ADU Permits in Fresno: Complete Step-by-Step Guide (2026)

We've pulled more than 40 ADU permits with the City of Fresno's Development & Resource Management Department since California's ADU laws expanded in 2020. The process is more homeowner-friendly than ever, but the paperwork still trips people up. This is the actual workflow — no fluff.

Step 1 — Confirm Your Lot Is Eligible

Under current California law (Gov. Code §65852.2) and the City of Fresno's adopted ADU ordinance, virtually every single-family and most multi-family lots in Fresno are eligible for at least one ADU and one Junior ADU (JADU). Lot size minimums were eliminated statewide in 2023.

• Detached ADU — up to 1,200 sq ft, max 16' height (18' near transit, 25' for two-story under SB 897)
• Attached ADU — up to 50% of primary dwelling or 1,200 sq ft, whichever is less
• JADU — up to 500 sq ft, must be within existing primary structure
• Setbacks — 4 ft side and rear (state preemption overrides stricter local rules)

Step 2 — Plans, Title 24, and CALGreen Compliance

The City of Fresno requires a complete plan set: site plan, floor plans, elevations, structural details, electrical/plumbing/mechanical, and a Title 24 energy compliance report. As of 2024, all new ADUs in California must be all-electric or include solar (per the 2022 Energy Code). Gas appliances are permitted with capped square footage triggers.

Step 3 — Submit & Pay Fees

ADU permit applications are submitted through Fresno's online portal (Accela). Current fees as of Q1 2026:

• Plan check fee — $1,800 to $3,400 (based on valuation)
• Building permit — $2,200 to $5,500
• Plumbing/Electrical/Mechanical permits — $400 to $900 combined
• School district fees — $4.79/sq ft (Fresno Unified, 2026 rate; waived for ADUs ≤750 sq ft per state law)
• Impact fees — capped by state law for ADUs under 750 sq ft (zero impact fees) and proportional for larger

Total permit cost for a typical 750 sq ft detached ADU in Fresno: $4,800–$8,500 in fees. Construction itself runs $180,000–$320,000 turnkey in 2026, depending on finishes and site conditions.

Step 4 — Plan Check Timeline

California's SB 13 requires the City to approve or deny ADU applications within 60 days of a complete submittal. In our experience, Fresno's first plan check comments come back in 4–6 weeks. Plan on one round of corrections — extremely rare to clear on first review.

Step 5 — Construction & Required Inspections

1. Foundation / setback inspection — before pouring concrete
2. Underground plumbing and electrical — before backfill
3. Framing, rough plumbing, rough electrical, rough mechanical — before insulation
4. Insulation — before drywall
5. Drywall nail/screw — before mud
6. Final inspection — Title 24 verification, smoke/CO detectors, address posting, all utilities energized

Common Mistakes We See

• Skipping the soils report on lots near the San Joaquin River bluffs — expansive clay will move your slab
• Underestimating utility connections — separate water meter is optional but PG&E electrical service upgrade is often required
• DIY plan sets — Fresno's plan check kicks back non-stamped structural sheets immediately
• Ignoring SMUD/PG&E lead times — current transformer upgrades run 12–20 weeks

Real Project: 768 sq ft Clovis Detached ADU

A 2024 client in Clovis wanted a rental ADU for long-term income. We submitted plans on March 2, received first comments April 11, resubmitted April 28, received permit May 22. Construction took 17 weeks from groundbreaking to final inspection. Total turnkey cost: $241,800. The unit now rents for $2,150/month — a roughly 9-year payback at current rates.

Trusted Resources

• City of Fresno Development & Resource Management — fresno.gov/darm
• California HCD ADU Handbook — hcd.ca.gov
• CSLB License Lookup — cslb.ca.gov (verify any contractor before signing)