Full Roof Replacement Cost in Montreal

A full roof replacement encompasses everything involved in removing the existing roofing system and installing a new one. The total cost is determined by the roof size, pitch and complexity, the material selected, the condition of the underlying structure, and the accessibility of the building. The process begins with removing the existing roofing material down to the deck. This tear-off reveals the condition of the plywood or OSB sheathing, allowing any damaged sections to be replaced. It also provides the opportunity to inspect the roof structure for signs of moisture damage, rot, or structural issues that should be addressed before new roofing is installed. Once the deck is sound, a waterproof underlayment is applied. Ice and water shield membrane is required along eaves, in valleys, and around penetrations to protect against water infiltration from ice dams and wind-driven rain. Synthetic underlayment covers the remaining roof surface. New drip edge, flashing, and ventilation components are installed before the roofing material itself. These components are critical to the performance and longevity of the system. Flashing around chimneys, skylights, plumbing vents, and wall-to-roof transitions must be properly stepped, sealed, and integrated with the roofing material. The roofing material is then installed according to manufacturer specifications. For shingles, this means proper nailing patterns, exposure, and alignment. For membrane systems, it means proper adhesion, seam welding, and detail work. Following manufacturer specifications is essential for warranty coverage. Finally, cleanup and inspection complete the project. All debris is removed from the property, and the finished roof is inspected to verify that all details are properly executed. Based on Quebec market data for 2025-2026, here is what a full roof replacement typically costs in the Montreal area: The total cost depends primarily on the material chosen. According to Quebec industry sources: Asphalt shingle roof replacement: $6 to $12 per square foot, or approximately $8,000 to $24,000 for a typical residential property. The average across Quebec is about $9,300 for a standard home (Soumissions Toiture, Comparer 3 Couvreurs, 2025). Flat roof membrane replacement (elastomeric): $9 to $20 per square foot, or approximately $10,000 to $30,000 depending on roof size and scope of work (Soumissions Quebec, 2026). Metal roof installation: $13 to $30 per square foot, or approximately $15,000 to $30,000 for typical projects. Premium standing-seam systems on larger roofs can reach $60,000 (Soumission Renovation, Soumissions Toiture, 2026). These ranges include tear-off of the existing roofing material, disposal, new underlayment and ice-and-water shield, flashing, ventilation components, and the roofing material itself. Deck repairs are typically estimated separately, as the condition of the sheathing can only be fully assessed once the old roofing is removed. After a full replacement, expect to budget approximately 1 to 2 percent of the total roof value per year for ongoing maintenance, including inspections, debris clearing, and minor repairs as needed (Soumissions Quebec). Quebec homeowners should ensure that any contractor they hire holds a valid license from the Regie du Batiment du Quebec (RBQ). A licensed contractor provides the protections required by Quebec consumer law, including warranty coverage and insurance. Contact us for a comprehensive roofing assessment. We inspect your existing roof, explain your options, and provide a detailed estimate with no surprises.