California ADU rules · Fresno County
Can I Build an ADU in Mendota?
Yes — you can build an ADU in Mendota. California's statewide ADU law requires every city, including Mendota, 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 rule1 detached ADU + 1 attached ADU + 1 JADU; total cap of 4 dwelling units per lot
Allows both 1 detached and 1 attached ADU plus 1 JADU, but total units (including primary) capped at 4.
Units on a multifamily lot
Local ruleUp to 2 detached ADUs per lot; conversion ADUs: at least 1, up to 25% of existing units; JADUs not allowed
Detached ADUs capped at 2 per multifamily lot; JADUs prohibited.
Junior ADU (JADU)
Local ruleAllowed
JADUs allowed only on single-family lots.
Size & height
Max detached ADU size
Local rule1,200 sq ft
Detached ADU max is 1,200 sq ft, but conversions of existing structures may exceed this up to the structure's size.
Max attached ADU size
Local rule50% of primary dwelling floor area, or 1,200 sq ft, whichever is greater
Local rule allows attached ADUs to exceed 1,200 sq ft if 50% of primary is greater.
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
CA state law16 ft
16 ft baseline; cities must allow 18 ft within ½ mi of a major transit stop or where the primary dwelling is two-story, and 20 ft on a lot with a multistory multifamily building.
Setbacks
Side setback
Local rule4 ft
4 ft minimum for new construction; conversions may maintain existing nonconforming setbacks.
Rear setback
Local rule4 ft
4 ft minimum for new construction; conversions may maintain existing nonconforming setbacks.
Front setback
Local ruleMust comply with base zone, but cannot preclude an 800 sq ft ADU with 4 ft side/rear setbacks
Front setback per base zone, but cannot block a compliant 800 sq ft ADU.
Separation from main house
CA state lawNone required
No statewide separation requirement between the ADU and the primary dwelling.
Parking
Parking required
Local ruleUp to 1 space
1 space per ADU unless exempt; JADUs require no parking.
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 ruleNot required
No owner-occupancy required until Jan 1, 2025; after that, owner-occupancy required in either the primary or ADU/JADU.
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.
Mendota-specific factors that can change the answer
State law sets the floor, but these local conditions often decide whether a specific parcel works.
Fire sprinklers
Fire sprinklers not required for ADUs if not required for the primary dwelling; ADU construction does not trigger sprinklers for the main house.
Mendota allows both a detached and an attached ADU plus a JADU on single-family lots, but caps total dwellings at 4 per lot. Detached ADUs may be up to 1,200 sq ft (or larger if converting an existing structure), and attached ADUs may exceed 1,200 sq ft if 50% of the primary dwelling is greater.
Frequently asked questions
Can I build an ADU in Mendota?
Yes. California's statewide ADU law requires Mendota 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 Mendota?
A detached ADU of at least 1,200 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 Mendota?
Side and rear setbacks are limited to 4 ft. Must comply with base zone, but cannot preclude an 800 sq ft ADU with 4 ft side/rear setbacks.
Is parking required for an ADU in Mendota?
Up to 1 space. 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 Mendota?
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 Mendota?
Owner-occupancy: not required. ADUs under 750 sq ft are also exempt from impact fees.
Sources
- Mendota Zoning Code §17.08.060 (as amended by Ord. No. 24-02, 5-28-2024)
- Mendota Zoning Code §17.08.060(D)(1)(b), (D)(2)(b), (D)(4)(b)
- Mendota Zoning Code §17.08.060(D)(3)(a), (D)(4)(b)
- Mendota Zoning Code §17.08.060(D)(4)(b)
- Mendota Zoning Code §17.08.060(D)(1)(c)
- Mendota Zoning Code §17.08.060(D)(2)(c)
- Mendota Zoning Code §17.08.060(D)(1)(d), (D)(2)(d)
- Mendota Zoning Code §17.08.060(D)(1)(f), (D)(2)(f), (D)(4)(d)
- Mendota Zoning Code §17.08.060(D)(1)(g), (D)(2)(g), (D)(4)(h); Gov. Code § 66315
- Mendota Zoning Code §17.08.060(D)(5)(a)
- 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 § 66321 (size minimums & height)
- Cal. Gov. Code § 66333 (junior ADUs)
- Cal. Gov. Code § 66323 (by-right ADU/JADU, 800 sq ft, 4-ft setbacks)
- 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 Mendota'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 Mendota Planning before relying on it.
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