Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Before
After
Before
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Before
AfterRoofers in Ontario, CA
Roofing in Ontario, CA means working with inland heat, Santa Ana wind, and a housing stock full of 1950s-to-1970s tract homes whose original roofs are now past their expected lifespan. We’re Brennan Roofing, and we work under The Garrison Standard: a written price before any work starts, background-checked uniformed technicians, and a 365-Day Done Right Promise in writing on every job. If you’re looking for roofers in Ontario who put the numbers on paper before touching your roof, call (361) 320-9467.
Why Ontario Homes Are Different
Most Ontario homes were built as post-WWII tract housing, and that shapes nearly every roofing decision here. Original wood shake roofs and early asphalt shingles from the 1950s through the 1970s are now at or beyond their lifespan. Many of these houses sit on original 1×6 skip sheathing, which does not meet current code for re-roofing. That means a full redeck with plywood is often required before new underlayment and shingles go down. We see this constantly in the older tracts near the 60 Freeway corridor.
Ontario’s hot semi-arid climate punishes roofing materials. Summer temperatures routinely pass 100°F, and intense UV exposure accelerates shingle deterioration faster than most homeowners expect. Santa Ana winds add another layer. Gusts at 60 mph or higher create uplift forces that strip poorly fastened shingles. That’s why wind-rated materials and enhanced fastening patterns matter here, not just on paper but in practice. If a roof isn’t rated for the wind load Ontario actually gets, the manufacturer warranty can be void before the first Santa Ana event of the season. We specify materials accordingly.
Attic ventilation is another Ontario-specific issue. Many of these mid-century homes have minimal attic insulation and outdated venting designs. A re-roof without proper ventilation will bake shingles from underneath and shorten the roof’s life. That’s baked into our material choices and our written scope of work.
Our Main Ontario Services
Ontario homeowners call us most often for full roof replacement and for repair work tied to wind damage or age-related leaks. Each service has its own page with the detail that matters for this city.
Roofing Company in Ontario
Full roof installation and replacement in Ontario starts with an honest look at what’s under the existing roof: decking condition, ventilation, and flashing. Many older tract homes still have wood shake over skip sheathing, which means the job often includes a full redeck before new materials go on. We install GAF, CertainTeed, Owens Corning, and other leading lines, with cool-roof options that make a measurable difference in Ontario’s summer heat. See Roofing Company in Ontario for the full scope.
Roof Repair in Ontario
Repair calls in Ontario tend to spike after Santa Ana wind events, especially in the neighborhoods south of the 10 and near the 60. Shingle blow-off, lifted flashing, and leaks around penetrations are the usual culprits. The right repair depends on roof age and whether the original decking is sound. Our repair work carries the same written guarantee as a full replacement, and we come back at no charge if it fails within the year. See Roof Repair in Ontario for pricing and scope.
Roof Inspection in Ontario
A roof inspection in Ontario should account for what the climate does to roofing here: UV degradation, wind uplift, and heat-driven shingle curling. We document the condition of decking, underlayment, flashing, and ventilation, then put findings in writing with photos. Homeowners buying or selling a mid-century tract home often need this before escrow closes. See Roof Inspection in Ontario for what an inspection covers.
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.
Brands We Service in Ontario
We install and service roofing from GAF, CertainTeed, Owens Corning, Atlas, and Tamko. Most materials are stocked locally, so typical Ontario jobs don’t wait on regional supply delays. See our brands for a full comparison of what each line offers.
Pricing for Roofers in Ontario, CA
The ranges below reflect what we see on typical Ontario jobs. Your written quote will be exact, based on your roof’s condition and the scope we agree on.
| Service | Typical range in Ontario |
|---|---|
| Roof inspection | $99 – $350 |
| Minor roof repair (loose shingles, small flashing leak) | $250 – $650 |
| Moderate roof repair (vent boot replacement, valley flashing, small decking patch) | $650 – $1,900 |
| Major structural repair (decking replacement, truss work, large leak) | $1,900 – $5,300 |
| Full roof replacement (asphalt shingle, standard tract home) | $12,000 – $28,000 |
| Per-square replacement cost (tear-off and re-install) | $450 – $800 per square |
| Decking/redewing over skip sheathing (per sheet, if needed) | $65 – $130 per sheet |
| Attic ventilation upgrade (ridge vent, intake venting) | $500 – $2,000 |
What pushes a bid higher in Ontario is usually the decking. Mid-century wood shake roofs over 1×6 skip sheathing need a full redeck before new materials go down, and that’s a line-item cost, not a surprise later. Our written price goes on paper before any work starts, and it does not move at the door.
Neighborhoods We Serve in Ontario
We work across Ontario, from the older tracts near the 60 Freeway corridor to the newer subdivisions east of the 15. Most scheduling runs through our Inland Empire office, with crews dispatched locally to keep response times short.
- Central Ontario
- South Ontario
- East Ontario
- Archibald Ranch
- Edenglen
Service Area – Cities Near Ontario
We also serve homeowners in the surrounding Inland Empire cities. If you’re in a neighboring community, see the pages for Montclair, CA, Claremont, CA, Upland, CA, and Rancho Cucamonga, CA for local detail. Ontario scheduling runs through the same office, so the standard doesn’t change crossing 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 Roofers in Ontario
Inspection scheduling in Ontario is typically within a few business days, depending on current call volume. If you have an active leak or wind damage after a Santa Ana event, tell the person who answers the phone, because that changes how we route the call. We answer live, around the clock, no voicemail. Call (361) 320-9467.
Ontario requires permits for full roof replacements, and most re-roofs also need an inspection. We confirm the permit requirements with the city before work starts and make sure the job passes before we call it complete. That’s part of the written scope of work.
Many Ontario HOAs have rules about roofing materials, especially in the planned communities east of the 15. Before you sign for a new roof, check your HOA’s architectural guidelines. We can install whatever material your HOA approves, and we’ll note the HOA requirement in the written agreement before work begins. Call (361) 320-9467 for a free estimate on the roof you’re planning.
What happens when you call
- 1A real person answersNo phone trees - talk to a local roofing 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
"Quality work and clear communication. Rain pushed the start by two days, which is fair, but we were hoping to be done sooner."
- Cathy N."Storm took off a section of shingles. They were here next morning to tarp it and finished the repair that week."
- Elaine D."Ridge vent added and the attic is cooler. Fair price compared to the other two quotes."
- Vernon C.