--- title: "Flat Roof Repair in Whitby, ON | flat-roof-repair.ca" description: "Flat roof leak repair, replacement and maintenance in Whitby, Ontario, for houses, condos and commercial buildings. Leak repair, repairs and replacement." url: https://flat-roof-repair.ca/locations/whitby/ last_updated: 2026-10-23 --- # Flat roof repair in Whitby We repair, replace and maintain flat roofs in Whitby: 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 Whitby Whitby 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. 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/). ## Harbour town, steel mill and Brooklin: Whitby's roofs Whitby began around its harbour. Grain was first shipped from there in 1833, the town became the seat of government for Ontario County in 1852, and a railway to Port Perry was built in the 1870s. Population then climbed from 2,732 in 1871 to 138,501 in 2021, with the biggest jumps in 1961 (up 102.1%) and 1991 (up 67.0%). About 70% of homes are single-detached, and census data show about 25% were built before 1981 and 39% in 2001 or later. Downtown Whitby, centred on Dundas Street, has older brick commercial buildings and houses where flat roofs over rear additions and storefronts are common. The growth decades of the 1960s and 1990s left large subdivisions, plazas and schools of those eras. Brooklin and Ashburn in the north are separate communities from the urban south, and with 39% of homes built since 2001, newer membrane roofs on townhouse blocks and garages are part of the picture. In the south, employers such as a Gerdau Ameristeel steel mill, a Sobeys retail support centre and an LCBO warehouse occupy very large low-slope buildings. Trafalgar Castle, from 1859 to 1862, is a reminder that the town also has individual heritage buildings. ## Whitby 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 Whitby has to handle. Figures are for southern Whitby. Brooklin, in the north, has a higher snow load. - **undefined** - **undefined** - **undefined** - **undefined** - **undefined** - **undefined** - **undefined** ## Homes and buildings in Whitby The age and type of buildings shape the flat roofs we see. These are the 2021 Census figures for Whitby. - **undefined** - **undefined** - **undefined** - **undefined** - **undefined** - **undefined** ## Whitby: facts for property owners - Population of Whitby: 138,501 (2021 Census). ([source](https://en.wikipedia.org/wiki/List_of_municipalities_in_Ontario)) - Whitby is part of the Regional Municipality of Durham. - Flow Control Roof Drainage Declaration: Building permit submissions may require a 'Flow Control Roof Drainage Declaration Form' (rule on roof drainage design for engineered roofs). ([source](https://www.whitby.ca/services-and-payments/building-and-renovating/building-permits/)) > 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 Whitby | 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 Whitby - [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 - [Ajax](https://flat-roof-repair.ca/locations/ajax/) - [Oshawa](https://flat-roof-repair.ca/locations/oshawa/) - [Pickering](https://flat-roof-repair.ca/locations/pickering/) - [Greater Toronto Area](https://flat-roof-repair.ca/locations/greater-toronto-area/) ## Flat roofs in Whitby: questions **How much does flat roof repair cost in Whitby?** A small leak repair starts from $350 per repair and a new house flat roof starts from $8,000 per roof. Prices in Whitby depend on access, layers to remove and the membrane. See [pricing](https://flat-roof-repair.ca/pricing/). **What causes most flat roof leaks in Whitby?** 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 Whitby?** Check with the Whitby 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 Whitby 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 Whitby?** Yes, including Ajax, Oshawa, Pickering 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/ ยท Email: info@flat-roof-repair.ca