--- title: "Flat Roof Repair in Ottawa, ON | flat-roof-repair.ca" description: "Flat roof leak repair, replacement and maintenance in Ottawa, Ontario, for houses, condos and commercial buildings. Leak repair, repairs and replacement." url: https://flat-roof-repair.ca/locations/ottawa/ last_updated: 2026-10-23 --- # Flat roof repair in Ottawa We repair, replace and maintain flat roofs in Ottawa: 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 Ottawa Townhouses and row houses are common in Ottawa, and their flat roof sections often span several units. A leak can start on one unit's section and show up in the home next door. Ottawa has one of the ten heaviest design snow loads of the 40 cities on this site, so drains and parapet flashings get extra attention. 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/). ## Government core, older neighbourhoods and suburbs in Ottawa Ottawa grew from a lumber town into the national capital in 1857, and the federal public service grew sharply during the Second World War. Centretown, Lower Town, Hintonburg and Vanier hold older housing, many Centretown homes being red brick. Suburbs such as Nepean, Gloucester, Kanata and Orleans were later joined to it, and in 2001 the region was merged into one city. Census data shows about 44% of homes were built before 1981, and about 21% are row houses. Older brick homes in Centretown and Hintonburg often have flat roofs over rear additions and kitchens. Government and office buildings, apartment towers and hospital campuses have large low-slope roofs with parapets and rooftop equipment. The city's large tech sector adds office and industrial roofs. The newer row-house and townhouse blocks in Barrhaven and Orleans commonly use membrane roofs over flat sections. ## Ottawa 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 Ottawa has to handle. - **undefined** - **undefined** - **undefined** - **undefined** - **undefined** - **undefined** - **undefined** ## Homes and buildings in Ottawa The age and type of buildings shape the flat roofs we see. These are the 2021 Census figures for Ottawa. - **undefined** - **undefined** - **undefined** - **undefined** - **undefined** - **undefined** ## Storms that hit Ottawa - 21 September 2018: Tornadoes struck the Ottawa area, including an EF3 at Dunrobin and an EF2 in Nepean, damaging buildings and knocking out power to over 300,000 customers. ([source](https://en.wikipedia.org/wiki/2018_United_States%E2%80%93Canada_tornado_outbreak)) - 21 May 2022: A derecho brought a damaging downburst with winds up to 190 km/h to southern Ottawa, with many homes damaged by wind and falling trees. ([source](https://en.wikipedia.org/wiki/May_2022_Canadian_derecho)) ## Ottawa: facts for property owners - Population of Ottawa: 1,017,449 (2021 Census). ([source](https://en.wikipedia.org/wiki/List_of_municipalities_in_Ontario)) > 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 Ottawa | 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 | | [House flat roof replacement (about 1,000 sq ft)](https://flat-roof-repair.ca/property-types/townhouses-and-row-houses/) | from $8,000 per roof | 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 Ottawa - [Townhouses and row houses](https://flat-roof-repair.ca/property-types/townhouses-and-row-houses/) - [Condo buildings](https://flat-roof-repair.ca/property-types/condo-buildings/) - [Apartment buildings](https://flat-roof-repair.ca/property-types/apartment-buildings/) - [Houses](https://flat-roof-repair.ca/property-types/houses/) - [All property types](https://flat-roof-repair.ca/property-types/) ## Nearby cities - [Cornwall](https://flat-roof-repair.ca/locations/cornwall/) - [Kingston](https://flat-roof-repair.ca/locations/kingston/) - [Belleville](https://flat-roof-repair.ca/locations/belleville/) - [Eastern Ontario](https://flat-roof-repair.ca/locations/eastern-ontario/) ## Flat roofs in Ottawa: questions **How much does flat roof repair cost in Ottawa?** A small leak repair starts from $350 per repair and a new house flat roof starts from $8,000 per roof. Prices in Ottawa depend on access, layers to remove and the membrane. See [pricing](https://flat-roof-repair.ca/pricing/). **Why does my flat roof in Ottawa leak in late winter?** Melting snow refreezes at drains and edges overnight, then backs up under seams and flashings during the day. See [ice and snow damage](https://flat-roof-repair.ca/problems/ice-and-snow-damage/). **Do I need a permit to replace a flat roof in Ottawa?** Check with the Ottawa 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/). **The leak in my Ottawa townhouse may come from next door. What now?** Send photos of your ceiling and, if you can, of the roof. We check where the water enters, including the joint between units, and tell you whose section it is. See [townhouses and row houses](https://flat-roof-repair.ca/property-types/townhouses-and-row-houses/). **Do you also work near Ottawa?** Yes, including Cornwall, Kingston, Belleville and the rest of eastern Ontario. See [Eastern Ontario](https://flat-roof-repair.ca/locations/eastern-ontario/). ## Related - [Flat roof repair in Eastern Ontario](https://flat-roof-repair.ca/locations/eastern-ontario/) - [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