How much do contractors charge for basement insulation spray foam in New Brunswick?

Spray foam basement insulation in New Brunswick typically runs $3,000–$8,000+ for an average home, depending heavily on the size of your basement, the type of foam used, and how much prep work is involved.

Here's how the pricing breaks down in the NB market:

Closed-cell vs. open-cell foam is the biggest cost driver. Closed-cell spray polyurethane foam (SPF) runs roughly $1.50–$3.50 per board foot installed, while open-cell is cheaper at $0.75–$1.50 per board foot. For a typical NB basement — say 1,000–1,200 sq ft of wall and rim joist area — expect:

• Low end (~$3,000–$4,500): Open-cell foam on walls and rim joists, straightforward access, newer home
• Mid range (~$4,500–$6,500): Closed-cell on rim joists (standard practice) with open-cell on walls, average 1970s–1990s bungalow
• High end ($6,500–$10,000+): Full closed-cell application, older home with irregular framing, stone or rubble foundation, significant prep required

Rim joists deserve special attention in New Brunswick homes. That band of framing right at the top of your foundation wall is one of the biggest sources of heat loss and cold air infiltration — especially in the post-war bungalows and split-levels common in Riverview, Quispamsis, and New Maryland. Most contractors will prioritize closed-cell foam here (minimum 2 inches, ideally 3–4 inches) because it acts as both insulation and an air/vapour barrier in one shot.

For older Saint John or Fredericton homes with stone foundations from the 1800s or early 1900s, pricing climbs quickly — irregular surfaces require more foam to achieve consistent coverage, and contractors may charge a premium for the extra time and material.

A few things that affect your final quote: basement ceiling height, whether there's existing insulation to remove (fibreglass batts in contact with a cold foundation wall are notorious for moisture problems and often need to come out first), access for the spray rig, and travel time if you're in a rural area. Contractors in northern NB (Bathurst, Campbellton, Edmundston) may factor in longer travel if specialized crews are coming from larger centres.

On the rebate side, the Canada Greener Homes Grant closed in 2024, but NB Power's Total Home Energy Savings Program offers rebates for insulation upgrades in qualifying homes — worth checking before you book, as this can offset a meaningful portion of your cost. Visit nbpower.com or call NB Power to confirm current eligibility.

Spray foam is a professional job — the two-component chemicals require specialized equipment, proper PPE, and the space needs to be vacated during application and for several hours after curing. This is not a DIY project, and the results from an improperly mixed application (wrong ratio, wrong temperature) can mean poor insulation performance or adhesion failure.

Your best next step is to get two or three quotes from licensed insulation contractors in our directory at the New Brunswick Construction Network. Ask each contractor to specify the foam type, thickness, and R-value they're proposing — a good closed-cell application on rim joists should hit R-20 or better, and NB's cold winters (regularly hitting -25°C inland) make that investment pay back faster than you might expect.