Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Fast, Reliable General Contractor Across Ontario
A full home remodel in Ontario doesn’t have to turn into a second job. Most of our clients in Ontario call us after a previous contractor went quiet or a price changed after demo day. We answer with a written price before any work starts, an arrival window we actually keep, and a 365-day written guarantee on every project. Call us at (341) 895-1170 and you’ll get Trevor Nash or a real person on the line, not a voicemail maze.
Why Penhallow Remodeling Riverside Is Ontario’s Preferred General Contractor Company
We’ve worked enough jobs in Ontario to know the city block by block. The bungalows near Euclid Avenue, the mid-century ranchers south of the 10, the newer townhomes pushing north toward the foothills. A General Contractor working in this city has to understand slab foundations, stucco exteriors, and the permitting quirks that come with an older housing stock. That’s the work we do every week.
Our crews arrive in uniform, background-checked, and on a schedule we put in writing. We coordinate from our Inland Empire office, so scheduling for Ontario jobs doesn’t sit in a queue with three other counties. When you call, you’ll speak with a person who can tell you exactly when we’ll be there and what the first visit will include.
Trevor Nash runs the Ontario projects personally. He’s the one who walks your lot, explains what your foundation can handle, and writes the number you’ll hold us to. The Kingswell Guarantee, the standard we’ve worked under since 2004, requires a written price, a clean job site, and a written promise on every job. No verbal ballparks. No day-of surprises.
Styles & brands we work with
General Contractor Services in Ontario
General Contractor Services in Ontario mean kitchen remodels, bathroom remodels, and whole-home renovations across a city where the housing stock was largely built between 1950 and 1985. A typical kitchen remodel here runs $14,000 to $45,000 depending on layout, cabinet line, and countertop material. A bathroom remodel falls between $9,000 and $28,000. If you’re adding square footage, a home addition in Ontario runs $45,000 to $130,000.
Here’s what that means on the ground in Ontario:
Seismic Retrofit and Foundation Bolting
Older Ontario homes, especially the pre-1970 unreinforced masonry structures along Euclid Avenue and the historic downtown core, often need foundation bolting and shear wall upgrades before any cosmetic remodel makes sense. We pull the permits, bring in the structural engineer, and handle the retrofit scope alongside your remodel so you’re not paying for the same wall to be opened twice.
Whole-Home Renovation Management
We run the entire job: plumbing, electrical, framing, tile, cabinetry, countertops, and final inspection. On a tight Ontario lot, that means staging materials on the driveway, scheduling concrete pours before the afternoon heat, and coordinating with the city on work-hour rules. You get one point of contact and one written price for the whole scope.
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
As a construction company working throughout Ontario, we handle room additions, ADU construction, and larger structural work. An ADU in Ontario runs $90,000 to $220,000. A garage conversion typically falls between $30,000 and $80,000. These are not small numbers, which is exactly why the price needs to be in writing before we break ground.
Room Additions and ADUs
Ontario’s northern and eastern expansion areas have seen steady single-family and townhome growth, and many homeowners are adding ADUs rather than moving. We handle the Title 24 energy calculations, the seismic requirements, the drainage plan, and the permit set. You see the full written scope before the first delivery of Quikrete or lumber shows up on your street.
Bathroom and Kitchen Rough-In on Older Slabs
Ontario’s hard water corrodes galvanized plumbing. On a compact lot near downtown, our crew led a full rough-in for a 1950s stucco home whose original galvanized lines had failed. We scheduled the concrete pour before 10 a.m. to avoid the 100°F afternoon heat, staged materials on the driveway with a pre-approved parking plan, and handled permits and party-wall notices so the neighbor’s shared wall stayed untouched until inspection sign-off. That’s what a tight-lot job in Ontario actually looks like.
Trusted Brands We Service in Ontario
We install materials from brands that carry their own warranties, so the protection behind our work is layered. KraftMaid and Wellborn cabinetry, Cambria and Silestone countertops, Kohler and Moen fixtures, James Hardie siding. For exterior hardscape and concrete work, we also work with Techo-Bloc and Oldcastle products. We stock common materials and parts for Ontario customers, which shortens turnaround when you need a specific tile or cabinet pull matched mid-project.
Common General Contractor Problems We See in Ontario Homes
- Galvanized plumbing that’s been eaten by hard water. Homes built from the 1950s through the 1980s in Ontario frequently have original galvanized supply lines that are rusted from the inside out. We often replace them during a kitchen or bathroom remodel before they fail inside a wall.
- Unreinforced masonry on pre-1970 homes. The historic core along Euclid Avenue has buildings that were never tied to their foundations. Seismic bolting isn’t optional here, and a contractor who skips it is leaving you with a dangerous, non-compliant remodel.
- Slab foundation movement from Ontario’s clay-heavy soil. Hot, dry summers pull moisture from the ground, and clay soil can shift. We check for slab cracks and leveling needs before we set cabinets, so your kitchen isn’t out of square in three years.
- Improper drainage on flat lots. Ontario’s occasional heavy winter rain events will find the low spot in your yard or the seam in your foundation. We address drainage and moisture barriers as part of any addition or whole-home remodel, not as an afterthought.
See the difference
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After
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Before
AfterPricing for General Contractor in Ontario, CA
Here are the numbers we quote most often in Ontario:
| Project | Typical Ontario Range |
|---|---|
| Kitchen Remodel | $14,000 – $45,000 |
| Bathroom Remodel | $9,000 – $28,000 |
| Home Addition | $45,000 – $130,000 |
| ADU Construction | $90,000 – $220,000 |
What drives the number up or down in Ontario? Foundation condition, whether the home needs seismic retrofit work, the cabinet line and countertop material you choose, and site access. A compact lot with no street parking means more time on material staging, and that shows up in the quote honestly. We’ll walk the job with you and put the full written price in your hand. Call (341) 895-1170 to schedule that first visit. Estimates are free.
We Also Serve Cities Near Ontario
Our crews cover Ontario and the surrounding Inland Empire communities. If you’re in Claremont, Chino Hills, Mira Loma, or Riverside, the same written-price process and 365-day guarantee apply. Call us and we’ll schedule a walkthrough at your property, wherever it sits in the region.
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
Yes. Pre-1970 unreinforced masonry or lightly reinforced buildings in Ontario’s historic core require a structural retrofit plan, foundation bolting details, and a city permit before work begins. We handle the engineering and the permit set as part of the remodel, and we don’t open walls until the city signs off. Call (341) 895-1170 and we’ll tell you what your specific house needs.
Ontario enforces construction noise limits and fixed work-hour windows, and on a tight lot with close neighbors, those rules matter more. We schedule loud work, like concrete cutting or framing, inside the allowed hours and let your neighbors know what’s coming. That keeps the job moving without a stop-work complaint. For an exact timeline on your street, call us at (341) 895-1170.
Yes. Shared-wall work in Ontario’s older condo and apartment complexes requires coordination with the HOA, party-wall notice to the adjacent unit, and often a separate set of permits. We handle that paperwork and keep work contained so your neighbor’s unit isn’t disturbed beyond what’s unavoidable.
We figure out material delivery windows and a staging plan before the job starts. On compact lots we often stage materials on the driveway or arrange a short-term street parking permit with the city. The access plan is part of the quote, so you know exactly how the crew will operate before we arrive.
California’s Title 24 energy code applies to Ontario remodels that touch more than a certain percentage of a home’s envelope or systems. It sets insulation, window, lighting, and HVAC efficiency standards that we build into the plan from day one, so your final inspection passes without a costly correction. Call (341) 895-1170 for a written breakdown of what your project will need.
Get Your Ontario General Contractor Quote in Writing
If you’re planning a remodel in Ontario, start with a written number, not a verbal guess. We’ll walk your property, check the foundation, the plumbing, the access, and the permit requirements, and hand you a written scope and price before any work begins. Call (341) 895-1170 to schedule your free estimate.
Written by Trevor Nash, Owner at Penhallow Remodeling Riverside, serving Ontario and the Inland Empire under the Kingswell standard since 2004.
