What Spray Foam Costs Here
Spray foam is priced by the board foot — one square foot at one inch thick. In the Thorold area, open-cell foam runs about $0.50–$1.00 per board foot installed and closed-cell about $1.50–$2.50+ per board foot. Closed-cell costs more because it packs a higher R-value per inch and acts as its own vapour barrier — the reason it's the go-to for basements, crawlspaces and rim joists in our climate. What you actually pay comes down to how much area you're covering, how thick the foam needs to be to hit your R-value, and whether old insulation has to come out first.
Typical Thorold Project Prices
- Attic re-insulation — roughly $3,000–$7,000 depending on size, foam type and R-value target
- Rim joist & header seal — often $1,000–$2,500, one of the best-value jobs in an older home
- Basement / foundation walls — commonly $3,000–$8,000 for closed-cell, by size
- Crawlspace — typically $2,000–$5,000 depending on access and area
- New build / addition — quoted per square foot once framing and R-value targets are set
What Changes the Price
A few things move the number up or down on a Thorold home. Foam type is the biggest lever — closed-cell costs more than open-cell but does more in less depth. Removal of wet, mouldy or compacted old insulation adds labour before we can spray. Access matters too: a tight crawlspace or a cut-up attic takes longer than an open one. And your R-value target — Ontario code aims for about R-60 in attics — sets how much foam goes in. We walk through all of it on the quote so there are no surprises.
Rebates Can Lower It
Spray foam is one of the upgrades most likely to qualify for federal and Ontario home-energy rebates, which can take a meaningful bite out of the cost. The specific programs and amounts change year to year, so we tell you which current rebates your attic, basement or crawlspace project is likely to qualify for when we quote it.
Get an Exact Number — Free
The ranges above are typical for Thorold, but the only way to know your price is to look at the space. We give you a firm, upfront quote with no obligation. Explore the specific jobs on our attic spray foam and closed-cell foam pages, then call for your number.
Spray Foam Cost Thorold FAQ
How much does spray foam insulation cost in Thorold?
Open-cell runs about $0.50–$1.00 per board foot and closed-cell about $1.50–$2.50+ installed. A typical attic lands around $3,000–$7,000; a rim-joist seal is often $1,000–$2,500. Your free quote gives an exact number.
Why is closed-cell more expensive than open-cell?
It uses more material and delivers higher R-value per inch plus a built-in vapour barrier — the right choice for basements, crawlspaces and rim joists here, even at a higher price.
Are there rebates that lower the cost?
Often yes. Federal and Ontario home-energy programs regularly cover spray foam upgrades. We point you to the current rebates your project is likely to qualify for.
Will you give me an exact price?
Yes — a firm, upfront number after we see the space, free and with no obligation. The ranges here are just typical Thorold-area figures.