How much does commercial roof replacement cost in Canada?
Replacing a commercial roof is usually priced by the square foot of installed roof area, then adjusted for tear-off, deck repair, insulation, access, and membrane type. Flat low-slope systems (TPO, EPDM, modified bitumen) dominate Canadian commercial buildings, and the membrane you choose is the single biggest cost lever.
Typical price breakdown
General planning ranges for Canadian commercial work. Your actual price depends on scope, region, building condition, and access.
| Item | Typical range |
|---|---|
| EPDM (rubber) membraneMost economical single-ply; good lifespan in cold climates. | $8 – $14 / sq ft |
| TPO membraneEnergy-efficient white reflective surface; popular for retrofits. | $9 – $16 / sq ft |
| Modified bitumen (2-ply)Durable, torch- or self-adhered. | $10 – $17 / sq ft |
| Built-up roof (BUR / tar & gravel) | $11 – $19 / sq ft |
| Tear-off & disposal of old roofHigher with multiple existing layers or asbestos. | $1.50 – $4 / sq ft |
| Tapered insulation upgradeOften required to meet current code/drainage. | $2 – $6 / sq ft |
What moves the price
Roof size & sections
Larger continuous roofs cost less per square foot; many small sections and penetrations push the rate up.
Tear-off vs. recover
Removing old layers (and disposal) adds cost; a recover over a sound deck is cheaper but not always code-compliant.
Deck & structural repair
Rotted decking, drains, and parapet work discovered mid-job are common change-order drivers.
Access & occupancy
Crane staging, occupied buildings, and night/weekend work to avoid disruption raise labour cost.
Warranty tier
Manufacturer NDL warranties (15–30 yr) require certified installers and specific assemblies, adding to the bid.
How to get an accurate price
The numbers above are for budgeting. To get a real, scope-specific price, post your project as an RFP on PMRFP — describe the building, the work, and your region, and qualified roofing companies respond with their own pricing. Posting is free, and getting two or three competitive responses is the simplest way to know the true market rate.
Use the Flat Roof Replacement template
We’ve already built the scope, requirements, and evaluation criteria for this kind of project. Customize in seconds and post — go from cost guide to live RFP without writing from scratch.
Questions
PMRFP is a vendor discovery and RFP visibility platform. We do not guarantee project availability, bid success, contract awards, property manager response, or revenue. Members are responsible for their own due diligence, qualifications, insurance, licensing, pricing, and agreements.
Budgeting commercial roof replacement? Get real numbers.
Post your project on PMRFP and qualified Canadian trades respond with real, scope-specific pricing. Free to post.