Spray Foam Cost Guide — Boise, ID
What Boise homeowners can expect to pay for spray foam in 2026. Typical ranges based on size, materials, and project complexity.
Typical Cost Ranges
Spray Foam Insulation
Closed-cell and open-cell spray foam for maximum R-value.
$3,000 – $12,000
Attic Insulation
Air sealing and insulation to stop energy loss through the attic.
$3,000 – $12,000
Wall Insulation
Injection foam for existing walls — no drywall removal needed.
$3,000 – $12,000
Crawl Space Insulation
Encapsulation and insulation for vented crawl spaces.
$3,000 – $12,000
Energy Audit
Thermal imaging and blower door testing to find every leak.
$3,000 – $12,000
What Affects Cost
Several factors influence your final price: driveway size (square footage), concrete thickness, finish type (broom vs. stamped), site prep needs (demolition, grading), and reinforcement requirements. Idaho's freeze-thaw climate means proper base preparation is essential — cutting corners here leads to cracks within 2-3 years.
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