GMT Roofing & Exteriors is a premier roofing and exterior construction company serving residential and commercial clients across Alberta and Ontario. Founded in 2008 and headquartered in Calgary, our team specializes in metal roofing, asphalt shingles, natural slate, cedar, siding replacement, and seamless gutter installation. We combine precision engineering with architectural craftsmanship to deliver exterior systems built to withstand Canada's most demanding climates — from Calgary's freeze-thaw cycles to the heavy snow loads of the Rockies and the humid summers of southern Ontario.
This website is built for homeowners, property managers, custom home builders, and commercial building owners who need a trusted exterior contracting partner. Whether you are planning a full roof replacement, a siding upgrade, a standing seam metal installation, or a complete exterior renovation, our platform lets you explore premium materials, browse a portfolio of completed projects across Calgary, Banff, Toronto, and Orillia, and request a free, no-obligation estimate through our structural estimator tool.
GMT Roofing & Exteriors is built and operated by a dedicated team of licensed roofers, exterior specialists, and project managers led by our lead architect. Every project is handled in-house — no subcontracted labour, no cut corners. We handle all permits and inspections, stand behind our workmanship, and back our installations with manufacturer warranties that range from 25 to 100 years depending on the material selected. Our mission is simple: redefine exterior craftsmanship through precision engineering and architectural excellence.