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
Fielding ADU Builders is the ADU and room-addition specialist inside the Garrison Partners family, building garage conversions, backyard units, and room additions across Calabasas. Homes here sit on canyon lots, ridge lines, and HOA-governed streets, which means setback rules, slope conditions, and design review vary block by block. We put the price in writing before any work starts and stand behind every project with a one-year written guarantee. Call (361) 315-4177 to schedule a free estimate.
Why Calabasas Homes Are Different
Calabasas housing stock runs from 1960s ranch homes in Mulwood and Calabasas Hills to larger 1980s and 1990s builds in The Oaks and guard-gated communities like Mountain View Estates. That spread matters: older homes often have undersized electrical panels that need a service upgrade before an ADU can pull permits, while newer HOA neighborhoods bring design-review requirements that shape exterior finishes, rooflines, and even window placement.
The terrain is the other constant. Many Calabasas lots slope, especially along Mulholland Highway, Old Topanga Canyon Road, and the streets above Las Virgenes Road. A sloped lot changes foundation engineering, drainage plans, and sometimes triggers a setback variance (the city’s written permission to build closer to the property line than the standard rule allows). We handle that paperwork as part of the permit package, not as a surprise add-on.
Our Main Calabasas Services
Most Calabasas homeowners call us about one of three projects: adding square footage to the existing house, converting an attached garage into living space, or building a detached ADU in the backyard. Each has its own page with pricing, timelines, and the local permit realities that shape the job.
Room Addition Contractor in Calabasas
A Calabasas room addition expands the main house, whether that means a primary suite, a family room, or a second-story bump-out. On older ranch homes in neighborhoods like Mulwood, the job often begins with a structural and electrical assessment, since the original framing and panel were not sized for modern loads. We price the full scope in writing before demolition starts. Read more on our full Room Addition Contractor in Calabasas page.
Garage Conversion Contractor in Calabasas
Garage conversions in Calabasas turn an existing attached or detached garage into a permitted living unit, home office, or rental. The local wrinkle is parking: Calabasas requires replacement parking for many conversions, and some HOA communities restrict garage conversions entirely. We confirm what your specific property allows before you commit. See the full breakdown on our Garage Conversion Contractor in Calabasas page.
ADU Builders in Calabasas
Backyard ADUs in Calabasas range from compact one-bedroom units to two-story, two-bedroom homes with full kitchens. We build conventional wood-frame ADUs, prefab units from Abodu, Cover, Dvele, and Mighty Buildings, and everything in between, matched to your lot and budget. Several Calabasas neighborhoods sit within hillside overlay zones, which adds slope review and sometimes retaining-wall work. Full scope and costs are on our ADU Builders in Calabasas 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 Calabasas
We work with leading prefab and modular ADU platforms including Abodu, Cover, and Dvele, plus conventional builds using James Hardie siding. That means we can match the right build method to your Calabasas lot, budget, and HOA constraints. See our brands for the full list.
Pricing for ADU Company in Calabasas, CA
| Service | Typical range in Calabasas |
|---|---|
| Garage conversion (per sq ft) | $95 – $185 |
| ADU construction (per sq ft) | $225 – $425 |
| Room addition (per sq ft) | $150 – $350 |
| Detached ADU (1-bed, 500 sq ft) | $112,500 – $212,500 |
| Detached ADU (2-bed, 800 sq ft) | $180,000 – $340,000 |
| Prefab ADU (1-bed, 500 sq ft, all-in) | $115,000 – $245,000 |
| Prefab ADU (2-bed, 800 sq ft, all-in) | $185,000 – $355,000 |
| Garage conversion (500 sq ft, studio) | $47,500 – $92,500 |
| Garage conversion (650 sq ft, 2-bed) | $61,750 – $120,250 |
| Room addition (500 sq ft) | $75,000 – $175,000 |
Calabasas prices run toward the upper end when the lot slopes, the property sits in an HOA with strict design review, or the existing panel needs a service upgrade. Every quote we give is a written price before any work starts, so the number you approve is the number on the final invoice.
Neighborhoods We Serve in Calabasas
We work throughout Calabasas, from the established streets of Mulwood and Calabasas Hills to the gated communities along Parkway Calabasas and the larger lots off Mulholland Highway. Response times across the city are typically one to two business days for an estimate visit, depending on scheduling volume.
- Mulwood
- Calabasas Hills
- The Oaks
- Mont Calabasas
- Mountain View Estates
Service Area – Cities Near Calabasas
Fielding ADU Builders also serves homeowners in neighboring communities, including Woodland Hills, CA, West Hills, CA, Topanga, CA, and Canoga Park, CA. Dispatch and scheduling are coordinated from our Los Angeles office; crews serve Calabasas locally.
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
Most Calabasas homeowners get an estimate visit within one to two business days. Call (361) 315-4177 and a live person answers, any hour, to schedule. We do not use voicemail or callback queues.
Yes. We prepare and submit the permit package, including any HOA design-review submissions your community requires. The Garrison Code covers it: by the book, every time. Call (361) 315-4177 with your address and we will check what your specific property needs.
No. You receive a written price before any work begins, and that number is what you pay. If site conditions reveal something hidden, we discuss it with you in writing before proceeding. Call (361) 315-4177 for a free estimate.
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
"Built a detached ADU behind our house. The builder is a veteran and runs the site like a platoon: schedule posted, crew on time, everything labeled. Finished within a few days of the date."
- Ken W."Room addition over the back patio. Framing is square, windows are tight, and the roofline matches."
- Danny L."Foundation and slab poured on schedule. Crew kept the yard orderly."
- Marian J.
