ADU in Beverly Hills, CA
Junior ADU & Interior Conversion in Beverly Hills typically runs $85,000-$180,000 all-in, drawings through final inspection, while ADU Site Prep & Utilities adds $25,000-$75,000 depending on hillside conditions and infrastructure age. Most Beverly Hills homeowners we work with are converting existing guest houses, pool houses, or underutilized interior spaces on estates built between 1920 and 1960 - structures that predate modern zoning but now qualify under California’s ADU streamlining laws. Call (747) 322-4648 to schedule your free estimate.
We’re Ellery ADU Studio, a design-build practice that handles the drawings, the permit set, and the construction under one contract at one written price. Our Los Angeles office coordinates dispatch and scheduling for Beverly Hills properties. Junior ADU & Interior Conversion is often the fastest path to a permitted rental unit here, since the city enforces strict architectural design standards that favor matching existing structures over new ground-up builds.
Why Beverly Hills Homes Are Different
Beverly Hills operates its own Building & Safety department entirely separate from LADBS, and the city resisted California’s ADU mandate more aggressively than almost any municipality before state law forced compliance. That history means the permit process remains meticulous and slower than neighboring cities.
The dominant ADU opportunity isn’t new construction. It’s the legalization of existing mid-20th-century detached guest houses, “maid’s quarters,” and carriage houses on large estate lots - structures built before modern zoning that were never permitted as dwelling units. Bringing them to code requires navigating Beverly Hills’s own standards, not county or state shortcuts.
The flats south of Santa Monica Boulevard hold 1920s-1960s estates in Spanish Colonial Revival, Tudor Revival, and early Mid-Century Modern styles on lots from 7,000 to 20,000 square feet. These properties often have detached multi-car garages or pool houses that serve as primary conversion targets. Hillside properties north of Sunset run larger but face expansive, unstable soils on the alluvial slopes of the Santa Monica Mountains - the city routinely requires soils and geology reports for any new foundation, a cost and timeline burden flat-lot projects in West Hollywood or Culver City rarely encounter.
Beverly Hills also enforces objective architectural design standards that effectively require an ADU to match the primary residence’s style. A 1930s Spanish Colonial on Roxbury Drive will face pushback if the ADU presents a flat-roof contemporary facade. Neighboring cities have largely abandoned such prescriptive layers under state pressure, but Beverly Hills has defended its objective standards ordinance.
Our Main Beverly Hills Services
These are the three services Beverly Hills homeowners call about most, in addition to the two detailed below.
ADU Design & Permitting in Beverly Hills
We produce the full permit set - architectural plans, structural calculations, Title 24 energy compliance, and drainage plans - then shepherd it through Beverly Hills’s independent Building & Safety department. The city’s historical resistance to ADU streamlining means the permit set quality determines timeline more than anywhere else we work. ADU Design & Permitting in Beverly Hills is where every project starts, and where most projects that fail do so.
Garage Conversion ADU in Beverly Hills
Detached multi-car garages on the flats are common conversion targets, though many lack adequate slab depth or ceiling height for residential code. We assess structural capacity, design the upgrade, and handle the permit path for changing occupancy from accessory to dwelling unit. Garage Conversion ADU in Beverly Hills typically moves faster than new detached construction because the envelope already exists.
New Detached ADU in Beverly Hills
New construction on Beverly Hills estates makes sense when no existing structure is viable for conversion or when the hillside site demands a purpose-engineered foundation. Soils reports, grading plans, and architectural design standards compliance add layers here that garage conversions avoid. New Detached ADU in Beverly Hills requires the most thorough pre-design investigation of any service we offer in this city.
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.
Before
AfterJunior ADU & Interior Conversion in Beverly Hills
Junior ADU & Interior Conversion in Beverly Hills focuses on bringing existing interior space or small detached structures up to code as permitted dwelling units - the most practical path on estates where guest houses, pool houses, or maid’s quarters predate modern zoning but now qualify under state streamlining. The city’s architectural design standards favor this approach, since matching an existing 1940s structure to a 1920s main house is straightforward compared to designing a contemporary new build that satisfies the objective standards ordinance. Hillside properties add complexity with aging infrastructure and seismic considerations, but the core advantage holds: the envelope exists, the style is established, and the permit path, while slow, is proven. Junior ADU & Interior Conversion is often the fastest return on investment for Beverly Hills homeowners who bought high between 2015 and 2025 and are now building long-term rental income.
Room-to-ADU Conversion
Signs you need it
You have a ground-floor bedroom wing, former staff quarters, or enclosed porch with separate exterior access that could become a self-contained unit with a kitchenette and full bath.
What it costs in Beverly Hills
Room-to-ADU Conversion typically runs $85,000-$140,000 all-in, drawings through final inspection, depending on whether the existing space needs structural reinforcement for seismic compliance.
How we do it
We measure and document the existing space, design the kitchenette and bath layout to meet JADU code, produce the permit set for Beverly Hills’s design standards review, then build to the drawings with a documented photo record on every visit.
Basement ADU
Signs you need it
Your estate has a walk-out basement with ceiling height at or near 7 feet 6 inches, separate entry, and existing utility rough-ins that were never completed.
What it costs in Beverly Hills
Basement ADU typically runs $110,000-$180,000 all-in, drawings through final inspection, with hillside properties on the north side of Sunset often requiring drainage and waterproofing upgrades that flats properties avoid.
How we do it
We assess ceiling height, natural light compliance, and emergency egress paths, then design the full unit with mechanical ventilation, produce the permit set including drainage plans for hillside sites, and build with the 365-Day Done Right Promise in writing.
What Junior ADU & Interior Conversion Costs in Beverly Hills
| Item | Typical range in Beverly Hills |
|---|---|
| Room-to-ADU Conversion | $85,000-$140,000 |
| Basement ADU | $110,000-$180,000 |
| Above-Garage ADU | $95,000-$155,000 |
Can a Junior ADU have its own address in Beverly Hills?
No - a Junior ADU shares the primary residence’s address and utility meter, which is why the owner must live in either the main house or the JADU. This limitation keeps JADU permits simpler than full ADUs but restricts rental arrangements.
How long does Junior ADU permitting take in Beverly Hills?
Beverly Hills’s independent Building & Safety department typically takes 4-6 months for JADU permit approval, longer than LADBS jurisdictions because the city maintains its own design standards review. Call (747) 322-4648 for a timeline assessment on your specific property.
ADU Site Prep & Utilities in Beverly Hills
ADU Site Prep & Utilities in Beverly Hills addresses the infrastructure gap between an existing estate and a code-compliant dwelling unit - the work that happens before or alongside the conversion build. Hillside properties north of Sunset routinely need soils reports and foundation engineering for any new structural work, while flats properties south of Santa Monica Boulevard more often face aging electrical panels and undersized sewer laterals from the 1950s-1960s that cannot handle an additional kitchen and bath. The city’s utility coordination runs through its own departments, not LADWP or county water directly, adding a procedural layer unique to this municipality. ADU Site Prep & Utilities is where we handle these prerequisites under the same single contract as the conversion itself.
Foundation & Grading
Signs you need it
Your existing accessory structure sits on a deteriorating slab, or you’re building new on a hillside lot where Beverly Hills requires a soils and geology report before foundation design.
What it costs in Beverly Hills
Foundation & Grading typically runs $25,000-$55,000 for hillside properties with expansive soils, or $15,000-$30,000 on flats lots with stable ground and minimal cut-and-fill.
How we do it
We commission the soils report, engineer the foundation to city geologist approval, pull the grading permit, and pour to the structural drawings with inspection at each phase.
Electrical Panel Upgrade
Signs you need it
Your main panel is rated under 200 amps, has fused disconnects rather than breakers, or shows corrosion from coastal air infiltration in older hillside conduit runs.
What it costs in Beverly Hills
Electrical Panel Upgrade typically runs $8,000-$18,000 including the new panel, conduit replacement to code, and Beverly Hills electrical permit with inspection.
How we do it
We calculate the new load with the ADU included, specify the panel and service size, coordinate the city electrical permit, and install with utility disconnect scheduling to minimize downtime.
What ADU Site Prep & Utilities Costs in Beverly Hills
| Item | Typical range in Beverly Hills |
|---|---|
| Foundation & Grading | $15,000-$55,000 |
| Electrical Panel Upgrade | $8,000-$18,000 |
| Plumbing Lateral | $12,000-$28,000 |
Does Beverly Hills require a soils report for every ADU?
Not every ADU - hillside properties north of Sunset routinely require soils and geology reports for new foundations, while flats properties with existing slabs often avoid this step if the slab tests adequate for residential loads.
Who handles utility coordination with Beverly Hills?
We coordinate all utility work through the city’s own departments as part of our single-contract scope - the homeowner does not interface separately with LADWP or sewer districts. Call (747) 322-4648 to review what your property’s infrastructure needs.
Brands We Service in Beverly Hills
We specify and coordinate prefab and modular systems from Cover, Dvele, and Mighty Buildings within our single-contract design-build model, integrating these units with site-specific foundation and utility work rather than treating them as standalone drops. Our brands page details compatibility with Beverly Hills’s architectural design standards.
Pricing for ADU in Beverly Hills, CA
| Service | Typical range in Beverly Hills |
|---|---|
| Room-to-ADU Conversion | $85,000-$140,000 |
| Basement ADU | $110,000-$180,000 |
| Above-Garage ADU | $95,000-$155,000 |
| Foundation & Grading | $15,000-$55,000 |
| Electrical Panel Upgrade | $8,000-$18,000 |
| Plumbing Lateral | $12,000-$28,000 |
| Gas Line Extension | $5,000-$15,000 |
| Landscaping & Hardscape | $8,000-$25,000 |
Price drivers in Beverly Hills include hillside soils reports, architectural design standards compliance, and the city’s slower permit timeline, which extends carrying costs. Under Haven Standard Clause 1, every project receives a written price before any work starts - no call-for-quote, no door-side upsells.
Neighborhoods We Serve in Beverly Hills
We work across Beverly Hills’s distinct zones, from the estate lots of the flats to the hillside properties above Sunset, with crews dispatched from our Los Angeles office. Response time for initial consultation is typically 24-48 hours throughout the city.
- The Flats (south of Santa Monica Blvd)
- Trousdale Estates
- Beverly Hills Post Office (BHPO)
- North Beverly Hills (north of Sunset)
- Golden Triangle
Service Area - Cities Near Beverly Hills
We serve homeowners throughout the Westside and San Fernando Valley, including West Hollywood, CA, Studio City, CA, Culver City, CA, and Sherman Oaks, CA. Each city has its own permit environment and housing stock characteristics, and we adjust our permit sets and construction sequencing accordingly.
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 its own Building & Safety department entirely separate from LADBS, with stricter design standards review and typically longer timelines - 4-6 months for JADU permits versus 2-3 months in many L.A. neighborhoods. The city’s historical resistance to state ADU mandates means staff scrutinize streamlining claims more carefully.
California state law limits HOA prohibitions on ADUs, but Beverly Hills HOAs can enforce design covenants that affect exterior materials, rooflines, and visibility from common areas - constraints we address during permit set production rather than discovering them mid-construction.
Yes - matching the primary residence’s architectural style is effectively required under Beverly Hills’s objective design standards, and our permit sets include material specifications, roof pitch diagrams, and facade elevations that satisfy this review before construction begins.
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."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."Every allowance was itemised at the start, so the finish selections did not turn into a surprise at the end."
- Benedict H.