ADU & Room Additions in Los Angeles, CA
Real square footage — designed, permitted, and built by one team.
ADUs & Additions for Los Angeles homeowners
Los Angeles homeowners trust A1 Builders for ADU & room additions. LA's housing stock runs from Spanish bungalows to modern builds, so every kitchen, bath, repaint, and roof is tailored to the home — and we navigate LADBS permitting, including ADU plan check, so you don't have to.
LA has some of the most ADU-friendly permitting in the state, and we navigate LADBS plan check for homeowners from Mar Vista to Highland Park regularly — detached units, garage conversions, and additions that add real rental or family living space without a full move.
Whether you need space for a growing family, an aging parent, a home office, or rental income, adding square footage is one of the biggest-impact projects a homeowner can take on — and one of the most complex to get right. A1 Builders manages ADUs and room additions end to end: feasibility and design, structural engineering, the full permit set, and every trade from foundation to final finish. California's streamlined ADU rules have made adding a unit more accessible than ever, and we know how to navigate LA and Orange County's specific permitting process so your project moves without stalling in plan check.
We serve West LA, Mar Vista, Eagle Rock, Highland Park, and the rest of Los Angeles (Los Angeles County).
ADUs & Additions problems we solve in Los Angeles
- Needing more living space without the cost and upheaval of moving
- Wanting rental income or multigenerational living space but unsure where to start
- An underused garage that could become real, permitted living space
- Juggling a separate architect, engineer, and contractor with no one owning the outcome
Our ADU & room additions process
- 1
Free Feasibility Consult
We assess your lot, existing structures, and local rules, and lay out what's realistically possible.
- 2
Design & Engineering
We develop plans and structural engineering sized to your goals, lot, and budget.
- 3
Permitting
We prepare and submit the full plan set and manage plan check with the city.
- 4
Foundation, Framing & Systems
Footings, framing, plumbing, electrical, and HVAC built to code and inspected at every stage.
- 5
Finish & Walkthrough
Interior and exterior finishes completed, final inspection passed, and the space handed over — backed by our workmanship warranty.
ADU & Room Additions in Los Angeles — FAQs
Ready for ADU & room additions in Los Angeles?
Book a free, no-pressure consultation. We'll talk through your goals and budget, then follow up with a clear, fixed-price proposal.