Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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AfterFast, Reliable Home Additions & ADU Across Beverly Hills
A home addition in Beverly Hills typically runs $45,000 to $130,000, while a new detached ADU usually lands between $90,000 and $220,000 depending on site conditions and finishes. Those numbers change fast once you factor in Beverly Hills’s own Building & Safety Division, hillside geotechnical requirements, and the finish level buyers expect in a city where homes routinely list for eight figures. We’re Barrett & Sons Construction, founded in 1998 and still owner-operated by Tom Barrett. Our Home Additions & ADU team handles the entire process, from first sketch to final inspection, with permits pulled and every change order in writing before work moves forward. Call Tom’s sons at (877) 610-1318 for a free estimate.
Why Barrett & Sons Construction Is Beverly Hills’s Preferred Home Additions & ADU Company
Beverly Hills has its own building department, its own plan-check queue, and its own amendments to the California Building Code. That trips up contractors who file through LADBS and watch the permit bounce back. We know the Beverly Hills Building & Safety Division’s process because we’ve been through it repeatedly, on everything from flat-lot room additions in 90212 to hillside ADUs off Mulholland Drive. Tom Barrett publishes his name, address, and license number, and he’s the one who answers the phone when you call. Not a call center, not a sales rep.
Our customers in Beverly Hills tend to ask the same things: can we get past plan check without endless correction cycles, can we match the existing architectural character of a 1930s Spanish Colonial Revival, and will the crew respect the fact that their neighbors are often high-profile. Our answers: pre-application meetings with the city’s plan checkers, written change orders before any scope shift, and background-checked crew members who carry the Barrett name. Tom’s sons run the crews on-site most days.
We also come back. The 90-Day Done Right Promise is written on every contract. If something isn’t right, one call brings Tom back to make it right. Ask anyone on your street, or look up the license number yourself.
Our Home Additions & ADU Services in Beverly Hills
ADU Design & Permitting
The City of Beverly Hills runs its own plan-check process, separate from LADBS, and its fee schedule and correction cycles are unique to this municipality. We handle the full design package, structural engineering, and permit coordination. For a Beverly Hills ADU, expect plan check to involve Beverly Hills-specific amendments to the California Building Code, and we navigate those directly. A pre-application meeting with the city’s small plan-check staff can save months on a project timeline.
Garage Conversion ADU
Garage conversions in Beverly Hills typically run $30,000 to $80,000. The flats south of Santa Monica Boulevard, in the 90211 and 90212 areas, are full of 1920s and 1930s garages with undersized electrical panels and original footings that need structural review. Many of these conversions require trenching across postage-stamp Beverly Hills lots for new utilities, which gets expensive quickly. We quote that work upfront, in writing.
New Detached ADU
A new detached ADU in Beverly Hills runs $90,000 to $220,000. Hillside parcels in the 90210 zip add real scope: caisson-supported foundations or cut-and-fill pad work, engineered drainage, and, in the Wildland-Urban Interface, CAL FIRE Chapter 7A exterior requirements such as Class A roofing and ember-resistant vents. These aren’t optional add-ons. They’re code, and skipping them fails inspection.
Junior ADU & Interior Conversion
A junior ADU carved out of an existing Beverly Hills home is often the most budget-conscious path, occasionally starting near $45,000. Interior conversions mean working around original lath-and-plaster walls and aging cast-iron supply lines in the pre-1950 stock. We assess plumbing and electrical early so the allowance on paper matches the job in the wall. Because Home Additions & ADU in Beverly Hills often grow into broader projects, we coordinate closely when the scope extends beyond the ADU itself.
If the project scope expands, we also handle Kitchen Remodeling in Beverly Hills, and Bathroom Remodeling in Beverly Hills so you’re not juggling multiple contractors on one property.
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 install Simonton windows, Ply Gem siding and trim, and PGT impact-rated products where Beverly Hills hillside conditions or homeowner preference call for them. These are brands you can look up, not mystery materials off a van. Because we carry premium product lines across multiple trades, the finish schedule in a Beverly Hills ADU or addition matches what’s already in the main house. If a window seal fails during the warranty period, we handle the replacement through the manufacturer directly.
Common Home Additions & ADU Problems We See in Beverly Hills Homes
- Hillside foundation surprises. North of Sunset in 90210, homes sit on cut-and-fill pads or caisson foundations. Additions and ADUs there often require geotechnical reports and engineered retaining before vertical construction starts. We include that in the initial scope, not as a surprise change order.
- Beverly Hills plan-check correction cycles. The city’s Building & Safety Division has its own turnaround times and its own local code amendments. Filing through LADBS out of habit is a common mistake that wastes weeks. We file directly with Beverly Hills from day one.
- Undersized electrical and plumbing in 1920s-1950s homes. The flats between Wilshire and Santa Monica Boulevard hold a dense grid of original Spanish Colonial Revival and Tudor homes with panels and supply lines never meant for modern accessory dwellings. Service upgrades and re-pipes are common line items.
- Wildland-Urban Interface code triggers. Hillside parcels in 90210 fall under CAL FIRE Chapter 7A. That means Class A roofing assemblies, ember-resistant vents, and ignition-resistant cladding on any attached addition or exterior wall. We spec these materials correctly and pass the inspection the first time.
Pricing for Home Additions & ADU in Beverly Hills, CA
What moves the number: flat-lot versus hillside, soil conditions, Beverly Hills permit fees, plan-check corrections, finish level, and whether the existing panel and service need upgrading. We give you a written, line-item quote before work begins, and every price change arrives as a written change order before a single nail moves. Call (877) 610-1318 to schedule your free estimate. Tom Barrett will walk the site himself.
We Also Serve Cities Near Beverly Hills
If your project sits just outside city limits, we regularly work in Century City, West Hollywood, Culver City, and Hollywood. The same crew, the same written change orders, the same 90-Day Done Right Promise. Call (877) 610-1318 and we’ll tell you straight whether your property is in our service area.
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 - Home Additions & ADU in Beverly Hills
How quickly can you respond to Beverly Hills?
We answer the phone live, 24/7, and we can typically schedule an estimate in Beverly Hills within a few business days. Since our scheduling is coordinated from our Los Angeles office and crews serve Beverly Hills locally, we aren’t dispatching strangers from two counties away. Call (877) 610-1318 and you’ll speak to a person who knows the Beverly Hills market.
Do you cover all Beverly Hills neighborhoods?
Yes, we work throughout the city, including the flats south of Santa Monica Boulevard, the neighborhoods around Roxbury Park and the Beverly Hills High School area, the commercial-adjacent blocks near Wilshire, and the hillside estates north of Sunset in the 90210 zip. Coverage spans 90209, 90210, 90211, and 90212. If you’re unsure, call and ask.
Does Beverly Hills building code make ADUs harder than in neighboring cities?
Harder is the wrong word; different is more accurate. Beverly Hills operates its own Building & Safety Division with its own plan-check queue, local amendments to the California Building Code, and inspection protocols. A contractor who files through LADBS by force of habit gets bounced. We file directly with Beverly Hills and know the local plan checkers. That familiarity can cut months off a high-end project timeline.
How does your pricing compare to contractors in surrounding LA neighborhoods?
Beverly Hills pricing runs higher than nearby LA neighborhoods for a reason: the city’s permit fees, plan-check correction cycles, and the liability of working on $5M to $30M residential lots. Our home addition range of $45,000 to $130,000 and ADU range of $90,000 to $220,000 reflect that local reality. We quote in writing and never surprise you at the end. Call (877) 610-1318 for an exact number on your property.
What warranty do you offer in Beverly Hills?
Every completed job carries the 90-Day Done Right Promise, written on the contract. If something isn’t right, Tom Barrett comes back and makes it right with one phone call. That applies to additions, ADUs, garage conversions, and every trade we touch. Call (877) 610-1318 for details.
Ready to talk about your Beverly Hills Roofing, addition, or ADU? Call (877) 610-1318 for a free estimate. Tom Barrett or one of his sons will answer, walk the site, and put the scope in writing before anything moves. No trip charge inside the county, free second opinion on any written estimate, and a permanent 10% discount for seniors and veterans.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Windows & Doors - Beverly Hills and the surrounding area since 1998.