Flat roofing · Toronto & York Region
Flat Roof Repair & Replacement in Toronto
Flat and low-slope roofs for rear additions, garages, semis, row houses and commercial buildings across Toronto and York Region.
★★★★★ 5.0 on Google (75 reviews) · 4.9 on HomeStars (175 reviews)
Since 1986
Family-run by the Spiros family
25,000+ installs
Roofs and exteriors across the GTA
265+ Reviews
5.0 Google · 4.9 HomeStars
100% Canadian
Local crew, no call centre
Flat Roof Repair & Replacement
Flat roofs need a different system
Shingles only work when water runs off fast. On a flat or low-slope roof the water sits, so it needs a membrane that’s sealed at every seam and edge. We use modified bitumen systems for most flat roofs, with proper drainage, flashing up the walls and edge metal.
The weak spots on most flat roofs are where they meet something else: a parapet, a wall, a skylight, or the main pitched roof. That’s where we focus.
- Modified bitumen flat roofs
- Repairs to blisters, splits and seams
- Wall and parapet flashing
- Drains, scuppers and edge metal
- Residential and commercial
Know the signs
Signs your flat roof needs work
Call us if you notice any of these. Catching it early usually means a smaller bill.
- Water pooling for days after rain
- Blisters, bubbles or cracks in the membrane
- Seams lifting at the edges
- Leaks where the flat roof meets a wall
- Soft spots when you walk on it
Why Spiros
Why homeowners and businesses choose us
Family-run since 1986
The family started the company in 1986 and still runs every job. You deal with the people who own the business.
25,000+ roofs and exteriors
Four decades of work across Toronto and York Region, from custom homes and estates to commercial buildings.
Trusted on landmark projects
We re-roofed several buildings at Canada’s Wonderland and roof new custom homes for builders across York Region.
Clear written quotes
Scope, materials and price in writing before work starts. Reviewers regularly mention clear, fair pricing.
On schedule, clean site
Customers mention crews arriving on the date promised and leaving the property spotless.
265+ Reviews
5.0 Google · 4.9 HomeStars
How it works
How the job runs
01
Call or book online
Tell us what you’re seeing: a leak, missing shingles, an old roof. We book a time that suits you.
02
Inspection
We check the roof, flashing, vents and eavestroughs, look in the attic where we can, and take photos.
03
Written quote
You get the scope, materials and price in writing and time to think it over.
04
The job and clean-up
We protect the house and yard, do the work, and clean the site before we leave.
Service area
Where we work
From our office in Richmond Hill we cover Toronto and York Region, north to Bradford and Innisfil.
Questions
Flat Roof Repair & Replacement questions
A well-installed modified bitumen roof commonly lasts 15 to 20 years or more, depending on drainage and maintenance.
Often. Blisters, split seams and failed flashing can be repaired if the rest of the membrane is sound.
Usually because the roof has settled or wasn’t sloped to the drain properly. We can add tapered insulation or rework the drains when we replace it.
Yes, including industrial and commercial buildings across Vaughan, Richmond Hill and Toronto.
Flat roofs in the GTA usually cost $5 to $17 per square foot in 2026, depending on the system and how easy the roof is to reach. A garage or rear-addition flat roof is often a few thousand dollars.
For homes and smaller commercial buildings, 2-ply modified bitumen is a proven choice in Ontario. The two reinforced layers give you a backup if the top one gets damaged, and it handles freeze-thaw cycles well.
Reviewed by the Spiros Aluminum & Roofing family team, roofing in the GTA since 1986. Have another question? See our Roofing FAQ.
Talk to the family team
Call 416-286-7759 or send us a few details and we’ll book an inspection.