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How Much Does a Roof Replacement Cost in London, Ontario? (2026 Guide)

  • Writer: Harman Singh
    Harman Singh
  • Apr 3
  • 2 min read

If you are a homeowner in London, St. Thomas, or Woodstock, "How much is a new roof going to cost?" is likely the first question on your mind.

In 2026, the average cost for a professional residential roof replacement in London, Ontario typically ranges between $8,000 and $18,000. However, for larger executive homes or complex commercial flat roofs, that number can vary significantly.

At Humble Roofing, we believe in transparency. Here is the breakdown of what is actually driving those numbers in our local market this year.

1. The Material Choice

The type of "hat" you put on your home is the biggest price factor:

  • Architectural Shingles: The most popular choice in Southwestern Ontario. Expect to pay between $5.50 and $7.50 per square foot installed.

  • Metal Roofing: A "lifetime" solution that handles Ontario snow beautifully. These typically start at $14.00 per square foot and can go higher for standing seam systems.

  • Flat Roofing (TPO/SBS): For commercial properties or residential garages, these specialized systems range from $8.00 to $14.00 per square foot due to the technical nature of heat-welding the membranes.

2. Roof Size and Complexity

Roofers measure in "squares" (100 square feet). A simple bungalow in Old North will cost less than a multi-gable two-storey home in Masonville, even if the square footage is similar. Steep pitches require extra safety equipment and more labor hours, which adds to the final estimate.


3. The "Hidden" Costs: Tear-offs and Repairs

When we pull back your old shingles, we sometimes find surprises:

  • Decking Repairs: Replacing rotted plywood typically costs $3 to $5 per square foot.

  • Multiple Layers: If your home has two layers of old shingles, they both must be removed to meet Ontario building codes. This adds roughly $1,000–$1,500 in extra labor and disposal fees.

  • Ventilation Upgrades: Proper attic ventilation is the only way to prevent ice dams in a London winter. Adding ridge vents or high-flow box vents is a small investment that doubles the life of your roof.

4. Why Local Expertise Matters

Southwestern Ontario faces unique weather—heavy snow loads, high winds, and rapid freeze-thaw cycles. A "cheap" roof often fails because it wasn't engineered for our climate. At Humble Roofing, we use manufacturer-certified systems from GAF and CertainTeed that include:

  • Enhanced Ice & Water shields in all critical valleys.

  • Synthetic underlayment that won't rot or tear.

  • A 10-year workmanship guarantee overseen personally by our owner.

Get a Precise Quote for Your Property

Ballpark figures are helpful, but every house is different. Whether you are in Byron, Lambeth, or Downtown London, we provide free, no-obligation inspections.

Ready to protect your home?

đź“ž Call Rajinder at +1 (519) 532-5273

📧 Email: info@humbleroofing.ca

 
 
 

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