--- title: "Flat Roof Repair in Markham, ON | flat-roof-repair.ca" description: "Flat roof leak repair, replacement and maintenance in Markham, Ontario, for houses, condos and commercial buildings. Drains and flashings for heavy summer storms." url: https://flat-roof-repair.ca/locations/markham/ last_updated: 2026-10-23 --- # Flat roof repair in Markham We repair, replace and maintain flat roofs in Markham: 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 Markham Markham 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/). ## Heritage villages and technology campuses in Markham Markham has a long settlement history. German families arrived at German Mills in 1794, Mennonites founded Reesorville around 1803, and by 1851 Markham Village had mills, a foundry and a brewery. A rail line reached Markham Village and Unionville in 1871. Light industry and offices moved in during the 1980s, and today more than 1,100 technology and life-science companies are based in the city. Census figures show about 19% of homes were built before 1981 and 47% in 2001 or later. The old centres of Markham Village and Unionville have brick storefronts and older houses where flat roofs over additions and rear sections are common. Cornell, Berczy Village and South Unionville (largely from the 1990s onward) are later subdivisions, with townhouse blocks and stacked units that typically use membrane roofs. Business parks and former corporate offices along Highway 7 and Markham Road have large low-slope roofs, and shopping centres such as Pacific Mall and First Markham Place add big flat commercial roofs. Each of these areas has a different roof age and a different kind of exposure. ## Markham 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 Markham has to handle. - **undefined** - **undefined** - **undefined** - **undefined** - **undefined** - **undefined** - **undefined** ## Homes and buildings in Markham The age and type of buildings shape the flat roofs we see. These are the 2021 Census figures for Markham. - **undefined** - **undefined** - **undefined** - **undefined** - **undefined** - **undefined** ## Markham: facts for property owners - Population of Markham: 338,503 (2021 Census). ([source](https://en.wikipedia.org/wiki/List_of_municipalities_in_Ontario)) - Markham is part of the Regional Municipality of York. - City of Markham: general maintenance, including installing new roof shingles on your home, does not require a building permit. ([source](https://www.markham.ca/about-city-markham/city-hall/bylaw/decks-construction-permits)) - Private Plumbing Protection Rebate Program: Rebates for backwater valve, weeping tile disconnection / sump pump and related devices; page also has downspout disconnection guidance. ([source](https://www.markham.ca/neighbourhood-services/water-sewer/basement-flooding-and-sewer-back-prevention)) > Before summer storm season, look at the drains and scuppers on your roof from a safe spot or in photos. Leaves and grit in a drain basket are the most common cause of water backing up under flashings. ## Starting prices in Markham | 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 Markham - [Condo buildings](https://flat-roof-repair.ca/property-types/condo-buildings/) - [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/) - [All property types](https://flat-roof-repair.ca/property-types/) ## Nearby cities - [Richmond Hill](https://flat-roof-repair.ca/locations/richmond-hill/) - [Vaughan](https://flat-roof-repair.ca/locations/vaughan/) - [Pickering](https://flat-roof-repair.ca/locations/pickering/) - [Greater Toronto Area](https://flat-roof-repair.ca/locations/greater-toronto-area/) ## Flat roofs in Markham: questions **How much does flat roof repair cost in Markham?** A small leak repair starts from $350 per repair and a new house flat roof starts from $8,000 per roof. Prices in Markham depend on access, layers to remove and the membrane. See [pricing](https://flat-roof-repair.ca/pricing/). **What causes most flat roof leaks in Markham?** 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 Markham?** City of Markham: general maintenance, including installing new roof shingles on your home, does not require a building permit. That wording is about shingles, so ask how it applies to a flat roof membrane. Rules can change, so confirm with the building department before you start. See [re-roofing permits in Ontario](https://flat-roof-repair.ca/guides/re-roofing-permits-ontario/). **My Markham 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 Markham?** Yes, including Richmond Hill, Vaughan, 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