Top Roofing Contractors in Ontario

Ontario's residential roofing market is dominated by asphalt shingles, with architectural (laminate) shingles now the default choice on the province's large stock of detached and semi-detached suburban housing across the Greater Toronto Area, Ottawa and the southwestern corridor. Standing-seam and steel metal roofing is a growing premium segment, while flat and low-slope membrane systems (EPDM, TPO, modified-bitumen SBS) cover the province's commercial, industrial and downtown flat-roofed building stock. Cedar and slate persist mainly on heritage properties in older Toronto, Ottawa and Kingston neighbourhoods.

The province's continental climate is the primary driver of roofing demand. Ontario winters bring heavy snow load, repeated freeze-thaw cycling and ice damming at the eaves, which is why ice-and-water shield membrane along eaves and valleys, adequate attic ventilation and insulation are standard practice. Summer thunderstorms bring wind uplift and, in southwestern Ontario and the Windsor-Essex area, occasional damaging hail. Northern Ontario cities such as Greater Sudbury see longer, heavier snow seasons that shorten the practical installation window.

Building stock shapes demand across the province: dense postwar and modern subdivisions in the GTA and Ottawa generate steady 15-to-25-year re-roofing cycles on asphalt, while older masonry housing in Hamilton, London and Kingston supports a repair and heritage-restoration trade. The short, cold season concentrates most replacement work between spring and late autumn, with contractors busiest from May through October.

Licensing & Regulations

Roofing is not a compulsory (certified) trade in Ontario, so the province does not issue a dedicated roofing contractor licence. However, roofing contractors must register with and carry Workplace Safety and Insurance Board (WSIB) coverage, which is mandatory for construction businesses in Ontario, including independent operators (narrow exemptions apply, such as work done exclusively and directly for a homeowner). Some municipalities add their own rules: the City of Toronto requires a Building Renovator licence to advertise or perform renovation and roofing work, obtained by passing a trade examination. Full roof replacements also require a municipal building permit under the Ontario Building Code, and homeowners should verify WSIB clearance and liability insurance before hiring.

Typical Costs

For a typical Ontario asphalt-shingle roof replacement in 2026, homeowner cost guides report roughly $5.50 to $8.50 per square foot for a standard residential roof, with steeper or more complex roofs running higher. Total project costs generally fall between about $8,000 and $20,000, with most homeowners paying $10,000 to $16,500 depending on roof size, pitch, tear-off complexity, ventilation upgrades and material grade. Metal and premium systems cost more per square foot.

Do I need a permit to replace my roof in Ontario?

A full roof replacement generally requires a municipal building permit under the Ontario Building Code, and permit rules are administered by your local municipality. Simple like-for-like shingle repairs often do not, but structural changes, adding a layer, or altering the roof deck typically do. Confirm requirements with your city or town's building department before work begins, since local interpretation varies across Ontario municipalities.

Does a roofer need to be licensed in Ontario?

Roofing is not a compulsory trade in Ontario, so there is no provincial roofing licence. Contractors must carry WSIB coverage, which is mandatory for construction businesses. In the City of Toronto, roofers additionally need a municipal Building Renovator licence. Before hiring, homeowners should verify a contractor's WSIB clearance certificate, liability insurance and any applicable local licence rather than relying on a single provincial credential.

What is the best roofing material for Ontario's climate?

Architectural asphalt shingles are the most common choice, balancing cost, durability and freeze-thaw performance on Ontario's sloped residential roofs. Standing-seam metal is a longer-lasting premium option that sheds snow well. Whatever the material, Ontario roofs rely on ice-and-water shield membrane at eaves and valleys plus proper attic ventilation and insulation to control ice damming during freeze-thaw winters. Flat commercial roofs typically use EPDM, TPO or SBS membranes.

When is the best time of year to replace a roof in Ontario?

Late spring through early autumn (roughly May to October) is the main installation window in Ontario, because asphalt shingles seal best in mild temperatures and crews avoid snow and ice. Contractors are busiest in this period, so booking early helps. Emergency repairs happen year-round, but full replacements in deep winter are harder and less common, especially in northern Ontario where the snow season is longer.