ADU Construction · Los Angeles County
ADU Construction in Los Angeles County
We coordinate design, permitting, and construction for ADUs across Los Angeles County — from garage conversions in the City of LA to detached units in Pasadena, Long Beach, Glendale, and beyond. Permits-to-turnkey delivery by a licensed GC.
- Plans & permitting support
- Clear written estimates
- Licensed GC · License #1124836
Free ADU Feasibility Call
Serving LA County. We review every request and contact you with next steps.
ADU Types
ADU options we build in Los Angeles County.
Whether you're converting a garage or building new, we help you choose the right ADU path for your property.
Garage Conversion ADU
Convert an existing garage into a permitted, livable unit — often the fastest and most cost-effective ADU path.
Detached ADU
A new, free-standing structure on your property — typically the most flexible in design and layout.
Attached ADU
A new unit added to your existing home, sharing one or more walls with the primary residence.
JADU
A Junior ADU built within the existing footprint of your home, up to 500 sq ft.
Our Process
A clear, organized ADU process — from idea to keys.
We coordinate planning, permits, and construction so you have one team and one written contract.
- 1
Free feasibility call
We discuss your goals, lot, and zoning to confirm what's possible.
- 2
Plans & design
Coordination with licensed design professionals to develop plans for your property.
- 3
Permitting
Plan check submittals, corrections, and city coordination.
- 4
Construction
Site prep, foundation, framing, MEP, finishes — managed under one contract.
- 5
Final inspection & turnover
Inspections, sign-off, and a clean turnover of your finished ADU.
Costs
ADU cost ranges.
Every project is different — these ranges are typical for projects in Southern California. We provide a clear written estimate after a feasibility call.
- Garage conversion ADU$90k–$180k
- Detached ADU (new build)$180k–$400k+
- Attached ADU$160k–$350k
- JADU$60k–$140k
Ranges exclude permit fees, utility upgrades, and site-specific conditions.
Timeline
Typical ADU timeline.
From plans through final inspection. Actual schedules depend on city, scope, and site conditions.
- Feasibility & design2–6 weeks
- Permitting & plan check2–6 months
- Construction4–8 months
- Inspections & turnover2–4 weeks
Permitting Help
We handle the permit process across LA County.
ADU rules differ by jurisdiction. We coordinate plan check submittals, corrections, and inspections so you don't have to navigate it alone.
- Zoning and feasibility review
- Plan check submittals
- Corrections & resubmittals
- Inspection coordination
- Utility and setback guidance
Why Build Construction Corporation
- Licensed General Contractor (License #1124836)
- Permits-to-turnkey ADU delivery
- Serving Los Angeles County and Orange County
- Clear written estimates and contracts
- Organized project communication
FAQ
ADU questions in Los Angeles County.
Common questions homeowners ask before starting an ADU project.
Get Started
Ready to explore an ADU in LA County?
Tell us about the property and what you have in mind. We'll review the scope and follow up with next steps. If you are still exploring, the property planner is an optional starting point.
Free ADU Feasibility Call
Tell us about your property and we'll contact you with next steps.
Planning a project?
Send us your project details and we'll respond with next steps and a clear written estimate.