A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Calabasas, CA
Benson ADU Builders handles accessory dwelling units, home additions, and room additions across Calabasas, from the gated enclaves off Mulholland Highway to the hillside lots above Calabasas Lake. Calabasas jobs look different from the rest of Los Angeles County: homes sit on varied terrain, many lots back up to protected open space, and the city’s planning review process moves at its own pace. We put a written price in front of you before any work begins, then back it with our 365-Day Done Right Promise. For a direct answer on your project, call (903) 568-7222.
Why Calabasas Homes Are Different
Calabasas is not a flat-grid suburb. The city’s housing stock ranges from 1970s ranch-style homes in the Mulwood and Calabasas Hills neighborhoods to newer custom builds in The Oaks and the guard-gated communities along Parkway Calabasas. Hillside lots often mean sloped foundations, retaining walls, and drainage considerations that a flat-lot build never encounters. Homes in the older sections off Las Virgenes Road frequently have original electrical panels that need a separate service upgrade before an ADU can be permitted.
The Santa Monica Mountains influence every project. Wildfire-adjacent lots in areas like Mont Calabasas and the neighborhoods above Old Topanga Canyon Road must meet stricter defensible-space and exterior-materials rules. Many Calabasas properties also fall within HOA jurisdictions that have their own design-review layer on top of city permitting. We have worked through both, and we flag HOA requirements in writing before you commit to a design. Summers here are hot and dry, which pushes us toward exterior claddings and insulation specs that hold up without constant maintenance.
Our Main Calabasas Services
Most Calabasas homeowners call us for one of three projects: a detached or attached ADU, a full home addition, or a single room addition. Each has its own page with local specifics and pricing details.
ADU Builders in Calabasas
Detached backyard units and garage conversions make up the bulk of our Calabasas ADU work. A lot of homes off Lost Hills Road have oversized lots that can fit a one- or two-bedroom unit without eating into usable yard space. The terrain matters: a sloped site changes foundation costs quickly. We build with Abodu, Cover, Dvele, and Mighty Buildings prefab systems, which shorten on-site construction time compared to a traditional site-built frame, and we handle the design review and permitting paperwork as part of the job. See the full breakdown here: ADU Builders in Calabasas.
Home Addition Contractor in Calabasas
A home addition in Calabasas usually means adding square footage to expand a kitchen, create a primary suite, or extend a living area. Older homes off Mulholland Highway often have post-and-beam framing that requires careful tying-in to meet current seismic standards. We write the structural scope into your upfront price so there is no mid-project surprise. Full details and local cost ranges: Home Addition Contractor in Calabasas.
Room Addition Contractor in Calabasas
Single room additions, like a home office off the back of the house or a ground-floor bedroom, are common in Calabasas neighborhoods where moving is not worth it but space is tight. Because many lots slope, a room addition often needs pier-and-grade-beam footings rather than a simple slab. We scope that from the first conversation and put it in writing before work starts. The complete Calabasas room addition guide is here: Room Addition Contractor in Calabasas.
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.
Brands We Service in Calabasas
We schedule service and warranty work on ADU and addition projects built with Abodu, Cover, and Dvele systems, plus James Hardie cladding on site-built work. Parts and replacement panels are ordered through our brand-direct supply channels, which keeps most warranty turnarounds under two weeks. Full details on our brands.
Pricing for ADU Company in Calabasas, CA
| Service | Typical range in Calabasas |
|---|---|
| Prefab ADU, 1-bedroom (Abodu or Mighty Buildings) | $180,000 – $240,000 |
| Prefab ADU, 2-bedroom (Dvele or Cover) | $260,000 – $350,000 |
| Site-built ADU, 1-bedroom | $200,000 – $280,000 |
| Site-built ADU, 2-bedroom | $300,000 – $410,000 |
| Garage conversion to ADU | $140,000 – $200,000 |
| Attached JADU (up to 500 sq ft) | $90,000 – $140,000 |
| Kitchen addition | $110,000 – $170,000 |
| Primary suite addition | $140,000 – $210,000 |
| Single room addition (office or bedroom) | $80,000 – $130,000 |
| Electrical panel upgrade (if required) | $3,500 – $6,000 |
Hillside foundations, HOA design review, and wildfire-zone exterior requirements are the three biggest cost drivers in Calabasas. Whatever the final number, you get it in writing before work starts, and it does not move unless you change the scope.
Neighborhoods We Serve in Calabasas
We work across Calabasas and the surrounding hills, with current and past projects in these areas:
- Calabasas Hills and Mulwood
- The Oaks and Mont Calabasas
- Parkway Calabasas and Calabasas Park
- Lost Hills and Saratoga Hills
- Old Topanga Canyon Road corridor
Most Calabasas service visits are scheduled within a few business days, and our scheduling team confirms a live arrival window the day before.
Service Area – Cities Near Calabasas
Our Calabasas crews also cover nearby areas in the West Valley and Santa Monica Mountains. Homeowners in Woodland Hills, CA, West Hills, CA, Topanga, CA, and Canoga Park, CA can reach the same scheduling line and get the same written-price promise.
Serving Calabasas, CA - Our Local Coverage Area
We’re based in the Calabasas 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 Company in Calabasas
Yes. Our team prepares the plan set and submits to the city of Calabasas, and we manage the HOA design-review package when your community requires one. You get a marked-up timeline in writing so you know exactly which review is happening when.
A prefab ADU from Abodu, Cover, or Dvele typically takes four to seven months from permit submission to final inspection in Calabasas. Site-built units run longer, often eight to twelve months depending on site conditions and review cycles. Your written price includes a schedule with key milestones.
Only if you change the scope. Our written price covers the work we agreed on, and any change request gets its own line-item quote before we proceed. That is the whole point of The Relay Visibility Guarantee. Call (903) 568-7222 for a free estimate on your project.
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 Calabasas Customers Say
"Booked a consult online and met the project manager two days later. Weekly progress updates arrived by text with photos. ADU finished on schedule."
- Hannah W."Clean, quiet crew. They respected the neighbors, kept noise to working hours, and swept the driveway every evening."
- Hope C."Communication was the best part. I always knew what was happening that week without having to ask."
- Dolly N.
