Markham sits in the heart of York Region just north of Toronto, and its roofs take a real beating from southern Ontario's four-season climate. Winters bring sustained sub-zero temperatures, significant snow accumulation, and dozens of freeze-thaw cycles that work moisture into any gap or crack. Ice damming is one of the most common cold-weather problems here: heat escaping into a poorly ventilated attic melts rooftop snow, which then refreezes at the cold eaves and forces water back up under the shingles. Summers swing the other way, with heat, humidity, UV exposure, and the occasional severe thunderstorm or wind event that can lift or tear improperly fastened shingles. A roof in Markham has to handle both extremes year after year.
The dominant roofing material across Markham's neighbourhoods — from older Markham Village and Unionville homes to newer subdivisions in Cornell, Berczy Village, and Angus Glen — is asphalt shingle, particularly architectural (laminate) shingles that balance durability, wind resistance, and cost. Metal roofing is a growing choice for homeowners who want a 40-to-50-year lifespan and excellent snow-shedding and ice-dam resistance. Many homes also have low-slope or flat sections over additions, porches, and modern builds, which call for membrane systems such as EPDM, TPO, or modified bitumen installed by a flat-roof specialist rather than a shingle crew. Eavestroughs, soffit-and-fascia, and skylights round out most local roofing projects.
On the regulatory side, it is important to understand what Ontario actually requires. Unlike Quebec, which mandates an RBQ contractor licence, Ontario has no provincial roofing trade licence — so any roofer advertising as 'licensed' should be able to show valid Workplace Safety and Insurance Board (WSIB) coverage and commercial general liability insurance instead. WSIB coverage is the credential that protects you if a worker is hurt on your property. For the work itself, the City of Markham requires a building permit when a roof replacement alters the structure, sheathing, or load; routine like-for-like reshingling generally does not need a permit. A reputable contractor will know which rule applies to your project and handle the permit and inspection process for you.
Because Markham's climate is so demanding, choosing an experienced local contractor matters more here than it might in a milder region. A roofer who knows the area will specify a continuous ice-and-water shield membrane along eaves and valleys, balanced attic ventilation, and adequate insulation — the details that actually prevent ice dams and winter leaks. Local, established companies are also easier to hold accountable on workmanship warranties and are more likely to honour them years down the road. The ten contractors profiled below were selected for verifiable longevity, manufacturer certifications such as GAF Master Elite and IKO ShieldPro Plus, confirmed BBB standing where applicable, service breadth, and a genuine track record serving Markham and York Region.