Skylight work covers new installations cut into an existing roof deck, replacement of an old or fogged unit with a modern one, and repairs to flashing and seals around skylights that leak or sweat condensation. It sits at the crossover between roofing and carpentry: whoever does the job needs to cut and frame an opening correctly, tie the flashing into the surrounding shingles or membrane so water sheds properly, and set a unit that's rated for Mississauga's snow loads and temperature swings. We've reviewed 13 skylight contractors serving the Mississauga area, and the work they do ranges from single-unit replacements on a sloped asphalt roof to multi-skylight jobs on flat commercial or low-slope residential roofs.
What to look for in a skylight contractor
A few things separate a contractor worth calling from one to avoid. Ask whether they carry manufacturer certification for the skylight brands they install (Velux and Fakro are the two you'll see most often locally), since a certified installer usually gets a longer warranty on both the unit and the install. Ask how they handle flashing on your specific roof type: step flashing and a proper cricket above the skylight matter a lot more on a sloped shingle roof in a snowy climate than on a flat membrane roof. Get a written scope that separates the cost of the skylight unit from labour, and confirm they carry liability insurance and WSIB coverage, since this work involves cutting into your roof deck and any mistake there gets expensive fast.
How our scoring works
Every contractor in this category is scored on the same criteria: verified licensing and insurance, review volume and rating trends, responsiveness, and how consistently they show up for warranty or follow-up work. For a full side-by-side comparison and our top picks, see the ranked guide to Mississauga roofing contractors. Details on how we calculate scores and what data feeds into them are on our methodology page.
