ADU in Beverly Hills, CA
A Junior ADU or interior conversion in Beverly Hills typically runs $85,000-$180,000 all-in, while site prep and utility work for hillside parcels north of Sunset often adds $35,000-$75,000 before construction begins. We handle both under one contract with a written price locked before work starts. Call (424) 325-4322 to schedule your free estimate.
Most Beverly Hills homeowners who reach us are sitting on properties in The Flats with 1920s-1950s housing stock they never realized could yield rental income or multigenerational space. The city’s delayed compliance with state ADU mandates means many estate lots have only recently become actionable, and the architectural compatibility requirements here are stricter than in neighboring LA City. We coordinate Junior ADU & Interior Conversion and ADU Site Prep & Utilities from our Los Angeles office, with crews serving Beverly Hills locally.
Why Beverly Hills Homes Are Different
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 state pressure. That means a large share of homeowners on oversized Flats estate lots are only now realizing they have actionable ADU rights.
Unlike neighboring LA City, Beverly Hills still imposes meaningful architectural compatibility review. New ADU construction must match the period materials and character of the primary residence, which fundamentally changes the cost and contractor profile of every project. The Planning Division has flagged submittals where exterior finishes don’t match the primary home’s era, requiring authentic clay tile roofing and hand-applied stucco on 1930s Spanish Colonial conversions rather than composite substitutes.
Hillside parcels north of Sunset fall largely within Very High Fire Hazard Severity Zones under CAL FIRE mapping, triggering Chapter 7A fire-resistive construction requirements that flat Flats lots do not face. Older detached structures throughout the city routinely carry undersized electrical sub-panels, galvanized or cast-iron plumbing, and foundation conditions requiring significant remediation before Beverly Hills’ independent building department will sign off.
Our Main Beverly Hills Services
These are the three services Beverly Hills homeowners call about most, each with its own dedicated page and pricing.
ADU Design & Permitting in Beverly Hills
Our permit set is the core product, not an afterthought. In Beverly Hills, this means navigating architectural compatibility review from day one, with drawings that specify period-appropriate materials to avoid costly resubmittals. We model fire-resistive requirements for hillside parcels and document every condition in the submittal package. ADU Design & Permitting in Beverly Hills covers the full design-build contract from measured drawings through certificate of occupancy.
Garage Conversion ADU in Beverly Hills
Detached carriage garages in The Flats are prime conversion candidates under state law, but most need electrical, plumbing, and foundation remediation before the city will approve. We assess the existing slab, structural capacity, and utility routing in the initial site visit, with all findings documented in the written scope. Garage Conversion ADU in Beverly Hills includes the full conversion under our single contract.
New Detached ADU in Beverly Hills
New detached units face the strictest compatibility review in Beverly Hills, with inspectors scrutinizing roof pitch, window proportions, and exterior finishes against the primary residence. We specify prefab systems from Abodu, Cover, or Dvele when the design allows, coordinated within the same single contract. New Detached ADU in Beverly Hills covers ground-up construction with permits pulled and inspections passed.
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
A Junior ADU or interior conversion in Beverly Hills transforms existing square footage within the primary residence or an attached structure, avoiding the compatibility review burden of new exterior construction while still requiring careful code analysis for these 1920s-1950s buildings. Most Flats estates have underutilized basements, carriage-house levels, or large attached wings that were never designed for independent living, with aging electrical and plumbing that must be brought to current code. We handle Junior ADU & Interior Conversion as a single contract with drawings, permits, and build at one written price.
Basement ADU
Signs you need it
Your basement has 7.5+ feet of clear headroom, existing exterior access or window wells that meet egress code, and you’re currently using it for storage on a property where above-ground footprint is restricted by setback or compatibility concerns.
What it costs in Beverly Hills
Basement ADU conversions in Beverly Hills typically run $95,000-$165,000 all-in, with foundation moisture remediation and sewer ejector systems adding $8,000-$18,000 on properties where the main sewer lateral sits above the basement floor level.
How we do it
We test for moisture intrusion, design the egress window or door placement, specify the ejector or grinder pump system, run new electrical and plumbing from the main panel and stack, and submit the permit set with structural verification of the existing slab and bearing walls.
Room-to-ADU Conversion
Signs you need it
You have a ground-floor wing, former staff quarters, or oversized attached room with separate exterior access and its own bathroom rough-in that could become a self-contained unit without altering the home’s roofline or exterior envelope.
What it costs in Beverly Hills
Room-to-ADU conversions in Beverly Hills typically run $85,000-$140,000 all-in, with the lower end applying when plumbing and electrical capacity are already proximate and the higher end reflecting seismic retrofit of older balloon framing or lath-and-plaster fire separation.
How we do it
We verify fire separation between units, design the kitchenette layout for code-compliant clearances, extend or upgrade the electrical sub-panel, install separate metering if required, and document every existing condition with photos before demolition begins.
What Junior ADU & Interior Conversion Costs in Beverly Hills
| Item | Typical range in Beverly Hills |
|---|---|
| Basement ADU conversion | $95,000 - $165,000 |
| Room-to-ADU conversion | $85,000 - $140,000 |
| Above-garage ADU conversion | $110,000 - $195,000 |
Does a Junior ADU need its own kitchen and bathroom in Beverly Hills?
Yes, a Junior ADU requires a kitchenette with cooking facilities and either its own bathroom or an approved shared bathroom arrangement with specific code-compliant access. In Beverly Hills, the Planning Division also reviews whether the conversion’s exterior access door preserves the primary residence’s architectural character.
Will interior conversion trigger the same compatibility review as new construction?
No, interior conversions and Junior ADUs typically avoid exterior architectural compatibility review since they don’t alter the primary residence’s visible envelope, though any new exterior door or window must still meet design guidelines. Call (424) 325-4322 for an exact quote on your specific floor plan - estimates are free.
ADU Site Prep & Utilities in Beverly Hills
ADU site prep and utility work in Beverly Hills addresses the hidden conditions that stop projects cold: hillside grading requirements, 1920s-era galvanized plumbing, and electrical panels never designed for additional dwelling unit loads. Hillside parcels north of Sunset face Chapter 7A fire-resistive construction mandates that flat Flats lots avoid, while older estates throughout the city often need complete utility infrastructure before the building department will approve the ADU permit. We coordinate ADU Site Prep & Utilities within the same single contract, with the written price locked before any excavation begins.
Foundation & Grading
Signs you need it
Your existing detached garage or carriage house sits on a cracked, un-reinforced slab, or your hillside lot shows visible soil movement, drainage pooling, or retaining wall distress that Beverly Hills’ geotechnical review will flag before foundation approval.
What it costs in Beverly Hills
Foundation and grading work in Beverly Hills typically runs $25,000-$65,000 for flat Flats lots and $45,000-$95,000 for hillside parcels requiring retaining walls, soil export, or engineered fill to achieve buildable pad geometry.
How we do it
We engage a soils engineer for the geotechnical report, design the retaining wall or grade beam system, coordinate the export/import balance with the city’s haul route requirements, and pour the new foundation with hold-downs and anchor bolts specified for the ADU’s structural system.
Electrical Panel Upgrade
Signs you need it
Your main service panel is rated below 200 amps, still uses fuses or a split-bus configuration, or lacks physical space for the additional breakers an ADU requires for kitchen, HVAC, and laundry circuits.
What it costs in Beverly Hills
Electrical panel upgrades in Beverly Hills typically run $8,000-$18,000 for a 200-amp service replacement with trenching to the existing meter, and $15,000-$28,000 when the utility requires a new underground service lateral from the street transformer.
How we do it
We verify the existing load calculation, submit the service upgrade request to LADWP or SCE depending on your grid zone, pull the permit for the panel and any new lateral, and coordinate the utility’s disconnect-reconnect window with our rough electrical inspection.
What ADU Site Prep & Utilities Costs in Beverly Hills
| Item | Typical range in Beverly Hills |
|---|---|
| Foundation & grading | $25,000 - $95,000 |
| Electrical panel upgrade | $8,000 - $28,000 |
| Plumbing lateral replacement | $12,000 - $35,000 |
Does Beverly Hills require separate utility meters for an ADU?
Separate metering is not mandated by state law but may be required by your specific utility provider or chosen financing structure; Beverly Hills Building & Safety reviews the electrical and plumbing plans for capacity regardless of metering configuration. We design for either scenario and specify the appropriate sub-panel or meter socket in the permit set.
How long does site prep take before construction can start?
Utility coordination and foundation work typically add 4-8 weeks before the ADU structure can be erected, with hillside grading and retaining wall curing extending this timeline. Call (424) 325-4322 for a schedule specific to your parcel - estimates are free.
Brands We Service in Beverly Hills
We specify and coordinate prefab and modular systems from Abodu, Cover, and Dvele within our single-contract model, with parts and warranty support stocked locally through our Los Angeles coordination office. Most prefab installations in Beverly Hills require 6-10 weeks from factory order to crane-set, with our permit set submitted in parallel. See our brands for full specifications.
Pricing for ADU in Beverly Hills, CA
| Service | Typical range in Beverly Hills |
|---|---|
| Basement ADU conversion | $95,000 - $165,000 |
| Room-to-ADU conversion | $85,000 - $140,000 |
| Above-garage ADU conversion | $110,000 - $195,000 |
| Foundation & grading (Flats) | $25,000 - $65,000 |
| Foundation & grading (hillside) | $45,000 - $95,000 |
| Electrical panel upgrade | $8,000 - $28,000 |
| Plumbing lateral replacement | $12,000 - $35,000 |
| Full design-build with permits | Written price before work starts |
Prices push higher in Beverly Hills primarily due to architectural compatibility requirements specifying period materials, hillside fire-resistive construction mandates, and the independent building department’s rigorous plan-check process that rewards thorough initial submittals. Under Haven Standard Clause 1, every project receives a written price before any work begins - no exceptions, no change orders once the scope is locked at signing.
Neighborhoods We Serve in Beverly Hills
We work across Beverly Hills’ distinct residential zones, from the large-lot estates of The Flats to the hillside properties north of Sunset. Dispatch and scheduling are coordinated from our Los Angeles office, with crews typically on-site within one business day of permit approval.
- The Flats (South of Sunset)
- Trousdale Estates
- Beverly Hills Post Office
- Beverly Crest
- Golden Triangle
Service Area - Cities Near Beverly Hills
Our crews serve the full Westside and San Fernando Valley corridor, with active projects in West Hollywood, CA, Studio City, CA, Sherman Oaks, CA, and North Hollywood, CA. Each city carries its own ADU ordinance interpretation and permit timeline, which we factor into every written quote.
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 maintains stricter architectural compatibility review and was slower to adopt state-compliant ADU rules, meaning some estate lots only became actionable around 2020. The city still requires new ADU exteriors to match the primary residence’s period character, a standard LA City does not enforce.
State law limits HOA prohibition of ADUs, but Beverly Hills’ design review and specific plan conditions can impose requirements that functionally constrain size, placement, or exterior appearance on covenant-controlled properties. We review your CC&Rs and the city’s specific plan in the initial feasibility study.
Beverly Hills’ independent Building & Safety Department typically takes 8-14 weeks for plan check on ADU submittals, with timelines extending if architectural compatibility or hillside fire requirements trigger additional review cycles. A complete, code-compliant permit set submitted initially avoids the resubmittal delays that add months.
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
"Every allowance was itemised at the start, so the finish selections did not turn into a surprise at the end."
- Benedict H."The rental income has covered the payment since the second month. They were realistic about the numbers rather than optimistic."
- Odette N."They walked us through setbacks and utility capacity before we paid anything, and told us one of our two options was not going to get approved."
- Mireille T.