ADU in Beverly Hills, CA
Junior ADU & Interior Conversion in Beverly Hills typically runs $95,000-$175,000 all-in, drawings through final inspection, while ADU Site Prep & Utilities adds $25,000-$85,000 depending on hillside conditions and utility capacity. We’re Ellery ADU Studio, a design-build practice founded in 2015, and our Los Angeles office coordinates crews who serve Beverly Hills under a single contract at one written price. Call (424) 551-7706 to schedule your free estimate.
Most Beverly Hills homeowners who contact us are sitting on 1920s-1950s housing stock south of Sunset - Spanish Colonial Revival, Tudor, or Mediterranean estates with large R-1 lots, original detached garages, and sometimes unpermitted prior work that has to be resolved before any ADU permit issues. Others own hillside properties north of Sunset where decomposed-granite soils and Very High Fire Hazard Severity Zone requirements change every cost assumption. Either way, you’re not in Los Angeles anymore: Beverly Hills Building & Safety operates independently, and the permissive LADBS fast-track framework stops at the city limit.
Why Beverly Hills Homes Are Different
Beverly Hills is its own municipality with its own Building & Safety division at City Hall on Santa Monica Boulevard. The staff, plan checkers, and inspectors follow Beverly Hills Municipal Code timelines, not LADBS. The owner-builder exemptions and expedited pathways that contractors know from LA City do not transfer across the border, even on blocks that sit one street away from West Hollywood or Culver City.
The housing stock reinforces this divide. The flats south of Sunset hold dense concentrations of pre-1950s estates on generous lots, many with original multi-car garages or early guesthouses that look like obvious ADU candidates until you discover non-conforming setbacks, unpermitted additions, or utility mains sized for a single household. North of Sunset, Benedict Canyon, Coldwater Canyon, and Trousdale-adjacent parcels sit on slopes with decomposed-granite soils that trigger geotechnical review for any new foundation. These same hillside areas fall within Very High Fire Hazard Severity Zones, so Chapter 7A standards apply: ignition-resistant siding, ember-resistant venting, tempered glazing. Neighboring West Hollywood or Culver City flat lots rarely trigger the same requirements.
Historically, Beverly Hills resisted densification and adopted ADU compliance only under state mandate pressure. That conservative posture still shows up in design-compatibility expectations, setback interpretations, and the overall pace of review. A permit set that sails through LA City can face additional scrutiny here for aesthetic continuity with existing streetscape character.
Our Main Beverly Hills Services
These are the three services Beverly Hills homeowners ask about most, each with its own dedicated page and pricing detail.
ADU Design & Permitting in Beverly Hills
We produce the full permit set - architectural drawings, structural calculations, Title 24 energy compliance, and Beverly Hills-specific site plans - as the core product, not an afterthought. Every set is prepared for submittal to Beverly Hills Building & Safety, not LADBS, with local setback and fire-resistive interpretations built in from the first draft. ADU Design & Permitting in Beverly Hills covers the complete design-build contract.
Garage Conversion ADU in Beverly Hills
Garage conversions in Beverly Hills often start with a 1920s-1950s detached structure on a slab that may be 4 inches thick, within range for conversion, or may need augmentation. We verify existing conditions with a documented photo record, resolve any unpermitted prior work with the city, and quote a single written price for drawings through final inspection. Garage Conversion ADU in Beverly Hills details the full scope.
New Detached ADU in Beverly Hills
New detached units on Beverly Hills R-1 lots face fire-hazard zone requirements on hillside parcels and design-compatibility review on all parcels. We coordinate geotechnical referral where slopes or cut-and-fill grading exists, and we specify prefab systems from brands including Cover or Dvele when the site conditions suit modular delivery. New Detached ADU in Beverly Hills explains the single-contract process.
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 solves a specific problem: you already have enclosed square footage - a basement, a room, an attached garage, or space above a garage - and you need it permitted as independent living quarters without adding new exterior footprint. In a city where hillside lots resist new construction and flat-lot estates often carry unpermitted square footage from prior decades, this path lets you build within what you own. We handle the full Junior ADU & Interior Conversion under the same single contract, with one written price before work starts.
Room-to-ADU Conversion
Signs you need it
You have a ground-floor bedroom wing, former staff quarters, or enclosed sun porch with separate exterior access that could become a self-contained unit if kitchen and bath plumbing are added.
What it costs in Beverly Hills
Room-to-ADU conversion typically runs $85,000-$155,000 all-in, including permit set, mechanical rough-in, and finish work to Beverly Hills Building & Safety standards.
How we do it
We survey existing structure, design the kitchen and bath layout for code minimum ceiling heights and egress windows, produce the full permit set, and build through final inspection with documented photo records at each visit.
Interior JADU
Signs you need it
You live in a single-family home and want to convert an existing bedroom or attached living space into a Junior ADU with efficiency kitchen and separate entrance, sharing utilities with the main house.
What it costs in Beverly Hills
Interior JADU typically runs $75,000-$135,000 all-in, including the permit set, utility tie-ins, fire separation, and finish to Beverly Hills interior standards.
How we do it
We verify the main residence remains owner-occupied per state law, design fire separation and sound attenuation between units, run the permit set through Beverly Hills plan check, and build to final with no change orders.
What Junior ADU & Interior Conversion Costs in Beverly Hills
| Item | Typical range in Beverly Hills |
|---|---|
| Room-to-ADU Conversion | $85,000 - $155,000 |
| Interior JADU | $75,000 - $135,000 |
| Above-Garage ADU (structural upgrade included) | $110,000 - $195,000 |
Can a Junior ADU share utilities with the main house?
Yes, state law allows Junior ADUs to share electrical, gas, and water services with the primary residence, though Beverly Hills Building & Safety requires separate metering or sub-metering documentation in the permit set. Call (424) 551-7706 for an exact quote - estimates are free.
Does unpermitted prior work block a Junior ADU permit?
Often it does until resolved; Beverly Hills requires existing conditions to be brought into compliance before new permits issue, which we handle as a scoped line item with a written price before work starts. Call (424) 551-7706 for an exact quote - estimates are free.
ADU Site Prep & Utilities in Beverly Hills
ADU Site Prep & Utilities in Beverly Hills addresses the conditions that stop projects before design begins: a 100-amp electrical panel that cannot support a second dwelling, a sewer lateral at capacity on a 1920s flat, or a hillside lot where decomposed-granite soils require geotechnical referral and specialized foundation design. We handle these as scoped, written-price phases under the same ADU Site Prep & Utilities contract, so the work that happens before walls go up is documented, permitted, and inspection-passed.
Foundation & Grading
Signs you need it
Your hillside lot in Benedict Canyon or Trousdale shows slope creep, your garage slab is cracked and uneven, or Beverly Hills Building & Safety has flagged geotechnical review for any new foundation.
What it costs in Beverly Hills
Foundation and grading work typically runs $35,000-$85,000, including soils report, engineered fill if needed, and inspection-ready documentation.
How we do it
We engage a licensed geotechnical engineer, produce the soils report for Beverly Hills plan check, execute cut-and-fill or pier foundation as specified, and pass inspection before framing begins.
Electrical Panel Upgrade
Signs you need it
Your main panel is 100 amps or dated to the 1960s, your ADU design includes electric heat or vehicle charging, or the existing service cannot carry the additional load per Title 24.
What it costs in Beverly Hills
Electrical panel upgrade with service trenching typically runs $8,500-$18,000, including LADWP coordination, permit, and inspection.
How we do it
We size the new panel to ADU plus main house load, coordinate with LADWP for service upgrade, pull Beverly Hills electrical permit, and install with documented photo record at each stage.
What ADU Site Prep & Utilities Costs in Beverly Hills
| Item | Typical range in Beverly Hills |
|---|---|
| Foundation & Grading | $35,000 - $85,000 |
| Electrical Panel Upgrade | $8,500 - $18,000 |
| Plumbing Lateral Replacement | $12,000 - $28,000 |
Is geotechnical review required for all hillside ADUs?
Not all, but Beverly Hills Building & Safety triggers geotechnical review for most new foundations on slopes over 15 percent or in designated hillside areas; we identify this requirement in our initial site survey and include it as a written line item. Call (424) 551-7706 for an exact quote - estimates are free.
Can Site Prep be contracted separately from the ADU build?
Yes, though most clients prefer the single-contract design-build model so that foundation, utility, and construction phases share one timeline, one warranty, and no blame gap if conditions change. Call (424) 551-7706 for an exact quote - estimates are free.
Brands We Service in Beverly Hills
We specify and coordinate prefab and modular systems from Cover, Dvele, Mighty Buildings, and Boxabl within the same single contract, handling factory-to-site logistics, crane placement, and Beverly Hills inspection scheduling. Parts and technical documentation are stocked locally through our Los Angeles coordination office. Our brands page lists full specifications.
Pricing for ADU in Beverly Hills, CA
| Service | Typical range in Beverly Hills |
|---|---|
| Junior ADU & Interior Conversion - Interior JADU | $75,000 - $135,000 |
| Junior ADU & Interior Conversion - Room-to-ADU | $85,000 - $155,000 |
| Junior ADU & Interior Conversion - Above-Garage ADU | $110,000 - $195,000 |
| ADU Site Prep & Utilities - Foundation & Grading | $35,000 - $85,000 |
| ADU Site Prep & Utilities - Electrical Panel Upgrade | $8,500 - $18,000 |
| ADU Site Prep & Utilities - Plumbing Lateral | $12,000 - $28,000 |
| ADU Site Prep & Utilities - Gas Line Extension | $4,500 - $12,000 |
| ADU Site Prep & Utilities - Landscaping & Hardscape | $8,000 - $25,000 |
Prices push higher in Beverly Hills for hillside geotechnical work, Chapter 7A fire-resistive materials in Very High Fire Hazard Severity Zones, and resolution of unpermitted prior work before permit issuance. Under Haven Standard Clause 1, every project carries a written price before any work begins - no call-for-pricing, no door-side upsells.
Neighborhoods We Serve in Beverly Hills
We work across Beverly Hills flats and hillside areas, from the estate lots south of Sunset to the canyon properties north. Dispatch and scheduling are coordinated from our Los Angeles office; crews arrive with materials and permit documentation ready for the local jurisdiction.
- The Flats (south of Sunset)
- Benedict Canyon
- Coldwater Canyon
- Trousdale Estates
- Beverly Hills Post Office
Service Area - Cities Near Beverly Hills
Our crews serve the full Beverly Hills area and adjacent municipalities where similar design-build conditions apply. Homeowners in West Hollywood, CA, Studio City, CA, Culver City, CA, and Sherman Oaks, CA contact us for ADU work under the same single-contract, written-price model, with permit sets prepared for each city’s specific Building & Safety division.
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
Plan check typically runs 8-12 weeks for a complete submittal, longer if corrections are required; Beverly Hills does not participate in the LADBS fast-track program, so timelines reflect independent municipal staffing. We track every submittal and respond to corrections within 48 hours to keep the queue moving.
State law limits HOA prohibition of ADUs, but design guidelines, color palettes, and setback covenants in older Beverly Hills associations can still shape what gets built; we review CC&Rs during initial site survey and flag any conflict before permit submittal.
Yes, and Beverly Hills Building & Safety often expects it; we specify stucco profiles, tile roofs, and fenestration patterns that satisfy design-compatibility review while meeting current energy and structural code.
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
"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."Every allowance was itemised at the start, so the finish selections did not turn into a surprise at the end."
- Benedict H."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.