How long does an ADU permit take in San Diego?

Typically about 10 weeks from complete application to approval. Standard ADU permit timelines 50–75 days. Coastal Overlay Zone properties require concurrent Coastal Development Permit review under AB 462 (60-day mandate). Building permit fees $1,800–$3,000 typical.

How much does an ADU permit cost in San Diego?

All-in permit-related costs typically run $6,500–$21,000 (Andalusia Drafting 2026; Dynamic Quality Builders 2026). This includes building permit fees, plan check, and professional soft costs. Impact fees may apply for ADUs over 750 sq ft.

Do I need to replace parking when building an ADU in San Diego?

No — California state law eliminates parking-replacement requirements for ADUs within half a mile of public transit, in historic districts, in existing structures (garage conversions), or where on-street parking permits aren't required. Most San Diego ADUs qualify for at least one of these exemptions.

ADU permits · San Diego, California

San Diego ADU permit fees, timeline, and rules

Sourced permit fee ranges, typical approval timelines, and the ADU-specific rules that apply in San Diego. All numbers cross-referenced against published builder data and the city's planning department.

Last validated by OwnAdu: May 15, 2026 (manually verified)

Typical permit fees (all-in)

$6,500 – $21,000

Typical approval timeline

~10 weeks

Maximum ADU size

1,200 sq ft

Parking replacement required

No — exempt under state law in most cases

Owner-occupancy required

Setback requirements

4 ft side and rear under CA state law

Source: https://www.sandiego.gov/development-services/adu

Buying a home with an ADU in California?

State law, typical premium, what to verify on a permitted ADU, and what to do if you find an unpermitted one.

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Permit fees and timelines change. We re-validate against the source URL above each quarter.