If your flat roof in Toronto is showing signs of damage, one of the first decisions you’ll need to make is whether to repair or replace it. While repairs are usually less expensive upfront, they may not be the most cost-effective solution in the long run—especially if the roof is older or has recurring issues. Understanding the cost comparison between flat roof repair and full replacement will help you make the smartest choice for your property.
Flat roof repairs are typically the go-to option when the damage is minor or localized. Repairs can address common issues such as cracks, punctures, ponding water, or loose flashing. In Toronto, average repair costs range from $500 to $3,000, depending on the size of the problem and the roofing system involved. For example, a small membrane patch might cost a few hundred dollars, while extensive flashing repairs or slope correction could cost more.
Repairs are generally faster to complete and cause minimal disruption. They’re ideal when the rest of the roof is in good shape and has several years of life left. However, if repairs are being done frequently or if leaks keep returning, the total cost of ongoing fixes can quickly add up. At that point, a full replacement may be the more economical option.
Flat roof replacement, while more expensive upfront, offers longer-lasting value and better protection. Replacing a flat roof in Toronto typically costs between $7,000 and $20,000, depending on the size of the roof, the materials used, and whether the old roofing layers need to be removed. High-performance membranes like TPO or modified bitumen will cost more, but they also offer enhanced durability, UV resistance, and energy savings.
Another factor is the number of existing roofing layers. If your roof already has two or more layers, Toronto building code may require a full tear-off, which adds to the cost.
Warranty is also worth considering. Most repairs come with a short-term warranty, typically 1–5 years, while replacements often include manufacturer-backed warranties of 15 to 30 years when installed by certified professionals. This alone can offset the initial cost difference, especially for property owners planning to hold onto their building long-term.
Ultimately, your decision should be based on a professional assessment. A flat roof expert can evaluate your current system, check for hidden moisture damage, and advise whether targeted repairs or full replacement makes the most sense.
If you’re unsure which route to take, start with an inspection from Flat Roof Repair Toronto. Their experienced team offers both comprehensive flat roof repair and reliable residential flat roof replacement options, helping you make the most cost-effective decision for your home or building.