Essential Guide to Roof Replacement Cost in Ontario

Roof replacement cost in Ontario is something every homeowner will encounter eventually. Your roof is your home’s first line of defence against the elements, shielding everything inside from weather like wind, rain, snow, and deep freezes. Over time, even the best roofing systems wear down due to age, weather damage, or poor ventilation.

When that time comes, replacing your roof goes beyond replacing curling shingles. It protects your home, improves efficiency, and helps avoid future issues.

But how much does it actually cost to replace a roof in Ontario?

The short answer: it depends. Factors like the size of your roof, the material you choose, and the complexity of the installation all impact the final cost. In this guide, we’ll break down the elements that influence roof replacement cost in Ontario, so you can budget confidently and make an informed decision. For a full look at what’s included and how the process works, visit our roofing services in Hamilton page.

What factors affect average roof replacement cost in Ontario?

Many factors come into play when calculating roof replacement cost in Ontario. They include the type of material you choose, the size of your home, and the complexity of the installation. Let’s break down each element in detail below.

Roofing cost breakdown by material

The type of roofing material you choose will have a major effect on your total investment. Here are some common options:

• Asphalt shingles: The most popular roofing material in Ontario. Affordable, easy to install, and available in a variety of colours. Cost: $4.50 to $7.00 per square foot installed.
  
• Metal roofing: Known for its durability and long lifespan. Resistant to fire, mildew, and insects. Ideal for homes in snowy or high-wind regions. Cost: $9.00 to $16.00 per square foot installed.
  
• Synthetic or slate roofing: High-end options with unmatched longevity and curb appeal. Best suited for luxury homes. Cost: $20.00+ per square foot installed.

Each material has its own benefits and lifespan, so consider both the upfront and long-term value when making your choice. If you’re weighing options, you may find our breakdown of the best roof shingles in Canada helpful.

Roof replacement cost of labour

Labour typically makes up 40–60% of your total roof replacement cost. Trained professionals ensure proper installation, ventilation, and waterproofing. These are key factors in protecting your home and preserving warranties.

Labour costs depend on:

• Roof pitch and steepness
  
• Layers being removed
  
• Roof height and accessibility
  
• Roof complexity (peaks, valleys, skylights)

Average range: $2.50 to $5.00 per sq. ft.

Removal and disposal of old roofing

If your existing roof needs to be removed, additional costs apply for:

• Tearing off shingles
  
• Inspecting underlayment
  
• Disposing of old materials

Estimated cost: $1,000 to $3,000, depending on roof size and layers

Roof size and complexity

Larger and more complex roofs require more labour, materials, and time.

General estimates:

• Small homes (under 2,000 sq. ft.): $6,000 – $10,000
  
• Medium homes (2,000–3,000 sq. ft.): $10,000 – $15,000
  
• Large homes (3,000+ sq. ft.): $15,000 – $20,000+

Add-ons like chimneys, dormers, or multi-level roofing can increase complexity.

Additional features and upgrades

Upgrades can enhance your roof’s performance and energy efficiency, but also impact your roof replacement cost:

• Underlayment: A protective barrier installed beneath your shingles that helps prevent water infiltration and roof deck damage
  
• Improved ventilation: Reduces moisture buildup and heat retention, extending your roof’s lifespan
  
• New flashing or eavestroughs: Often replaced during roof upgrades to ensure watertight protection
  
• Insulation upgrades: Increases energy efficiency and indoor comfort year-round

While these add-ons may increase your upfront cost, they offer significant long-term savings and protection.

DIY roof replacement vs. professional installation

While DIY might seem like a cost-saver, roofing is not a job for beginners. Improper installation can lead to:

• Major leaks
  
• Voided warranties
  
• Structural issues
  
• Serious injury

Professional installation offers:

• Correct waterproofing and underlayment
  
• Warranty protection
  
• Proper flashing and ventilation
  
• Long-term peace of mind

At Gateway Exteriors, our certified crews ensure every roof meets industry standards.

How to get the best value for a new roof cost Ontario

Here are 4 key ways to maximize your investment in Ontario:

1. Get multiple quotes from trusted, local contractors.
   
2. Verify references and reviews before committing.
   
3. Ask about warranties on both materials and labour.
   
4. Don’t choose based on price alone; experience and service matter.
   

At Gateway Exteriors, we offer free estimates, flexible financing, and workmanship backed by warranties that reflect the care we bring to every install.

Roof replacement cost in Ontario: FAQs

Have more questions about roof replacement cost in Ontario?

For more information on roofing systems, visit the GAF Roofing Guide for Homeowners.

You’ll find helpful insights tailored to Ontario homeowners looking to make informed decisions about their next roof replacement.

Need a roof replacement? Contact Gateway Exteriors in Hamilton, ON

If you’re planning to replace your roof, don’t leave it to chance. At Gateway Exteriors, we help homeowners across Ontario protect and enhance their homes with high-quality roofing systems customized to their needs and budget.

No matter the material, our team scopes the work clearly, sets expectations, and keeps things on track. Get a clear quote and expert advice on what your roof actually needs.