Metal roofing
Architectural shingles
Tile roofing
GAF
Owens Corning
Flat & low-slopeFree roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Fast, Reliable Roof Replacement Across Ontario
Roof replacement in Ontario, CA typically costs between $8,500 and $18,000 for a standard asphalt shingle tear-off and re-roof on a 1,500 – 2,200 sq. ft. home, depending on material grade, roof complexity, and the condition of the existing decking. We’re Orange County Roofing Co, and we replace roofs across Ontario every week, from the 1950s tract neighborhoods near Euclid Avenue to newer east-side developments in ZIPs 91761 and 91764. Our crew knows what Ontario’s heat and Santa Ana winds do to a roof, and we price accordingly, with a written line-item estimate before any work begins. Call (866) 942-4187 to schedule a free inspection and see what your roof actually needs.
Why Orange County Roofing Co Is Ontario’s Preferred Roof Replacement Company
Ontario homeowners deal with a specific set of roof problems that a coastal contractor simply doesn’t see. Summer temperatures here routinely push past 100°F, and those UV levels bake the granules right off asphalt shingles. Then October rolls around and the Santa Ana winds start howling through the Cajon Pass. We inspect and replace roofs in Ontario knowing exactly which failure modes to look for first, because we see them on a weekly basis.
Our reputation in Ontario is built on showing homeowners what’s actually happening on their roof, not on scaring them into a replacement they don’t need. When we inspect a roof in the 91764 ZIP, we’ll tell you if it has three years left or if it needs a tear-off next month. That’s why homeowners across Ontario call us back when it’s time. We carry seven major shingle brands, which means we recommend the material that fits your home’s exposure and your budget, not whatever brand has the biggest margin for us.
Styles & brands we work with
Roof Replacement Contractor in Ontario
Finding the right Roof Replacement Contractor in Ontario means understanding what opening up your roof actually involves. A roof replacement isn’t just ripping off old shingles and nailing on new ones. It’s exposing what’s underneath: the decking, the flashing, the valleys, and sometimes problems nobody knew were there. That’s where the real cost of a roof replacement in Ontario gets determined.
A typical full roof replacement in Ontario runs $8,500 – $18,000. The biggest variables are decking condition, roof pitch and accessibility, and whether your home has flat sections or multiple rakes and valleys. We provide a written line-item quote before we start, so you know exactly what’s included. You can also explore our Roof Replacement service page for more material and process detail.
Inspection First, Surprises Priced in Writing
Before we touch a single shingle on an Ontario roof, we inspect the entire system, attic included. That’s how we catch decking rot, damaged flashing, and ventilation issues before they become change orders. We write allowances into the contract for exactly this reason, so if we find something once the roof is opened up, the cost was already discussed.
If we do find something unexpected, like rotted decking over a 1960s addition in the 91762 ZIP, we’ll show you photos, explain the scope, and get your written approval before any additional work begins. No surprise invoices, no “we had to do it” phone calls.
Permits and Code Compliance
Roof replacement in Ontario triggers building permits, and permits trigger code inspections. That means if your decking doesn’t meet current shear standards, or your roof lacks proper ventilation, the inspector may flag those items. We handle the permitting for you and we plan for code upgrades from the start, so an inspection doesn’t stall your project or inflate your price mid-job.
Asphalt Shingle Roof Replacement in Ontario
Asphalt Shingle Roof Replacement in Ontario is the most common service we perform, largely because so much of the city’s housing stock was built between the 1950s and 1980s with composition shingle roofs. Those roofs were never designed for the kind of sustained 100°F heat and intense UV that Ontario gets for four to five months of the year. Granule loss comes first, then cracking, then leaks.
Replacing an asphalt shingle roof in Ontario generally runs $8,500 – $15,000 for a standard home, with architectural shingles adding a few thousand over three-tab. The upgrade is worth it here. Architectural shingles carry higher wind ratings and thicker construction, which matters when Santa Ana winds are peeling starter strips off north Ontario homes near the 210.
Architectural Shingles for Ontario’s Wind Corridors
Architectural shingles aren’t cosmetic. They’re laminated, thicker, and rated for higher wind uplift than three-tab. In neighborhoods near the 210 and north Ontario, where downslope gusts hit hardest, we recommend architectural shingles specifically for their 110 – 130 mph wind ratings. It’s the difference between a roof that holds through blow-off season and one that fails at the ridge cap.
We install architectural shingles from manufacturers we stock locally, including GAF, Owens Corning repair in Ontario, and Atlas. Each has different warranty tiers and price points, and we’ll compare them honestly for your specific roof geometry.
Decking and Underlayment on Older Ontario Homes
Older tract homes in 91761 and 91762 often have 3/8-inch plywood or skip sheathing that doesn’t meet current code for asphalt shingle installation. We’ll tell you before we start if your decking needs replacement and what it will add to the job. We also upgrade underlayment on south-facing slopes where UV and heat penetrate hardest, extending the life of the new shingles.
Trusted Brands We Service in Ontario
We carry and install shingles from seven major manufacturers: GAF, CertainTeed, Owens Corning, IKO, Atlas, Tamko, and Boral. That range lets us match material to your home’s actual conditions. A 1960s ranch in Ontario with a low-pitch roof and heavy sun exposure gets a different recommendation than a newer Spanish-style home in the 91764 ZIP. We keep local stock accessible for fast turnaround on Ontario jobs, and because we install multiple brands, the recommendation you get is based on what’s right for your roof, not what’s sitting in our warehouse or paying the biggest rebate this quarter.
See the difference
Before
After
Before
After
Before
AfterCommon Roof Replacement Problems We See in Ontario Homes
- Granule loss on south-facing slopes. After 20-plus years of Ontario summers, shingles on the sun-baked side of a tract home look bare and chalky. Once granules are gone, the asphalt underneath degrades fast and leaks follow the next winter rain.
- Starter strip and ridge cap failures in wind corridors. After any Santa Ana event, we see lift damage in foothill-adjacent neighborhoods near the 210 and north Ontario. Those two components fail before the field shingles do because they sit at the roof’s edges and peaks, where uplift is greatest.
- Hidden leaks around penetrations and valleys. Ontario’s dry weather masks leaks for months. A compromised pipe boot or valley flashing may not show itself until winter rains roll in, and by then water has already been working through the decking.
- Roof decking that doesn’t meet current code. Many 1950s – 1980s Ontario homes have original decking that’s undersized or damaged. Once we tear off the old shingles, we see what’s really there, and we price deck replacement as an allowance so you’re not surprised.
Pricing for Roof Replacement in Ontario, CA
For Ontario homes, here’s what we see across the board: a full asphalt shingle tear-off and replacement runs $8,500 – $18,000 depending on square footage, roof complexity, and material grade. Architectural shingle upgrades typically add $1,500 – $4,500 over three-tab. Roof decking replacement, when needed, runs $2 – $4 per square foot of deck area. Flat or low-slope sections cost more per square foot than pitched roofs due to different membrane systems and detailing. Every estimate we provide is free, itemized, and honored as written unless you approve a change in writing. Call (866) 942-4187 for an exact quote on your Ontario home.
We Also Serve Cities Near Ontario
Beyond Ontario, our crews work regularly in Montclair, Upland, Chino, and San Antonio Heights. If you own a rental or family property in any of those cities, the same inspection-first approach applies. You’ll find more about our Roof Replacement in Ontario coverage and service details on that page, and we’re one call away for anything within a short drive of the 10, 15, or 210 corridors.
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 Roof Replacement in Ontario
We handle them through a written allowance process, not with a surprise invoice at the end. Before we start, we inspect the roof structure and note any visible or likely issues. We then write an allowance into your contract to cover things like decking repair, framing corrections, or ventilation upgrades. If we open the roof and find something outside that allowance, we stop, show you photos, explain the scope in plain language, and get your written approval before we proceed. You’re never committed to additional cost without knowing the number and why it’s needed. If you’d like, call (866) 942-4187 and we can walk through what your specific roof might need before any contract is signed.
Ontario sits in the Inland Empire where summer temperatures regularly exceed 100°F and UV intensity is relentless. That heat bakes asphalt shingles, causing them to lose granules and crack prematurely, especially on south-facing slopes. Then Santa Ana winds funnel through the Cajon Pass from October through March and tear at ridge caps and starter strips along the roof’s edges. Add in the fact that most Ontario homes were built between the 1950s and 1980s with original shingle roofs, and you get a city where roof replacement happens years earlier than on comparable coastal homes. Coastal LA simply doesn’t get the same sustained heat or wind loading. Call (866) 942-4187 for an inspection to see where your roof sits on that timeline.
Look for line items, not lump sums. A legitimate quote for a roof replacement in Ontario should break out: tear-off and disposal, decking replacement as a per-sheet or per-square-foot allowance, underlayment type and brand, shingle brand and grade, flashing and valley work, ridge vent or other ventilation, permits, and a written warranty summary. If a contractor gives you a single number with no breakdown, that’s a red flag. It means every unexpected issue becomes a debate about cost. With us, you get a full line-item quote before we start, and any code-triggered upgrades are written into the contract, not discovered at inspection time. Call (866) 942-4187 and we’ll give you a quote that’s detailed enough to compare against anyone.
They do, and more importantly, they’re rated for it. Architectural shingles are laminated and thicker than three-tab, and most carry wind ratings from 110 to 130 mph when installed with the manufacturer’s recommended nailing pattern. In north Ontario near the 210, where downslope gusts are strongest, that rating matters. After a Santa Ana wind event, we see three-tab shingles lifting at the edges while architectural shingles on the same street hold. If you’re in a foothill-adjacent neighborhood in 91761 or 91764, we’ll recommend architectural shingles specifically for wind resistance. We install them from manufacturers like GAF, Owens Corning, and Atlas, and we can show you the stated wind ratings for each. Call (866) 942-4187 to discuss which product fits your roof’s wind exposure.
When you pull a permit for a roof replacement in Ontario, the city inspects the work against current building code, not the code from 1965. That means if your roof decking is thinner than what the current code requires, or your attic ventilation is inadequate, the inspector may require an upgrade before signing off. We plan for this from day one. We pull the permits ourselves, and we build code compliance into every estimate, so the inspection passes without a last-minute scramble or a mid-project price jump. It’s one of the reasons we recommend getting a detailed inspection before you sign with any contractor, so call (866) 942-4187 to schedule one.
If your roof is showing its age or the last Santa Ana took a toll, we’ll give you an honest assessment. At Orange County Roofing Co, our Roof Replacement team is ready to answer questions, inspect your roof, and provide a written, line-item estimate that holds. Call (866) 942-4187 to schedule your free inspection in Ontario. The estimate is free, the advice is straight, and the work is backed by manufacturer warranties you can inspect before signing.
Written by Kurt Hensley, Owner at Orange County Roofing Co, serving Ontario and the surrounding Inland Empire.