Code 66314) bars replacement-parking demands when a garage is converted. 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 (FMC 15-2754.F.1.a). For a JADU the owner must live in either the house or the JADU unless the owner is a government agency, land trust or housing organization (F.1.b). Since AB 1154 (Jan 1, 2026) that can be enforced only for a JADU that shares a bathroom with the house; 15-2754.B.1 says the Government Code prevails on any conflict. 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 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. 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 availability: 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.
Average ADU rental income in Fresno: 1-bedroom units rent for $1,300-$1,550/month, 2-bedroom units for $1,550-$1,900/month. Short-term rentals: No. An ADU or JADU may only be rented for terms of 30 consecutive days or longer (FMC 15-2754.F.3). Expected ROI: 6-12% gross rental yield (annual rent divided by build cost, before vacancy, taxes and upkeep).
The minimum lot size for an ADU in Fresno is No minimum lot size. ADUs and JADUs are excluded from lot-coverage and density calculations (FMC 15-2754.D.1, D.2); the June 2025 rewrite deleted the old minimum-lot-size and coverage rules as preempted by state law (Council presentation, file 25-658). 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 $65,000-$150,000. The key advantages are lower cost (no foundation work), potential setback exemptions, and faster permitting. Read our complete garage conversion guide.
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