ADU Construction in Los Angeles in Westwood
Serving 90024 · 90025 and Bel Air, Brentwood, Century City
California's ADU laws have made backyard units one of the highest-leverage property improvements an LA homeowner can make. We design and build all three types — detached new builds, attached additions, and JADUs (Junior ADUs converted from existing space). End to end. Permits, plans, foundations, framing, finishes, and final inspections, all under one roof. You work directly with Onn from feasibility study through certificate of occupancy.
ADU Construction in Los Angeles specifically for Westwood
Every neighborhood has its own architectural character, permit jurisdiction, and finish-level expectations. Here's how we approach adu construction in los angeles in Westwood specifically.
Condo HOA realities
Most Westwood condos require HOA approval before construction starts. This adds 4–8 weeks to the timeline. We coordinate the HOA submission and answer their questions during their review.
Construction hours
Most condos limit construction to weekdays, 9 AM–5 PM. We schedule projects accordingly — slower than a single-family pace but predictable.
Single-family south of Wilshire
Standard mid-century homes here often have aging electrical, original plumbing, and tight footprints. We plan for systems modernization during any kitchen/bath project.
What we handle
Feasibility & site planning
Lot review, setbacks, height limits, utility access, soil assessment. We tell you up front whether your project pencils — square footage, code constraints, expected timeline.
Architectural design
Floor plans, elevations, 3D renderings. We design to maximize functional space within California's ADU size limits (up to 1,200 sq ft detached, 850 sq ft for studios/1-bedroom).
Permits & utilities
Plan check submission, energy compliance (Title 24), structural engineering, separate or shared utility service. We deal with LADBS or your municipal building department.
Foundation, framing, finish
New foundations or attached construction, framing, MEP rough-in, exterior, and full interior finishes — kitchen, bath, flooring, HVAC, electrical.
Final inspection & C of O
Final inspections, Certificate of Occupancy, and walkthrough. We hand you a unit you can live in, rent, or use as a guest house.
Pricing in Westwood
Typical detached ADU build cost in Los Angeles, all-in (design, permits, construction, finishes, utility hookups). Attached ADUs typically run lower; JADUs converting existing space lower still.
LADBS handles Westwood permits. Condo projects require HOA approval before permits — 4–8 weeks added timeline. Condos may also require additional fire-suppression review.
Frequently asked
How big can my ADU be in Los Angeles? +
California state law allows detached ADUs up to 1,200 sq ft (or larger if your local jurisdiction permits). Attached ADUs are limited to 50% of the primary home's square footage or 1,200 sq ft, whichever is less. Junior ADUs (JADUs) are capped at 500 sq ft and must be inside the existing primary structure.
How long does an ADU project take? +
Plan to design and build a detached ADU in 9–14 months total: 2–3 months for design and permits, 6–10 months for construction. Attached ADUs and JADU conversions can run shorter.
Do you work in condos? +
Yes — condo remodels are a regular part of our work. We coordinate HOA approvals, freight-elevator scheduling, weekday-only construction, and protect adjacent units.
How long does a Westwood condo kitchen take? +
Add 4–8 weeks to the standard kitchen timeline for HOA approval. Total project typically 5–7 months from first conversation to final walkthrough.
From the blog
ADU vs Garage Conversion: Which Makes Sense for Your LA Property?
A clear-eyed comparison of detached ADUs, attached ADUs, JADUs, and garage conversions for LA homeowners — costs, timelines, ROI, and which one fits your lot.
LA County Kitchen Permits Explained (2026 Edition)
When you actually need a permit for a kitchen remodel in Los Angeles, how the plan-check process works, typical timelines for LADBS and surrounding cities, and how to avoid the common mistakes.
ADU Construction in Los Angeles in other neighborhoods
Live in Westwood?
Onn personally reviews every inquiry. Tell us about your project — Onn will be in touch within one business day.