Roofing Contractor
in Ontario, CA

Your Local Roofer
in Ontario

Ontario's housing stock ranges from older ranch-style homes near downtown to newer developments off Haven and Milliken. GAX Roofing has worked across the city, from tile roofs in established neighborhoods to shingle replacements in newer subdivisions. We handle Ontario city permits and inspections directly.

One advantage for Ontario homeowners replacing a tile roof: Eagle Roofing Products has a showroom in Rialto, a short drive from Ontario. Eagle makes some of the best concrete tile available, and their showroom lets you see and handle actual profiles and colors before committing to anything. When we do a tile replacement in this area, Eagle is one of the brands we use most, being able to walk in and pick your material in person makes the whole process a lot easier.

We're a family-owned C39 licensed roofing contractor based in Rancho Cucamonga. Our team handles every estimate and project-manages every job from start to finish. You always have a direct line to us with any question, before, during, or after the work is done. Free in-home estimates. There's a pitch, but we're not going to sit at your house for three hours and grind you down.

Roofing Services in Ontario

• Roof Replacement, full tear-off and install, all roof types
• Roof Repairs, leaks, storm damage, flashing, missing shingles
• Asphalt Shingle Roofing, installations built for SoCal heat
• Tile Roofing, concrete and clay tile, lift-and-relay, repairs
• Flat Roofs, TPO, PVC, EPDM, modified bitumen
• Residential Roofing, full-service, one crew, one point of contact

Which of the Four Do You Need in Ontario?

We do four things. Most people call us knowing something is wrong and not knowing which of the four it is, so here is how they actually differ.

• Asphalt shingle roofs. The most common job we run. Old roof comes off to the deck, wood gets repaired where it needs it, new underlayment and shingles go on. We do not do overlays, so a shingle job here is always a full tear-off.
• Tile replacement with new tile. This is when the tile itself is done: cracked, chipped, or a discontinued profile nobody can match. You are picking new material, so this one is a bespoke job. Eagle Roofing Products has a showroom in Rialto and we will sometimes go with you to handle actual profiles and colors before you commit.
• Tile lift and relay. Your tile is fine, what failed is the underlayment beneath it. We lift the tile off, stack it, replace everything underneath, and set the same tile back down. Homeowners search for this as a replacement, and it is one, it replaces the waterproofing. It is just not a tile replacement.
• Flat roofing. Low-slope sections, patio tie-ins, and small commercial buildings. Different material, different failure modes, different repair approach than a sloped roof.

The one that gets mixed up most is the middle two. If the tile is intact, you very likely need a lift and relay, not a tile replacement, and the price difference is not small. If someone quoted you all-new tile without going up to look at whether your existing tile is reusable, get a second look before you sign.

What Ontario Requires

Ontario is the simplest city in our service area for roofing, and that is worth knowing because it saves you money. The city adopted the 2025 codes with no roofing amendments at all, so the classification floor for a house is the state minimum, Class C.

More to the point: Ontario is the only city on this list with zero fire hazard severity zone land of any class. Not Very High, not High, not Moderate. So there is no fire-zone upgrade to a Class A assembly anywhere inside the city, and no wildland-urban interface requirements riding along with your reroof. If a contractor quotes you a fire-rated upgrade as a code requirement in Ontario, ask which zone they think you are in.

Why Ontario Homeowners Choose GAX Roofing

• C39 licensed and fully insured, never hire an unlicensed roofer
• Every estimate and every job run by an owner, start to finish
• We pull permits and handle city inspections
• Straight answers, we don't upsell replacements when repairs will do
• 5.0 stars on Google across dozens of reviews
• Bilingual crew, se habla Espanol
• Free in-home estimates, no obligation

Frequently Asked Questions