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 typical home addition or ADU in Beverly Hills runs $45,000-$130,000 for attached work and $90,000-$220,000 for detached units, with most projects requiring 4-8 months from permit to final inspection. We’re Rowan Construction Group, and our crews serve Beverly Hills from our Los Angeles office, handling everything from Trousdale Estates hillside builds to flat-lot garage conversions south of Santa Monica Boulevard. Call (213) 652-7670 to schedule your free estimate - we’ll bring a written price before anyone picks up a tool.
Why Rowan Construction Group Los Angeles Is Beverly Hills’s Preferred Home Additions & ADU Company
We’ve delivered 4,000-plus projects since 2007, every one with a written price before work started and a documented photo record when the crew left. In Beverly Hills, that discipline matters more than most places. The city’s independent building department, separate from LADBS, means plan checkers here know the details of Fault Rupture Hazard Zone studies and WUI fire assemblies cold - and they’ll kick back a package that skimps on either.
Our Beverly Hills customers leave reviews citing the same thing: the quote matched the final invoice within a few percent. That isn’t luck. Under Clause 1 of The Haven Standard, the price is written before anyone starts. No change proceeds without a signed change order. On a recent Trousdale Estates detached ADU, the client brought us a competitor’s estimate and we reviewed it line by line at no charge - our Free Second Opinion - finding $34,000 in missing utility-trench and fire-assembly allowances.
Calls are answered by a live person 24/7. Crews are background-checked and uniformed. Every visit includes a documented photo record as standard, not an upgrade. The 365-Day Done Right Promise is printed on every page, backed by a terms page, not an asterisk.
Our Home Additions & ADU Services in Beverly Hills
ADU Design & Permitting
ADU design and permitting in Beverly Hills means navigating a building department that answers to its own Architectural Commission, not Los Angeles. We prepare submittals that include fault-line studies for hillside parcels, WUI compliance documentation for Very High Fire Hazard Severity Zone lots, and discretionary design review packets the Commission expects to see formatted a specific way. A package built for Bel Air or Brentwood will stall here. We know the plan checkers by name, and we know what triggers a hold.
Garage Conversion ADU
Garage conversions in the flats south of Santa Monica Boulevard often start with 1920s-1950s structures sitting on aging infrastructure - knob-and-tube wiring, cast-iron drain lines, unreinforced chimneys. We scope the full gut behind the preserved façade, because the quote has to account for what we find. A garage conversion in Beverly Hills typically runs $30,000-$80,000, but a flat price only works when the exploratory demolition is priced as a line item with a written change-order threshold.
New Detached ADU
New detached ADUs are our most requested Beverly Hills project, especially in Trousdale Estates and the hillside north of Sunset. These builds trigger the full suite: fault-line studies, seismic setbacks, Class A fire-rated roofing, ember-resistant vents, and often a septic-to-sewer tie-in or utility trench across 100-plus feet of driveway. Our crew built a 700-square-foot detached unit in Trousdale on a steep open lot where the county-scaled permitting package included all of the above, plus a grading swale the plan checker flagged during a pre-pour walk. We corrected it before the pour, not after. The final inspection cleared clean.
Junior ADU & Interior Conversion
Junior ADUs - units carved from existing floor area, no exterior expansion - avoid some hillside triggers but still face Beverly Hills’s historic review if the host structure is a designated or eligible Paul R. Williams or A. Quincy Jones design. We run the city’s historic inventory before quoting, because a redesign after permit submission kills both timeline and budget. Interior conversions in the flats’ Spanish Colonial Revival or Tudor Revival homes also mean working around plaster lath, balloon framing, and lead-abatement protocols that don’t apply to post-1978 construction.
ADU Site Prep & Utilities
Site prep on a Beverly Hills hillside lot is not suburban grading. Long material hauls up Trousdale or narrow driveway access on the flats mean crane and pump truck bookings that must be reserved before the quote goes out. Utility work often involves septic-to-sewer conversion, well abandonment, or 140-foot trench runs across existing hardscape. We scope these as line items with real vendor quotes, not allowances that evaporate when the excavator arrives.
Room Additions
Room additions in Beverly Hills - whether a master suite expansion or a ground-floor great room - must tie into existing systems that were never designed for the load. We photograph and document the condition of the existing substrate, the shingle layer count, the drain line material, and the electrical panel capacity before the written price leaves our office. The customer receives that photo record as standard.
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.
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AfterTrusted Brands We Service in Beverly Hills
We source across fifty-plus vetted brands, which means the written quote contains honest numbers rather than inflated ones. For Beverly Hills ADU and addition projects, we regularly specify KraftMaid and Wellborn cabinetry, Cambria and Caesarstone countertops, and Kohler and Toto fixtures. On the prefab side, we work with Abodu and Cover for clients who want a manufactured unit delivered to a prepared foundation, and with Dvele and Mighty Buildings for higher-end modular builds where the factory finish matches the site’s trophy-build context. We stock local supplier relationships for fast turnaround on trim-out materials, so a held permit doesn’t turn into a held project.
Common Home Additions & ADU Problems We See in Beverly Hills Homes
- Assuming LADBS rules apply. Beverly Hills plan checkers require separate fault-line and WUI documentation, and a submittal that mirrors a Bel Air or Brentwood package will be kicked back and stall the draw schedule. We build every package for this jurisdiction specifically.
- Underestimating material haul and equipment access on hillside lots. Long pulls up Trousdale or the flats’ narrow driveways inflate delivery costs and scope of work, and a missing crane or pump truck booking lands on the punch list. We verify access with a site visit before quoting.
- Treating an existing 1950s-60s home as demo-ready without checking historic review status. A Williams- or Jones-designed home can trigger Beverly Hills’s historic review process, stalling demolition permits and forcing redesign after allowances have been quoted. We run the inventory first.
- Ignoring the Santa Monica Fault’s impact on foundation design. Fault Rupture Hazard Zone setbacks can shift a planned ADU footprint by 50 feet or more, and the study itself adds 4-6 weeks to permitting. We flag this in the first consultation.
Pricing for Home Additions & ADU in Beverly Hills, CA
Here’s what a written quote from Rowan Construction Group contains before any work starts:
| Project Type | Typical Range in Beverly Hills |
|---|---|
| Home Addition (attached) | $45,000 - $130,000 |
| ADU Construction (detached) | $90,000 - $220,000 |
| Garage Conversion ADU | $30,000 - $80,000 |
These ranges reflect Beverly Hills’s specific cost drivers: fault-line studies and WUI fire assemblies on hillside lots, discretionary design review timelines that extend carrying costs, historic review contingencies, and long-haul material access that suburban builds don’t face. A flat price only works when every contingency is scoped and written. Under Clause 1 of The Haven Standard, that’s exactly what we deliver. Call (213) 652-7670 for your free estimate - we’ll review your site, your existing conditions, and your permit path, then put a number in writing you can screenshot and compare.
We Also Serve Cities Near Beverly Hills
Our Home Additions & ADU crews work throughout the metro, including Beverly Hills and neighboring West Hollywood, Studio City, Culver City, and Sherman Oaks. Each city carries its own permitting jurisdiction and cost structure; we scope 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 - Home Additions & ADU in Beverly Hills
Yes, if the parcel lies within the Santa Monica Fault Rupture Hazard Zone, which covers significant hillside areas north of Sunset including Trousdale Estates. The study identifies surface fault traces and establishes mandatory setbacks that can shift your foundation footprint by 50 feet or more. We order the preliminary fault map in our first site review so the design accounts for it before permitting. Call (213) 652-7670 and we’ll check your parcel against the zone map at no charge.
Beverly Hills additions carry three cost layers Los Angeles and West Hollywood don’t: the city’s independent plan check and Architectural Commission review, Fault Rupture Hazard Zone and WUI fire-assembly requirements on hillside lots, and historic review contingencies for mid-century homes. These add soft costs (studies, extended permitting timelines) and hard costs (fire-rated assemblies, specialized foundations) that scale with project value, not just square footage. We itemize every layer in the written quote so you see where the number comes from.
Not necessarily. Beverly Hills maintains its own historic inventory separate from Los Angeles, and homes by Paul R. Williams, A. Quincy Jones, or other significant architects often trigger discretionary review even if not formally landmarked. We’ve seen demolition permits stalled for months while the Commission evaluates significance, forcing redesigns after construction loans are already drawn. We run the city’s inventory and consult with planning staff before quoting any demo-dependent project. Call (213) 652-7670 and we’ll verify your property’s status in the first meeting.
Open hillside lots in Beverly Hills often retain legacy septic systems or wells that must be abandoned or tied into city sewer and water mains before new construction proceeds. The septic-to-sewer tie-in on our Trousdale project required rough-in and inspection before slab work, and the 140-foot utility trench across existing driveway hardscape meant saw-cutting, bedding, and restoration as separate line items. Standard suburban builds rarely encounter this. We scope utility work with real vendor quotes, not allowances.
We design grading plans that satisfy Beverly Hills’s pre-pour walk requirements, which are stricter than LADBS’s typical inspection protocol. On our Trousdale build, the plan checker flagged a swale during the pre-pour walk; we corrected it before the pour, avoiding a post-pour ripout that would have added weeks and thousands. Every hillside quote includes a grading contingency tied to geotechnical recommendations, with a signed change-order threshold for unforeseen bedrock or groundwater. The photo record documents every lift and compaction test.
Ready to price your Beverly Hills addition or ADU? Call (213) 652-7670 to schedule your free estimate. We’ll bring a written scope, a flat price, and a clear permit path - before anyone picks up a tool.
Written by Grant Rowan, Owner at Rowan Construction Group, serving Beverly Hills since 2007.