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 handles accessory dwelling units, garage conversions, and room additions in Calabasas, where the work runs on different rules than most of Los Angeles County. Large estate lots in guard-gated communities, strict HOA design review, hillside setbacks, and Wildland-Urban Interface fire codes all shape what gets built and what it costs. If you’re weighing an ADU on a Calabasas property, call (559) 254-0116 and we’ll walk through what your lot can actually support.
Why Calabasas Homes Are Different
Calabasas housing stock is mostly large single-family homes built from the 1980s forward, many in Mediterranean or Spanish style with stucco exteriors. That means ADU work here leans toward attached units, garage conversions, and detached backyard structures sized to match the primary home rather than squeeze in. In neighborhoods like Mulwood, older ranch homes from the pre-1980 era are common candidates for garage conversions or backyard cottages, where the existing structure gives you a head start.
The bigger variable is the terrain. Properties along the Santa Monica Mountains foothills and in hillside communities like Mountain View Estates sit on slopes that change foundation design, drainage, and retaining wall requirements. A flat-lot plan that works in the Valley often will not survive first contact with a Calabasas hillside. Then there is fire code. Calabasas falls under Wildland-Urban Interface requirements, which means fire-resistant siding, ember-resistant vents, and defensible space. Those are not optional upgrades; they are the permit baseline. Homeowners in guard-gated communities like The Oaks also deal with HOA design standards that can require the ADU to match the main house’s roofline, stucco color, and window style, which pushes cost and lead time.
Our Main Calabasas Services
Most Calabasas homeowners come to us for one of three projects, and each has its own page with local pricing and specifics.
Room Addition Contractor in Calabasas
A room addition in Calabasas typically means expanding a primary residence to match how a family actually lives: a larger primary suite, a home office, a second living area, or a ground-floor guest wing. On a flat Mulwood lot, additions tend to move quickly once plans are approved. On hillside parcels, expect foundation and retaining wall engineering to drive both timeline and budget. We price the job in writing before any work starts, and the crew that shows up is background-checked and uniformed. Learn more about Room Addition Contractor in Calabasas.
Garage Conversion Contractor in Calabasas
Garage conversions in Calabasas are one of the fastest ways to add a rentable unit or an in-law suite without building new square footage. Older ranch homes in Mulwood and throughout the city often have oversized two-car garages that convert cleanly into studio or one-bedroom ADUs. The main constraint is that the finished space must meet current building and fire codes, not the code that was in effect when the garage was first built. See the full scope and local pricing on our Garage Conversion Contractor in Calabasas page.
ADU Builders in Calabasas
Detached and attached ADUs on Calabasas estate lots give homeowners room to build something substantial, but HOA design review and fire-resistant material requirements are part of the equation from day one. We work with prefab platforms like Abodu, Cover, and Dvele where they fit the lot, and we also build conventional ADUs using James Hardie siding and other fire-rated materials. Written price first, one-year written guarantee included. More details on the 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
Our Calabasas projects regularly pair conventional framing with James Hardie siding for WUI compliance, and we work directly with prefab platforms like Abodu, Cover, and Dvele when the lot and HOA allow. Our our brands page names the full line. Turnaround on prefab panels and siding materials for Calabasas jobs runs about the same as the rest of the county, but plan on HOA review adding its own schedule.
Pricing for ADU Company in Calabasas, CA
| Service | Typical range in Calabasas |
|---|---|
| Detached ADU, prefab (Abodu, Cover, Dvele) | $180,000 – $350,000 |
| Detached ADU, conventional build | $220,000 – $420,000 |
| Attached ADU (junior or full) | $140,000 – $280,000 |
| Garage conversion to ADU | $120,000 – $220,000 |
| Room addition, ground floor | $90,000 – $250,000 |
| Room addition, second story | $150,000 – $350,000 |
| Primary suite addition | $130,000 – $300,000 |
| Foundation and retaining work (hillside lots) | $25,000 – $80,000 |
| Fire-resistant siding and WUI upgrades | $15,000 – $45,000 |
| HOA design compliance package | $5,000 – $20,000 |
Hillside foundations, retaining walls, WUI material upgrades, and HOA-required architectural matching are the four biggest cost drivers in Calabasas that a generic state estimate will not catch. Every price we quote goes in writing before work starts, so the number you approve is the number on the final invoice.
Neighborhoods We Serve in Calabasas
We cover the full Calabasas footprint, from guard-gated estate communities to older ranch neighborhoods. Expect our first visit within a single business day for most Calabasas properties.
- The Oaks
- Mountain View Estates
- Mulwood
- Calabasas Hills
- Calabasas Park
Service Area – Cities Near Calabasas
Our Calabasas crews also cover nearby communities across the western Valley and Santa Monica Mountains corridor. Homeowners in Woodland Hills, CA, West Hills, CA, Topanga, CA, and Canoga Park, CA can reach the same written-price-first, one-year-guarantee service by calling (559) 254-0116.
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
Plan on four to eight weeks for HOA design review in guard-gated communities like The Oaks and Calabasas Hills, and longer if the board requests revisions. We prepare the HOA package alongside the city permit set so the two reviews run at the same time where possible. Call (559) 254-0116 and we’ll tell you what your specific HOA requires.
Yes. Most Calabasas single-family lots fall within Wildland-Urban Interface zones, so ADUs must use fire-resistant siding, ember-resistant vents, and maintain defensible space. These items are part of the permit set we submit, not add-ons discovered mid-project. Estimates are free at (559) 254-0116.
No. The price we put in writing before any work starts is the price you pay, unless you change the scope. Hillside conditions are priced from a site visit, not a satellite image, so there is no surprise foundation or retaining wall line item later. Call (559) 254-0116 to schedule 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
"Good addition. Electrical inspection delayed a week, which was the county, but the build is great."
- Eva K."Solid job. Cabinet delivery was a week behind but they worked around it."
- Ben G."Room addition over the back patio. Framing is square, windows are tight, and the roofline matches."
- Danny L.
