Serving 90049 and Bel Air, Pacific Palisades, Santa Monica
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.
Every neighborhood has its own architectural character, permit jurisdiction, and finish-level expectations. Here's how we approach adu construction in Brentwood specifically.
LADBS handles Brentwood. Hillside-zone properties (most of north of Sunset) trigger additional grading and slope-stability review. Plan check timelines: 6–10 weeks for kitchens, 8–14 weeks for hillside structural work.
Brentwood Village lots run 50'×130' typical, while hillside lots are larger but constrained by slope. ADU additions are feasible in both but the design approach is very different. We assess feasibility before promising scope.
Brentwood clients typically expect upper-mid to high-end finishes — slab counters, custom cabinetry, Bosch/Wolf-tier appliances. We source through trade channels to keep finish quality high without unnecessary markup.
The Brentwood ADU client mix tilts toward home-office, guest-suite, or in-law housing rather than open-market rental. Program reflects that: full kitchen but on a smaller scale, one bed plus one bath, separate entrance from the main house, and finish matching the main residence rather than rental-grade.
Typical Brentwood R-1 parcels support detached ADU placement with required setbacks, even at the upper end of state-law maximum size. North-Brentwood hillside parcels add the constraint of slope but generally still support placement. We site-walk the parcel against the actual survey before committing to a specific footprint — the survey often reveals constraints (mature trees, easements, drainage paths) that the parcel sketch doesn't show.
Brentwood ADU projects more commonly include integrated landscape design (pathway from main house, outdoor seating, plantings around the ADU) than the average LA ADU. That adds scope but produces a coherent property-level outcome rather than a standalone shed-on-the-lot feeling. We coordinate with the client's landscape designer (or recommend one) early in design rather than after the ADU is already built.
Lot review, setbacks, height limits, utility access, soil assessment. We tell you up front whether your project pencils — square footage, code constraints, expected timeline.
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).
Plan check submission, energy compliance (Title 24), structural engineering, separate or shared utility service. We deal with LADBS or your municipal building department.
New foundations or attached construction, framing, mechanical/electrical/plumbing (MEP) rough-in, exterior, and full interior finishes — kitchen, bath, flooring, HVAC, electrical.
Final inspections, Certificate of Occupancy, and walkthrough. We hand you a unit you can live in, rent, or use as a guest house.
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.
LA Department of Building and Safety (LADBS) handles permits. Hillside-zone properties require additional review. Plan check typically 6–10 weeks for kitchens, longer for structural or hillside work.
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I was nervous at first, but the team at Design Onn Point was extremely communicative and made me feel comfortable. They arrived on time each day, kept me updated, and answered all my questions. The crew was professional,…
Design Onn Point turned my kitchen into a beautiful space. The professional was knowledgeable, polite and kept everything on schedule. I love the modern kitchen layout and the quality of the custom kitchen cabinets. High…
Design Onn Point was a delight from start to finish. The team was incredibly communicative, always answering my questions quickly and keeping me in the loop. They were punctual, showing up on time every day, and their pr…
Free consult, no obligation. Onn personally reviews every inquiry — usually replies within 1 business day.
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.
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.
Yes. The flat-lot homes are some of our favorite to work on — older bones, charming proportions, room to upgrade systems while preserving character.
Older hillside Brentwood homes occasionally have settled or stepped foundations that affect remodel plans. We bring in licensed structural engineers during design to assess before scope is locked.
Side-by-side comparison of detached ADUs and garage conversions for LA homeowners — costs, timelines, ROI, rental income, and which one adds more value on resale.
When you need a permit for an LA kitchen remodel, how LADBS plan-check works, typical timelines, and how to avoid the common mistakes.
Onn personally reviews every inquiry. Tell us about your project — Onn will be in touch within one business day.