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
Fielding ADU Builders handles accessory dwelling units, garage conversions, and room additions in Chino Hills with a written price before any work starts and a one-year written guarantee on every project. Chino Hills lots sit against the Chino Hills State Park foothills, so grading, drainage, and hillside setback rules shape more ADU decisions here than in flatter Inland Empire cities. If you’re weighing a detached unit, a garage conversion, or an addition, call (361) 315-4177 and we’ll walk the property with you before you commit to anything.
Why Chino Hills Homes Are Different
Chino Hills housing stock runs from 1980s and 1990s tract homes in neighborhoods like Butterfield Ranch and Los Serranos to larger custom and semi-custom builds along the northern edge near Soquel Canyon and the 71. Older tracts tend to have consistent lot dimensions, which makes garage conversions and attached additions more predictable. Hillside and ridge-adjacent lots are a different animal: steeper grades mean retaining walls, stepped foundations, and extra soils work that flat-lot ADUs never see.
Climate matters here too. Chino Hills gets hot, dry summers with sustained heat in the 90s and occasional 100-plus stretches, so insulation and HVAC sizing are not optional add-ons. We also watch the Santa Ana wind pattern in fall, which affects exterior work sequencing and a few permit details around structural anchoring. Some neighborhoods carry HOA review requirements that layer extra approval time over the city’s ADU permitting, and we tell homeowners that up front, in writing, before they spend a dollar.
Our Main Chino Hills Services
Most Chino Hills homeowners call us about one of three projects. Each has its own page with Chino Hills-specific pricing, process, and answers.
Room Addition Contractor in Chino Hills
Room additions in Chino Hills often mean extending an existing slab foundation, tying into the roofline, and matching stucco or siding on homes built 20 to 40 years ago. We handle setbacks, plan submittal, and the structural engineering that hillside and view-lot additions require. The written quote covers foundation, framing, electrical, HVAC tie-ins, drywall, and finish work before we mobilize a single crew member. Room Addition Contractor in Chino Hills
Garage Conversion Contractor in Chino Hills
A garage conversion in Chino Hills typically means converting an attached two-car garage into a permitted living space, which changes the project’s electrical panel needs, insulation requirements, and egress windows. The city’s permit path is well-defined, but HOA communities can add their own review steps, and we pull those into the schedule from day one. Pricing is fixed in writing before work begins. Garage Conversion Contractor in Chino Hills
ADU Builders in Chino Hills
Detached ADUs in Chino Hills range from compact studio units under 500 square feet to two-bedroom units near the city’s accessory dwelling unit maximums. We work through the site constraints that affect cost here: slope, soil, utility runs, and required fire-rated separation from the main house. Whether you want a conventional build or a prefab unit from a platform like Cover or Dvele, the price goes in writing before you approve it. ADU Builders in Chino 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 Chino Hills
We install and finish ADUs from Cover, Dvele, and Boxabl, and we work with James Hardie siding on conventional builds. Fasteners, flashing, trim, and finish materials are stocked at our Inland Empire warehouse, so we don’t lose schedule days waiting on small parts. See our brands for the full list.
Pricing for ADU Company in Chino Hills, CA
| Service | Typical range in Chino Hills |
|---|---|
| Detached ADU (400 – 600 sq ft) | $185,000 – $240,000 |
| Detached ADU (600 – 800 sq ft) | $240,000 – $320,000 |
| Detached ADU (800 – 1,000 sq ft) | $320,000 – $410,000 |
| Garage conversion (attached, 400 – 500 sq ft) | $95,000 – $150,000 |
| Garage conversion (detached) | $120,000 – $190,000 |
| Room addition (200 – 400 sq ft) | $110,000 – $175,000 |
| Room addition (400 – 600 sq ft) | $175,000 – $260,000 |
| Junior ADU (interior conversion, under 500 sq ft) | $85,000 – $130,000 |
Hillside lots, retaining-wall work, long utility trenching, and HOA-required design review push Chino Hills jobs toward the upper end of these ranges. Your quote is fixed before we start, and the number you approve is the number on the final invoice.
Neighborhoods We Serve in Chino Hills
We work across Chino Hills, from the older established tracts to the newer hillside communities. Our crews are in the area most weeks, so scheduling a walkthrough is usually a matter of days, not weeks.
- Butterfield Ranch
- Los Serranos
- Soquel Canyon
- Vila Borba
- Oak Ridge
Service Area – Cities Near Chino Hills
In addition to Chino Hills, our crews serve homeowners in the surrounding Inland Empire communities. If your property sits close to a city line, we’ll confirm service coverage when you call. Nearby cities we cover include Pomona, CA, Diamond Bar, CA, Chino, CA, and Montclair, CA.
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
Most Chino Hills walkthroughs happen within a few days of your call. Scheduling runs through our Inland Empire office, and crews are in Chino Hills regularly. Call (361) 315-4177 and we’ll find a time that works.
They can. Some Chino Hills HOA communities require their own design review before the city will issue permits. We identify whether that applies to your neighborhood during the first conversation, and we factor review time into the schedule we give you rather than discovering it mid-project.
No. Fielding ADU Builders puts the price in writing before any work begins. The number you approve is the number on the final invoice. If site conditions surface something beyond the written scope, we document it and get your written approval before proceeding. Call (361) 315-4177 for a free estimate.
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
"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.
