Roof replacement covers tearing off an old roof system and installing a new one, or in some cases installing on new construction. For most Toronto homes that means asphalt shingles, though the category also covers flat roofing (torch-down, EPDM, TPO) common on additions and older semi-detached rooflines, plus metal, cedar, and slate on higher-end or heritage properties. The job includes stripping old material down to the deck, checking and replacing damaged plywood, installing ice and water shield along eaves and valleys (a code requirement given Toronto's freeze-thaw winters), laying underlayment, and fitting new flashing around chimneys, vents, and skylights before the final roofing material goes down. This directory lists 61 businesses in the Toronto area that do this work.
What to check before you hire
Roofing draws its share of storm-chasers and unlicensed crews, so a bit of screening goes a long way. Look for a fixed business address (not just a cell number and a magnetic sign), proof of WSIB coverage and liability insurance, and manufacturer certification if you want a materials warranty that actually holds up (GAF, Owens Corning, and IKO all run certified-installer programs in Ontario). Ask for a written quote that breaks out tear-off, deck repair, underlayment, flashing, and disposal separately rather than one lump sum, since that's where corners get cut. A written workmanship warranty separate from the material warranty matters too, and it's worth asking how they handle deck rot discovered mid-job, since that's the most common source of surprise charges.
How our scoring works
We rank the businesses in this category on review volume and rating trends, responsiveness, and consistency over time rather than a single star average, since a handful of five-star reviews from a slow month can be misleading. The full methodology, including how we weight recency and verify listings, is explained on our methodology page. For the current ranked list of Toronto roof replacement contractors, see our best roofing contractors guide.
