Kitchen remodeling
Bathroom remodeling
Home additions & ADU
Roofing
Windows & doors
Driveway & pavers
FenceFree written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Fast, Reliable General Contractor Across Ontario
Hiring a General Contractor in Ontario means finding a team that understands the city’s split personality: the newer master-planned subdivisions around 91761 that run on Title 24 energy and seismic code, and the postwar slab-foundation tract homes through 91762 and 91764 that need real structural attention. We’re San Mateo Construction, led by Noel Carrington, and we handle both worlds under one contract. From kitchens and baths to roofs, windows, and full ADU builds, we manage the permits, the HOA paperwork, and the crews so you don’t have to. Call (855) 901-7266 for a free estimate, and we’ll walk the project with you before a single number goes on paper.
Why San Mateo Construction Is Ontario’s Preferred General Contractor Company
Our work in Ontario runs the full span of what this city actually builds. We’ve pulled cabinet permits on newer streets near 91761 where the HOA wanted architectural review before demo even started. We’ve re-roofed 1960s stucco ranchers in 91762 where the original skip-sheathing had never been touched. That range matters because a contractor who only does new construction will fight an old slab house, and a remodeler who’s never cleared a builder warranty will quietly void yours.
What Ontario homeowners tell us is they want one name on the contract and one person making decisions. Noel Carrington runs our projects that way. We carry the licensing and insurance Ontario requires, we pull permits in the city and the county, and we don’t pass change orders to you unless we’ve walked the scope first, in writing, with a line-item price attached.
Our Ontario customers talk about two things in reviews: that we showed up when we said we would, and that the allowances matched the final invoice. That’s not an accident. It’s how we quote.
Styles & brands we work with
General Contractor Services in Ontario
General Contractor Services in Ontario means something very specific on the newer 91761 master-planned streets: the work has to clear HOA architectural review and protect the builder warranty, or the job goes sideways before the first cabinet comes out. We handle that from day one. Whether it’s a kitchen remodel, a full bath replacement, or a room addition, our scope covers the rough-in, the finishes, and the paperwork between.
Kitchen and Bath Upgrades in Newer Ontario Homes
Builder-grade kitchens in Ontario’s newer subdivisions are usually functional but thin: thermofoil cabinet doors, laminate counters, a backsplash that was never sealed properly around the cooktop. Replacing those with KraftMaid cabinets and a Cambria or Silestone island changes how the whole house lives. A kitchen remodel in Ontario runs $14,000 – $45,000 depending on whether we are keeping the layout or moving the sink line.
Roof and Exterior Scope
Ontario’s high-desert sun and Santa Ana winds chew up roofing faster than most Southern California homeowners expect. We install GAF, CertainTeed, and Owens Corning roof systems with proper underlayment and edge detail for the wind uplift this city sees. A roof replacement in Ontario runs $8,000 – $20,000. A standard re-roof on a 1,600-square-foot tract home usually lands in the middle of that range.
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.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Construction Company in Ontario
A Construction Company in Ontario is only as good as its ability to work inside the city’s two very different code environments. The postwar slabs of 91762 and 91764 need seismic anchors, newer windows, and re-roofs to meet current standards. The newer homes near 91761 need someone who will not trip the builder warranty. We do both under a single license and a single point of accountability.
ADU and Addition Work
Ontario homeowners are adding ADUs at a steady pace, especially on lots with enough rear yard to keep the main house usable. We’ve built stick ADUs and we’ve installed prefab units through partners like Abodu and Mighty Buildings where the lot access made sense. An ADU in Ontario runs $90,000 – $220,000 depending on the unit size, utility trenching, and whether we are tying into the existing panel or adding a subpanel.
Whole-Home Coordination
The bigger Ontario jobs are the ones where three trades used to run past each other. We’re used to sequencing a kitchen remodel, a window swap, and a roof replacement on the same house without the homeowner losing six months to scheduling. A whole-home remodel in Ontario is usually a series of scoped phases rather than one giant gut, which is how we protect the budget and the timeline.
Trusted Brands We Service in Ontario
We carry and install the brands Ontario homeowners ask for by name, and we’ll help you pick between them with honest trade-offs. On the window side, that includes Therma-Tru entry doors, ECO Window Systems for high-efficiency vinyl, and Mr-Glass hardware. Noel Carrington believes in giving you the real comparison, not a sales pitch: ECO for budget-conscious replacements, Therma-Tru for a fiberglass door that will not warp in the Ontario heat. We keep local stock for the common sizes, so a replacement door or window does not sit on a freight truck for three weeks.
Common General Contractor Problems We See in Ontario Homes
- HOA architectural review skipped on 91761 projects. A patio cover goes up, the exterior paint changes, or a new fence goes in at the wrong height, and the association flags it after the fact. Fixing that means paying to redo finished work.
- Builder warranties voided by undocumented alterations. We see kitchens and baths where someone cut into a load-bearing wall or pulled the rough-in without a documented alteration plan. The builder warranty dies on the spot.
- Allowance mismatches on builder-grade upgrades. The cabinet, countertop, and backsplash allowances blur into one number, and the homeowner does not see the real cost until the punch list. We write allowances as separate line items.
- Heat and UV damage on original roofs and stucco. Ontario’s sun does more damage than rain. We inspect for sealant failure, cracked stucco around windows, and roof underlayment that has turned brittle years before the shingles show wear.
See the difference
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After
Before
After
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AfterPricing for General Contractor in Ontario, CA
Here’s what we quote for the work Ontario homeowners call us about most often. These are our current Ontario-market ranges, not national averages.
| Project | Ontario Market Range |
|---|---|
| Kitchen Remodel | $14,000 – $45,000 |
| Cabinet Installation | $4,000 – $13,000 |
| Countertop Installation | $2,000 – $6,500 |
| Bathroom Remodel | $9,000 – $28,000 |
| Walk-In Shower Installation | $4,500 – $12,000 |
| Roof Replacement | $8,000 – $20,000 |
What moves a number within these ranges: whether we’re working on a postwar slab home in 91762 that needs subfloor and plumbing changes before any finish goes in, or a newer 91761 build where the rough-in is already modern and the job is mostly finish work. Permit fees, HOA review, and the brand tier you select all factor in. We give a written line-item quote, not a lump sum, and the allowances are set before we start. Call (855) 901-7266 to schedule your free estimate.
We Also Serve Cities Near Ontario
Our crew runs projects in Montclair, Upland, Chino, and San Antonio Heights the same week we’re in Ontario. Most of those jobs share the same Inland Empire climate concerns and the same code environment, so there’s no learning curve when we cross a city line.
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 General Contractor in Ontario
It can, if the work touches load-bearing walls or major systems without documentation. The way to protect the warranty is to document the alteration, use licensed contractors, and sometimes pull a permit even when you’d rather not. We handle that paperwork as part of the job. If you’re in a newer 91761 subdivision, call (855) 901-7266 and we’ll tell you whether your remodel is warranty-safe before you spend a dollar.
Usually yes, if the work changes anything visible from the street or adds exterior venting, windows, or doors. Interior-only finish work typically does not trigger a review, but exterior changes like a new range hood vent or a window swap almost always do. We prepare and submit the architectural package. Call (855) 901-7266 and we’ll tell you whether your specific project needs HOA sign-off.
Upgrade cabinets and countertops first, because those see daily use and show wear earliest. A backsplash is a good second since the builder install often gets scribed poorly around the cooktop. What can wait: builder carpet in low-traffic bedrooms and interior doors, which are inexpensive to swap later. Our cabinet installs in Ontario run $4,000 – $13,000, and a countertop replacement runs $2,000 – $6,500. Call (855) 901-7266 for an exact quote.
Yes, if you’re moving plumbing, opening walls, changing the roofline, or adding square footage. A kitchen or bath that stays in the same footprint and only swaps finishes may not need one, but Ontario code enforcement is strict about unpermitted rough-in work, especially on the older 91762 and 91764 slab houses. We tell you up front whether a permit applies. Call (855) 901-7266 for a straight answer on your specific project.
We write every allowance as a separate line item: cabinets, countertops, backsplash, fixtures, tile. When you select a brand tier, that line item gets updated before work begins. Change orders only happen when the scope changes, and they come with a written price before any work proceeds. No surprises at punch list. Call (855) 901-7266 and we’ll show you exactly how a quote is structured.
Ontario’s Two Construction Worlds, One Contractor
Ontario’s newer master-planned subdivisions near 91761 sit under modern Title 24 energy and seismic code, so the builder-grade failures there trend toward fit-and-finish issues and warranty-voiding alterations rather than the foundation and stucco retrofits that dominate the postwar slabs in 91762 and 91764. A general contractor working these newer Ontario homes has to protect the builder warranty and clear HOA architectural review before touching a single finish. That’s the job.
On a newer master-planned street off the east Ontario corridor near 91761, our crew gutted a builder-grade kitchen down to the rough-in, set KraftMaid cabinets and a Cambria island, and ran every change order through the HOA’s architectural review before demo so the owner’s builder warranty stayed intact. We kept the draw schedule aligned with a mid-project inspection sign-off rather than sprinting to close, and the punch list cleared in one walk because the allowances and scope of work were in writing from day one.
If you’re in Ontario and weighing a first upgrade or a full remodel, call (855) 901-7266. We’ll look at the house, tell you what’s worth doing now and what can wait, and write a quote you can actually read.
Written by Noel Carrington, Owner at San Mateo Construction, serving Ontario and the surrounding Inland Empire.