A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Hidden Hills, CA
Fielding ADU Builders handles ADU construction, garage conversions, and room additions in Hidden Hills, CA with a written price before any work starts. Hidden Hills is a gated, equestrian-zoned community in the western San Fernando Valley, and that changes how every job runs: access requires resident coordination, lot sizes run large, and the city’s planning expectations follow the look and scale of the existing neighborhood. If you’re weighing an attached ADU, a detached unit near a barn or stable, or a garage conversion on a hillside lot, call (361) 315-4177 and we’ll walk you through what’s realistic for your property.
Why Hidden Hills Homes Are Different
Hidden Hills is not a typical suburban build site. The community is gated, which means crews have to be scheduled through resident-approved gate access, and many properties sit on one-acre or larger lots with significant grade changes, mature oak trees, and equestrian facilities already in the footprint. A backyard ADU that works on a flat Calabasas lot can hit a slope, a protected tree, or a horse trail setback in Hidden Hills and require a different foundation approach or a design that steps with the grade.
The housing stock here is largely custom ranch-style and traditional single-family homes built from the 1950s onward, with very few attached multi-family structures. That favors detached ADUs and garage conversions where the existing structure is sound. It also means the city will look closely at exterior materials and rooflines to keep new structures consistent with the surrounding streetscape. Hidden Hills also has a strong equestrian identity, and if your ADU sits near a riding trail or paddock, drainage, fencing, and dust control become part of the plan. We treat those as first-order concerns, not afterthoughts.
Permitting runs through the City of Hidden Hills, and the city enforces its building and zoning standards directly. If your lot has unusual dimensions, a hillside condition, or a requested setback variance (the city’s written permission to build closer to the property line than the standard rule allows), the written price we give you accounts for that before we submit anything.
Our Main Hidden Hills Services
Most Hidden Hills homeowners call us about one of three jobs: adding square footage to the main house, converting an existing garage into living space, or building a detached ADU. Each has its own page below with the details for Hidden Hills.
Room Addition Contractor in Hidden Hills
A room addition in Hidden Hills usually means expanding a single-story ranch outward rather than building up, because hillside setbacks and existing rooflines make second-story work less common. We handle the structural tie-in to the existing slab, matching stucco or siding, and roofline transitions that look original to the house. Hidden Hills lots often have the space to add a bedroom suite, a home office, or a larger kitchen without encroaching on equestrian areas. See the full breakdown here: Room Addition Contractor in Hidden Hills.
Garage Conversion Contractor in Hidden Hills
Garage conversions in Hidden Hills run into a specific issue: many attached garages were built as car storage and workshop space, so the slab, ceiling height, and electrical service often need upgrades before the space can legally become a bedroom or rental ADU. We inspect the existing structure, price the concrete and utility work honestly, and handle the plans the city will ask for. The work is permitted and covered by the same written one-year guarantee as every other project. Details here: Garage Conversion Contractor in Hidden Hills.
ADU Builders in Hidden Hills
Detached ADUs in Hidden Hills typically follow one of two paths: a conventional build with James Hardie siding and custom rooflines, or a prefab platform like Abodu, Cover, or Dvele when speed and a fixed plan matter more than custom design. We have working fluency with all three platforms and will give you a straight comparison of cost and timeline for your lot. Hillside foundations and tree setbacks are the two conditions that most affect Hidden Hills ADU pricing. Full detail here: ADU Builders in Hidden Hills.
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 Hidden Hills
We work directly with James Hardie siding, Abodu, Cover, and Dvele systems for Hidden Hills projects, which means parts and panel orders don’t sit waiting on unknown third parties. Turnaround on materials depends on the platform and the lot conditions, but we put the expected lead time in writing with the price. See our brands for the full list.
Pricing for ADU Company in Hidden Hills, CA
| Service | Typical range in Hidden Hills |
|---|---|
| Detached ADU (conventional, 400 – 800 sq ft) | $180,000 – $340,000 |
| Detached ADU (prefab, 400 – 800 sq ft) | $130,000 – $260,000 |
| Garage conversion (attached, 400 – 500 sq ft) | $65,000 – $120,000 |
| Garage conversion with new garage rebuild | $110,000 – $190,000 |
| Room addition (single room, 200 – 400 sq ft) | $70,000 – $160,000 |
| Primary suite addition (400 – 600 sq ft) | $110,000 – $220,000 |
| Kitchen extension (200 – 400 sq ft) | $80,000 – $180,000 |
| Permit fees and drawings | $6,000 – $18,000 |
| Site prep, drainage, and foundation correction | $10,000 – $45,000 |
Hillside lots, oak tree setbacks, and equestrian-adjacent drainage requirements are the three factors that push most Hidden Hills quotes above the low end. Whatever the number is, it goes in writing before any work starts. The price you approve on day one is the price on the final invoice.
Neighborhoods We Serve in Hidden Hills
We cover every neighborhood inside the Hidden Hills gate, including:
- Long Valley Road and the equestrian properties along it
- Round Meadow Road and the homes around the school
- Jed Smith Road and the west-side lots near the trail network
- Oakfield Lane and the cul-de-sac lots off it
- North and south sides of the gated community boundary
Within Hidden Hills, response time for an estimate visit is typically a few business days once gate access is confirmed by the resident.
Service Area – Cities Near Hidden Hills
Fielding ADU Builders serves Hidden Hills directly and handles projects in nearby communities across the region. If you’re outside the gate but close by, we also work in Los Angeles, CA, Long Beach, CA, Anaheim, CA, and Riverside, CA. Scheduling is coordinated from the brand’s Los Angeles office, and crews serve Hidden Hills locally.
Serving Hidden Hills, CA - Our Local Coverage Area
We’re based in the Hidden 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 Hidden Hills
Yes. We confirm gate access with the resident before any crew or vehicle enters Hidden Hills, and our teams carry the identification the community asks for. You do not have to manage visitor passes or entry logistics once the project is scheduled.
Hidden Hills enforces its zoning directly, and the two most common requirements we see are hillside foundation reports and setback variances for irregular lots. We include drawings, surveys, and city submittals in the written price, so you will know the permit path before any money changes hands. Call (361) 315-4177 for a free estimate.
A garage conversion usually runs 4 to 7 months from plans to final inspection. A detached ADU, conventional or prefab, typically runs 6 to 12 months depending on foundation work, utility connections, and city review times. We put the schedule in writing with the price, and the written one-year guarantee starts the day the work is complete.
Call (361) 315-4177 to schedule a free estimate. Reed Calloway and the Fielding ADU Builders team will walk your Hidden Hills lot, price the job in writing, and tell you straight what it will take to build it right.
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 Hidden Hills Customers Say
"Solid job. Cabinet delivery was a week behind but they worked around it."
- Ben G."Insulation, drywall, and finishes were all well done. Feels like part of the house."
- Pete O."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.
