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
Adding an ADU or home addition in Hidden Hills means working with a gated community, strict architectural standards, and lots that are larger than most of Los Angeles County. Our team handles the Hidden Hills permitting path from first survey to final inspection, with a written price delivered before any work starts. If you’re weighing a detached ADU, a garage conversion, or a room addition here, call (472) 248-8213 and we’ll walk you through what’s realistic for your specific lot.
Why Hidden Hills Homes Are Different
Hidden Hills is a fully gated city in the western San Fernando Valley, and that changes how construction works. Every project needs approval from the Hidden Hills Community Association before the city will even look at your plans. The association reviews rooflines, exterior finishes, setbacks, and even the placement of new structures relative to the street. This isn’t a bad thing, but it does mean the timeline has an extra step that a typical Los Angeles addition doesn’t face.
The lots here are mostly one to three acres, which gives us room to place a detached ADU without crowding the main house. But the same acreage brings grading questions, because much of Hidden Hills sits on rolling terrain. We regularly see projects where a small retaining wall or pier-and-beam foundation detail has to be worked into the plan. Homes in the city span from original 1950s ranch houses to larger recent builds, so the existing foundation and roofline dictate how an addition ties in. Setbacks here, the required gap between your new structure and the property line, are enforced strictly by both the association and the city.
Our Main Hidden Hills Services
Most Hidden Hills homeowners call us about one of three things: adding square footage to the main house, building a detached ADU, or converting an existing space into a livable room.
Home Addition Contractor in Hidden Hills
A home addition in Hidden Hills usually means extending the main footprint, building up, or converting an attached space like a garage into conditioned living area. The association requires that any addition match the existing architectural style, so we spend real time on rooflines, window patterns, and exterior materials before plans are submitted. Foundation work on Hidden Hills hillside lots often calls for pier-and-beam or reinforced slab details that aren’t needed on flatter ground. You can read the full scope of how we approach these projects on our Home Addition Contractor in Hidden Hills page.
ADU Builders in Hidden Hills
Detached ADUs are common in Hidden Hills because the lots can usually support a separate structure without giving up usable yard space. The Hidden Hills Community Association has specific standards for accessory structures, including maximum height, setback requirements, and exterior finish expectations. We work with prefab ADU manufacturers and traditional stick-built designs, and we’ll be straight with you about which makes sense after we see your lot and the association’s current design guidelines. More detail is on our ADU Builders in Hidden Hills page.
Room Addition Contractor in Hidden Hills
A room addition in Hidden Hills is often the fastest way to add a bedroom, office, or guest suite without touching the main house’s exterior look. We tie new work into the existing foundation and roofline so the addition reads as original construction. On hillside lots, that tie-in work is the part that separates a clean job from a call-back six months later. Our Room Addition Contractor in Hidden Hills page covers the process and what to expect from the association’s review.
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 install and service ADUs and exterior systems from our brands including Abodu, Cover, and Dvele, plus James Hardie cladding. For Hidden Hills projects with association design requirements, having firsthand experience with these product lines means we can tell you which systems are likely to pass review before you commit.
Pricing for ADU Company in Hidden Hills, CA
| Service | Typical range in Hidden Hills |
|---|---|
| Detached ADU, 400 – 600 sq ft | $180,000 – $240,000 |
| Detached ADU, 600 – 1,000 sq ft | $240,000 – $410,000 |
| Detached ADU, 1,000 – 1,200 sq ft | $410,000 – $520,000 |
| Attached ADU conversion | $120,000 – $220,000 |
| Garage conversion to ADU | $110,000 – $210,000 |
| Standard home addition, ground floor | $230 – $360 per sq ft |
| Second-story addition | $320 – $460 per sq ft |
| Primary suite addition | $160,000 – $310,000 |
| Room addition, single room | $90,000 – $170,000 |
| Prefab or modular ADU | $160,000 – $330,000 |
Hidden Hills pricing runs higher than the Los Angeles average because of association review requirements, grading on sloped lots, and the level of finish the community expects. Whatever the number, you’ll see it in writing before we start, and that written price does not change unless you change the scope.
Neighborhoods We Serve in Hidden Hills
We work throughout Hidden Hills, including the larger estate lots along Long Valley Road and the quieter streets that branch off Round Meadow Road. The whole city is roughly 1.7 square miles, so our crews move between job sites quickly once they’re on the ground.
- Long Valley Road area
- Round Meadow Road area
- Jed Smith Road area
- Oakfield Drive area
- Roxbury Street area
Service Area – Cities Near Hidden Hills
Most of our Hidden Hills clients come to us from the western Valley, but we also serve homeowners in Los Angeles, CA, Long Beach, CA, Anaheim, CA, and Riverside, CA. If you’re in one of those cities and considering an ADU or addition, the same written-price and Threshold Verified standards apply.
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
Most Hidden Hills ADU projects take 90 to 150 days for association and city approvals before construction begins. The association review is the variable, so we submit early and address their comments immediately. Call (472) 248-8213 and we’ll give you a realistic timeline for your specific lot.
Yes. We prepare all association submittal documents, attend any required design-review meetings, and coordinate revisions with the association and the city. You won’t be left to figure out the approval path on your own. Estimates are free, and the process starts with one call.
Yes, and most Hidden Hills lots have at least some grade. We typically use pier-and-beam or stepped foundations on hillside sites, and we’ll confirm what your lot needs during the estimate visit. Call (472) 248-8213 to schedule a free estimate and we’ll assess the grade in person.
If you’re ready to talk about an ADU or addition in Hidden Hills, call (472) 248-8213 today for a free estimate. We’ll send you a written price, walk you through the association process, and tell you exactly who will be on your property before they arrive.
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
"They handled the drawings and the permit paperwork for us. All I had to do was pick the finishes."
- Rosa M."Every crew member was vetted and carried a badge, which matters when they are around your family for months. Tidy site every day."
- Daniel F."Itemized estimate with allowances laid out. Final cost was within a hair of the quote."
- Naomi R.
