If you’re a homeowner in Toronto, Ottawa, or anywhere across Ontario wondering about spray foam insulation costs, you’re asking the right question before winter hits. Understanding the investment helps you budget properly and avoid surprise charges from contractors who aren’t transparent about pricing.

What Is the Average Cost of Spray Foam Insulation in Ontario?

In 2026, spray foam insulation costs in Ontario range from $1.75 to $6.00 per square foot depending on several factors. The GTA and Toronto typically see prices at the higher end of this range due to labor costs and material transportation.

Here’s the breakdown by foam type:

Open-Cell Spray Foam: $1.50 – $2.50 per square foot
Lower R-value per inch (approximately R-3.5 to R-4 per inch)
Best for interior walls and sound dampening
Allows moisture to pass through, preventing mold buildup

Closed-Cell Spray Foam: $2.75 – $4.50 per square foot
Higher R-value (approximately R-6 to R-7 per inch)
Acts as a vapor barrier
Ideal for basements, crawl spaces, and exterior applications
Provides structural reinforcement

What Factors Affect Spray Foam Insulation Costs in Toronto and the GTA?

1. Area Size and Accessibility

Larger projects benefit from economies of scale. A 2,000 square foot attic costs less per square foot than a 200 square foot crawl space. Hard-to-reach areas like tight crawl spaces or high cathedral ceilings require specialized equipment and increase labor time.

2. Foam Thickness and R-Value Requirements

Ontario’s building code requires specific R-values:
Attics: Minimum R-50 to R-60
Exterior walls: Minimum R-20 to R-24
Basements: Minimum R-10 to R-20

Thicker applications mean more material and higher costs, but also better energy efficiency. Learn more about closed-cell spray foam for maximum R-value.

3. Preparation and Removal

If you’re removing old insulation (fiberglass, cellulose, or damaged foam), add $1.00 to $3.00 per square foot for removal and disposal. Mold remediation, if needed, is a separate cost entirely. Contact Spray Foam Kings for professional removal services.

4. Seasonal Timing

Winter installations in Ontario can be 10-15% more expensive due to equipment heating requirements and challenging conditions. Book in spring or fall for better rates. Contact us to schedule your consultation.

Is Spray Foam Insulation Worth the Cost in Ontario?

Absolutely. Here’s why Ontario homeowners consistently see returns:

Energy Savings: With Ontario hydro rates among the highest in Canada, spray foam’s superior air sealing reduces heating and cooling costs by 30-50% annually. Most homeowners recoup their investment in 3-5 years. Explore our energy efficiency solutions.

Enbridge HER+ Rebates: Ontario homeowners qualify for up to $10,000 in rebates through the Enbridge Home Efficiency Rebate Plus program when upgrading insulation. This significantly offsets upfront costs. Visit our rebates page to learn more.

Longevity: Unlike fiberglass that settles and degrades, spray foam maintains its R-value for the lifetime of your home—25+ years. Check out our blog for more insulation tips.

Pest and Moisture Control: Closed-cell foam creates an impenetrable barrier against Ontario’s common pests (mice, raccoons) and prevents moisture issues that plague basements and attics.

How Can You Get an Accurate Spray Foam Quote in Ontario?

Don’t settle for phone estimates. A professional spray foam contractor should:

Conduct an on-site assessment of your attic, basement, crawl space, or walls
Identify air leaks using thermal imaging
Explain R-value requirements specific to your municipality’s building code
Provide itemized pricing including preparation, materials, labor, and cleanup
Detail warranty coverage (reputable contractors offer lifetime warranties)
Assist with rebate applications including Enbridge HER+ paperwork

Questions to Ask Your Ontario Spray Foam Contractor

Before signing any contract, verify:

Are you licensed and insured in Ontario?
What certifications do your installers hold?
Can you provide local references in Toronto/the GTA?
What’s included in your warranty?
Will you handle the Enbridge rebate application?
What preparation is required from me?

Get Your Free Spray Foam Insulation Estimate in Ontario

Spray Foam Kings has insulated thousands of homes across Toronto, Ottawa, Hamilton, and throughout Ontario. We provide transparent, no-surprise pricing and handle all Enbridge HER+ rebate paperwork for you.

Call us today at (647) 952-2537 or visit sprayfoamkings.ca to schedule your free in-home assessment. Don’t let another Ontario winter drain your wallet—insulate smart, save forever.