Spray Foam vs Blown-In Insulation Cost: A Canadian Price Guide

When homeowners compare spray foam vs blown-in insulation cost, the gap can be surprising. Blown-in cellulose or fibreglass is usually the most affordable way to insulate, open-cell spray foam sits in the middle, and closed-cell spray foam is the premium option. The right choice is rarely about price alone, but knowing the real Canadian numbers helps you budget and decide where to spend. This guide gives honest per square foot ranges in CAD, walks through worked examples for an attic, a wall retrofit and a rim joist, and shows how rebates in Atlantic Canada and British Columbia can offset the cost.

For a full feature comparison beyond price, see our pillar guide on spray foam vs blown-in insulation. Greenfoot installs several types of insulation, so the figures below are not a pitch for one product. They are realistic estimates to help you plan.

How much does insulation cost per square foot in Canada?

Installed insulation pricing in Canada is usually quoted per square foot of area covered, at a target thickness or R-value. As a general guide for 2024 to 2025, here are realistic ranges across Atlantic Canada and BC:

• Blown-in cellulose or fibreglass: roughly 1.50 to 2.50 CAD per square foot installed, the most affordable option.
• Open-cell spray foam: roughly 1.50 to 3.00 CAD per square foot, depending on thickness.
• Closed-cell spray foam: roughly 3.50 to 7.00 CAD per square foot, the premium choice for high R-value and moisture control.

These are estimates, not quotes. Real prices move with the depth or R-value you need, how easy the space is to access, local labour rates, and current material costs. A wide-open attic floor is cheaper to cover than a cramped crawl space or a wall that must be drilled and filled. Always get a written, on-site quote for your home.

Why is blown-in insulation the most affordable option?

Blown-in insulation, usually cellulose or loose-fill fibreglass, is the budget champion for a few reasons. The materials are inexpensive, cellulose is largely recycled paper fibre treated for fire and pests, and the install is fast. A crew blows the loose fill through a hose to an even depth across an attic floor, often covering a large area in a few hours. Cellulose runs about R-3.5 to R-3.7 per inch and blown fibreglass about R-2.5 to R-3.5 per inch, so reaching a deep attic value such as R-50 to R-60 (recommended by Natural Resources Canada for our climate) is affordable when there is open access.

The trade-off is that loose-fill insulates but does not air seal on its own. In many projects the crew air seals top plates, penetrations and the attic hatch first, then blows in the insulation. That added sealing is modest in cost and makes the blown-in layer perform far better. To learn more about the product, see our blown-in insulation service.

Why does closed-cell spray foam cost more?

Closed-cell spray foam carries the highest price for honest reasons, not just markup:

• Higher R-value per inch: at about R-6 to R-7 per inch, closed-cell delivers more performance in less space, which matters in tight wall cavities and rim joists.
• Two-component chemistry: the foam is made on site by precisely mixing two liquids at the right temperature and ratio. The equipment, heated hoses and material are costly.
• Certified installers and protective gear: spray foam must be installed by trained, certified applicators following the CAN/ULC standards, with proper ventilation and safety equipment.
• Built-in air and vapour control: closed-cell foam air seals and acts as a vapour barrier in one step, which can remove the cost of a separate poly barrier in some assemblies.

Open-cell spray foam is lighter and less dense, so it costs less than closed-cell while still air sealing well. It runs about R-3.6 to R-3.9 per inch and is often used in interior walls and ceilings where moisture control is less critical. For help deciding where foam earns its price, read when to use spray foam instead of blown-in.

What does it cost to insulate a typical attic?

Consider a common Canadian attic floor of about 1,000 square feet that needs a top-up to roughly R-60. Blown-in cellulose or fibreglass is almost always the right call here because the space is open and you want depth, not density.

At roughly 1.50 to 2.50 CAD per square foot installed, a 1,000 square foot attic top-up lands around 1,500 to 2,500 CAD before any rebate, plus a modest charge for air sealing the attic and hatch. Doing the same attic with spray foam would cost several times more for no real comfort gain, which is why foam is rarely used to fill an open attic floor.

What about a wall retrofit or a rim joist?

Wall retrofit: in an older home with empty wall cavities, dense-pack blown-in cellulose can be injected through small holes (the drill and fill method) at roughly 2.00 to 3.50 CAD per square foot of wall, including patching. For a single wall of about 300 square feet, that is roughly 600 to 1,050 CAD. Closed-cell foam in walls is reserved for cases that need the highest R-value or moisture control, because the price climbs quickly.

Rim joist: the band where the floor framing meets the foundation is a notorious source of cold drafts and condensation. This is where closed-cell spray foam shines. A typical rim joist project covers a smaller area, often 150 to 250 square feet of surface, but at the closed-cell rate of 3.50 to 7.00 CAD per square foot it usually lands in the few hundred to roughly 1,000 CAD range. The high per foot cost is worth it because the foam stops air leakage and protects against the damp coastal air common in Atlantic Canada and parts of BC.

What else affects your insulation quote?

Two homes of the same size can receive very different quotes. Beyond the product and target R-value, the factors that move the price most are:

• Access: a wide attic hatch and good headroom keep labour low, while a cramped crawl space or a tight attic slows the crew and raises cost.
• Prep work: air sealing, baffles to protect soffit vents, and dam boxes around the hatch and light fixtures add modest but worthwhile cost.
• Removal of old material: if existing insulation must come out first, that is a separate line item on top of the new install.
• Season and demand: busy heating-season schedules and travel to rural areas in Atlantic Canada and BC can affect pricing and lead time.

Because of these variables, the only accurate number is a written, on-site quote. A good contractor will measure the area, confirm the target R-value, and itemize prep, product and any removal so you can compare fairly.

Do rebates lower the cost of insulation?

Yes, often significantly. While the federal Canada Greener Homes Grant is now closed to new applicants, provincial programs still help offset insulation upgrades. Efficiency Nova Scotia, Efficiency PEI, the New Brunswick Total Home Energy Savings Program, takeCHARGE in Newfoundland and Labrador, and CleanBC Better Homes all offer rebates for attic, wall and basement insulation that meet their requirements.

Rebate amounts are usually tied to the area insulated and the R-value added, so a deep attic top-up can recover a meaningful share of the cost. Check your province for current amounts: Nova Scotia, New Brunswick, PEI, Newfoundland and Labrador, and British Columbia. For a deeper look at programs and how they stack, read our guide to insulation rebates in Atlantic Canada and BC.

The bottom line: blown-in insulation gives the best raw value per dollar, while closed-cell spray foam costs more but earns its price in tight, damp or hard-to-seal areas. Most homes are best served by a mix, and a free assessment is the only way to get accurate numbers for your house.