Roofing Contractor in Ontario
Roofing work in Mississauga covers everything from a single-shingle repair after a windstorm off Lake Ontario to a full tear-off and replacement on an older Streetsville or Malton bungalow. Contractors in this category handle asphalt shingle installs and repairs, flat roofing on additions and garages, metal roofing, soffit and fascia work, ventilation upgrades, and emergency leak fixes. Some also handle eavestroughs and attic insulation as part of a broader exterior job. With 153 businesses listed, the range runs from small owner-operator crews doing a few jobs a week to larger companies running multiple installation teams.
What to check before hiring
Ask for proof of WSIB coverage and liability insurance, since roofing is one of the higher-risk trades for job-site injury claims. Get a written estimate that specifies shingle brand and grade, the number of layers being removed, underlayment type, and whether flashing and vents are being replaced or reused. A manufacturer warranty on materials is only useful if the installer is certified to issue it, so confirm that in writing. Local experience matters too: crews who know how Mississauga's freeze-thaw cycles and older housing stock (particularly in Cooksville, Clarkson, and Port Credit) affect ice damming and attic ventilation tend to spec jobs more accurately.
How our scoring works
Our ranking weighs verified reviews, consistency of work over time, response to complaints, and licensing signals rather than just star averages. See the ranked list of Mississauga roofing contractors for our current top picks, and read the methodology page for the full breakdown of how we score and verify each business.
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All roofing contractor, ranked by score and relevance
1322 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.
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Common questions about roofing contractor
- How much does a roof replacement cost in Mississauga?
- For a standard asphalt shingle tear-off and replacement on a typical detached home, expect a wide range depending on roof size, pitch, number of layers being removed, and material grade. Get at least three itemized quotes, since price gaps often come down to shingle quality, warranty terms, or how much prep work (deck repair, flashing, ventilation) is included.
- How often does a roof need to be replaced?
- Standard asphalt shingles typically last 15 to 25 years depending on installation quality, attic ventilation, and sun exposure, while premium shingles and metal roofing can last longer. Regular inspections after major storms and before winter help catch small problems, like lifted shingles or damaged flashing, before they turn into leaks.
- What should I expect during a roofing job?
- A typical shingle replacement takes one to three days depending on size and weather. Expect the crew to protect landscaping and siding, tear off old material, inspect the deck for rot, install new underlayment and flashing, then clean up with a magnetic sweep for nails. Ask upfront how debris and disposal are handled.
- How can I tell if a roofing contractor does quality work?
- Look for consistent attention to flashing details around chimneys and vents, proper ice and water shield in valleys and along eaves, and correct attic ventilation, since poor ventilation is a common cause of premature shingle failure and ice damming in this climate. Reviews that mention follow-up on warranty claims or fixing issues after the job are a good sign of accountability.