How much does it cost to insulate a full Calgary basement with rigid foam?

Insulating a full Calgary basement with rigid foam board typically costs between $2,000 and $5,500 for materials and labour, depending on the basement's perimeter length, the thickness of foam used, and whether you're doing it yourself or hiring a contractor. This covers the rigid foam component only — framing, additional batt insulation, vapour barrier, and drywall are separate costs that bring the total wall assembly higher.

For a typical Calgary basement with roughly 140 to 180 linear feet of foundation wall and walls averaging 8 feet tall (1,120 to 1,440 square feet of wall area), here's how the numbers break down. XPS rigid foam board at 2 inches (R-10) costs $1.25 to $2.50 per square foot installed in Calgary, putting the rigid foam portion at roughly $1,400 to $3,600. However, 2 inches of XPS alone provides only R-10, which falls short of the Alberta Building Code minimum of R-20 for below-grade walls. You'll need to supplement with batt insulation between studs — either mineral wool at $1.50 to $2.50 per square foot or fibreglass at $1.50 to $3.00 per square foot — to reach or exceed R-20.

Adding up the full wall assembly for a 1,200-square-foot wall area, the total insulation cost (rigid foam plus batt) typically lands between $3,500 and $7,500 for materials and installation. Add framing at $2.50 to $5.00 per square foot ($3,000 to $6,000), drywall at $2.50 to $4.00 per square foot ($3,000 to $4,800), and vapour barrier (if not using spray foam, you'll need 6-mil poly on the warm side at a few hundred dollars), and the complete wall system runs $10,000 to $18,000 for a full basement.

If you're comparing rigid foam to the premium alternative, closed-cell spray foam at $3.00 to $5.00 per square foot for 2 inches covers both the thermal break and vapour barrier in a single application, eliminating the need for separate poly sheeting. For 1,200 square feet of wall, spray foam runs $3,600 to $6,000 — more expensive than rigid board alone but simpler to install and with superior air-sealing performance. Many Calgary contractors recommend spray foam for older homes in neighbourhoods like Brentwood, Varsity, and Lake Bonavista where foundation walls have more irregularities and cracks that rigid board can't conform to.

For cost-conscious homeowners, rigid foam board is the most DIY-friendly option. XPS panels cut with a utility knife, adhere to foundation walls with construction adhesive, and seal at seams with Tuck tape. Doing the rigid foam and batt installation yourself can save $2,000 to $4,000 in labour costs on a full basement, though you'll still need a building permit and inspection by a Safety Codes Officer. If you want professional quotes tailored to your specific basement, find local contractors through the Calgary Construction Network directory.