Fast, Reliable New Detached ADU Across Beverly Hills
New detached ADU construction in Beverly Hills typically runs $285,000-$485,000 all-in for a custom build, while prefab and modular systems installed on your lot usually fall between $195,000 and $340,000, with permits and site prep included at a single written price. We’re Ellery ADU Studio, a design-build practice that has handled ADU permitting and construction across Los Angeles County since 2015, and our crews serve Beverly Hills directly from our Los Angeles office. Call (424) 325-4322 to schedule your free estimate. Every project starts with a written price before any work begins, per Haven Standard Clause 1.
Why Ellery ADU Studio Glendale Is Beverly Hills’s Preferred New Detached ADU Company
We’ve designed, permitted, and built more than 900 ADUs since 2015, and a growing share of our recent work sits on the oversized estate lots of Beverly Hills’s Flats neighborhood. Our clients here are not weekend DIYers; they’re homeowners who bought between 2015 and 2025 at a high basis and are now treating an ADU as a long-term asset. They research before they call, and they want the price on the page. We give it to them, in writing, before a shovel hits the ground.
Our response time to Beverly Hills is same-week for initial site visits, with scheduling coordinated from our Los Angeles office. We know the independent building department at 455 North Rexford Drive, the Planning Division’s architectural compatibility review, and the specific plan-checkers who will flag composite roofing on a Spanish Colonial conversion. That local fluency saves our clients one to two months on typical resubmittal cycles.
Under Haven Standard Clause 3, every visit produces a documented photo record. Our clients in Beverly Hills receive evidence of what we found, not a summary of how it felt. And under Clause 6, our 365-Day Done Right Promise is backed in writing: if the finished ADU is not built to the permitted drawings, we make it right.
A live person answers our phones 24/7. No voicemail queue, no callback promise that doesn’t materialize.
Our New Detached ADU Services in Beverly Hills
Custom Built ADU
A custom built ADU in Beverly Hills is the only path when the Planning Division requires your new structure to match the period materials of a 1920s Mediterranean Revival or 1930s Tudor primary residence. We handle the full design-build sequence: measured drawings, permit set, architectural compatibility package, and construction under one contract at one written price. On a recent project near Carmelita Avenue in The Flats, we designed a 520-square-foot detached studio with hand-applied stucco, authentic clay tile roofing, and arched openings that mirrored the main house’s 1938 Spanish Colonial detailing. The first resubmittal passed. Custom builds in Beverly Hills typically run $285,000-$485,000 all-in, depending on finish level and foundation conditions.
Prefab ADU Installation
Prefab ADU systems from Abodu and Cover can work in Beverly Hills, but only when the manufacturer’s standard exterior palette can be modified to satisfy architectural compatibility review. We specify and coordinate these brands within our single-contract model, and we negotiate the finish upgrades upfront so they appear in your written price, not as a surprise change order. Prefab installation on a prepared site in Beverly Hills typically runs $195,000-$310,000, including the modified cladding, tile, or stucco match that the city will require. We do not recommend prefab for hillside parcels north of Sunset, where Chapter 7A fire-resistive construction requirements often exceed standard manufacturer specifications.
Modular ADU
Modular construction from Dvele or Plant Prefab offers faster factory build times, but Beverly Hills’s Planning Division still inspects the finished module against the same architectural compatibility standards as site-built work. Our role is to specify the exterior finishes during the design phase, lock them into the contract at a written price, and coordinate crane access and set-day logistics with the city’s building inspectors. Modular ADU projects in Beverly Hills typically range from $220,000 to $340,000 installed. The savings are in schedule, not in bypassing local review.
Studio ADU
A studio ADU, typically 350-450 square feet, is the most common detached unit we permit in Beverly Hills’s Flats neighborhood, where estate lots have the setback room but homeowners want minimal visual impact. We design these as full dwelling units with kitchenettes, three-fixture baths, and independent utilities, not as pool-house afterthoughts. Studio ADUs in Beverly Hills typically run $195,000-$325,000, with the lower end achievable through prefab or modular systems and the upper end reflecting custom period-matched exteriors on challenging sites.
1-Bed & 2-Bed ADU
One-bedroom and two-bedroom detached ADUs appeal to Beverly Hills homeowners who want rental income or multigenerational flexibility without altering the primary residence. These units require full kitchen facilities, separate utility meters, and compliance with the same architectural compatibility rules as smaller structures. A 1-bed detached ADU in Beverly Hills typically runs $240,000-$380,000; a 2-bed unit with full kitchen and stacked laundry usually falls between $320,000 and $485,000. The range reflects foundation conditions, utility trenching distances, and the exterior finish specification required by Planning Division review.
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 and coordinate prefab and modular systems from Abodu, Cover, Dvele, Mighty Buildings, Boxabl, Plant Prefab, Tuff Shed, and James Hardie within our single-contract model. For Beverly Hills projects, we lean heavily on James Hardie’s ignition-resistant siding products on hillside parcels where Chapter 7A compliance is mandatory, and we work with Cover and Dvele on custom exterior modifications that satisfy the Planning Division’s architectural compatibility standards. Our relationships with these manufacturers mean we can confirm lead times, finish availability, and fire-resistive specifications before your written price is finalized, not after construction starts.
Common New Detached ADU Problems We See in Beverly Hills Homes
- Period-mismatch rejections at plan check. Contractors accustomed to LA City’s permissive review routinely specify composite roofing and synthetic stucco on Beverly Hills ADUs, only to face resubmittal demands from the Planning Division. We specify authentic materials in the original permit set, priced and locked from day one.
- Undersized electrical and plumbing in converted outbuildings. The detached garages and pool houses common in The Flats often carry 60-amp sub-panels with cloth-insulated wiring and galvanized supply lines. Beverly Hills’s independent building department will not sign off until these are upgraded to modern code, a cost we inspect for and write into the contract before demo begins.
- Foundation settlement on structures built 1920s-1950s. Older detached buildings in Beverly Hills routinely show two to four inches of differential settlement. We assess this during the initial site visit, price the remediation in the written quote, and obtain approval before touching the structure.
- Chapter 7A fire requirements on hillside parcels. North of Sunset Boulevard, CAL FIRE’s Very High Fire Hazard Severity Zones trigger ember-resistant vents, ignition-resistant framing, and specific siding assemblies that flat Flats lots never face. We map this requirement before design begins so it appears in your price, not as a mid-project surprise.
Pricing for New Detached ADU in Beverly Hills, CA
A typical new detached ADU in Beverly Hills runs $195,000-$485,000 all-in, with the final figure determined by four factors we assess before giving you a written price: the construction type (custom, prefab, or modular), the exterior finish specification required by architectural compatibility review, foundation and utility conditions on your specific lot, and whether your parcel falls within a Very High Fire Hazard Severity Zone triggering Chapter 7A upgrades.
Custom built ADUs with period-matched exteriors typically land at $285,000-$485,000. Prefab and modular installations, where the manufacturer’s system can be adapted to local requirements, usually range from $195,000 to $340,000. Studio units at the smaller end of the spectrum; 2-bed units with full kitchens at the larger.
Every project is quoted with a written price before any work begins, per Haven Standard Clause 1. No call-for-pricing, no ballpark that balloons. We also offer a Free Second Opinion on any written estimate you already have in hand.
| ADU Type | Typical Range in Beverly Hills |
|---|---|
| Studio ADU (custom) | $195,000 - $325,000 |
| 1-Bed ADU (custom) | $240,000 - $380,000 |
| 2-Bed ADU (custom) | $320,000 - $485,000 |
| Prefab ADU (installed) | $195,000 - $310,000 |
| Modular ADU (installed) | $220,000 - $340,000 |
Call (424) 325-4322 to schedule your free estimate.
We Also Serve Cities Near Beverly Hills
Our crews work throughout the metro core, including Beverly Hills, West Hollywood, Studio City, Sherman Oaks, and North Hollywood. Each city’s building department has its own permit sequence and plan-check personality, and we adjust our documentation and scheduling accordingly. If you’re comparing options across neighborhoods, our New Detached ADU hub page outlines our full design-build process, or call (424) 325-4322 and we’ll route you to the right specialist for your specific jurisdiction.
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
Beverly Hills enforces architectural compatibility review through its Planning Division, which treats ADUs as visible elements of the historic streetscape rather than purely functional additions. The city updated its ADU ordinance only around 2020 under state pressure, and it used that process to preserve local design standards that LA City and other neighboring jurisdictions do not apply. For your project, this means specifying authentic clay tile, hand-applied stucco, or period-appropriate trim in the original permit set, not substituting composite materials that trigger resubmittal. We handle this specification in our design phase and lock the material costs into your written price before construction starts. Call (424) 325-4322 to review how this applies to your specific property.
Beverly Hills’s independent building department at 455 North Rexford Drive will require full electrical and plumbing upgrades to current code before signing off on any ADU conversion. On a 1938 Spanish Colonial estate near Carmelita Avenue, our crew found a 60-amp sub-panel with cloth-insulated wiring, galvanized supply lines, and a foundation that had settled two inches at the rear corner. We wrote allowances for the panel upgrade, copper re-pipe, and foundation piers into the contract before demo, then priced the unexpected dry-rot framing repair in writing and got approval before touching it. The key is inspecting before quoting, and quoting everything in writing. Call (424) 325-4322 to schedule that inspection.
Yes. Hillside parcels north of Sunset Boulevard fall largely within CAL FIRE’s Very High Fire Hazard Severity Zones, which triggers Chapter 7A of the California Building Code on all new detached construction. This requires ember-resistant vents, ignition-resistant framing and siding assemblies, and specific roof edge details that flat Flats lots do not face. These requirements add measurable material and labor cost, typically $15,000-$35,000 depending on ADU size and roof complexity. We map your parcel against CAL FIRE data during our initial site visit so this cost appears in your written price, not as a mid-project change order. Call (424) 325-4322 to confirm your parcel’s fire zone status.
Beverly Hills maintained some of California’s most restrictive ADU ordinances and resisted state mandate compliance longer than nearly any neighboring city, only updating its rules around 2020 under direct state pressure. This delay means a large share of homeowners on oversized Flats estate lots are only now realizing they have actionable ADU rights under state law, even where local zoning once seemed to prohibit them. If your lot exceeds 6,000 square feet and you have adequate setbacks, you likely have a buildable ADU entitlement that was effectively unavailable five years ago. We verify this entitlement through a preliminary title and zoning review before design begins, at no cost during the estimate phase. Call (424) 325-4322 to check your lot.
The single biggest reason a quote moves is concealed conditions in older detached structures, especially on estates built 1920s-1950s in The Flats. Outdated wiring, undersized or damaged framing, failed waterproofing, and code upgrades triggered once walls are open can shift project cost if they weren’t inspected and allowance-priced upfront. We handle this by conducting a full structural and MEP inspection before contract signing, writing specific allowances into the Haven Standard contract, and pricing any surprise in writing with your approval before we touch it. Under Clause 5 (No Surprises), the scope is locked at signing; no door-side upsells, no scope creep. Call (424) 325-4322 to schedule your inspection and written estimate.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving Beverly Hills since 2015.