ADU Permit Guide for City of San Diego (2026)

Vision ADU San Diego ·

City of San Diego is one of the most ADU-friendly cities in California

The City of San Diego has streamlined ADU permitting more than most California cities. Pre-approved plans, fee waivers, and clear permit pathways make SD a leader.

Timeline overview

  • Plan submission to issuance: 4–8 weeks (pre-approved plans 2–4 weeks)
  • Construction: 12–20 weeks
  • Total contract to keys: 6–9 months

Fees (2026)

  • Building permit: $4,500–$8,500
  • Plan check: $1,500–$3,500
  • School fees: $4.79/sf (~$2,400 on 500 sf)
  • Capacity fees (water/sewer): $3,000–$8,000
  • Total typical: $11,000–$22,000

Pre-approved plans

The City of San Diego maintains a free pre-approved ADU plan catalog covering 30+ designs from 500–1,200 sf. Using pre-approved plans cuts permit time roughly in half and reduces design fees by $6k–$15k.

Required submittals

  • Site plan stamped by surveyor or licensed designer
  • Floor plans, elevations, sections
  • Foundation/structural plans
  • Title 24 energy calcs
  • Mechanical/electrical/plumbing
  • Solar PV plan (required for new detached)
  • HERS testing plan
  • Stormwater BMP if disturbing 500+ sf

Common pitfalls

  • Encroachment into front yard setback
  • Missing CalGreen tier required documentation
  • Solar plan not stamped by qualified solar designer
  • Water meter sizing too small for added fixture units

Coastal Zone projects

If your property is in the SD Coastal Zone, you need separate Coastal Development Permit (CDP) review. Adds 2–4 months and $3k–$8k in fees.

Vision ADU handles it all

We handle every permit interaction in-house. Book a free site evaluation.

Frequently Asked Questions

How long does an ADU permit take in San Diego in 2026? 4–8 weeks for custom plans; 2–4 weeks for pre-approved plans.

What are San Diego ADU permit fees? $11,000–$22,000 typical including all city fees.

Can I use pre-approved plans in San Diego? Yes — the City of SD offers a free pre-approved plan catalog.

Do San Diego coastal ADUs need extra review? Yes — Coastal Zone properties need a Coastal Development Permit.

Is owner occupancy required in San Diego? For JADUs yes; for standard ADUs no (except in some HOA-restricted communities).

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