Roof replacement means stripping the old roofing material down to the deck (or in some cases overlaying, though most reputable contractors in Mississauga will recommend a full tear-off), repairing any damaged sheathing, installing new underlayment and ice-and-water shield, then laying new shingles, flashing, and ventilation components. It's a bigger job than a repair: expect a crew on site for one to three days depending on roof size and complexity, plus a dumpster or disposal trailer parked out front for the old material. This category covers the 10 businesses in Mississauga that handle full roof replacements and new installations, from single-family homes to larger residential properties.
What to look for before you hire
A few things separate a solid re-roof from a callback-prone one. Check that the contractor is licensed and carries liability insurance and WSIB coverage, since roofing work involves real fall risk and you don't want to be on the hook if someone gets hurt on your property. Ask what underlayment and ice-and-water shield they use, especially around eaves and valleys, since Mississauga winters put real stress on that detail. Get a written estimate that spells out material brand and grade, tear-off and disposal, flashing and vent work, and warranty terms (both the manufacturer's shingle warranty and the contractor's labor warranty are worth confirming separately). Ask how they protect siding, gutters, and landscaping during the tear-off, and whether they'll show you photos of the deck once the old roof is off, since hidden rot or damage is common and should be flagged before it's covered up.
How our scoring works
We rank the 10 contractors in this category using a consistent set of factors, weighted the same way for every business so you can compare fairly. That includes things like review volume and rating trends, responsiveness, and how consistently a contractor delivers on the basics buyers care about. The full breakdown of what goes into the score and how we weight each factor is on our methodology page. For the ranked list of all 10 contractors with their scores, see the best roofing contractors in Mississauga guide.
