How long does an ADU permit take in Los Angeles?

Typically about 10 weeks from complete application to approval. LADBS publishes 20+ free pre-approved standard plans that cut review to 50–70 days. Custom plans run 8–16 weeks. School impact fees apply for ADUs ≥750 sq ft. Building permit fees $1,800–$2,800 typical; construction permit fees add $2K–$10K.

How much does an ADU permit cost in Los Angeles?

All-in permit-related costs typically run $15,000–$25,000 (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 Los Angeles?

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 Los Angeles ADUs qualify for at least one of these exemptions.

ADU permits · Los Angeles, California

Los Angeles ADU permit fees, timeline, and rules

Sourced permit fee ranges, typical approval timelines, and the ADU-specific rules that apply in Los Angeles. 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)

$15,000 – $25,000

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 for ADUs ≤16 ft tall

Source: https://planning.lacity.gov/development-services/accessory-dwelling-units

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.