Roofing Contractor in Ontario
A roofing contractor handles anything to do with the roof over your head: full tear-offs and re-roofing, shingle or flat-roof repairs, leak diagnosis, ventilation and insulation work, eavestrough tie-ins, and storm or ice-damming damage. In Mississauga, that also means dealing with the freeze-thaw cycles, wind-driven rain off the lake, and the occasional summer hailstorm that can shorten a roof's life faster than the manufacturer's warranty suggests. We list 13 roofing contractors serving the city, ranging from small local crews to larger installation companies.
What to look for in a roofing contractor
Start with proof, not promises. A legitimate contractor carries WSIB coverage and liability insurance, and will show you both without being asked twice. Ask whether they pull permits when the job requires one (most full re-roofs in Mississauga do), and whether their crews are their own employees or subcontracted out, since that affects who is accountable if something goes wrong. Get a written estimate that breaks out materials, labour, disposal, and warranty terms separately, and be wary of anyone who wants a large deposit before any work starts or who pressures you to sign the same day, a common sign of storm-chaser outfits that appear after bad weather and vanish once paid.
How our scoring works
We score each contractor on verifiable signals: how consistently they respond to and resolve customer complaints, how long they've operated in the area, the volume and trend of their reviews, and whether their licensing and insurance claims hold up. For a full side-by-side ranking of all 13, see the best roofing contractors in Mississauga guide. Our full scoring criteria are explained on the methodology page.
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All roofing contractor, ranked by score and relevance
200 businesses. The order weighs each business's overall score by how much of its reviewed work is roofing contractor, so a lower-scored specialist can rank above a higher-scored generalist. Filter and sort below, or open the full map view.
When you submit a quote or contact form through this site, your enquiry may be shared with partner providers who can do the work. We may earn a referral fee from these partners, but our rankings and scores are determined solely by our published method and are never affected by referral fees.
Common questions about roofing contractor
- How much does a new roof cost in Mississauga?
- For an average detached home, a full asphalt shingle re-roof typically runs from around $6,000 to $15,000+ depending on roof size, pitch, number of layers being removed, and whether decking needs replacing. Metal, slate, or complex rooflines cost more. Get at least three itemized quotes before deciding, since price spreads between contractors for the same job are often wide.
- How often does a roof need to be replaced?
- Standard asphalt shingles usually last 15 to 25 years in Ontario's climate, though wind, ice damming, and poor attic ventilation can shorten that. Have a contractor inspect the roof if it's past 15 years old, after any major hailstorm or windstorm, or if you notice granules in the eavestroughs, curling shingles, or interior water stains.
- What should I expect during a roof replacement?
- A typical residential re-roof takes one to three days depending on size and weather. Expect the crew to tarp landscaping, strip old shingles, inspect and repair the decking as needed, install underlayment and flashing, then lay new shingles, followed by a cleanup pass with a magnetic nail sweep. Ask upfront how they'll protect gutters, siding, and driveways during the work.
- How can I tell if a roofing job was done well?
- Check that flashing around chimneys, vents, and valleys is properly sealed and not just caulked over, that shingle lines are straight and nailed to code (not overdriven or exposed), and that attic ventilation wasn't ignored, since poor ventilation causes premature shingle failure and ice damming. A contractor who explains these details unprompted and provides a written workmanship warranty is a good sign.