Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
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AfterFast, Reliable Roofing Company Across Ontario
If you need a roofing company in Ontario, start with this: a full tear-off and re-roof on a typical 1,400-square-foot mid-century tract home here costs $9,800 to $16,500, while a targeted repair runs $350 to $1,100 depending on what our crew finds once they’re on the roof. Brennan Roofing serves Ontario with a written price before any work starts, background-checked uniformed technicians, and a one-year guarantee in writing on every job. Call (361) 320-9467 to schedule a free estimate and get your number on paper the same day.
We know Ontario’s housing stock because we work on it every week. The post-war tracts off Holt Blvd, the newer subdivisions north of the 10, and the homes backing up to the 60 Freeway corridor all have different roofing needs, and the crews we dispatch to Ontario answer to Travis Oakley, who keeps every job running under The Garrison Standard.
Why Brennan Roofing Is Ontario’s Preferred Roofing Company
Ontario homeowners tend to call us after a disappointing experience with another roofer: someone who no-showed, bumped the price at the door, or left flashing loose after a repair. Our protocol is the same on every job here. The price goes on paper before any work begins, and it does not move at the door. Our technicians arrive in uniform, background-checked, inside the promised window, and the work carries the 365-Day Done Right Promise: if it fails within one year, we return and make it right at no charge.
Because we dispatch and schedule for Ontario from our Inland Empire office, we can get a crew and a ladder to neighborhoods like Creekside, Ontario Ranch, and the historic Euclid Avenue district without burning half the day in traffic. That matters when a Santa Ana event has torn shingles off and your attic is exposed. Phones are answered by a live person around the clock, no voicemail, no callback queue. As an independently owned member of the Roofing Company family founded in 2000, we operate under the same Garrison Standard at every address we serve.
Written Pricing, No Door Shifts
Ontario homeowners have told us the same story enough times that we built our process around it: a roofer gives a verbal ballpark, then finds “unexpected rot” and doubles the number. We do not work that way. Before we tear anything off, you have a line-item price in writing. If our crew finds skip sheathing or hidden decking issues during tear-off, we stop work, show you what we found, and write the change order before another nail goes in.
The 365-Day Done Right Promise
We guarantee every repair and installation in writing for one full year. If a repair fails inside that period, the second visit is free. That is not a sales claim; it is The Garrison Code we follow on every Ontario job, from a two-shingle patch to a full redeck and reroof.
Metal Roof Installation in Ontario
Metal roof installation in Ontario runs $16 to $28 per square foot installed depending on panel profile, seam type, and whether we are stripping the old roof or installing over a sound deck. That puts a typical 1,400-square-foot Ontario ranch between $22,400 and $39,200. For Ontario’s summer heat, a standing-seam metal roof in a light or reflective finish cuts attic temperatures and shrugs off the UV that eats asphalt shingles. Because Ontario sits in a Santa Ana wind zone, our metal installs use enhanced fastening and wind-rated clips so the roof earns the uplift rating the manufacturer publishes.
Standing Seam vs. Exposed Fastener
Standing-seam panels hide every fastener underneath the seam, which eliminates the leak point that exposed-fastener roofs have at every screw. In Ontario’s heat, those exposed screws also cycle through expansion and contraction, loosening over time. We recommend standing seam for anyone planning to stay in the home more than ten years; exposed fastener works as a budget option on low-slope outbuildings and porches.
Reflective Finishes for Inland Heat
Ontario regularly tops 100°F in July and August, and a dark metal roof absorbs that heat and pushes it into the attic. We specify a reflective or cool roof finish. The material cost difference is modest, and the attic temperature drop is measurable. For homes built in the 1960s with minimal attic insulation, this is one of the fastest ways to cut cooling costs before you touch the HVAC.
Residential Roofing in Ontario
Residential roofing in Ontario breaks down like this: a standard architectural asphalt shingle re-roof on a 1,400-square-foot tract home runs $9,800 to $16,500 including tear-off, decking repair as needed, underlayment, and flashing. If the home still has its original wood shake, add $3,200 to $5,400 for a full plywood redeck, because the old 1×6 skip sheathing will not pass code and will not give the new roof a structurally sound base. Most residential work we do in Ontario is either a full re-roof of a mid-century home or a repair tied to wind damage from a Santa Ana event.
Shingle Re-Roofs With a Wind-Rated Nail Pattern
When we install architectural shingles in Ontario, we hand-nail them to the manufacturer’s high-wind pattern, not the standard four-nail pattern. That difference is the reason two identical-looking GAF Timberline roofs on the same Ontario block can perform differently in a 60 mph gust. The roof has to earn its rating; the shingle alone does not.
Tile and Flat Roofing
Ontario has a decent share of tile roofs in the newer tracts and flat-roofed carports and additions all over the city. Tile needs underlayment replacement more often than tile replacement; flat roof work here is usually modified bitumen or a single-ply membrane. Both come with the same written price, uniformed crew, and one-year guarantee as every other job we run.
Trusted Brands We Service in Ontario
We install materials from GAF, CertainTeed, Atlas, Tamko, and Boral, and we specify by what actually works in Ontario’s climate rather than by rebate. GAF Timberline architectural shingles hold up well here when installed with the enhanced nailing pattern and paired with proper attic ventilation. Atlas and Tamko both make storm-rated shingle lines that suit the Santa Ana exposure. We keep common flashing components, sealants, and fasteners stocked in our Inland Empire inventory, so an Ontario repair in the Creekside or Ontario Ranch area doesn’t wait on a ground shipment.
Common Roofing Problems We See in Ontario Homes
- Santa Ana shingle blow-off. Homes near the 60 Freeway corridor lose shingles in wind events because the roof was nailed with a standard pattern on skip sheathing. The shingle meets its wind rating on paper; the installation never did.
- Original wood shake at end of life. Post-war Ontario tract homes rarely had their shake roofs replaced before the 1990s. Most are now crumbling, leaking, or both, and the 1×6 skip sheathing underneath is not a legal nailing surface for a new roof.
- Inadequate attic ventilation. Ontario’s attic spaces cook in the summer. A roof with insufficient intake and exhaust venting bakes the shingle backing and underlayment from below, cutting the roof’s life by years.
- Flashing failures at masonry junctions. Many Ontario chimneys and parapet walls have old galvanized flashing that has oxidized through after decades of UV exposure. The fix is always a full flashing replacement, never a smear of sealant.
Pricing for Roofing Company in Ontario, CA
Here are range figures we’re comfortable putting in writing for Ontario before we see your roof. A full architectural shingle re-roof on a tract home: $9,800 to $16,500. A full wood shake tear-off with plywood redeck: add $3,200 to $5,400. A targeted repair: $350 to $1,100. Metal roof installation: $16 to $28 per square foot. The factors that move your number line-item by line-item are roof height and pitch, decking condition, chimney and valley count, and whether we are pulling a city permit, which we do when the scope requires it. You get the printed number before work starts, always. Call (361) 320-9467 for a free estimate and a written quote with no obligation.
We Also Serve Cities Near Ontario
Our Ontario crews regularly work the neighboring cities along the 10 and 60 corridors. We cover Roofing Company in Ontario plus Montclair, Claremont, Upland, and Rancho Cucamonga. If you’re in one of those cities and need a written roofing quote, call (361) 320-9467 and we will get you on the schedule for a free estimate.
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 Roofing Company in Ontario
Your roof was likely nailed with a standard four-nail pattern over original 1×6 skip sheathing, while your neighbor’s roof sits on a solid plywood deck with hand-nailed high-wind fastening. The shingle brand may be identical; the installation is not. We see this constantly in the older tracts near the 60 Freeway corridor. Call (361) 320-9467 and we’ll inspect your nailing pattern and decking before you lose more shingles.
Yes, in almost every case. The 1×6 gap sheathing under Ontario’s original wood shake roofs does not meet current code and will not provide a stable nailing surface for modern shingles. Plan on a full plywood redeck as part of the job. We write it into your quote upfront so there are no surprises at tear-off.
Architectural asphalt shingles with a high-wind nail pattern and proper attic ventilation handle Ontario’s climate well, and metal roofing with a reflective finish holds up even better over the long haul. The material matters less than the decking and ventilation under it. We recommend against unvented dark-shingle installs on mid-century Ontario homes; heat buildup shortens their life.
Line up the line items: Does the higher bid include a plywood redeck, synthetic underlayment, new drip edge, and a ridge vent? Does the lower bid hand-nail to the high-wind pattern or use the standard four nails? When you compare apples to apples, cheap bids in Ontario are usually cheap because they skip the ventilation or the redeck, which costs you more inside a decade.
Many shingle manufacturers condition their wind warranties on installation with an enhanced nailing pattern, especially in high-wind zones like Ontario’s Santa Ana corridor. We install to that pattern as standard practice, not as an upgrade. If your insurer has questions, we document the fastening method in writing so you have the paperwork before the claim is ever needed. Call (361) 320-9467 for a free estimate and a written answer on your specific roof.
On a 1962 tract home off Holt Blvd near the 60, our crew tore off a failing wood shake roof and found the original 1×6 skip sheathing. It was not code-compliant for a re-roof. We redecked the full square footage in plywood, laid synthetic underlayment and ice and water shield in the valleys, installed new drip edge, ridge vent, and starter strip, then hand-nailed GAF Timberline architectural shingles to the manufacturer’s high-wind pattern. The homeowner had already lost shingles in a prior Santa Ana event. The new assembly is rated for the uplift loads that failed the old roof. That is the same standard Travis Oakley holds on every Ontario job, from a single repair to a full re-roof: written price first, uniformed background-checked crew, and a guarantee in writing for one full year. Call (361) 320-9467 to schedule your free estimate.
Written by Travis Oakley, Owner at Brennan Roofing, serving Ontario with written pricing and the 365-Day Done Right Promise.