Moderate 1-3 days for replacement $5,000-$15,000 CAD typical

When to Replace Your Roof

Know the signs that your roof needs replacement and how to plan for this major investment.

5 Signs You Need a New Roof

This Old House · 1.5M+ views

What This Video Covers

The five key warning signs your roof needs replacing
How to inspect your roof safely from the ground
What to look for in the attic — water stains, daylight, and mould
Understanding roof lifespan by material type

Safety Warnings

Never walk on a wet, icy, or steep roof. Falls from roofs cause serious injuries and fatalities every year.
Do not attempt DIY roof repairs beyond replacing a single damaged shingle. Leave structural work to professionals.
Ensure your roofer has fall protection equipment and follows Ontario occupational health and safety standards.

Step-by-Step Guide

Know your roof's age

Asphalt shingle roofs last 20-25 years, metal roofs 40-70 years, and cedar shakes 20-30 years. If your roof is approaching its expected lifespan, start planning for replacement.

Inspect from the ground

Look for curling, cracking, or missing shingles. Check for sagging areas or visible daylight through the roof deck. Notice any granules in your gutters (a sign of shingle deterioration).

Check the attic interior

Look for water stains, mould, or daylight coming through the roof boards. Check for proper ventilation. Poor ventilation shortens roof life significantly.

Get a professional inspection

Hire a ProScore-verified roofer to do a thorough inspection. They can identify issues invisible from the ground, including flashing failures, ice dam damage, and underlayment breakdown.

Understand your options

You may be able to do a roof-over (new shingles over old) if you have only one layer. A full tear-off is required if you have two layers or significant deck damage. Discuss both options with your roofer.

Get multiple quotes

Get 3+ quotes from ProScore-verified roofers. Ensure quotes include: material type/brand, tear-off vs overlay, ventilation upgrades, flashing replacement, cleanup, and warranty terms.

Plan for the project

Roof replacement takes 1-3 days for most homes. Plan for noise, debris, and limited driveway access. Inform your neighbours and remove vehicles from the area. Check if a building permit is required.