--- title: "Flat Roof Repair in Ajax, ON | flat-roof-repair.ca" description: "Flat roof leak repair, replacement and maintenance in Ajax, Ontario, for houses, condos and commercial buildings. Leak repair, repairs and replacement." url: https://flat-roof-repair.ca/locations/ajax/ last_updated: 2026-10-23 --- # Flat roof repair in Ajax We repair, replace and maintain flat roofs in Ajax: houses, garages and additions, condo and apartment buildings, plazas, offices and warehouses. Send photos and a few details for a written quote. ## Flat roof services in Ajax Ajax has a lot of newer housing, and on newer flat roofs leaks usually start at details rather than the whole membrane: a terrace door, a rooftop unit or a drain on a roof that is otherwise sound. Its design snow load is among the lightest of the cities on this site, so freeze–thaw and summer storms do more damage than snow weight. We find where the water gets in, fix that spot and tell you how much life the rest of the roof has. When a roof is past repair, we [replace it](https://flat-roof-repair.ca/services/flat-roof-replacement/) with EPDM, TPO, PVC or modified bitumen, and fix the [drainage](https://flat-roof-repair.ca/services/roof-drains-and-scuppers/) so water does not sit on the new membrane. Owners and property managers also book [inspections](https://flat-roof-repair.ca/services/flat-roof-inspection/) and [maintenance visits](https://flat-roof-repair.ca/services/flat-roof-maintenance/). ## A planned wartime-industry town: Ajax Ajax has an unusual origin. From 1939 the federal government took farmland for the Defence Industries Limited munitions plant. After it closed in 1945, the site briefly held a University of Toronto campus and a refugee camp, and then the Canada Mortgage and Housing Corporation planned a modern industrial town. Ajax became a town in 1954. By 1969 major employers included Volkswagen Canada and DuPont, and by 1970 Ajax Plaza, Harwood Place Mall and Clover Ridge Plaza had opened. Census data show about 23% of homes were built before 1981 and 41% in 2001 or later. The early planned neighbourhoods and plazas near Downtown Ajax date to the 1950s through 1970s, an era when low-slope roofs on shops, schools and apartment buildings were widely used, and where you often find flat roofs over additions on older houses. Westney Heights and Discovery Bay came mostly in the 1980s. The Central Employment Area and the Audley Road and Salem business areas hold industrial and commercial buildings with large low-slope roofs. Newer townhouse blocks and the Pat Bayly Square area downtown add recent membrane roofing. ## Ajax weather and your flat roof Ontario's Building Code sets the climate values used to design roofs in each municipality. They show what a flat roof in Ajax has to handle. - **undefined** - **undefined** - **undefined** - **undefined** - **undefined** - **undefined** - **undefined** ## Homes and buildings in Ajax The age and type of buildings shape the flat roofs we see. These are the 2021 Census figures for Ajax. - **undefined** - **undefined** - **undefined** - **undefined** - **undefined** - **undefined** ## Ajax: facts for property owners - Population of Ajax: 126,666 (2021 Census). ([source](https://en.wikipedia.org/wiki/List_of_municipalities_in_Ontario)) - Ajax is part of the Regional Municipality of Durham. > Look at the ceiling under a flat roof after the first big thaw and after heavy rain. A new stain is easier and cheaper to trace early. ## Starting prices in Ajax | Item | Starting price | |---|---| | [Small leak repair (patch, seam or puncture)](https://flat-roof-repair.ca/services/flat-roof-leak-repair/) | from $350 per repair | | [Flashing repair or replacement](https://flat-roof-repair.ca/services/flashing-and-seam-repair/) | from $500 per repair | | [Maintenance visit (drains, seams, flashings, photos)](https://flat-roof-repair.ca/services/flat-roof-maintenance/) | from $295 per visit | 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/). ## Roofs we work on in Ajax - [Townhouses and row houses](https://flat-roof-repair.ca/property-types/townhouses-and-row-houses/) - [Houses](https://flat-roof-repair.ca/property-types/houses/) - [Garages and additions](https://flat-roof-repair.ca/property-types/garages-and-additions/) - [Condo buildings](https://flat-roof-repair.ca/property-types/condo-buildings/) - [All property types](https://flat-roof-repair.ca/property-types/) ## Nearby cities - [Pickering](https://flat-roof-repair.ca/locations/pickering/) - [Whitby](https://flat-roof-repair.ca/locations/whitby/) - [Oshawa](https://flat-roof-repair.ca/locations/oshawa/) - [Greater Toronto Area](https://flat-roof-repair.ca/locations/greater-toronto-area/) ## Flat roofs in Ajax: questions **How much does flat roof repair cost in Ajax?** A small leak repair starts from $350 per repair and a new house flat roof starts from $8,000 per roof. Prices in Ajax depend on access, layers to remove and the membrane. See [pricing](https://flat-roof-repair.ca/pricing/). **What causes most flat roof leaks in Ajax?** Details more than the open membrane: seams, parapet and wall flashings, drains, vents and skylights. See [flashing leaks](https://flat-roof-repair.ca/problems/flashing-leaks/) and [clogged drains](https://flat-roof-repair.ca/problems/clogged-drains/). **Do I need a permit to replace a flat roof in Ajax?** Check with the Ajax building department. Replacing the membrane alone is often treated differently from structural work, a new rooftop deck or added weight. See [re-roofing permits in Ontario](https://flat-roof-repair.ca/guides/re-roofing-permits-ontario/). **My Ajax home is fairly new. Why is the flat roof leaking already?** On newer roofs leaks usually start at a detail, not the membrane: a terrace door, a rooftop unit curb, a drain or a sealant joint. Those are repairable. See [flashing leaks](https://flat-roof-repair.ca/problems/flashing-leaks/). **Do you also work near Ajax?** Yes, including Pickering, Whitby, Oshawa and the rest of the GTA. See [Greater Toronto Area](https://flat-roof-repair.ca/locations/greater-toronto-area/). ## Related - [Flat roof repair in Greater Toronto Area](https://flat-roof-repair.ca/locations/greater-toronto-area/) - [Flat roof leak repair](https://flat-roof-repair.ca/services/flat-roof-leak-repair/) - [Flat roof replacement](https://flat-roof-repair.ca/services/flat-roof-replacement/) - [Finding a flat roof leak](https://flat-roof-repair.ca/guides/finding-a-flat-roof-leak/) --- Get a quote: https://flat-roof-repair.ca/request-a-quote/ · Email: info@flat-roof-repair.ca