Roof replacement cost › Markham
York Region · 2026
How much does a roof replacement cost in Markham?
Most Markham homeowners pay $14,000–$24,000 plus HST for a full asphalt roof replacement in 2026, and typically $15,500–$21,000 for an average detached home — varying with the area’s mix of newer subdivisions and older Unionville homes.
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Cost by shingle type in Markham
Typical detached roof surface: roughly 1,900–2,800 sq ft once slope is counted.
| Shingle type | Example | Per sq ft (installed) | Lifespan |
|---|---|---|---|
| 3-tab / basic asphalt | entry-level, flat look | $3.50–$5.50 | 12–22 yrs |
| Architectural (laminated) | IKO Cambridge · GAF Timberline HDZ | $6.00–$10.50 | 25–35 yrs |
| Designer / impact (Class 4) | IKO Nordic · GAF UHDZ | $9.00–$12.00 | 35–50 yrs |
Typical full replacement on an average Markham detached home: $15,500–$21,000 + HST. Most Markham roofs fall in the $14,000–$24,000 band; the exact number depends on your roof’s size, pitch, layers and complexity — which is why we price from your address, not an average.
What drives the price in Markham
Markham mixes large 1990s–2010s subdivisions in Cornell, Wismer and Berczy with older, character homes in historic Unionville and Thornhill. The newer-subdivision roofs are big and steep; the older Unionville homes are more likely to hide aging decking, so the cost driver depends a lot on which Markham you live in.
- Newer Cornell/Wismer/Berczy homes have steeper, multi-facet roofs that add labour.
- Historic Unionville homes are more likely to need partial decking replacement.
- York Region winters make eave ice-and-water membrane and ventilation worth confirming.
Common roof issues in Markham
Aging decking in historic Unionville
Older Markham homes can hide plank or thin plywood decking — priced per sheet and only when found, with your approval.
Ice damming on north-facing slopes
York Region cold drives ice dams; membrane coverage at the eaves and balanced ventilation are the durable fix.
Permits in Markham
A like-for-like asphalt re-roof in Markham does not require a building permit. The City of Markham Building Department only requires one for structural changes, decking replaced beyond repair, or added/relocated skylights — note heritage-designated Unionville properties may have additional review.
Markham areas we serve
Unionville · Cornell · Wismer · Berczy · Markham Village · Thornhill · Cathedraltown
Markham roof cost FAQ
How much does a roof replacement cost in Markham in 2026?
Most Markham homeowners pay $14,000–$24,000 plus HST for a full asphalt roof replacement in 2026, and typically $15,500–$21,000 for an average detached home — varying with the area’s mix of newer subdivisions and older Unionville homes.
What is the most common surprise cost on a Markham roof?
Replacing rotted decking under the shingles is the number-one concealed cost — and the most-abused change order. It is invisible until the old roof is off. An honest quote names a fixed per-sheet deck rate up front and only charges for what is actually rotted, with a photo you approve.
Why is so much of a Markham roof replacement labour?
On a typical GTA re-roof, labour is 50–60% of the total and materials are the smaller half. Roofing is heavy, fall-risk, weather-exposed work, and the crew is what makes a roof last. A price far below market usually means corners cut on the crew or on what you can’t see.
Does a heritage home in Unionville need special approval to re-roof?
A standard re-roof usually does not, but heritage-designated properties in Unionville can have additional review on visible materials and colour. We confirm any heritage requirements before scheduling.
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Get my planning range →Related: GTA roof replacement cost guide · Repair or replace? · Financing