ADU Company in Ontario, CA
Kitchen remodeling in Ontario usually means reworking a 1950s or 1960s galley kitchen inside a stucco tract home where the original footprint still works but the cabinets, wiring, and layout don’t. Most jobs we handle here run between $35,000 and $85,000 depending on whether you’re keeping the existing footprint or removing a wall. The difference in Ontario is the heat: a kitchen that faces west bakes through July and August, so ventilation, window placement, and insulation get as much attention as the cabinets. We’re Guest House ADU Builders, and we’ve served Ontario since 2011. Call (833) 863-7015 for a free estimate.
Why Ontario Homes Are Different
Ontario’s core housing stock is 1950s through 1970s single-story stucco on deep lots, and that layout shapes almost every remodeling decision inside the home. The kitchens are typically compact galleys with a single window over the sink, original cast-iron drain lines, and electrical panels that were sized for an era of few appliances. When we open up an Ontario kitchen from that period, we’re almost always upgrading the panel from 100 amps and replacing galvanized supply lines before the new range and hood go in.
The climate is the second factor. Regular 100°F-plus stretches from June through September and Santa Ana wind events in the fall mean a remodeled kitchen needs a real exhaust path to the outside, range hoods sized for actual CFM rather than recirculating units, and windows that won’t turn the room into a solar oven. Poor air quality days also push homeowners toward sealed ducting and better filtration for the HVAC return, not just something that looks new. Homes in the 91761 and 91762 ZIPs tend to have the older panels and original drains; homes in 91764 and 91758 often have slightly newer mechanicals but tighter lots, which changes how far you can bump out.
Our Main Ontario Services
Two services generate most of the calls we take in Ontario: ADU construction and bathroom remodeling. Here’s how each one works in this city.
ADU Builders in Ontario
Ontario’s older neighborhoods were platted with long driveways running to detached rear garages, which makes garage-to-casita conversions the single most common ADU path here. The real work starts with checking whether that original 1950s garage slab and panel can carry a habitable unit, and many can’t without a new foundation edge and a service upgrade. We handle that evaluation, the permit path, and the build, matching you to the right prefab system rather than pushing one brand. ADU Builders in Ontario covers the full process, from lot checks to punch-list.
Bathroom Remodeling in Ontario
Bathrooms in Ontario’s mid-century homes are small, often 5 by 8 feet with a single vanity and tile set directly over drywall, which means water damage behind the walls is common. The hot, dry climate doesn’t save them because the failures happen at the tub surround and the wax ring, not the exterior. A bathroom remodel here usually means a full gut to the studs, waterproofing done to current code, and moving the vent fan to a true exterior exhaust. Bathroom Remodeling in Ontario breaks down the costs and the typical timeline.
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
Kitchen remodeling in Ontario tends to follow one pattern: the house is solid, the lot is wide, and the kitchen is the original galley layout with 30-year-old cabinets and an electric range that hasn’t moved since the house was built. The work isn’t about making the kitchen bigger so much as making it functional for how people actually cook now, and doing it without letting the west-facing afternoon heat turn the room into the hottest spot in the house. Remodeling the kitchen is often the first phase before an ADU goes into the backyard, because a homeowner who’s about to carry two dwellings on one lot wants the main house working properly first. If you’re weighing kitchen work alongside an ADU, read Kitchen Remodeling for the full scope of what we offer.
Cabinet Replacement and Layout Rework
Signs you need it
Drawer fronts are delaminating, the corner lazy Susan is seized, and you’ve been working around the same blind corner for years.
What it costs in Ontario
Semi-custom cabinet replacement with a modest layout adjustment runs $12,000 to $22,000 in Ontario; full custom with an island starts around $30,000.
How we do it
We measure the existing footprint, adjust the layout on paper first, pull the old boxes, and set the new cabinets level on scribed bases before countertops are templated.
Full Gut with Countertops and Appliances
Signs you need it
The counters are cracked tile, the appliances are mismatched and failing, and the wiring can’t support a modern induction range or a proper vent hood.
What it costs in Ontario
A full kitchen gut with new appliances, counters, and moving one wall runs $35,000 to $60,000 depending on finish level and whether the panel needs upgrading.
How we do it
We strip the room to studs, replace the drain and supply lines while the walls are open, upgrade the circuits, then rebuild with new drywall, flooring, cabinets, counters, and appliances in sequence.
What Kitchen Remodeling Costs in Ontario
| Item | Typical range in Ontario |
|---|---|
| Cabinet replacement only | $12,000 – $22,000 |
| Full gut with counters and appliances | $35,000 – $60,000 |
| Panel upgrade and kitchen rewiring | $3,500 – $7,000 |
How long does a kitchen remodel take in Ontario?
Most full kitchen remodels in Ontario run six to eight weeks from demolition to final cleanup. Cabinet-only jobs without layout changes finish in about three weeks, assuming no hidden drain or framing problems show up once the walls are open.
Call (833) 863-7015 for a written timeline based on your actual kitchen, not a generic estimate.
Will the price change once work starts?
Our quotes are fixed for the scope we agree on in writing. The only changes come if we open a wall and find something that genuinely changes the structural or plumbing scope, and we walk you through any adjustment before doing the work.
Call (833) 863-7015 and we’ll price your Ontario kitchen honestly before any contract is signed.
Brands We Service in Ontario
We build ADUs with Abodu, Cover, and Dvele prefab systems, and we stock the common kitchen fixtures and finishes locally so you’re not waiting on a shipment from out of state. Most kitchen remodels in Ontario move faster when the tile, cabinets, and appliances are sourced through our supply chain rather than ordered piecemeal. See our brands for the full comparison.
Pricing for ADU Company in Ontario, CA
| Service | Typical range in Ontario |
|---|---|
| Kitchen cabinet replacement | $12,000 – $22,000 |
| Full kitchen gut with appliances | $35,000 – $60,000 |
| Kitchen electrical panel upgrade | $3,500 – $7,000 |
| ADU (attached, entry-level finish) | $175,000 – $220,000 |
| ADU (detached, mid-range finish) | $225,000 – $280,000 |
| ADU (prefab, mid-grade system) | $200,000 – $260,000 |
| ADU (higher-end prefab or site-built) | $280,000 – $380,000 |
| Garage conversion to ADU | $90,000 – $140,000 |
| Bathroom remodel (5ft x 8ft full gut) | $15,000 – $25,000 |
| Bathroom remodel (larger or higher finish) | $25,000 – $45,000 |
In Ontario, two things push kitchen and ADU pricing up: the age of the original electrical panel and the condition of garage slabs on older lots. If a 1950s panel needs replacing before the kitchen can pass inspection, that’s a real cost we price upfront and show you in the line item, not a surprise at the end.
Every quote is fixed for the agreed scope. You’ll see the full number before we start, and it doesn’t move unless you change the scope.
Neighborhoods We Serve in Ontario
We work across Ontario’s older residential pockets where 1950s and 1960s tract homes and detached garages are the rule, and we’re familiar with the permit office’s expectations for these specific layouts. Kitchen remodels and ADU consults are usually scheduled within two business days in Ontario.
- South Ontario (91761)
- Central Ontario and downtown corridor (91762)
- North Ontario and the 10 freeway adjacent neighborhoods (91758, 91764)
- Neighborhoods near the Ontario Airport and Guasti area
Service Area – Cities Near Ontario
Besides Ontario, we take kitchen remodeling and ADU projects in Montclair, CA, Upland, CA, Chino, CA, and San Antonio Heights, CA. If you’re in one of those cities and want the same Ontario-level detail on pricing and process, call us and we’ll tell you what’s different there.
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
We can usually get an estimator to your Ontario home within two business days, and we start kitchen remodels within three to four weeks once the contract is signed and materials are ordered. ADU projects depend on permit review times, which vary seasonally.
Call (833) 863-7015 to schedule the first visit, free.
Yes, any kitchen remodel in Ontario that changes the electrical, plumbing, or structural walls needs a permit, and we pull it on your behalf. Cosmetic changes like paint, cabinet refacing, or countertop replacement don’t require one.
We handle the permit for every job we do, so you’re not calling the city yourself.
Yes, and that’s one of our most common Ontario projects. We coordinate the kitchen remodel and the ADU so the disruption happens once, the permit reviews run in parallel, and the pricing is easier to see as one job instead of two separate contracts.
Call (833) 863-7015 and ask for a combined scope and quote.
Call Guest House ADU Builders at (833) 863-7015 for a free kitchen remodeling or ADU estimate in Ontario. We’ll walk your lot, look at your panel and slab, and give you a fixed price before any work starts.
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
"He gave us a realistic rental number for the finished unit rather than the optimistic one, and it's renting for about what he said."
— David Nguyen"Knew the local setback and parking rules cold, which saved us from designing something that would never have been approved."
— Yolanda Morales"The kitchenette layout he suggested made better use of the space than the one on our original sketch."
— Adriana Garcia