The reality of permitting an ADU in Los Angeles
The City of Los Angeles processes more ADU permits than any other city in America. LADBS has streamlined the process dramatically since 2020, but it still takes longer than most homeowners expect. Plan for 8–14 weeks of plan check on most submissions.
This guide walks through every step.
Step 1: Confirm eligibility
- Single-family or multifamily zoning (most LA residential lots qualify)
- Property is not in a Very High Fire Hazard Severity Zone for certain restrictions
- ADU footprint fits within state setbacks (4 ft side, 4 ft rear)
Step 2: Pull a property profile
LA's ZIMAS tool (zimas.lacity.org) shows your zoning, lot dimensions, hillside/coastal overlays, historic preservation status, and any easements. Pull this before you spend a dollar.
Step 3: Decide on design path
- Pre-approved plan: LA maintains a Pre-Approved ADU Plan program with 15+ designs. Choosing one cuts plan check from 12 weeks to 4–6 weeks.
- Custom design: Allows full personalization but adds 6–10 weeks.
Step 4: Assemble required documents
- Site plan with dimensions, setbacks, utility locations
- Floor plans
- Elevations (all four sides)
- Foundation plan + structural calcs
- Title 24 energy compliance report
- Solar PV plan (required for new construction)
- Soils report (if hillside or required by LADBS)
Step 5: Submit through LADBS BuildLA
Permits are submitted online at planlacheck.lacity.org. Expect 2–3 plan check correction cycles for custom designs; 0–1 for pre-approved plans.
Step 6: Pay permit fees
LA permit fees for a typical 700 sf detached ADU:
- Plan check: $1,800–$3,200
- Permit issuance: $3,500–$6,000
- School district fee: $7,200–$11,000
- Sewer fee: $1,500–$3,500
- Solar PV permit: a property-specific written estimate
- Misc: $500–$1,200
- Total: $14,900–$25,600
Step 7: Construction with inspections
LADBS inspections during construction:
- Foundation rebar inspection (before concrete)
- Underground plumbing
- Framing + rough electrical/plumbing/mechanical
- Insulation
- Drywall (pre-finish)
- Final inspection + certificate of occupancy
Common rejection reasons
- Missing or incorrect Title 24 calcs
- Setback or height violations
- Missing soils report on hillside lots
- Insufficient parking analysis on lots requiring it
- Solar PV plan not aligned with utility provider standards
How Vision ADU handles LA permits
We handle the entire LADBS process in-house. Our average plan check cycles for LA submissions in 2025: 1.4 (pre-approved plans) and 2.6 (custom). Book a free site evaluation and we will tell you exactly what your LA permit timeline and budget will look like.
Frequently Asked Questions
How long does an LA ADU permit take in 2026?
4–6 weeks for pre-approved plans, 8–14 weeks for custom designs.
How much do LA ADU permits cost?
$15k–$26k for typical 600–900 sf detached ADUs, including all required fees.
Can I bypass LADBS for an ADU permit?
No. LADBS has exclusive jurisdiction over building permits in the City of LA.
Does LA have pre-approved ADU plans?
Yes — the LA ADU Standard Plan Program offers 15+ pre-approved designs that cut permit time dramatically.
Can I build my LA ADU before permits are issued?
No. Pre-permit construction can result in stop-work orders, double fees, and forced demolition.
Related Vision ADU Resources
- ADU Plans and Design Resources in California (2026)
- ADU Floor Plans by Size: Studio to 2-Bedroom (California 2026)
- SB 9 vs ADU in California: Which Path Is Right for Your Property? (2026)
- AB 1033 ADU Condo Conversion in California: Selling Your ADU Separately (2026)
- ADU Contractor in Riverside
- ADU Contractor in Irvine
- Los Angeles County ADU Builder
- Orange County ADU Builder
- Inland Empire ADU Builder
- 2026 ADU Cost Calculator
- All Vision ADU Service Areas