A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in West Hills, CA
Fielding ADU Builders handles ADU construction, garage conversions, and room additions in West Hills, CA. Most West Hills lots give us room to work, but the hillside terrain and older housing stock create real challenges that a flat-lot builder never sees. We price the work in writing before we start, pull permits the right way, and stand behind every job for a full year under The Garrison Standard. Call (361) 315-4177 when you want a straight answer on whether your West Hills property can support the addition you’re planning.
Why West Hills Homes Are Different
West Hills sits at the western edge of the San Fernando Valley, where streets climb into the foothills and the flat Valley grid gives way to sloped lots, retaining walls, and drainage patterns that shift from one block to the next. A good share of the housing stock dates from the 1960s and 1970s, so we regularly deal with post-and-beam framing, older electrical panels, and foundations that have settled enough to need attention before a room addition or ADU goes on top.
The hillside factor matters more here than most people expect. The City of Los Angeles applies hillside grading and foundation standards to many West Hills parcels, and ADU work on a sloped lot often requires a soils report, deeper footings, and stepped foundations. That adds cost and time compared to a flat lot in the Valley proper, but it also means the work has to be done by a builder who understands hillside drainage and retaining. Drainage is the issue we talk about most with West Hills homeowners: water moves downhill fast after a winter rain, and an ADU or addition that interrupts that flow will cause problems for the neighbor below you and for your own foundation. We design for that from day one.
Our Main West Hills Services
Homeowners in West Hills call us most often for three things: adding a room, converting the garage they never park in, and building a backyard ADU. Each of those jobs has its own page with local pricing and the details that apply to this area.
Room Addition Contractor in West Hills
A room addition in West Hills usually means going up on a hillside lot or out into a backyard that slopes. We handle the foundation work, the grading, the drainage, and the framing, and we coordinate with the city on the permits. Many West Hills homes have flat or low-slope roofs from the original 1960s build, so tying a new addition into the existing roofline takes some care. We figure that out before you sign anything. See Room Addition Contractor in West Hills for the full breakdown of what a room addition costs here.
Garage Conversion Contractor in West Hills
Many West Hills garages were built for two cars and now hold one car and a pile of boxes. A garage conversion turns that space into a studio, a bedroom, or a home office without touching the footprint of the house. On hillside lots, the conversion often requires bringing the slab up to current code and adding insulation and a vapor barrier because the original garage was never conditioned space. We deal with that every week. See Garage Conversion Contractor in West Hills for local pricing and what the job involves.
ADU Builders in West Hills
West Hills yards are often wide enough for a detached ADU, and the city’s ADU rules allow more square footage than many homeowners realize. The catch is usually the slope and the setback requirements, which is why we start every West Hills ADU with a site visit to check the grade and review what the city will allow before we quote a number. We build both prefab ADUs and conventional stick-built units. See ADU Builders in West Hills for the full picture on costs, permits, and timelines for this area.
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 West Hills
We work with prefab and modular ADU platforms including Cover, Dvele, and Boxabl, and we have the relationships to get units ordered and delivered to West Hills without the delays homeowners often hit when they buy direct. Parts and components for these systems are sourced through our supplier network, which keeps turnaround tighter than a homeowner going it alone. See our brands for the full lineup we work with.
Pricing for ADU Company in West Hills, CA
| Service | Typical range in West Hills |
|---|---|
| Detached ADU (prefab, 400 – 500 sq ft) | $180,000 – $260,000 |
| Detached ADU (conventional build, 400 – 500 sq ft) | $200,000 – $310,000 |
| Garage conversion ADU (existing garage shell) | $95,000 – $160,000 |
| Garage conversion (finished studio, no plumbing) | $55,000 – $95,000 |
| Room addition (primary suite, 300 – 400 sq ft) | $130,000 – $210,000 |
| Room addition (family room or office, 200 – 300 sq ft) | $95,000 – $155,000 |
| Hillside foundation upcharge (where required) | $18,000 – $45,000 |
| Soils report and grading plan (hillside lots) | $3,500 – $8,500 |
Hillside lots in West Hills push prices toward the upper end of these ranges because of the extra foundation work, drainage design, and grading that flat-lot projects never need. The number we put in writing before work starts is the number on the final invoice, and that includes any hillside work we identify during the site visit.
Neighborhoods We Serve in West Hills
We work throughout West Hills, from the flat streets near Victory Boulevard up into the hillside neighborhoods. Our crew is local to the area, so response time for the initial site visit is typically within a few business days.
- West Hills north of Roscoe Boulevard, including the hillside streets off Valley Circle
- The neighborhoods around West Hills near Platt Avenue and the streets feeding into Shadow Ranch Park
- West Hills south of Saticoy Street, including the flatter lots near the Victory Boulevard corridor
- The hillside properties above Bell Canyon Road and along the western edge of the community
Service Area – Cities Near West Hills
Beyond West Hills, our crews cover the surrounding San Fernando Valley communities. If you’re in Canoga Park, CA, Woodland Hills, CA, Calabasas, CA, or Chatsworth, CA, the same written-price policy and one-year written guarantee apply. Scheduling is coordinated from our Los Angeles office, and the crews that serve West Hills work these nearby areas as well.
Serving West Hills, CA - Our Local Coverage Area
We’re based in the West 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 About ADU Company in West Hills
Yes. Hillside lots in West Hills often trigger additional city review for grading, drainage, and foundation design, which can add several weeks to the permit timeline and real cost to the project. We identify what applies to your parcel during the site visit, before you commit to anything. Call (361) 315-4177 for an exact assessment of your lot.
Some West Hills neighborhoods have HOAs with architectural review requirements, though state law limits what an HOA can restrict on ADU construction. If your home is in an HOA, we’ll tell you what to submit and when. Call (361) 315-4177 and we’ll help you figure out what applies.
Site visits are typically scheduled within a few business days, and the permit timeline depends on whether your lot is flat or hillside and whether the city requires extra review. Flat-lot jobs often start sooner than hillside jobs. Call (361) 315-4177 to get on the schedule for a free estimate.
Call (361) 315-4177 to schedule a free estimate for your West Hills ADU, garage conversion, or room addition. You’ll get a written price before any work starts, and every job is backed by the 365-Day Done Right Promise.
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 West Hills Customers Say
"Honest feedback on what the lot could fit. Told me up front what would fit on the lot and what the setbacks would allow."
- Rita C."Clear price breakdown. Change orders were all in writing."
- Hal P."Solid job. Cabinet delivery was a week behind but they worked around it."
- Ben G.
