A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Westlake Village, CA
Adding an ADU in Westlake Village starts with a question every homeowner asks: what will it actually cost, and what will the city let me build? As a Westlake Village ADU company, we answer both in writing before any work begins. Homes here sit on generous lots with mature landscaping and rolling terrain, which means setbacks, drainage, and access for prefab panels all shape the price more than people expect. Call (903) 568-7222 for a free estimate with a written line-item price.
Why Westlake Village Homes Are Different
Westlake Village homes tend to date from the late 1960s through the 1980s, with a mix of single-story ranchers and larger two-story properties in neighborhoods like Foxmoor Hills, The Glen, and North Ranch. Many lots slope, and several neighborhoods fall under HOA architectural review, which adds a layer of approval before an ADU or room addition gets permitted. The climate is dry and warm most of the year, so construction rarely hits weather delays, but clay-heavy soils in parts of Westlake Village can require deeper footings than a standard foundation plan assumes. Mature oak trees on many properties also mean working around protected root zones, which changes where an ADU can sit and how foundation trenches get dug. If you live on a hillside lot, plan for retaining considerations and stepped foundations, which most flat-lot ADU builders never mention.
Our Main Westlake Village Services
Most Westlake Village homeowners call Benson ADU Builders for one of three projects: building a new ADU, expanding a home with a full addition, or adding a single room. Each has its own Westlake Village page with pricing, timelines, and local details.
ADU Builders in Westlake Village
An ADU in Westlake Village is a self-contained living unit with its own kitchen, bathroom, and entrance, built on the same lot as the main house. We build both site-built and prefab ADUs, including brands like Abodu, Cover, and Dvele, which means you can pick a floor plan you’ve actually walked through online before we break ground. Westlake Village lots often have rear or side yard space that works well for a detached unit, but setbacks and HOA guidelines vary by neighborhood. Read the complete breakdown on our ADU Builders in Westlake Village page.
Home Addition Contractor in Westlake Village
A home addition in Westlake Village usually means expanding the footprint of the main house, not building a separate unit. That could be a larger kitchen, a new primary suite, or a family room extension. Older homes in Westlake Village often have dated floor plans that benefit from opening up a rear wall and extending into the yard. We handle the foundation, framing, roofing, and the finishing work, and we use James Hardie cladding when matching existing siding matters. See typical scopes and what to budget on our Home Addition Contractor in Westlake Village page.
Room Addition Contractor in Westlake Village
A room addition in Westlake Village is the smallest of the three: a single bedroom, a home office, or a second bathroom tacked onto the existing structure. It typically costs less than a full addition and moves faster through permitting because the structural change is smaller. Still, Westlake Village hillside lots can complicate even a single-room bump-out if drainage or retaining comes into play. Get the complete guide on our Room Addition Contractor in Westlake Village page.
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 Westlake Village
We’re authorized to build with Abodu, Cover, and Dvele prefab ADUs, and we stock James Hardie cladding for Westlake Village jobs. Parts for these systems are readily available, so mid-project changeouts don’t stall the schedule. See the full lineup on our brands page.
Pricing for ADU Company in Westlake Village, CA
Below are the ranges homeowners in Westlake Village should expect when they ask us for a ballpark. Every project gets a written line-item price before work starts, not after.
| Service | Typical range in Westlake Village |
|---|---|
| Detached ADU (site-built) | $180,000 – $320,000 |
| Detached ADU (prefab, e.g. Abodu or Cover) | $160,000 – $260,000 |
| Garage conversion ADU | $90,000 – $150,000 |
| JADU (conversion within existing home) | $70,000 – $120,000 |
| Home addition (full kitchen or primary suite) | $120,000 – $220,000 |
| Home addition (family room or rear extension) | $90,000 – $170,000 |
| Room addition (single bedroom or office) | $45,000 – $85,000 |
| Bathroom addition (within room addition) | $35,000 – $60,000 |
| Foundation upgrade for sloped lot | $10,000 – $30,000 |
| Drainage and retaining for hillside work | $8,000 – $25,000 |
Two things push prices higher in Westlake Village compared with flat-lot cities: sloped foundations and HOA-mandated finishes. When you call for an estimate, we walk the lot and give you a written number that includes those conditions from day one.
Neighborhoods We Serve in Westlake Village
Our crews work across Westlake Village, and we schedule every job with a confirmed arrival window so you’re not waiting around all day. The neighborhoods below are the ones we see most often, but if yours isn’t listed, call and ask.
- Foxmoor Hills
- The Glen
- North Ranch
- Westlake Trails
- Southshore Hills
Most Westlake Village estimates are scheduled within a few business days, and the written quote arrives the same day as the site visit.
Service Area – Cities Near Westlake Village
Along with Westlake Village, we take projects in nearby cities including Thousand Oaks, CA, Agoura Hills, CA, Oak Park, CA, and Newbury Park, CA. Scheduling comes from our Los Angeles office, but the crews you’ll see are assigned locally to Westlake Village and the surrounding area.
Serving Westlake Village, CA - Our Local Coverage Area
We’re based in the Westlake Village 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 Westlake Village
Most projects start within a few weeks of signing. The variable is permitting and HOA review, which we handle for you. Once the permit is in hand, we give a written start date and stick to it.
Some do, some don’t, and many have design rules you must follow before the city will issue a permit. We review your HOA’s architectural guidelines with you before you commit, so there are no surprises after you’ve paid for plans.
No. Your written price covers the scope we agreed on. If you add something mid-project, we price it as a written change order before any work happens. No surprises billed after the fact. Call (903) 568-7222 to get your Westlake Village estimate started.
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 Westlake Village 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.
