The cost to insulate 2000 square feet varies significantly by location, type of insulation, and whether you DIY or hire a contractor, but here are current 2026 estimates. For attic floor insulation, which is the most common 2000 square foot project, DIY blown-in cellulose or fiberglass costs about $0.60 to $1.20 per square foot in materials to reach R38 to R49 when you use the free blower machine rental from Home Depot or Lowe's. That means $1200 to $2400 for materials. Professional installation for 2000 square feet of blown-in attic insulation typically costs $1.50 to $3.00 per square foot, or $3000 to $6000 including air sealing and cleanup. For wall insulation, 2000 square feet of home floor space equals roughly 4500 to 5000 square feet of wall area. Dense-pack cellulose or Johns Manville Spider spray-in fiberglass for existing walls costs $2.00 to $4.00 per square foot of wall area, so $9000 to $20000 for a whole house. Batt insulation for new construction with R13 or R15 in 2x4 walls costs $1.00 to $1.80 per square foot installed. Spray foam is most expensive. Open-cell spray foam for 2000 square feet of attic floor costs $3.50 to $5.50 per square foot, or $7000 to $11000. Closed-cell costs $5.50 to $8.50 per square foot, or $11000 to $17000. Many utilities offer $400 to $1200 rebates that reduce net cost.
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