ADU Company in Chino Hills, CA
Chino Hills adds a layer of complexity to ADU work that most Inland Empire cities don’t have. Rolling hillside lots, CAL FIRE fire-hazard designations, and a web of HOA communities mean a standard flat-lot plan won’t cut it here. We’re Lodgewick ADU Builders, the ADU company of the Kingswell family, and we build accessory dwelling units, garage conversions, and home additions that actually get permitted and built on Chino Hills terrain. Every project starts with a written price, a real arrival window, and a written guarantee. Call (254) 602-5618 to talk through your lot.
Why Chino Hills Homes Are Different
Most of Chino Hills was built out in the 1980s and 1990s as planned tracts: three-car garages, generous rear yards, and streets that wind through the hills instead of sitting on a grid. That last part matters more than people expect. A significant share of lots here have meaningful grade changes, which means retaining walls, engineered foundations, and grading plans that flat-lot cities like Chino simply never deal with. If a bid for your Chino Hills ADU looks suspiciously close to a quote from a flatland contractor, ask whether they’ve actually walked your slope.
The other reality is fire. Much of Chino Hills sits in CAL FIRE High or Very High Fire Hazard Severity Zones, and any new detached structure has to meet Chapter 7A requirements: Class A roofing, ember-resistant vents, ignition-resistant siding. Santa Ana winds funnel through the canyons and amplify wildfire risk, which is exactly why the city enforces these standards. Add Title 24 energy compliance for summers that routinely push past 105°F, and you can see why a Chino Hills ADU needs more engineering hours than the same plan in Ontario.
Then there are the HOAs. Vellano, The Preserve, and dozens of smaller associations have CC&Rs that look like they ban ADUs outright. Since AB 3182 took effect in January 2021, HOAs can no longer prohibit them, but they can still impose design review. We handle the HOA architectural submittal alongside the city permit set, so your project doesn’t stall at a board meeting.
Our Main Chino Hills Services
These are the three jobs Chino Hills homeowners call us about most. Each has its own Chino Hills page with local pricing, permit realities, and project timelines.
Home Addition Contractor in Chino Hills
A home addition in Chino Hills usually means building out over a sloped rear yard or bumping out a second story, which brings grading and structural engineering into the conversation on day one. We’ve also seen plenty of additions triggered by growing families in the 1980s-era tracts where the original floor plans just don’t flex. Every addition here needs to clear both City of Chino Hills plan review and, in many communities, an HOA architectural committee. We prepare both submittals together so you’re not waiting on one while the other sits. Learn more on our Home Addition Contractor in Chino Hills page.
Garage Conversion Contractor in Chino Hills
Those three-car garages that came standard in Chino Hills tracts make conversions one of the most practical ADU paths here. Converting an attached garage means less new foundation work, which is a real advantage on a hillside lot, though you’ll still need to address insulation, HVAC, and fire-rated separation from the main house. Detached garage conversions often need roof upgrades to meet current fire and energy codes. The Garage Conversion Contractor in Chino Hills page walks through costs and timelines.
ADU Builders in Chino Hills
Detached ADUs in Chino Hills are where the terrain, fire codes, and HOA rules all converge. A backyard unit on a graded lot needs engineered plans that account for slope stability, drainage, and retaining. In High Fire Hazard Severity Zones, every material choice gets scrutinized against Chapter 7A, from vents to siding to roof assembly. We’ve templated the Chino Hills permit path, including HOA design review, so the process moves without surprises. See our ADU Builders in Chino Hills page for full details.
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 Chino Hills
We work regularly with Cover, Dvele, and Boxabl systems, and we know which of them performs best on a sloped Chino Hills lot versus a flat one. We keep a running understanding of local lead times and handle warranty coordination directly with the manufacturer. See our brands for what we service.
Pricing for ADU Company in Chino Hills, CA
| Service | Typical range in Chino Hills |
|---|---|
| Garage conversion (attached, no structural changes) | $110,000 – $175,000 |
| Detached ADU (prefab, simple site) | $230,000 – $380,000 |
| Detached ADU (custom, sloped lot with retaining) | $400,000 – $550,000+ |
| Home addition (single room bump-out) | $140,000 – $210,000 |
| Home addition (primary suite addition) | $180,000 – $350,000 |
| Home addition (full second story) | $400,000 – $650,000+ |
| Site prep, grading, and retaining (Chino Hills hillside lots) | $25,000 – $80,000+ |
What pushes Chino Hills pricing up is the combination of engineered foundations on sloped lots, Chapter 7A fire-resistant materials in hazard zones, and HOA design-review iterations. Before any work starts, you get a written price, and that number does not change at the door.
Neighborhoods We Serve in Chino Hills
Our crews work throughout Chino Hills, from the gated communities in the hills to the flatter tracts near the 71. Most estimates can be scheduled within a few business days.
- Vellano
- The Preserve at Chino Hills
- Butterfield Ranch
- Los Serranos
- Carbon Canyon
Service Area – Cities Near Chino Hills
While this page is focused on Chino Hills, we also serve the surrounding area. If you’re in Pomona, CA, Diamond Bar, CA, Chino, CA, or Montclair, CA, each of those pages covers local conditions and pricing for your city.
Serving Chino Hills, CA - Our Local Coverage Area
We’re based in the Chino 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 Chino Hills
Our scheduling team coordinates from our Inland Empire office and typically gets a crew to a Chino Hills home within a few business days. Call (254) 602-5618 and a live person answers, 24/7, to set the appointment.
Yes, but not the way many homeowners fear. AB 3182 stops HOAs from prohibiting ADUs, but they can still require design review. We prepare the HOA submittal alongside the city permit set so both tracks move together. Call (254) 602-5618 to talk about your HOA’s specific rules.
It can. If your parcel sits in a CAL FIRE High or Very High Fire Hazard Severity Zone, Chapter 7A requires fire-resistant materials that add cost over standard construction. We’ll identify your zone during the first site visit and price it in writing before any work starts. Call (254) 602-5618 for your specific number.
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 Chino 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