Roof Replacement in Ontario — Written Price, Workmanship Warranty

Fast, Reliable Roof Replacement Across Ontario

Roof replacement in Ontario generally runs $8,500 to $16,000 for a typical single-story tract home, with architectural shingles on the pitched sections and, where needed, a membrane system on the flat or low-slope portions. That’s the honest range we quote most often around the 91761 and 91762 ZIPs. Our crews work Ontario neighborhoods every week, so we’re not guessing at your roof’s age, pitch, or the decking the 1962 original is sitting on. Call (877) 755-4274 and we’ll start with an inspection that tells you what actually needs replacing, and what has years left in it.

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Why Weathervane Roof Repair Is Ontario’s Preferred Roof Replacement Company

We’re a roofing-only company, which means every inspection, repair, and replacement we do connects directly to the roof. Nobody here is also running a plumbing truck or a window crew. That focus matters in Ontario, where the housing stock splits between 1950s-70s tract homes and newer infill, and the failure modes are different for each. Gil Tanner, who leads our team, built our process around one rule: inspection first, replacement only when it’s actually warranted. We’ve talked homeowners out of a full Roof Replacement and into a targeted repair more times than we can count, because a $600 fix that buys five more years beats a $12,000 tear-off the roof doesn’t need yet.

Ontario homeowners call us after Santa Ana events, after a granule-heavy gutter cleaning, or after a home inspector flags the roof before escrow closes. We know the Euclid Avenue corridor, the Creekside neighborhoods, and the older pockets off Holt Boulevard where the original skip sheathing is still under the shingles. That local familiarity means our quotes reflect what we’ll actually find, not a worst-case number designed to protect us from surprise.

Asphalt Shingle Roof Replacement in Ontario

Asphalt Shingle Roof Replacement in Ontario is the service we do most on the pitched front sections of postwar tract homes, where UV exposure and Santa Ana gusts have done the damage. A standard tear-off and architectural shingle replacement on a 1,200 to 1,600 square foot Ontario rancher typically runs $7,500 to $12,000, depending on decking condition and the ridge and edge detail. The old three-tabs on these homes weren’t rated for the heat cycling we get here, and most have lost granule coverage to the point where the fiberglass mat is starting to show.

Decking Assessment Before We Order Shingles

We won’t quote a shingle replacement on a 1960s Ontario home without checking what’s under the existing roof. Half-inch skip sheathing was standard on many of these builds, and it won’t hold a nailed architectural shingle at the manufacturer’s wind rating. If we can’t see the decking from the attic, we’ll write a decking allowance into the contract and explain exactly what triggers it.

What the Tear-Off Usually Reveals

On Ontario tract homes from this era, we regularly find rotted sections under the old vents and along the eaves, plus underlayment that has turned brittle and cracked from decades of dry heat. None of that is a surprise to us, but it needs to be priced correctly and approved in writing before we proceed. That’s why our quotes include line items, not a single number that hides a thousand square feet of unknowns.

New Roof Installation in Ontario

New Roof Installation in Ontario comes up two ways: new construction on infill lots, and full replacement where the existing roof system is too far gone or too poorly pitched to patch. New builds around the 91764 ZIP and the newer subdivisions east of the 15 typically run $9,000 to $15,000 for architectural shingle systems on standard two-story plans. Add a flat roof section over a patio or over the garage and you’re into a different product category, which we handle separately and honestly.

New Construction Roofing

We work with Ontario builders and homeowners on new construction, and we treat the roof as the weather-facing system it is, not a line item to value-engineer. The same hot summers and wind events that age an old roof in five years will age a new one in fifteen if the underlayment, fastening pattern, and edge details aren’t right from the start. We quote it correctly the first time, with the brand and product named on the contract.

Replacement on Low-Slope and Flat Sections

Many Ontario ranchers have a low-slope rear section or a flat patio roof that shingles were never meant to cover. If you’ve been patching the same section every few years, it’s time to look at a proper membrane system instead. We install single-ply membranes with the right flashing details, and we’ll show you the difference in writing before you spend a dollar.

Trusted Brands We Service in Ontario

We install and service shingles from seven major manufacturers: GAF, CertainTeed, Owens Corning, IKO, Atlas, Tamko, and Boral. The right product for your Ontario roof depends on the existing system, your budget, and what the sun and wind are doing to the south and east exposures. We stock or order at the best possible turnaround for Ontario customers, so you’re not waiting three weeks for a special-run color. And because we’re brand-agnostic, the recommendation you get is based on fit, not on what we happen to have loaded on the truck.

Common Roof Replacement Problems We See in Ontario Homes

• Skip sheathing under original shingles. Half-inch boards with gaps between them won’t hold a modern architectural shingle at wind rating. On 1950s-70s Ontario tract homes, this is the most common tear-off surprise, and it changes the job from a shingle swap to a re-deck before we can proceed.
• Low-pitch and flat sections patched with shingles that were never correct. Front pitched runs handle shingles fine. Rear additions and patio covers often don’t. We see repeated leaks and fascia rot where someone kept nailing shingles onto a 2/12 slope.
• Santa Ana wind damage at ridgelines and eaves. Weathered shingles shear at the edges and crease along the ridge where the original drip edge and vent nails have backed out. The damage is directional and predictable, and we inspect specifically for it after every wind event.
• UV granule loss and thermal cracking on full-sun exposures. Ontario barely sees rain, but the dry heat cycles shingle surfaces through expansion and contraction daily. South and west faces show granule loss years before the north face does, and that imbalance is what we document in an inspection report.

Pricing for Roof Replacement in Ontario, CA

We Also Serve Cities Near Ontario

Our crews cover Ontario and the surrounding Inland Empire communities. If you’re in Montclair, Upland, Chino, or San Antonio Heights, the same inspection-first process applies. We’re familiar with the housing stock and weather exposure across this entire corridor, and we quote each job based on what’s actually on your roof, not a one-size number. Whether you’re in Ontario proper or one of the neighboring cities, we’ll give you the straight answer on repair versus replacement, and we’ll put it in writing before any work starts. Learn more about what we do across the region on our Roof Replacement in Ontario page.

FAQs About Roof Replacement in Ontario