A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Chino Hills, CA
Chino Hills sits on rolling terrain where a flat buildable lot is the exception, not the rule. That changes how an ADU gets sited, graded, and connected to utilities. It also changes what you’ll pay, because hillside setbacks and soil work show up fast on a Chino Hills estimate. We’re Sutton ADU Builders, and we give every homeowner in Chino Hills a written price before any work begins, plus a 365-Day Done Right Promise that covers the finished build for a full year. If you’re weighing a detached ADU, a garage conversion, or a room addition, call (472) 248-8213 and we’ll walk the lot with you.
Why Chino Hills Homes Are Different
Chino Hills wasn’t built on a grid. Much of the housing stock climbs through the hills between the 71 and the 60, and that topography drives real construction decisions. We regularly see sloping backyards in neighborhoods like Butterfield Ranch and Los Serranos where a standard prefab ADU won’t sit level without some site work first. You’ll also find large-lot homes along Carbon Canyon and across the eastern edge of the city where access for equipment is tight, and the soil runs from decomposed granite to clay. That mixture affects drainage plans, and Chino Hills takes drainage seriously. A grading plan and a soils report are common asks before an ADU permit moves forward here.
Then there’s the housing stock itself. Chino Hills grew fast in the 1990s and 2000s, which means many garages were built as part of the original tract and were never meant to become living space. That’s fine, but it means a conversion usually needs insulation, a raised floor, and a new electrical subpanel to meet current code. The homes are newer than what you’d find in Pomona or Chino proper, but they age in predictable ways. We plan for that.
Our Main Chino Hills Services
These are the three projects Chino Hills homeowners call us about most. Each has its own page with local pricing and detail.
Home Addition Contractor in Chino Hills
A home addition in Chino Hills usually means attaching square footage to a hillside home without disturbing the existing roofline badly. We tie into the current foundation where possible and match stucco or siding to the original tract. Flatwork and drainage carry more weight here than on a flat lot, so the estimate includes site prep you won’t find on a generic quote. Home Addition Contractor in Chino Hills has the full breakdown.
ADU Builders in Chino Hills
ADUs in Chino Hills fall into two camps: detached units in side or rear yards, and garage conversions. Detached builds here often need a setback variance because many lots slope and the flat portion sits close to the house. Conversions usually need electrical and insulation work before drywall ever goes up. We work with prefab lines like Cover and Dvele when the lot can take them, and we’re honest when a site-built unit is the better call. ADU Builders in Chino Hills covers pricing and process.
Room Addition Contractor in Chino Hills
A room addition is the most flexible budget option, and in Chino Hills it’s often a primary suite or a home office tacked onto a side wall. The local wrinkle is window placement: with hillside views, you want glass on the right side, and that affects structural shear walls. We design for the view without weakening the frame, and we handle the permit set as part of the written price. Room Addition Contractor in Chino Hills shows what to expect.
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 with the ADU product lines that fit Chino Hills lots: Cover, Dvele, and Boxabl each have strengths depending on your slope, access, and timeline. We keep common components available and handle warranty coordination ourselves. See our brands for what each one does well.
Pricing for ADU Company in Chino Hills, CA
These are the ranges we quote most often in Chino Hills. Hillside lots and older garages push toward the upper end; flat yards and simple conversions come in lower.
| Service | Typical range in Chino Hills |
|---|---|
| Detached ADU (prefab, 400 – 600 sq ft) | $180,000 – $320,000 before site work |
| Detached ADU (site-built, 600 – 800 sq ft) | $220,000 – $380,000 before site work |
| Garage conversion ADU | $120,000 – $210,000 |
| Home addition (attached, 300 – 500 sq ft) | $140,000 – $260,000 |
| Room addition (single room, 150 – 250 sq ft) | $70,000 – $140,000 |
| Site prep, grading, and drainage | $12,000 – $40,000 |
| Foundation and slab work | $15,000 – $50,000 |
| Electrical subpanel and wiring | $4,000 – $12,000 |
| Plumbing rough-in and fixtures | $6,000 – $18,000 |
| Insulation and drywall (conversion) | $8,000 – $20,000 |
| Permit fees and plan set | $4,000 – $12,000 |
| Exterior hardscape and access path | $8,000 – $28,000 |
What pushes a Chino Hills price up is the slope. Retaining walls, extra grading, and pier foundations are the three biggest cost drivers we see here. What doesn’t change is the way we quote: the written price covers the scope we agreed on, and if the soil report changes the plan, we tell you before anything is signed, not after.
Neighborhoods We Serve in Chino Hills
We work across the whole city, from the tract homes along Pipeline Avenue to the larger lots off Butterfield Ranch Road. Our scheduling team coordinates from the Inland Empire office, and crews are typically on site in Chino Hills within a few days of your site visit.
- Butterfield Ranch
- Los Serranos
- Carbon Canyon
- Western Hills
- Village Oaks
Service Area – Cities Near Chino Hills
If your property is close to the Chino Hills line, we may already be in your area. We also serve Pomona, CA to the west, Diamond Bar, CA to the northwest, Chino, CA to the southwest, and Montclair, CA to the north. Same written pricing, same 365-Day Done Right Promise.
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
We prepare the full permit set for City of Chino Hills review and we’ll walk the HOA submittal with you if your tract has design review. The permit fees are listed separately in your written estimate. Call (472) 248-8213 to go over your specific neighborhood’s process.
After your signed written estimate, most Chino Hills projects start within two to four weeks. Hillside lots with soils reports and HOA review can add time. We’ll give you a start window in writing before you commit.
Often yes, using a pier-and-beam foundation or a step-down design that follows the slope instead of fighting it. That approach usually costs less than cutting and rebuilding the slope. Call (472) 248-8213 for a free site walk and we’ll tell you which route fits your yard.
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
"Itemized estimate with allowances laid out. Final cost was within a hair of the quote."
- Naomi R."Backyard ADU for my mother. The project manager showed ID and walked me through the permit steps, the foundation plan, and the schedule. Moved her in on time."
- Margaret C."Insulated the walls and ceiling properly. It stays comfortable even in July."
- Tamika W.
