Ontario is two cities in one for a roofer. North of the 60, older neighborhoods spread out from downtown and the tree-lined median of Euclid Ave, with Ontario International Airport on the east side. To the south, Ontario Ranch is filling former dairy land with new planned communities. As a roofing contractor in Ontario, CA, we work in both, serving a city of 175,265 residents (2020 Census) about 35 miles and 70 minutes from our base on Rosemead Blvd. Each half of the city fails in its own way, and we plan for both.
Euclid Ave-era homes, Ontario Ranch tile and inland heat
Ontario falls in Title 24 Climate Zone 10, the inland zone where summers run hotter and longer than in the San Gabriel Valley. That heat ages shingles, sealants and vent boots faster, and Santa Ana wind events between October and March sweep the flat ground with little to break them.
- Older central neighborhoods: composition shingle on post-war and earlier homes, some with layered reroofs and board sheathing.
- Ontario Ranch and other new tracts: concrete tile on modern underlayment, where wind-cracked ridge and hip pieces are the usual first repair.
- Commercial and warehouse districts near the airport and freeways: large flat roofs with rooftop units and drains.
Roofing services for Ontario, CA properties
Cool Roof Installation
Shingle reroofs in Climate Zone 10 must meet Title 24 cool-roof minimums, so most older Ontario homes moving to new shingles end up with a CRRC-rated cool color.
Tile Roof Repair
Wind-cracked ridge and hip tile is the usual repair on Ontario Ranch roofs, and matching the builder's tile profile keeps the repair in line with HOA rules.
Roof Tear-Off
Older central Ontario homes north of the 60 with layered roofs need a tear-off to the deck, which on the oldest houses is often board sheathing rather than plywood.
Warehouse & Industrial Roofing
Large flat roofs on distribution buildings near the airport and the 10, 15 and 60 need seam, drain and curb work before water spreads across the floor below.
Attic Ventilation
Long Zone 10 summers push Ontario attic temperatures high, and adding intake and exhaust vents during a reroof helps the new shingles and the rooms under them.
Garage & Patio Roofs
Patio covers and garage roofs on older Ontario lots often sit too flat for shingles, so they need a cap sheet or membrane that handles the heat and the winter downpours.
What roofing work do Ontario homes need most?
Older shingle roofs usually need roof repair at vent boots and flashing, or a full roof replacement with a tear-off when the shingles have turned brittle. Reroofing half or more of a shingle roof triggers Zone 10 cool-roof minimums in most cases. Newer tile homes mostly call after wind events, when emergency roof repair secures displaced tile before the next storm.
New homes in Ontario Ranch may still be under a builder's warranty, so check its terms before hiring anyone for repairs. HOA approval may also be needed for tile color or profile.
Warehouse and commercial roofs around the airport
Ontario's freeway corridors along the 10, 15 and 60 carry some of the largest distribution and light industrial buildings in the region, and their roofs are a different job from a house. Low-slope membranes span huge areas, so a single failed seam, a clogged drain or a poorly flashed rooftop unit can send water across a lot of floor space before anyone notices.
For owners and property managers, we photograph each problem area, note where it sits on the roof, and separate immediate repairs from longer-term coating or replacement options in the written quote.
Roof trouble in Ontario?
Call with your address. About 70 min (35 mi) from our Rosemead Blvd base, with same-day or next-day visits when crews are free.
- 4.9 from 48 Google reviews
- Based on Rosemead Blvd
- Photos and a written quote before work
Euclid Ave, the Model Colony and the old ag preserve to the south
The Chaffey brothers founded Ontario in 1882 as the Model Colony and laid out Euclid Ave with its wide grassy median, and central Ontario incorporated in 1891. The oldest homes sit near that median and downtown, where board sheathing, several roofing layers and later additions are common. Ontario Mills, opened in 1996, and Toyota Arena sit toward the east side near the airport and freeways.
South of the 60, the old agricultural preserve was rezoned for homes and businesses in 1999 and has been building out as Ontario Ranch, so those roofs are young concrete tile. Across the city, the 2020 Census counted 53,219 housing units, with 54.7% of occupied homes owner-occupied. Close to half are rented, so a good share of Ontario calls come from landlords as well as residents.
Ontario permits and scheduling a visit from Rosemead
Ontario's municipal building division issues roof permits, and confirming its current rules before a start date is set saves trouble later. Where a permit is needed, we take it out and book the inspection ourselves.
Call (725) 745-8803 or request a quote. Since Ontario sits toward the eastern limit of our range, the arrival day gets pinned down during that call; same-day or next-day is still possible when crews are free. The inspection produces photos and an itemized written quote, with the permit and any deck replacement listed on separate lines. Our nearest work is described under roofing in Rosemead, and we also serve Chino and Rancho Cucamonga, plus Montclair, Upland and Eastvale.
Reviews from San Gabriel Valley customers
4.9★ from 48 Google reviews (checked Nov 2026)
“awesome roofing team that does solid work. i couldn’t be happier with how my new roof turned out. after the roof replacement was finished, there was a small issue related to the original roof design, not the installation, and david went above and beyond by coming out quickly with william to take care of it himself. …”
“We looked at a few roofing companies to get our roof replaced. One company took the time to explain the whole process in detail. Grant, their representative, brought samples to show us how the new roof would look and gave us different color options to choose from. He answered every question I had with a positive attitude. …”
Roofing questions from Ontario
Is Ontario within your service area?
Yes, near its eastern edge. The drive is about 70 minutes, so we plan Ontario visits ahead and tell you the day a crew can arrive. If crews are free, we can still come same-day or next-day, and every inspection ends with photos and a written quote.
Do Ontario tile roofs have to meet cool-roof rules?
Usually not. Most clay and concrete tile weighs 25 lb/ft² or more, which is a Title 24 exception. Shingle reroofs covering half or more of the roof in Climate Zone 10 generally do have to meet the reflectance minimums, so we check product ratings before you choose a color.
