ADU Construction in Los Angeles in Beverly Hills
Serving 90210 · 90211 · 90212 and West Hollywood, Bel Air, Westwood
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 Beverly Hills
Every neighborhood has its own architectural character, permit jurisdiction, and finish-level expectations. Here's how we approach adu construction in los angeles in Beverly Hills specifically.
Beverly Hills permit nuances
Beverly Hills runs its own building department (separate from LA City). Permit timelines and requirements differ from neighboring areas — designated historic homes have additional review. We handle the entire process so you don't have to navigate it.
Working in landmark zones
Many BH homes are in landmark or historic-preservation zones with exterior alteration limits. We design around those constraints rather than fight them.
Finish-level expectations
Beverly Hills clients typically expect high-end finishes — slab countertops, full custom cabinetry, high-grade appliances. We source through trade channels to keep finish quality high without unnecessary markup.
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 Beverly Hills
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.
City of Beverly Hills Building & Safety handles all permits — separate from LA County. Plan checks typically run 3–6 weeks for kitchen remodels, longer for structural work or historic-zone properties.
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.
How long does a kitchen remodel take in Beverly Hills? +
Plan for 4–6 weeks of design, 4–6 weeks of permits, then 8–14 weeks of construction. Total: 4–7 months from first conversation to final walkthrough. Historic-zone properties run longer.
Do you work in 90210? +
Yes — we're a few miles east in mid-city LA, so all of Beverly Hills (90210, 90211, 90212) is in our regular service area. Most of our team is on-site at your property.
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 Beverly Hills?
Onn personally reviews every inquiry. Tell us about your project — Onn will be in touch within one business day.