ADU Rules in Fresno, CA (2026)
ADU rules, permit requirements, size limits, and fees for Fresno, CA. Source-cited from official municipal code.
Yes, ADUs are allowed in Fresno, CA.
Fresno, CA permits accessory dwelling units (ADUs) on residential properties. ADUs — also called granny flats, in-law units, backyard cottages, or secondary suites — are secondary housing units on a single-family or multifamily lot. California state law governs the approval process. In Fresno, the local building department handles ADU permit applications. Below you will find the current size limits, setbacks, fees, and timeline for building an ADU in Fresno.
ADU Size Limits
ADU Size Limits in Fresno: Detached ADU: size varies by zoning — see official source (max height: varies — see official source). Attached ADU: 50 percent of the existing primary dwelling. Junior ADU (JADU): up to 500 sq ft — must be within the existing primary dwelling or accessory structure.
| Type | Max Size | Max Height |
|---|---|---|
| Detached ADU | See official source | See official source |
| Attached ADU | 50 percent of the existing primary dwelling · Verified June 4, 2026 · Source | See official source |
| JADU | 500 sq ft · Verified June 4, 2026 · Source | Within existing structure |
Permit Fees
ADU Permit Fees in Fresno: Plan check fee: Varies. Building permit fee: Varies. Impact fees: None. School fees: None or N/A. Total estimated permit cost: Varies.
| Fee Type | Amount |
|---|---|
| Plan Check | $400–$2,000 depending on project value |
| Building Permit | $800–$4,000 depending on valuation |
| Impact Fees | None |
| School Fees | Exempt for ADUs under 500 sqft. ADUs 500+ sqft subject to Fresno Unified School District developer fees. |
| Total Estimate | See official source |
Permit Timeline
Fresno ADU Permit Timeline: The permitting agency shall either approve or deny the application to create or serve an accessory dwelling unit within 60 days from the date the permitting agency receives a completed application if there is an existing single-family or multifamily dwelling on the lot. Apply through the local building department online permit portal. Contact them through their official website for current contact information.
Setback Requirements
ADU Setback Requirements in Fresno: Front setback: follows zone standard. Side setback: 4 feet. Rear setback: 4 feet.
Parking Requirements
Parking Requirements: Parking requirements have not been confirmed — see official source.
Restrictions & Requirements
- ADU must comply with Fresno Municipal Code objective zoning and design standards
- ADU cannot be sold separately from primary dwelling (unless Urban Lot Split per Gov Code §66411.7 applies)
- Short-term rental of ADU (fewer than 30 days) requires Fresno Short-Term Rental permit
- ADU must have permanent foundation
- Agricultural zone interface lots may have additional buffer requirements
- Fresno's hot summer climate requires Title 24 cool roof and insulation compliance for ADU comfort
How Many ADUs Are Allowed?
Number of ADUs Allowed in Fresno: Single-family lots: not confirmed — see official source. Multifamily properties: not confirmed — see official source.
- Single-Family Lots
- 1 ADU + 1 JADU per single-family lot
- Multifamily Properties
- Up to 25% of existing units (minimum 2) as detached ADUs; internal non-livable space conversions permitted
Statewide Preemption
ADU Preemption
California state law preempts local ADU rules — local governments cannot impose stricter standards.
View California preemption detailsFrequently Asked Questions
Can I build an ADU in Fresno?
Yes. Fresno, CA allows accessory dwelling units. On a single-family lot you can build 1 ADU + 1 JADU per single-family lot.
How big can an ADU be in Fresno?
The maximum size for a detached ADU in Fresno is 1,200 square feet. A Junior ADU (JADU) can be up to 500 square feet.
How long does it take to get an ADU permit in Fresno?
The typical ADU permit timeline in Fresno is The permitting agency shall either approve or deny the application to create or serve an accessory dwelling unit within 60 days from the date the permitting agency receives a completed application if there is an existing single-family or multifamily dwelling on the lot.. Total estimated permit fees are $1,500–$7,000 total permit fees — generally lower than coastal California cities.
Do I need extra parking for an ADU in Fresno?
Fresno parking rules for ADUs: No additional parking required for ADUs within one-half mile of Fresno Area Express (FAX) BRT or high-frequency bus routes. No replacement parking when garage converted to ADU. Per California Gov Code §66322(a)(1) and §66314(d)(11) (Stats. 2024 Ch. 7 §20).
Do I have to live on-site to have an ADU in Fresno?
Owner-occupancy requirement in Fresno: No additional standards, other than those provided in Section 66314, shall be used or imposed, including an owner-occupant requirement.
Source: Fresno Municipal Code Article IV, Section 15-2741 — Accessory Dwelling Units; California Government Code §§66314–66333 (Stats. 2024 Ch. 7 §20). Last verified April 6, 2026. View source