---
title: "Flat Roof Repair in Toronto, ON | flat-roof-repair.ca"
description: "Flat roof leak repair, replacement and maintenance in Toronto, Ontario, for houses, condos and commercial buildings. Drains and flashings for heavy summer storms."
url: https://flat-roof-repair.ca/locations/toronto/
last_updated: 2026-10-23
---

# Flat roof repair in Toronto

We repair, replace and maintain flat roofs in Toronto: 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 Toronto

Toronto has many mid- and high-rise buildings, whose flat roofs are managed by condo boards and property managers. The usual work is drains, flashings at mechanical units and planned replacements. 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/).

## Rowhouse streets, converted factories and tower blocks in Toronto

Toronto grew in layers. The town of York was founded in 1793, and by the late 1800s rail and port facilities pulled industry onto the waterfront, where it stayed for about a century. That legacy shows in areas such as Corktown, Leslieville and the Distillery District, where former industrial buildings sit beside Victorian houses. Census figures say about 58% of the city's dwellings were built before 1981 and roughly 29% before 1961.

In older neighbourhoods like Cabbagetown and the Annex you often find a flat or low-slope roof over a rear kitchen addition or a porch on a brick house. The population doubled between 1951 and 1971, and that postwar building left many low-rise plazas, schools and apartment blocks with membrane or built-up flat roofs. In the Port Lands and other industrial pockets, large commercial and warehouse buildings add a different scale of low-slope roofing. Nearly half of homes are in apartment buildings of five storeys or more, so roof access and drainage are often a building-management matter.

## Toronto 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 Toronto has to handle. Figures are for Toronto City Hall; SB-1 lists Etobicoke, North York and Scarborough separately with similar values.

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## Homes and buildings in Toronto

The age and type of buildings shape the flat roofs we see. These are the 2021 Census figures for Toronto.

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## Storms that hit Toronto

- 8 July 2013: Two thunderstorm systems merged on 8 July 2013 and caused widespread flooding and power outages in Toronto, with up to 126 mm of rain in about 90 minutes. ([source](https://en.wikipedia.org/wiki/History_of_flooding_in_Canada))
- December 2013: A major ice storm struck Toronto in December 2013, with a second, stronger wave of freezing rain in the early morning of 22 December. ([source](https://en.wikipedia.org/wiki/December_2013_North_American_ice_storm))

## Toronto: facts for property owners

- Population of Toronto: 2,794,356 (2021 Census). ([source](https://en.wikipedia.org/wiki/List_of_municipalities_in_Ontario))
- City of Toronto: no building permit is needed for 'replacing existing roofing material provided no structural work is required'; permits are needed for structural work and for green roofs / rooftop stormwater retention systems. ([source](https://www.toronto.ca/services-payments/building-construction/building-permit/before-you-apply-for-a-building-permit/when-do-i-need-a-building-permit/))
- Mandatory Downspout Disconnection Program: City program requiring connected downspouts to be disconnected; financial assistance up to $500 for eligible low-income seniors / persons with disabilities. ([source](https://www.toronto.ca/services-payments/water-environment/managing-rain-melted-snow/basement-flooding/mandatory-downspout-disconnection/))
- Basement Flooding Protection Subsidy Program: Expanded May 1, 2026: up to $6,650 per property for assessment, backwater valves, sump pump, and severance/capping of storm or weeping-tile connections. ([source](https://www.toronto.ca/services-payments/water-environment/managing-rain-melted-snow/basement-flooding/basement-flooding-protection-subsidy-program/))
- Eco-Roof Incentive Program: Applications open: green roof $100/m² (up to $100,000), cool roof $5/m² for new membrane or $2/m² for coating over existing roof (up to $50,000); apply before starting roof work. ([source](https://www.toronto.ca/services-payments/water-environment/environmentally-friendly-city-initiatives/green-your-roof/))
- Toronto Green Roof Bylaw: City bylaw requiring green roofs on new buildings above a gross floor area threshold. ([source](https://www.toronto.ca/city-government/planning-development/official-plan-guidelines/green-roofs/))

> 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 Toronto

| Item | Starting price |
|---|---|
| [Commercial roof inspection and report](https://flat-roof-repair.ca/services/flat-roof-inspection/) | from $450 per roof |
| [Roof drain or scupper repair](https://flat-roof-repair.ca/services/roof-drains-and-scuppers/) | from $800 per drain |
| [Commercial roof replacement](https://flat-roof-repair.ca/property-types/condo-buildings/) | 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/).

## Roofs we work on in Toronto

- [Condo buildings](https://flat-roof-repair.ca/property-types/condo-buildings/)
- [Apartment buildings](https://flat-roof-repair.ca/property-types/apartment-buildings/)
- [Garages and additions](https://flat-roof-repair.ca/property-types/garages-and-additions/)
- [Houses](https://flat-roof-repair.ca/property-types/houses/)
- [All property types](https://flat-roof-repair.ca/property-types/)

## Nearby cities

- [Mississauga](https://flat-roof-repair.ca/locations/mississauga/)
- [Vaughan](https://flat-roof-repair.ca/locations/vaughan/)
- [Markham](https://flat-roof-repair.ca/locations/markham/)
- [Greater Toronto Area](https://flat-roof-repair.ca/locations/greater-toronto-area/)

## Flat roofs in Toronto: questions

**How much does flat roof repair cost in Toronto?**

A small leak repair starts from $350 per repair and a new house flat roof starts from $8,000 per roof. Prices in Toronto depend on access, layers to remove and the membrane. See [pricing](https://flat-roof-repair.ca/pricing/).

**What causes most flat roof leaks in Toronto?**

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 Toronto?**

City of Toronto: no building permit is needed for 'replacing existing roofing material provided no structural work is required'; permits are needed for structural work and for green roofs / rooftop stormwater retention systems. 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/).

**Do you work with condo boards in Toronto?**

Yes. We send a written scope, photos and a quote the board can compare, and can split work into phases. See [planning a condo roof project](https://flat-roof-repair.ca/guides/condo-roof-planning/).

**Do you also work near Toronto?**

Yes, including Mississauga, Vaughan, Markham 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/)

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Get a quote: https://flat-roof-repair.ca/request-a-quote/ · Email: info@flat-roof-repair.ca