ADU Company in Ontario, CA
Kitchen remodeling in Ontario usually runs $28,000 to $65,000 for a full renovation, with smaller refreshes starting around $15,000. Most of the kitchens we work on sit inside 1950s-1970s ranch homes where the original footprint was built for a different era, and the job often involves more than cabinets and counters. Ontario’s older housing stock means panel upgrades, sewer line checks, and structural work beneath the tile are common before finish work even begins. Call (877) 265-9846 for a free estimate on your Ontario kitchen.
Why Ontario Homes Are Different
Ontario’s housing stock skews heavily toward mid-century single-story ranch and tract homes, most built between 1955 and 1975. These homes sit on generous lots, many over 7,000 square feet, which is why detached ADU and garage conversion work has taken off here faster than in denser neighboring cities. But the age of these homes matters. Original 100-amp panels are common, and adding an ADU or a modern kitchen with induction appliances frequently means a panel upgrade before anything else. Sewer lines are another recurring issue in Ontario’s older tracts; clay pipes installed in the 1960s are at the end of their life, and we regularly replace them before building over them. The climate pushes design decisions too. Ontario summers are hot and dry, so we plan for deep roof overhangs, high-efficiency mini-splits, and reflective roofing on new ADU work. In foothill-adjacent Ontario neighborhoods, Santa Ana wind events make fire-resistant exteriors a practical consideration, not a marketing line.
The soil is the variable most people don’t see coming. Ontario sits on old alluvial fan deposits, and ground conditions shift block by block in parts of the city. Where neighboring towns can often get away with post-and-pier foundations for backyard units, many Ontario lots need an engineered slab. It’s a real cost difference, and it’s one reason we survey the lot before we recommend any ADU product or build method. In the older tracts south of Holt Boulevard and east of Euclid Avenue, we also work around mature citrus trees that original homeowners planted decades ago. Ontario’s heritage tree ordinance can require permits and replacement planting for larger specimens, which adds time and paperwork to an otherwise straightforward backyard build.
Our Main Ontario Services
Two services dominate the calls we take from Ontario homeowners: ADU construction and bathroom remodeling. Here’s what each involves in this city specifically.
ADU Builders in Ontario
Ontario’s large lots and older ranch homes make ADU construction a natural fit, but the work here has local wrinkles. Many projects involve converting an existing detached garage rather than building new, which means evaluating the slab, the electrical feed, and the sewer connection before we recommend a product. Alluvial fan soils in parts of the city often require engineered foundations, and we plan for that from the first site visit. We work with seven prefab manufacturers plus fully site-built construction, so the recommendation comes from your lot, not our inventory. ADU Builders in Ontario covers the full process from zoning check to finished interior.
Bathroom Remodeling in Ontario
Bathrooms in Ontario’s 1950s-1970s homes are almost always original or poorly updated, with cast-iron drain lines and minimal venting. A full remodel here typically means replacing the drain stack, installing proper ventilation for the inland heat, and often squaring up walls that have shifted over six decades. Our in-house crews do the full job, from demo to tile to fixture installation, without handing the project to subcontractors. Bathroom Remodeling in Ontario walks through the process and costs for your specific neighborhood.
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.
Kitchen Remodeling in Ontario
Most Ontario kitchens we open up were built between 1958 and 1972, and they were designed for a household that didn’t exist anymore: one cook, a single oven, and maybe five linear feet of counter space. Today’s Ontario households want an island, dual-fuel range space, a vent that actually moves air in an inland valley summer, and enough counter space for three people to work without colliding. Remodeling one of these kitchens is rarely cosmetic; it means panel upgrades, framing corrections, and often a full sewer line replacement underneath the floor. Kitchen Remodeling explains our in-house approach to the work.
Full Kitchen Renovation
Signs you need it
Your cabinets are delaminating at the corners, the layout puts the refrigerator in the traffic path from garage to living room, and the vent hood recirculates air instead of exhausting it, leaving a grease film on every surface in the room.
What it costs in Ontario
A full kitchen renovation in Ontario typically runs $28,000 to $65,000 depending on cabinet grade, countertop material, appliance package, and how much structural work the 1950s-70s framing requires.
How we do it
We demo to studs, replace the subfloor if the original has water damage from decades of slab moisture, correct the framing for the new layout, rough in electrical and plumbing including a dedicated circuit for the range, install cabinets and counters, and finish with our own tile and trim crews.
Cabinet Refacing and Countertop Replacement
Signs you need it
Your cabinet boxes are solid but the doors are worn, warped, or dated, and the laminate counters are chipped or burned in irreparable spots.
What it costs in Ontario
Cabinet refacing with new doors and hardware plus a new countertop usually lands between $15,000 and $24,000 in Ontario, depending on the counter material and whether we’re also replacing the sink and faucet.
How we do it
We build new doors and drawer fronts, apply veneer to the boxes, install soft-close hardware and new pulls, then swap the countertop and sink, which usually takes two weeks from start to finish.
What Kitchen Remodeling Costs in Ontario
| Item | Typical range in Ontario |
|---|---|
| Full kitchen renovation | $28,000 – $65,000 |
| Cabinet refacing and countertop replacement | $15,000 – $24,000 |
| Electrical and plumbing upgrades to support a modern kitchen | $5,000 – $15,000 |
Ontario’s older panels and clay sewer lines push the total higher than a comparable job in a newer tract. We give you a line-item quote before work starts, and the price doesn’t change unless you change the scope.
Do I need a permit for a kitchen remodel in Ontario?
Yes, if you’re moving electrical, plumbing, or walls, Ontario requires permits. We pull them, schedule inspections, and close them out as part of every job.
How long does a full kitchen remodel take in Ontario?
A full renovation takes six to ten weeks in Ontario, with cabinet fabrication being the longest lead time. Refacing jobs are usually done in two weeks.
Brands We Service in Ontario
We build with our brands including Boxabl, Plant Prefab, and Tuff Shed, and we finish ADU exteriors with James Hardie fiber-cement cladding when the site calls for fire resistance or a tougher skin against Santa Ana wind. Materials for Ontario jobs arrive from our regional suppliers, and cabinet and countertop lead times are typical at three to six weeks.
Pricing for ADU Company in Ontario, CA
| Service | Typical range in Ontario |
|---|---|
| Full kitchen renovation | $28,000 – $65,000 |
| Cabinet refacing and countertop replacement | $15,000 – $24,000 |
| Electrical and plumbing upgrades for a modern kitchen | $5,000 – $15,000 |
| Bathroom remodeling (full) | $18,000 – $45,000 |
| ADU construction (prefab, turnkey) | $180,000 – $450,000 |
| ADU construction (site-built, custom) | $250,000 – $600,000 |
| Garage conversion to ADU | $120,000 – $250,000 |
Three things push Ontario prices up most often: alluvial fan soils requiring engineered slabs, original 100-amp electrical panels that can’t handle a modern kitchen or ADU load, and clay sewer lines from the 1960s that need replacement before we frame over them. We quote a fixed price up front, and the number we give you is the number you pay.
Neighborhoods We Serve in Ontario
We work across Ontario’s ZIP codes: 91758, 91761, 91762, and 91764. The older subdivisions south of Holt Boulevard and east of Euclid Avenue are where most of the ADU and kitchen work is booked lately, but we’re active throughout the city.
- South Holt Boulevard tracts (the 1950s-60s ranch subdivisions)
- Downtown Ontario (mature citrus-tree lots, heritage tree permits)
- The Foothill-adjacent neighborhoods of 91762 and 91764
- The 91761 corridor near Ontario Mills and the I-10
Most Ontario estimates happen within three business days, and our project manager typically walks the site the same day we quote.
Service Area – Cities Near Ontario
Beyond Ontario, we serve several nearby Inland Empire cities with similar housing stock and ADU demand. Montclair, CA is a short drive west with many of the same mid-century ranch homes. Upland, CA runs north along Euclid Avenue into the foothills where fire-resistant exteriors matter more. Chino, CA is directly south with large agricultural-to-residential lots perfect for detached ADUs. San Antonio Heights, CA is a smaller hillside community we serve above Upland.
Serving Ontario, CA — Our Local Coverage Area
We’re based in the Ontario 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 Ontario
Kitchen and bathroom remodels typically begin within two to four weeks of contract signing, depending on cabinet and fixture lead times. ADU projects start after city plan check, which runs four to eight weeks in Ontario.
Most Ontario single-family homes are not in HOAs, but the 91762 and 91764 foothill tracts have a few communities with design review rules. We check for CC&Rs on your parcel as part of the estimate, and we handle HOA submittals where they apply.
Yes, we serve all Ontario ZIP codes: 91758, 91761, 91762, and 91764. Call (877) 265-9846 to confirm your address and schedule 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 Ontario Customers Say
"Garage conversion to a one bedroom unit. He handled the plans, the city submittal, and every round of corrections. Took six months from first meeting to final inspection and he never once made the permit process my problem."
— Christine Kim"Detached unit in the back yard. Utilities trenched, separate meter, and it passed final on the first inspection."
— Todd Rhodes"Unit came out great and the tenant is happy. The timeline ran long, largely because of how slow the city was on plan check, though a couple of the delays were scheduling on their end."
— Elena Torres