Fast, Reliable New Detached ADU Across Beverly Hills
A new detached ADU in Beverly Hills typically costs $310,000-$480,000 all-in, from architectural drawings and the Beverly Hills design-review application through final inspection. The two variables that move that number most are your specific lot’s utility path through Beverly Hills Public Works and whether you’re building in the flats or in a hillside fire zone north of Sunset. We’re Ellery ADU Studio, and we’ve designed, permitted, and built detached ADUs in Beverly Hills since 2015, with a written price fixed before any work starts. Call (971) 497-2402 to schedule a free estimate, and we’ll walk your property and name the actual line items in writing.
Why Ellery ADU Studio Is Beverly Hills’s Preferred New Detached ADU Company
We don’t treat Beverly Hills as a side market. The city runs its own planning department, its own building inspectors, and its own utility system, so every fee schedule, timeline, and correction notice is different from what applies a block east into LA City. Our permit sets are written for Beverly Hills reviewers specifically, with exterior elevations that anticipate the design-review board’s matching requirement rather than hoping for a courtesy waiver.
Our clients in Beverly Hills are homeowners who bought well and now want to add a long-term asset without turning their estate into a construction site for eighteen months. That’s the audience we build for. Under Haven Standard Clause 1, your written price is locked before any work starts, and under our 365-Day Done Right Promise, if the finished ADU is not built to the permitted drawings, we make it right in writing. Owner Nadia Ellery reviews every Beverly Hills permit set before it goes to the city.
When you call (971) 497-2402, a live person answers. No voicemail queue. If you’re already holding a written estimate from another builder, bring it in and we’ll give you a free second opinion on the line items.
Our New Detached ADU Services in Beverly Hills
Custom Built ADU
A custom built detached ADU in Beverly Hills means architect-stamped plans that match the primary structure’s architectural language, whether that’s a 1920s Spanish Colonial Revival on Roxbury Drive or a mid-century modern on a hillside parcel above Sunset. The Beverly Hills design-review process requires the ADU’s exterior to read as continuous with the main house, so we design from the lot inward: roofline, window pattern, stucco color, trim profile. This is not a catalog unit with a paint job.
Expect 8-12 months from initial survey to final inspection, with the design-review hearing typically consuming 6-10 weeks of that depending on the board’s calendar. Our contract includes the full permit set, the structural engineering, the Beverly Hills Public Works utility application, and the build itself, as one written price.
Prefab ADU Installation
For Beverly Hills homeowners who want a faster on-site build, we specify and coordinate prefab systems from Abodu, Cover, and Dvele within the same single contract. The prefab chassis arrives at the lot and we handle foundations, utility connections through Beverly Hills Public Works, and all finish work. A prefab in the Beverly Hills flats typically runs $285,000-$390,000 delivered and installed, though design-review requirements can push that number up if the city requires exterior modifications to match the primary structure.
We’ll tell you honestly whether a prefab makes sense for your lot before you commit. A tight hillside parcel with steep access off Coldwater Canyon may cost more in crane work than a custom stick build would save.
Modular ADU
Modular ADUs differ from panelized prefab in that sections arrive with much of the finish work already in place. For Beverly Hills estates built between the 1920s and 1960s, this is often the right call on a flat lot with clear side access. A modular detached ADU in Beverly Hills, including the Public Works sewer and water connection, typically runs $300,000-$420,000 depending on finishes and site conditions.
Mighty Buildings is a brand we’ve specified on several Beverly Hills projects, particularly where the client wants a modern form that still clears design review with a carefully matched facade. The design-review board cares most about street-facing elevérations; a modular unit with a well-detailed exterior wrapper has passed here repeatedly.
Studio ADU
A studio ADU on a Beverly Hills lot works best where the primary residence is already large and the goal is rental income or a guest suite without adding a second full bathroom complex. Expect roughly 400-600 square feet, one bath, a kitchenette, and a separate entrance. Studio ADUs in Beverly Hills typically run $240,000-$320,000 all-in, with hillside fire-zone requirements north of Sunset adding $15,000-$30,000 in Chapter 7A upgrades: ember-resistant vents, Class A roofing, dual-pane windows.
On flats-area estates off Santa Monica Boulevard or Wilshire, a studio ADU is often the fastest path to a rentable unit because the utility connection is shorter and the design-review board sees a smaller footprint as less visually disruptive.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Beverly Hills
We specify, coordinate, and install prefab and modular systems from Abodu, Cover, Dvele, and Mighty Buildings. For Beverly Hills clients, we hold product availability conversations early because design-review timelines can shift a project by months. The studio maintains a current library of exterior finish options from each manufacturer so your design-review submittal includes elevations the city can actually evaluate; we don’t submit a catalog photo and hope for the best. If you’ve already spoken with a prefab sales rep, bring us their proposal and we’ll fold it into a single Beverly Hills-specific contract.
Common New Detached ADU Problems We See in Beverly Hills Homes
- Electrical panels that were undersized in 1955 and never touched since. Many Beverly Hills estates off Sunset and in the flats still run on the original panel, and a new detached ADU with a kitchen and laundry will add 60-100 amps of load. The inspector will flag it after drywall if it wasn’t caught at rough-in, and that means cutting back into finished walls. We inspect the existing service before the permit set is finalized.
- Detached garages from the 1920s-1940s with zero seismic reinforcement. Unreinforced masonry and post-and-beam frames from that era were never designed for lateral loads. Converting one into an ADU means a structural retrofit, and that is a line item we write into the contract before work begins, not a change order you learn about at framing.
- Slab foundations with no waterproofing. Older Beverly Hills garage slabs were poured as parking surfaces, not living space. Moisture wicks up through them. We test for it and price the mitigation in the initial written scope.
- Beverly Hills Public Works connections treated like LA DWP. If the sewer and water capacity application isn’t filed at rough-in, a nearly finished ADU can sit for weeks waiting on inspection queues. We file early and name the fee in your contract line items.
Pricing for New Detached ADU in Beverly Hills, CA
A detached ADU in Beverly Hills runs $310,000-$480,000 turnkey, drawings through final inspection. A studio ADU on a flat lot starts around $240,000, a one-bedroom in the $280,000-$350,000 range, and a two-bedroom with hillside fire-resistive construction can reach $480,000 or more. Prefab and modular options compress the on-site schedule but rarely lower the finished price below $285,000 once design-review matching and Public Works connections are accounted for.
Whatever the final number, it is a written number before work starts. Haven Standard Clause 1, no exceptions. Call (971) 497-2402 and we’ll walk your lot, measure your existing panel, check your sewer lateral, and hand you a written estimate with real dollar figures.
We Also Serve Cities Near Beverly Hills
Our Beverly Hills team works these streets daily, and we handle the same level of documentation and written-pricing discipline in West Hollywood, Studio City, Universal City, and Culver City. Each city runs its own permitting track, so we maintain separate submittal standards for each jurisdiction. If you’re a block into LA City or nearby West Hollywood, you still get the same fixed written price. See our full New Detached ADU service detail for what the contract covers in every market.
Serving Beverly Hills, CA - Our Local Coverage Area
We’re based in the Beverly Hills area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - New Detached ADU in Beverly Hills
The Beverly Hills design-review board requires your ADU’s exterior to architecturally match the primary structure, meaning rooflines, trim, stucco or siding material, and window style all get evaluated against the main house. This is a separate hearing from the building permit itself, and it happens before construction documents are approved. For a 1920s Spanish Colonial Revival in the flats, that might mean red clay roof tile, wood-framed windows, and a side-elevation treatment that reads as original. For a mid-century on a Trousdale Estates hillside, it means clean lines and repeated horizontal planes. We prepare the design-review submittal with elevation drawings and material schedules ready for board comment. Call (971) 497-2402 to see sample submittals from approved Beverly Hills projects.
Yes. Trousdale Estates and the Benedict and Coldwater Canyon-adjacent parcels north of Sunset fall within California’s Wildland-Urban Interface, which triggers Chapter 7A fire-resistive standards for new ADU construction. That means ember-resistant vents, Class A roofing assemblies, and dual-pane or multi-pane windows. It also means the framing inspection includes specific fireblocking details. This adds measurable hard cost over a comparable flats-area project; we price those items explicitly in your written contract rather than discovering them at inspection. Call (971) 497-2402 for a WUI checklist specific to your hillside lot.
Beverly Hills operates its own water and sewer utility system entirely separate from LA DWP, so capacity charges, connection fees, and inspection scheduling for your new detached ADU run through Beverly Hills Public Works. A contractor who files an LA DWP connection from habit will stall the project at rough-in, because Beverly Hills issues different permits and inspects on a different queue. We file the Public Works application at the same time we submit the building permit set, and we name the capacity charge as a line item in your written price. Call (971) 497-2402 and ask us to walk your specific sewer lateral and water service size before you sign anything.
We already know before we open it. Our initial survey includes a panel inspection and a visual check of the existing electrical system, so if a 1930s garage on a flats-area estate still has knob-and-tube wiring, we’ll see it coming and write the panel upgrade and rewiring into your contract from the start. If we open a wall and find something the survey couldn’t reach, we document it with photos, price the correction in a written change order, and get your approval before touching another stud. No door-side upsells, no scope creep-that’s Haven Standard Clause 5. Call (971) 497-2402 and we’ll show you what our photo record looks like on a similar Beverly Hills conversion.
Yes, and we’ve done it repeatedly. The design-review board cares about the street-facing elevation, not whether the unit was framed in a factory. We specify exterior treatments from Abodu, Cover, Dvele, and Mighty Buildings that are compatible with Beverly Hills matching requirements, then submit elevation drawings that show how the finished unit will read against the primary house. The board has approved modern prefab forms on Beverly Hills lots when the exterior materials and proportions were presented properly. Call (971) 497-2402 and we’ll show you examples of prefab ADUs that cleared Beverly Hills design review.
Ready for a written price on your Beverly Hills detached ADU? Call (971) 497-2402 to schedule a free on-site estimate. We’ll walk the lot, check the existing panel and sewer lateral, and hand you a written number before any work starts.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving Beverly Hills since 2015.