ADU Company in Hidden Hills, CA
We’re Lodgewick ADU Builders, the ADU company of the Kingswell family, and we believe Hidden Hills is one of the most interesting places in California to build an accessory dwelling unit. The city’s minimum one-acre lots, equestrian heritage, and strict architectural review process mean every project here requires more planning than a comparable build in Calabasas or Woodland Hills. Whether you’re converting a barn, reclassifying a guesthouse, or starting fresh with a detached unit, we put a written price in front of you before any work begins. Call (254) 602-5618 and we’ll walk you through what’s realistic for your property.
Why Hidden Hills Homes Are Different
Hidden Hills is California’s only fully gated, incorporated equestrian city. That single fact shapes nearly every ADU conversation we have here. Lots are large, typically a full acre or more, and many include horse barns, stables, tack rooms, and older guest cottages that were never touched by modern building codes. Those structures are often the most attractive ADU conversion candidates under state law, but they arrive with a catch: Hidden Hills runs a dual-approval process. You need city building permits and sign-off from the Hidden Hills Community Association’s architectural review committee. California Civil Code §4751 prevents the HHCA from banning ADUs outright, but the committee still holds authority over design, materials, and aesthetics. That adds months and real cost to a project, and it’s a hurdle homeowners in surrounding cities simply don’t face.
The housing stock compounds the complexity. Most Hidden Hills homes are sprawling ranch-style and custom estate builds from the 1950s through the 1980s. Many came with legally non-conforming ancillary structures, buildings that predate modern ADU law. When we walk a property, the first question is usually whether an existing structure can be converted or whether new construction makes more sense. Since the 2000s, a wave of tear-downs and rebuilds has also added newer custom estates, and those often include permitted guesthouses that need reclassification rather than new framing.
Climate matters here too. Hidden Hills sits in the western San Fernando Valley, where summer highs routinely top 100°F and Santa Ana winds push wildfire risk up. The city falls within a Cal Fire Wildland-Urban Interface zone, so detached ADUs must meet fire-resistant construction standards: Class A roofing, ember-resistant vents, and ignition-resistant siding. Oversizing HVAC for the radiant heat that builds up in detached structures is a standard design consideration we plan for from day one.
Our Main Hidden Hills Services
Most Hidden Hills homeowners reach out to us about one of three things: building a new ADU, converting a garage, or adding square footage to their existing home. Each service has its own dedicated Hidden Hills page where we go deep on local costs and process.
Home Addition Contractor in Hidden Hills
A home addition in Hidden Hills means working around an existing estate, often on a lot with equestrian zoning and HOA design review hanging over every elevation change. We handle the full scope: foundation, framing, roofing, HVAC, and finish work, with fire-resistant materials spec’d for the Wildland-Urban Interface requirements. The Kingswell Guarantee applies here just as it does on an ADU: written price before work starts, a real arrival window, and a written guarantee on the completed build. Home Addition Contractor in Hidden Hills is the page to read for detailed pricing and process.
Garage Conversion Contractor in Hidden Hills
Garage conversions in Hidden Hills often come with a hidden wrinkle: many garages on older equestrian estates were built alongside barns and stables, sometimes under agricultural permits that never anticipated residential use. That means a conversion can trigger Title 24 energy compliance, residential fire separation, and new plumbing stub-outs. We price that reality upfront rather than discovering it midway through. Garage Conversion Contractor in Hidden Hills covers what to expect, including the cost ranges specific to this city.
ADU Builders in Hidden Hills
Building a detached ADU in Hidden Hills is a different animal from the flatlands. The HHCA architectural review adds design constraints, the WUI zone adds fire-resistance requirements, and the one-acre lots mean longer utility runs and more site work. We work with prefab manufacturers like Abodu, Cover, and Dvele when they fit the lot and timeline, and we handle stick-built when they don’t. Every project starts with a written price, not a ballpark. Read ADU Builders in Hidden Hills for a full breakdown.
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 with leading ADU prefab brands and materials suppliers including Abodu, Cover, and Dvele, matched to each Hidden Hills lot’s setbacks, fire-zone requirements, and HOA design standards. James Hardie siding is a frequent spec here for ignition resistance. See our brands for the full list.
Pricing for ADU Company in Hidden Hills, CA
| Service | Typical range in Hidden Hills |
|---|---|
| Detached ADU (new construction, 600 – 800 sq ft) | $180,000 – $320,000 |
| Detached ADU (new construction, 1,000+ sq ft) | $380,000 – $650,000 |
| Garage conversion to ADU | $110,000 – $210,000 |
| Barn or stable conversion to ADU | $220,000 – $450,000 |
| Detached ADU (prefab, 600 – 800 sq ft) | $190,000 – $330,000 |
| Detached ADU (prefab, 1,000+ sq ft) | $360,000 – $600,000 |
| Guesthouse reclassification (no new framing) | $12,000 – $40,000 |
| Home addition (300 – 500 sq ft) | $120,000 – $280,000 |
| JADU conversion (existing space) | $75,000 – $150,000 |
What pushes cost up in Hidden Hills more than anywhere nearby is the HHCA review cycle and the WUI fire-resistance materials. Both add real dollars and real months. That’s why we put the written price in front of you before work starts, every time, no exceptions.
Neighborhoods We Serve in Hidden Hills
Hidden Hills is a small city, roughly 1.7 square miles, but the character shifts block to block. We work across all of it, from the estate-lined streets near the Long Valley Road gate to the equestrian-heavy lots in the northern half of town.
- Long Valley Road corridor and gate area
- Round Meadow Road and surrounding equestrian lots
- Jed Smith Road and the northern stable zone
- Spring Valley Road and adjacent estate parcels
- Mureau Road boundary area near the Calabasas edge
Response time for an estimate visit in Hidden Hills is typically within a few business days, and scheduling is coordinated from our Los Angeles office with crews serving the city locally.
Service Area – Cities Near Hidden Hills
While this page is focused on Hidden Hills, we also work in the surrounding metro. If you’re in Los Angeles, CA, Long Beach, CA, Anaheim, CA, or Riverside, CA, each city has its own page with local pricing and process details.
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
The HHCA architectural review typically adds 3 to 6 months over a comparable project in Calabasas or Woodland Hills. The committee reviews design, materials, and aesthetics, and revisions are common. Call (254) 602-5618 and we’ll give you a realistic timeline for your specific lot.
Usually yes, but it’s rarely cheaper than new construction. Unpermitted barns and stables were never built to residential code, so conversions trigger full Title 24 energy compliance, residential fire separation, and new plumbing stub-outs. We price that honestly upfront. Call (254) 602-5618 for a written estimate.
Yes. Hidden Hills falls within a Cal Fire Wildland-Urban Interface zone, so detached ADUs require Class A roofing, ember-resistant vents, and ignition-resistant siding. These materials add roughly 8 – 15% to wall and roof assembly costs. Call (254) 602-5618 and we’ll spec it accurately.
Ready to talk about your Hidden Hills property? Call (254) 602-5618 for a free estimate, and we’ll give you a written price before any work begins. That’s the Kingswell Guarantee, and it’s in writing on every project.
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
"I was nervous about adding on but they walked me through every step and every cost before we started. No surprise change orders halfway through like I'd heard horror stories about."
- Eleanor Pratt"Junior ADU conversion inside the house. They protected the rest of our place with plastic and daily cleanup. Done nearly on schedule and on the number they quoted."
- Sabrina Veld"Garage conversion into an office and guest room. Fair written price, finished close to on schedule, and they fixed a small drywall crack under warranty months later without any hassle."
- Diana Cho