California ADU rules · Fresno County
Can I Build an ADU in Fresno?
Yes — you can build an ADU in Fresno. California's statewide ADU law requires every city, including Fresno, to approve a qualifying accessory dwelling unit by right, plus a junior ADU (JADU) on a single-family lot. What varies city to city are the local specifics below.
Can you build one?
ADUs allowed
CA state lawYes — by right
ADUs and JADUs are allowed by right in all residential and mixed-use zones; ministerial approval, no hearing.
Units on a single-family lot
Local rule2 ADUs + 1 JADU
Fresno allows up to two ADUs plus one JADU per single-family lot — more generous than the statewide 1 ADU + 1 JADU floor.
Units on a multifamily lot
CA state lawConversion ADUs (≥1, up to 25% of units) + up to 8 detached
Conversions of non-livable space (at least 1, or up to 25% of existing units) plus up to 8 detached ADUs on a lot with existing multifamily — never exceeding the number of existing units. JADUs are single-family only.
Junior ADU (JADU)
CA state lawAllowed
Up to 500 sq ft, within the walls of an existing single-family home (single-family lots only).
Size & height
Max detached ADU size
Local rule1,400 sq ft
Detached ADUs may be up to the greater of 1,400 sq ft or 50% of the average floor area of the primary unit(s) — well above the typical local 1,000–1,200 sq ft cap.
Max attached ADU size
Local ruleThe greater of 1,400 sq ft or 50% of the average floor area of the primary unit(s)
Guaranteed minimum size
CA state law800 sq ft
An 800 sq ft ADU must be allowed regardless of FAR/lot-coverage caps; a city also cannot cap an attached ADU below 850 sq ft (1,000 for 2+ bedrooms).
Max JADU size
CA state law500 sq ft
Max height
Local rule30 ft
Per the underlying district or 30 ft, whichever is greater; multiple stories and stories above the ground floor are allowed — far above the 16-ft state baseline.
Setbacks
Side setback
Local rule4 ft
Per the base district or 4 ft, whichever is less. An ADU abutting an alley needs 0 ft, or 2 ft if its main entrance faces the alley.
Rear setback
Local rule4 ft
Per the base district or 4 ft, whichever is less; 0 ft along an alley (2 ft if the main entrance faces the alley).
Front setback
CA state lawNo front setback may block the mandatory 800 sq ft / 16-ft / 4-ft-setback ADU; otherwise per base zone
Separation from main house
CA state lawNone required
No statewide separation requirement between the ADU and the primary dwelling.
Parking
Parking required
Local ruleNone
Fresno requires no off-street parking for any ADU or JADU, regardless of transit proximity, and no replacement parking for garage conversions.
Transit parking exemption
CA state lawYes — no parking required near transit & for conversions
No parking may be required within ½ mi walking distance of transit, in a historic district, for an ADU within an existing structure, within one block of car-share, or in certain permit-parking areas.
Garage-conversion replacement parking
CA state lawNot required
When a garage/carport is demolished or converted to build an ADU, replacement parking cannot be required.
Approval, timeline & cost
Approval path
CA state lawMinisterial (by right)
No public hearing or discretionary design review for a qualifying ADU.
Approval timeline
CA state law60 days
The agency must act within 60 days of a complete application — and the ADU is deemed approved if it does not.
Owner-occupancy
Local ruleOnly for a JADU
No owner-occupancy for ADUs; for a JADU the owner must reside in either the primary unit or the JADU (except government, land-trust, or housing-organization owners).
Impact-fee waiver
CA state lawWaived under 750 sq ft
An ADU of 750 sq ft or less pays no impact fees (the 750 sq ft threshold itself is exempt under § 66311.5); larger ADUs pay fees proportional to the primary dwelling. JADUs (≤ 500 sq ft) are exempt.
Permits required
CA state lawBuilding permit
Only a ministerial building permit — no conditional use permit or discretionary design review for a qualifying ADU.
Fresno-specific factors that can change the answer
State law sets the floor, but these local conditions often decide whether a specific parcel works.
Historic / architecturally significant districts
ADUs in an architecturally or historically significant district may require additional review before demolishing a garage to build the ADU.
Fresno is unusually permissive: it allows up to two ADUs plus a JADU per single-family lot, caps detached and attached ADUs at the greater of 1,400 sq ft or 50% of the primary unit's average floor area, permits up to 30 ft of height with multiple stories, and requires no off-street parking. Side and rear setbacks drop to 0 ft along an alley (2 ft if the entrance faces the alley). The binding constraints are typically site utilities and lot coverage rather than the entitlement itself.
Frequently asked questions
Can I build an ADU in Fresno?
Yes. California's statewide ADU law requires Fresno to approve a qualifying accessory dwelling unit ministerial (by right), plus a junior ADU (JADU) on a single-family lot.
How big can an ADU be in Fresno?
A detached ADU of at least 1,400 sq ft must be allowed, and an ADU of 800 sq ft can never be zoned out by floor-area or lot-coverage limits. A JADU can be up to 500 sq ft.
What are the setback requirements for an ADU in Fresno?
Side and rear setbacks are limited to 4 ft. No front setback may block the mandatory 800 sq ft / 16-ft / 4-ft-setback ADU; otherwise per base zone.
Is parking required for an ADU in Fresno?
None. No parking can be required within ½ mile of transit, for conversions, or for units inside the primary home. When a garage is converted, replacement parking is not required.
How long does ADU approval take in Fresno?
A complete application must be acted on within 60 days, with ministerial (by right) — no public hearing or discretionary design review for a qualifying ADU.
Do I have to live on the property to build an ADU in Fresno?
Owner-occupancy: only for a jadu. ADUs under 750 sq ft are also exempt from impact fees.
Sources
- Fresno Mun. Code § 15-2754 (Ord. 2025-024)
- FMC § 15-2754
- FMC § 15-2754; Gov. Code § 66314(f)
- Cal. Gov. Code §§ 66310–66342 (ADU Law)
- HCD 2025 Accessory Dwelling Unit Handbook
- Cal. Gov. Code § 66317 (ministerial approval, 60-day deadline)
- Cal. Gov. Code § 66323 (by-right ADU/JADU, 800 sq ft, 4-ft setbacks)
- Cal. Gov. Code § 66333 (junior ADUs)
- Cal. Gov. Code § 66321 (size minimums & height)
- Cal. Gov. Code § 66322 (ADU parking; § 66334 covers JADU parking)
- Cal. Gov. Code § 66314 (local ordinance standards)
- Cal. Gov. Code § 66311.5 (impact fees: none for an ADU ≤ 750 sq ft or JADU ≤ 500 sq ft)
Last updated 2026-06-25. This is an AI-assisted summary of Fresno's ADU rules, drawn from its published ordinance and California ADU law — general information, not legal advice, and it may be incomplete or out of date. Verify the controlling rule for your specific parcel with Fresno Planning before relying on it.
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