Building ADUs & additions across Los Angeles County.
One coordinated design + build team for ADUs, garage conversions, and home additions from the San Fernando Valley to the coast — headquartered in Woodland Hills.
Los Angeles County is one of the most complex jurisdictions in California for residential construction — dozens of independent cities, LA County unincorporated areas, hillside overlays, coastal zones, and Very High Fire Hazard Severity Zones. HomeAdd's LA County work focuses on getting feasibility right before design starts, so homeowners aren't surprised by zoning, fire access, or utility upgrades later.
Our office in Woodland Hills keeps most of the San Fernando Valley within a short drive, and we regularly work west into the coast, south into the LA basin, and east into the Pasadena / San Gabriel Valley area.
Representative LA County cities we've worked in
Cities named are examples of our regional coverage, not project addresses. We also work in neighboring communities on request.
LA County city guides
Detailed pages covering the reviewing department, local site conditions, and the ADU types that work best in each area:
Relevant HomeAdd services in LA County
LA County planning & permits — who actually controls your project
Every incorporated city in LA County has its own planning and building department, and their own ADU rules on top of California state law. The City of Los Angeles (LADBS) is only one of those departments — homeowners in Beverly Hills, Culver City, Santa Monica, Pasadena, Long Beach, and dozens of other cities go through those cities' departments, not LADBS.
For parcels in unincorporated Los Angeles County, LA County Public Works and LA County Planning are the reviewing agencies. We identify the correct department during feasibility and align design, Title 24, and site work with their specific submittal requirements.
- LADBS Approved Standard Plans (City of Los Angeles) Applies only to projects inside the City of Los Angeles. Other LA County cities have their own building departments.
- California HCD ADU Handbook State-level ADU baseline rules that every California jurisdiction has to permit at minimum.
Common site considerations in LA County
- Hillside lots and grading permits, especially in the Santa Monica Mountains and north Valley.
- Very High Fire Hazard Severity Zones — material, ember, and access requirements.
- Coastal Zone review for parcels west of PCH.
- Historic Preservation Overlay Zones (HPOZ) in parts of the city.
- Older electrical services (100A or below) that need upgrading for a new ADU.
- Sewer lateral condition on older parcels in the Valley and Westside.
Frequently asked questions
Do you build ADUs everywhere in Los Angeles County?+
We regularly work across LA County — the San Fernando Valley, Westside, South Bay, and greater LA. Every project depends on the specific city's rules, so we start with a feasibility check for your address before scoping design.
Are LADBS Approved Standard Plans available anywhere in LA County?+
LADBS Approved Standard Plans only apply to projects inside the City of Los Angeles. Other cities in LA County (Beverly Hills, Culver City, Santa Monica, Pasadena, Long Beach, and many more) use their own building departments and their own plan-check processes.
How long does a typical LA County ADU take?+
Timelines vary widely with jurisdiction, site conditions, and utility work. Design and permitting typically run several months, and on-site construction runs several months more. Hillside and coastal parcels add time.
Do you handle hillside and Very High Fire Hazard Severity Zone projects?+
Yes. Hillside lots and Very High Fire Hazard Severity Zones require additional design coordination around fire access, materials, and grading. We plan for these constraints during feasibility rather than after design.