--- title: "Flat Roof Repair and Replacement in Ontario | flat-roof-repair.ca" description: "Flat roof leak repair, repairs, replacement and maintenance for homes and businesses across Ontario. EPDM, TPO, PVC, torch-on and tar and gravel roofs." url: https://flat-roof-repair.ca/ last_updated: 2026-10-23 --- # Flat roof repair and replacement in Ontario We find and fix flat roof leaks, repair worn membranes and replace roofs that are past saving. Send a few details and photos, and we reply by email with next steps and a written quote. > Urgent leaks: mark the request as urgent and we answer those first. We do not promise a fixed arrival time. Use the [quote form](https://flat-roof-repair.ca/request-a-quote/?interest=urgent) and tick "Water is coming in now". ## What we do - [Leak repair](https://flat-roof-repair.ca/services/flat-roof-leak-repair/): Trace where the water gets in and fix that spot, not just the stain. - [Repairs](https://flat-roof-repair.ca/services/flat-roof-repair/): Seams, blisters, cracks, flashings and worn areas on an otherwise sound roof. - [Replacement](https://flat-roof-repair.ca/services/flat-roof-replacement/): Tear-off, deck check, insulation and a new membrane when repairs stop making sense. - [Inspection and maintenance](https://flat-roof-repair.ca/services/flat-roof-inspection/): A photo report on the roof and seasonal visits that catch problems early. ## Roofs we work on - [Houses and townhouses](https://flat-roof-repair.ca/property-types/houses/): Rear additions, dormers and full flat roofs on detached, semi and row houses. - [Garages and additions](https://flat-roof-repair.ca/property-types/garages-and-additions/): Small roofs that leak into garages, porches and sunrooms. - [Condo and apartment buildings](https://flat-roof-repair.ca/property-types/condo-buildings/): Repairs and replacements planned with boards and property managers. - [Plazas, offices and warehouses](https://flat-roof-repair.ca/property-types/retail-plazas/): Large low-slope roofs with drains, rooftop units and tenants below. ## How it works - **Send the details**: Your city, the type of building and what is happening. Photos of the roof and any stains help most. - **Roof visit**: We look at the membrane, seams, flashings, drains and the inside, then explain what we found. - **Written quote**: The quote lists the work, materials and price, and says whether repair or replacement makes more sense. - **Repair or new roof**: We do the work, clean up and send photos of the finished roof. ## Starting prices | Item | Starting price | |---|---| | [Small leak repair (patch, seam or puncture)](https://flat-roof-repair.ca/services/flat-roof-leak-repair/) | from $350 per repair | | [Roof inspection with written photo report (house)](https://flat-roof-repair.ca/services/flat-roof-inspection/) | from $250 per roof | | [Small flat roof replacement (garage, porch or addition)](https://flat-roof-repair.ca/property-types/garages-and-additions/) | from $4,000 per roof | | [House flat roof replacement (about 1,000 sq ft)](https://flat-roof-repair.ca/services/flat-roof-replacement/) | from $8,000 per roof | | [Commercial roof replacement](https://flat-roof-repair.ca/property-types/warehouses-and-industrial/) | from $8 per sq ft | Starting prices in CAD before 13% HST, based on typical Ontario contractor rates (mostly Toronto and the GTA). The final price depends on roof size, access, the layers to remove, the membrane, drains and flashings, and is confirmed in your written quote. See all [prices](https://flat-roof-repair.ca/pricing/) and [what a flat roof costs in Ontario](https://flat-roof-repair.ca/guides/flat-roof-cost-ontario/). ## Built for Ontario weather Flat roofs in Ontario take freeze–thaw cycles, heavy snow, ice at the drains, fast spring melt and summer downpours. Most leaks start where the membrane meets something else: a seam, a parapet, a drain, a vent or a skylight. That is why every visit checks those details first, and why a good repair fixes the cause, such as a blocked drain or a low spot that holds water. [Flat roofs in winter](https://flat-roof-repair.ca/guides/flat-roof-in-winter/) ## Flat roof materials - [EPDM (rubber)](https://flat-roof-repair.ca/materials/epdm-roofing/): Black rubber sheet, commonly lasting 20 to 30 years. - [TPO and PVC](https://flat-roof-repair.ca/materials/tpo-roofing/): White heat-welded membranes that reflect summer heat. - [Modified bitumen](https://flat-roof-repair.ca/materials/modified-bitumen-roofing/): Torch-on or self-adhered SBS, common on Ontario houses. - [Built-up (tar and gravel)](https://flat-roof-repair.ca/materials/built-up-roofing/): Layers of felt and asphalt under gravel on older buildings. ## Where we work Across Ontario, from Windsor to Ottawa and north to Thunder Bay. - [Greater Toronto Area](https://flat-roof-repair.ca/locations/greater-toronto-area/) - [Hamilton and Niagara](https://flat-roof-repair.ca/locations/hamilton-niagara/) - [Southwestern Ontario](https://flat-roof-repair.ca/locations/southwestern-ontario/) - [Central Ontario](https://flat-roof-repair.ca/locations/central-ontario/) - [Eastern Ontario](https://flat-roof-repair.ca/locations/eastern-ontario/) - [Northern Ontario](https://flat-roof-repair.ca/locations/northern-ontario/) - [All locations](https://flat-roof-repair.ca/locations/) ## Common questions **How much does flat roof repair cost?** A single leak repair starts from $350 per repair. A new flat roof on a house starts from $8,000 per roof for about 1,000 sq ft. See [pricing](https://flat-roof-repair.ca/pricing/). **Should I repair or replace my flat roof?** Repair if the problem is local and the rest of the membrane is sound. Replace when leaks keep coming back in different places or the insulation underneath is wet. See [repair or replace](https://flat-roof-repair.ca/guides/repair-or-replace-flat-roof/). **Do you handle urgent leaks?** Urgent leaks: mark the request as urgent and we answer those first. We do not promise a fixed arrival time. **Do you work on commercial roofs?** Yes: plazas, offices, warehouses, condo and apartment buildings. See [property types](https://flat-roof-repair.ca/property-types/). ## Related - [What a flat roof costs in Ontario](https://flat-roof-repair.ca/guides/flat-roof-cost-ontario/) - [Common flat roof problems](https://flat-roof-repair.ca/problems/) - [Flat roof prices](https://flat-roof-repair.ca/pricing/) --- Get a quote: https://flat-roof-repair.ca/request-a-quote/ · Email: info@flat-roof-repair.ca