🏠 Flat Roof Costs in Manitoba (2025)
What to Expect and How to Get It Done Right
Flat roofs are a common feature on commercial buildings, home additions, garages, and multi-family properties across Manitoba. But when it comes time for replacement, many property owners are unsure what a fair price looks like — or what’s really involved in getting the job done right.
At Prairie Roofing, we specialize in flat roofing systems designed specifically for Manitoba’s demanding climate. Below, we break down what to expect when budgeting for a flat roof in 2025, what impacts cost, and why using the right system — not shingles — is essential for long-term performance.
What Does a Flat Roof Cost?
Flat roofing in Manitoba typically costs between $8 and $15 per square foot, depending on the system used, the condition of the existing roof, and the project complexity.
Typical pricing ranges:
Garage or small addition: $5,000 – $10,000
Mid-sized residential or commercial flat roof: $12,000 – $30,000
Large commercial/institutional roof (6,000–10,000 sq ft): $50,000 – $90,000+
Repairs (membrane patching, seam sealing, flashing): $1,000 – $5,000+
What Factors Impact the Cost?
No two roofs are exactly alike, but most flat roofing quotes are influenced by the following:
Roof Size and Layout
Larger, open roofs are generally more efficient to install. Complex shapes, multiple levels, parapet walls, or rooftop HVAC units can add labour time.
Removal and Deck Repairs
If the old roof is damaged or leaking, we’ll need to remove it and assess the condition of the wood decking below. Deck repairs add cost — but are critical to long-term performance.
Material System
We install several types of flat roofing systems based on your building’s needs:
SBS Modified Bitumen (Torch-On): Ideal for Manitoba’s climate — tough, proven, and cost-effective.
EPDM Rubber: Flexible and long-lasting with excellent UV resistance.
TPO or PVC: Seam-welded single-ply systems often used in commercial and energy-efficient buildings.
Liquid Coatings: Sometimes used to extend the life of older systems or for targeted repair zones.
Insulation and Drainage
Flat roofs still need slope to ensure water runs off properly. We use tapered insulation and custom drainage designs to eliminate ponding water and comply with building code.
Why Shingles Shouldn’t Be on Flat Roofs
We often see flat roofs that were incorrectly covered with shingles — usually to save money upfront. Unfortunately, this approach almost always fails.
Here’s why:
Shingles require a minimum slope of 2:12
Flat or low-slope surfaces cause water to back up under the shingles
This leads to leaks, rot, and premature failure — often within just a few years
Shingle warranties do not cover flat applications
If your flat roof is leaking and currently has shingles, replacing it with a proper membrane system is the only long-term solution.
Why Choose Prairie Roofing?
We are a Manitoba-based roofing company with deep experience in residential and commercial flat roof systems. Our crew is trained, fully insured, and focused on delivering long-lasting, code-compliant installations with no shortcuts.
What sets us apart:
Accurate on-site inspections and quotes
In-house installation teams (no subcontractors)
Full warranty options on materials and workmanship
Long-term support and maintenance options
Systems designed for Manitoba’s freeze-thaw climate, snow load, and UV exposure
Request a Flat Roofing Quote
If you're considering a flat roof replacement or repair, contact Prairie Roofing for a free site visit and detailed estimate. We’ll assess your needs and recommend the right system for your building, budget, and long-term goals.