ADU Rules in Fresno, CA (2026)

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 actively preempts local restrictions, making ADU approval a streamlined ministerial process. In Fresno, the Fresno Development and Resource Management Department (DARM) — Building Division 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: up to 1200 sq ft (max height: 16 feet). Attached ADU: 50% of primary dwelling up to 1200 sqft. Junior ADU (JADU): up to 500 sq ft — must be within the existing primary dwelling or accessory structure. Detached ADU maximum 1,200 sqft per California Gov Code 65852.2(c)(2)(B). JADU maximum 500 sqft within existing space of primary structure per Gov Code 65852.22. Fresno's Central Valley construction costs (lower than coastal CA) make larger ADUs economically feasible for rental income. Fresno Municipal Code Section 15-2741.

Permit Fees

ADU Permit Fees in Fresno: Plan check fee: $400–$2,000 depending on project value. Building permit fee: $800–$4,000 depending on valuation. Impact fees: None. School fees: Exempt for ADUs under 750 sqft. ADUs 750+ sqft subject to Fresno Unified School District developer fees.. Total estimated permit cost: $1,500–$7,000 total permit fees — generally lower than coastal California cities. Impact fees waived for ADUs under 750 sqft per Gov Code 65852.2(f)(3). Fresno's permit fees are typically lower than Bay Area or LA metro cities due to lower construction cost baselines. Fresno Metropolitan Flood Control District (FMFCD) fees may apply for drainage improvements on some parcels. Fee schedule: https://www.fresno.gov/darm/fees/

Permit Timeline

Fresno ADU Permit Timeline: Fresno DARM processes ADU permits through the online Development Portal. Ministerial approval within 60 days for compliant applications. Standard plan review: 3-5 weeks. Fresno offers streamlined review for ADUs using pre-approved plan sets. Construction typically 3-8 months — Central Valley contractors often have lower lead times than coastal CA. Apply through the Fresno Development and Resource Management Department (DARM) — Building Division online permit portal. Phone: (559) 621-8000.

Setback Requirements

ADU Setback Requirements in Fresno: Front setback: Same as zone standard. Side setback: 4 feet. Rear setback: 4 feet. 4-foot side and rear setbacks per California Gov Code 65852.2(c)(2)(E). Many Fresno properties have larger rear yards than coastal CA due to lower land costs — detached ADUs often feasible in rear yard. Front setback follows applicable zone standard — RS zones typically require 15-20 ft front setbacks.

Parking Requirements

Parking Requirements: 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. Fresno is primarily car-dependent but several FAX bus rapid transit corridors provide transit proximity exemptions. Per California Gov Code 65852.2(d).

Restrictions & Requirements

• •ADU must comply with Fresno Municipal Code objective zoning and design standards
• •ADU cannot be sold separately from primary dwelling (unless SB 9 lot split 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: 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. Fresno's large lot sizes in RS zones often accommodate both a detached ADU and a JADU within the same property — state law permits both. Fresno's relatively affordable land makes multifamily infill ADUs economically compelling.

State Law & Preemption

Historic District Considerations

Frequently Asked Questions