ADU in Beverly Hills, CA
A Junior ADU or interior conversion in Beverly Hills typically runs $85,000-$165,000 all-in, drawings through final inspection, while site prep and utilities for hillside parcels north of Sunset can add $35,000-$80,000 before construction begins. Beverly Hills operates its own Building and Safety Department entirely separate from LADBS, with its own plan checkers, fire department sign-off, and architectural compatibility standards that make the permit timeline longer and more expensive than equivalent projects across the city line in West Hollywood. The 1920s-1950s housing stock south of Sunset features detached garages accessed via rear alleys, prime for conversion, but their age means undersized electrical panels, unretrofitted foundations, and plumbing requiring full replacement. Call (424) 407-8266 to schedule your free estimate.
Why Beverly Hills Homes Are Different
Beverly Hills is an independent municipality with its own Building and Safety Department, and it has historically been among California’s most resistant cities to ADU expansion. Every permit runs through Beverly Hills’s own plan checkers, its own fire department sign-off, and its own design standards. A homeowner whose lot straddles the Beverly Hills/Los Angeles boundary faces a materially different, typically slower and costlier, approval process on the Beverly Hills side.
The residential flats south of Sunset hold 1920s-1950s Spanish Colonial Revival, Tudor, and traditional single-family homes on generous lots with detached garages accessed via rear alleys. Those garages are the primary ADU conversion target, but their age typically means undersized electrical panels, no seismic retrofitting on the garage foundation, and plumbing requiring full replacement before occupancy. North of Sunset, hillside estates sit on steep, geologically complex terrain that requires extensive grading, retaining walls, and soils reports, substantially raising the cost baseline for any detached ADU.
Hillside parcels north of Sunset fall within Very High Fire Hazard Severity Zones, requiring ignition-resistant framing assemblies, Class A roofing, and ember-resistant vent standards under California’s WUI code. Requirements that simply do not apply to ADU projects on the flat grid streets a half-mile south. The city-wide alley grid through the flats gives nearly every garage-conversion ADU a built-in separate vehicular entrance from the rear lane, eliminating the driveway-impact parking replacement problem common in LA proper. But Beverly Hills’s plan checkers have historically scrutinized alley-facing ADU facades for material and massing compatibility with the primary home at a level of detail that LADBS does not apply to equivalent conversions just across the city line in West Hollywood.
Our Main Beverly Hills Services
Most Beverly Hills homeowners start with one of these three services, each with its own dedicated page and pricing.
ADU Design & Permitting in Beverly Hills
We produce the full permit set, structural calculations, and Title 24 energy compliance as a single deliverable, then shepherd it through Beverly Hills’s independent plan check. The city’s architectural compatibility review adds a layer of scrutiny that LADBS does not apply, so our drawings anticipate facade material, massing, and roofline questions before the first submittal. ADU Design & Permitting in Beverly Hills covers the complete process from as-built survey through certificate of occupancy.
Garage Conversion ADU in Beverly Hills
The alley-accessed detached garages south of Sunset are ideal conversion candidates, but most need electrical service upgrades, foundation retrofitting, and complete plumbing replacement before they meet code for habitation. We handle the structural analysis, MEP design, and permit navigation as one contract. Garage Conversion ADU in Beverly Hills details the full scope and pricing.
New Detached ADU in Beverly Hills
North of Sunset, hillside terrain triggers geotechnical reports, retaining walls, and WUI fire-resistant construction that flatland projects avoid. We coordinate soils engineers, grading contractors, and the Beverly Hills Fire Department’s ignition-resistant assembly review under our single contract. New Detached ADU in Beverly Hills explains the hillside-specific process and cost structure.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Junior ADU & Interior Conversion in Beverly Hills
Junior ADU & Interior Conversion in Beverly Hills creates rental units within the existing footprint, ideal for homeowners who cannot expand their building envelope due to hillside setbacks, WUI fire zones, or the city’s strict architectural compatibility review. The 1920s-1950s housing stock south of Sunset offers basements, above-garage spaces, and underutilized interior rooms that convert efficiently, though aging systems require careful MEP planning. Junior ADU & Interior Conversion covers our full service beyond Beverly Hills.
Basement ADU
Signs you need it
You have a walk-out or daylight basement with 7.5-foot minimum ceiling height, separate exterior access, and a 1920s-1950s foundation that needs moisture mitigation and seismic anchoring before occupancy.
What it costs in Beverly Hills
Basement ADU conversions in Beverly Hills typically run $95,000-$175,000 all-in, including egress window installation, moisture barrier systems, and MEP rough-in to serve a kitchen and bath.
How we do it
We produce as-built drawings, design the egress and ventilation plan for Beverly Hills plan check, then execute excavation, waterproofing, framing, and finish under our single contract with documented photo records at each phase.
Room-to-ADU Conversion
Signs you need it
You have a 400-800 square foot ground-floor room with direct exterior access, separate from the main living area, and your electrical panel has capacity for a small kitchen and bath addition.
What it costs in Beverly Hills
Room-to-ADU conversions in Beverly Hills typically run $75,000-$140,000 all-in, including kitchenette and three-quarter bath rough-in, permit set, and Beverly Hills plan check fees.
How we do it
We verify panel capacity and plumbing lateral access, design the kitchen and bath layout for code compliance, submit to Beverly Hills Building and Safety, then build with zero change orders under Haven Standard Clause 1.
What Junior ADU & Interior Conversion Costs in Beverly Hills
| Item | Typical range in Beverly Hills |
|---|---|
| Basement ADU conversion | $95,000 - $175,000 |
| Room-to-ADU conversion | $75,000 - $140,000 |
| Above-garage ADU (structure only) | $85,000 - $155,000 |
Can a Junior ADU have its own kitchen in Beverly Hills?
Yes, California state law permits a full kitchen in a Junior ADU, and Beverly Hills must comply despite its historical resistance to ADU expansion. We design the kitchen layout to meet Health Department clearances and Beverly Hills’s architectural compatibility standards for visible exterior elements.
How long does interior ADU permitting take in Beverly Hills?
Interior conversions typically require 4-7 months for Beverly Hills plan check and approval, longer than LADBS due to the city’s independent review and architectural compatibility scrutiny. Call (424) 407-8266 for a timeline based on your specific project.
ADU Site Prep & Utilities in Beverly Hills
ADU Site Prep & Utilities in Beverly Hills addresses the pre-construction conditions that derail most projects: hillside grading, electrical service inadequate for a second dwelling, and plumbing laterals from the 1920s-1950s that cannot handle additional fixtures. North of Sunset, WUI fire zones and geotechnical complexity make this phase especially critical, while south of Sunset, aging infrastructure in the flats requires systematic replacement. ADU Site Prep & Utilities details our full capabilities.
Foundation & Grading
Signs you need it
Your garage slab is 4 inches thick without rebar, your hillside lot shows soil creep or previous retaining wall failure, or Beverly Hills requires a geotechnical report for any new foundation.
What it costs in Beverly Hills
Foundation and grading work in Beverly Hills typically runs $25,000-$65,000 for hillside parcels, $12,000-$28,000 for flatland garage slabs including seismic retrofit.
How we do it
We engage a soils engineer, produce the grading plan for Beverly Hills review, pour to engineered specifications, and document every pour with dated photos under our Haven Standard photo record requirement.
Electrical Panel Upgrade
Signs you need it
Your main panel is 100 amps or less, has no space for a subpanel, or contains fused disconnects that Beverly Hills will not approve for a second dwelling unit.
What it costs in Beverly Hills
Electrical panel upgrades in Beverly Hills typically run $4,500-$12,000 for 200-amp service with underground conduit, plus SCE coordination fees that vary by transformer capacity.
How we do it
We calculate the ADU load, specify the new panel and conduit route, pull the permit through Beverly Hills, coordinate with SCE for service release, and pass inspection before rough-in begins.
What ADU Site Prep & Utilities Costs in Beverly Hills
| Item | Typical range in Beverly Hills |
|---|---|
| Foundation & grading (hillside) | $25,000 - $65,000 |
| Electrical panel upgrade | $4,500 - $12,000 |
| Plumbing lateral replacement | $8,000 - $22,000 |
Does Beverly Hills require a separate utility meter for an ADU?
Not for Junior ADUs, but detached and some attached ADUs require separate electric meters; Beverly Hills defers to SCE for final meter determination. We coordinate the SCE application as part of our single-contract scope.
Can site prep begin before ADU permits are approved?
No, Beverly Hills prohibits early grading or utility work that requires a building permit; however, geotechnical investigation and survey can proceed in parallel with design. Call (424) 407-8266 to schedule your free estimate and we will map the critical path.
Brands We Service in Beverly Hills
We specify and coordinate prefab and modular systems from Abodu, Cover, and Dvele within our single-contract design-build model, integrating their factory-built modules with Beverly Hills’s site-specific foundation, utility, and WUI fire-resistant requirements. Our brands page lists all manufacturers we support.
Pricing for ADU in Beverly Hills, CA
| Service | Typical range in Beverly Hills |
|---|---|
| Junior ADU & Interior Conversion | $75,000 - $175,000 |
| Basement ADU conversion | $95,000 - $175,000 |
| Room-to-ADU conversion | $75,000 - $140,000 |
| Above-garage ADU | $85,000 - $155,000 |
| ADU Site Prep & Utilities | $12,000 - $65,000 |
| Foundation & grading (hillside) | $25,000 - $65,000 |
| Foundation & grading (flatland) | $12,000 - $28,000 |
| Electrical panel upgrade | $4,500 - $12,000 |
| Plumbing lateral replacement | $8,000 - $22,000 |
Prices push higher in Beverly Hills due to the city’s independent plan check fees, hillside geotechnical requirements, WUI fire-resistant materials, and the extended timeline for architectural compatibility review. Every project is quoted with a written price before any work begins, per Haven Standard Clause 1; no change orders, no door-side upsells.
Neighborhoods We Serve in Beverly Hills
We work across Beverly Hills’s distinct zones, from the flatland residential neighborhoods south of Sunset with their alley-accessed garages to the hillside estates north of Sunset requiring extensive grading and WUI compliance. Scheduling and dispatch are coordinated from our Los Angeles office; crews serve Beverly Hills locally with typical response within one business day for site visits.
- The Flats (south of Sunset)
- Trousdale Estates
- Beverly Hills Post Office
- Beverly Park
- Golden Triangle
Service Area - Cities Near Beverly Hills
We serve homeowners throughout the central Los Angeles metro, including adjacent jurisdictions with their own ADU rules and permit timelines. Nearby cities include West Hollywood, CA, with LADBS permitting and faster plan check; Studio City, CA, in the San Fernando Valley with hillside terrain similar to north Beverly Hills; Culver City, CA, with its own independent building department; and Sherman Oaks, CA, another LADBS jurisdiction popular for garage conversions.
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 About ADU in Beverly Hills
Beverly Hills operates its own Building and Safety Department with independent plan checkers, fire department sign-off, and architectural compatibility standards that LADBS does not enforce. Projects typically take longer and cost more in fees than equivalent work across the city line.
Yes, but north of Sunset parcels fall within Very High Fire Hazard Severity Zones, requiring WUI-compliant ignition-resistant framing, Class A roofing, and ember-resistant vents that add material cost and design complexity.
No. Under Haven Standard Clause 1, the written price is locked at contract signing. Scope changes initiated by the client are documented in writing with cost before execution. Call (424) 407-8266 for your free, written estimate.
What happens when you call
- 1A real person answersNo phone trees - talk to a local adu pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Beverly Hills Customers Say
"The permit set and the build were one contract with one number. Our neighbours used two firms and spent a year watching them blame each other."
- Helena V."Every allowance was itemised at the start, so the finish selections did not turn into a surprise at the end."
- Benedict H."Garage conversion finished on the drawings and close to the schedule. They were honest that the sewer connection was the unknown, and it was."
- Arjun D.