Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Fast, Reliable General Contractor Across Ontario
If you own a home in Ontario, CA and you’re planning a kitchen remodel, bathroom overhaul, or room addition, you’re not really looking for a contractor. You’re looking for someone who will tell you the truth about what your house can handle before demolition starts. Mason Remodeling has been that company for Ontario homeowners since 2004. We scope the work properly, put every price in writing before a tool is unpacked, and back the finished job for a full 365 days. Call (803) 680-2547 and talk to a real person, right now, about what you want to build.
Why Mason Remodeling Is Ontario’s Preferred General Contractor Company
Ontario homeowners tell us the same thing again and again: they’ve had bids that looked great until the first wall came open, and then the price went somewhere else entirely. That doesn’t happen with us, because we price against the actual construction of your house, not a photo. A 1957 bungalow off Euclid Avenue and a 2005 two-story near Ontario Ranch are different animals, and any General Contractor who quotes them the same number isn’t doing you any favors.
Our reputation in Ontario rests on one habit: we write a scope of work so specific that you can hand it to another builder and they’d know exactly what we intended to do. Every crew member who walks through your door is identity-verified under the Threshold Standard, which means you’ll receive their name and photo before they arrive, and they’ll show a photo ID badge when you open the door. That matters when you’re letting someone into your home for six weeks.
Isaac Pruett, who leads our Ontario work, insists on one rule above all: if the price isn’t in writing before work starts, the job doesn’t start. That’s not a selling point. That’s the only way we know to keep a remodel from becoming a fight.
Styles & brands we work with
Construction Company in Ontario
A construction company in Ontario handles the structural, permitted, and code-driven parts of a project: additions, garage conversions, ADUs, and any remodel that moves walls, cuts into framing, or touches electrical and plumbing. In Ontario, the scope of that work depends heavily on the age of the house. Pre-1960 homes near downtown and Euclid Avenue often carry original galvanized supply lines and 100-amp electrical panels, which means a “simple” kitchen update can quietly turn into a repipe and a panel upgrade once the inspector gets involved. Newer homes north of the 60 freeway, built after Ontario Ranch took off, were framed and wired under post-1978 code and require far less corrective work before finishes go in. A home addition in Ontario generally runs $45,000 to $130,000. A garage conversion typically lands between $30,000 and $80,000, and ADU construction runs $90,000 to $220,000 depending on footprint and site work.
Permits and Inspections
The City of Ontario requires building permits for any structural change, and plumbing and electrical work must pass rough-in inspection before walls close. We pull the permits, schedule the inspections, and stand on-site for every sign-off. Skipping that step to save time is how people end up opening finished drywall to show an inspector what they should have seen weeks earlier.
Change Orders Only When Necessary
We scoped a kitchen and bathroom remodel on a 1957 tract house off Euclid Avenue where the original galvanized supply lines, a 100-amp panel, and a 1×6 plank subfloor under the tile drove the real cost far past the homeowner’s cosmetic wish list. We wrote the scope with allowances for KraftMaid cabinetry and Silestone counters, pulled permits through the City of Ontario, and the rough-in inspection sign-off forced a single change order to replace the branch wiring before the walls closed. One change order, clearly explained, in writing, before we spent a dollar on it. That’s how it’s supposed to work.
Remodeling Contractor in Ontario
A remodeling contractor in Ontario focuses on the interior transformations homeowners actually feel every day: kitchens, bathrooms, floors, and the cosmetic layers that make a house feel new again. The cost question is always the first one, so here are honest numbers. A full kitchen remodel in Ontario runs $14,000 to $45,000, depending on cabinet grade, countertop material, and how much of the rough plumbing and electrical needs correction. A bathroom remodel falls between $9,000 and $28,000. Walk-in shower installations run $4,500 to $12,000, and cabinet installation alone is $4,000 to $13,000. Countertops run $2,000 to $6,500.
Written Allowances That Match Reality
One of the most common ways an Ontario remodel goes sideways is an allowance set so low it guarantees a fight later. A $4,000 cabinetry allowance only covers stock boxes; if you pick KraftMaid semi-custom, which most people do once they see the options, the gap shows up mid-job as a surprise. We set allowances at real numbers based on the product grade you tell us you want, so the written price you sign is the price you pay.
What Gets Replaced When Walls Open
On pre-1960 Ontario homes, we routinely find the same three surprises: galvanized supply lines that are nearly closed with corrosion, 100-amp panels that cannot carry a new appliance circuit, and plank subfloors that flex under tile. None of these are visible from photos. A contractor who prices without opening a wall is pricing fiction. We will open the wall as part of the scoping, if needed, so the number you sign is built on what’s actually inside your house.
Trusted Brands We Service in Ontario
Ontario homeowners should not have to cross-reference ten different showrooms to know what they’re buying. We work directly with specification-grade product lines across the categories that matter: KraftMaid cabinetry, Silestone and Caesarstone countertops, Kohler and Moen fixtures, and Belgard hardscape materials. When you see these brands on your written scope, you know exactly what’s going into your home. And because we order from those manufacturers regularly for our Ontario projects, lead times and availability are things we can actually predict, not guess at.
See the difference
Before
After
Before
After
Before
AfterCommon General Contractor Problems We See in Ontario Homes
- Galvanized plumbing in pre-1960 tract homes. The original supply lines in houses around Euclid Avenue and downtown Ontario are often so corroded inside that a new fixture install becomes a repipe the moment you touch the connection. We flag this during scoping, not after demo.
- 100-amp electrical panels on older stock. A modern kitchen with an induction range, under-cabinet lighting, and a microwave pulls more than a 1957-era panel was ever designed for. The fix is a panel upgrade, not an extension cord.
- Undersized allowances on cabinetry and counters. We covered this above, but it deserves repeating: the $4,000 allowance is the most common way a bid looks cheaper than the job actually is. Pick your products before you sign.
- Skipping permits to hit a deadline. The City of Ontario inspection office will not sign off on work it cannot see. When rough-in inspection fails because the work wasn’t pulled properly, you’re opening finished walls. We pull every permit up front.
Pricing for General Contractor in Ontario, CA
The cost of your project in Ontario is driven by three things: the age of your home, the grade of your finishes, and whether the work touches structural or mechanical systems. Here are the ranges we quote from, for Ontario specifically:
| Project | Ontario Price Range |
|---|---|
| Kitchen Remodel | $14,000 – $45,000 |
| Bathroom Remodel | $9,000 – $28,000 |
| Cabinet Installation | $4,000 – $13,000 |
| Countertop Installation | $2,000 – $6,500 |
| Walk-In Shower Installation | $4,500 – $12,000 |
| Home Addition | $45,000 – $130,000 |
| ADU Construction | $90,000 – $220,000 |
Every estimate we give in Ontario is free, written, and specific to your house. No verbal numbers, no “we’ll figure it out as we go.” Call (803) 680-2547 and we will come out, look at what you have, and tell you what it will actually cost.
We Also Serve Cities Near Ontario
Our crews live and work throughout the western Inland Empire. Along with Ontario itself, we regularly take on projects in Montclair, Claremont, Upland, and Rancho Cucamonga. If you’re a few minutes up Euclid or over the 10 in either direction, the same written-pricing and crew-verification standards apply.
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
No. A kitchen remodel quote on a pre-1960 Ontario home cannot be real without opening at least one wall to check plumbing, wiring, and subfloor condition. A photo cannot show galvanized pipe corrosion or a 100-amp panel that needs upgrade. The number you get over the phone is a starting point, not a contract. We will open a wall if needed and give you a number that holds. Call (803) 680-2547 to get an actual scope on paper.
A permitted kitchen remodel in Ontario usually runs six to ten weeks from first demo to final inspection. A bathroom runs four to six weeks. The City of Ontario inspection schedule is the biggest variable, and rough-in sign-off typically adds a week between phases. We schedule inspections as early as the code allows and do not close walls until they pass.
On older Ontario homes, the three repeat offenders are galvanized plumbing replacement, 100-amp panel upgrades, and subfloor repair under tile. On newer homes, it’s almost always a low allowance on cabinetry or countertops that forced a mid-job upcharge. We price against actual conditions and set allowances at real product grades, so the written price holds. For an exact quote on your home, call (803) 680-2547.
Yes, if the work touches structure, plumbing, or electrical. Cosmetic work like painting and flooring does not require a permit, but any kitchen or bathroom remodel that moves plumbing or opens walls does. The City of Ontario requires rough-in inspection before walls close, and unpermitted work at resale is a liability you do not want. We handle permits on every job.
The walkthrough happens after we complete the final punch list. We walk the entire project together, note anything that’s off, and we do not collect your final payment until those items are corrected. Our 365-Day Done Right Promise covers the work for a full year from the completion date: if anything fails, we return free of charge. Call (803) 680-2547 to start with a free estimate.
Written by Isaac Pruett, Owner at Mason Remodeling, serving Ontario since 2004.
