How much would it cost to spray foam a 20x20 garage?

Cost to spray foam a 20x20 garage, which has 400 square feet floor and about 640 square feet wall area with 8 foot walls plus 400 ceiling, total about 1,040 square feet minus doors, varies by open or closed cell and thickness, similar to previous estimate. For open-cell spray foam at 3.5 inches in walls and 5.5 inches in ceiling, professional cost $1.50 to $2.50 per square foot, so walls only about 640 sq ft costs $960 to $1,600, walls plus ceiling 1,040 sq ft costs $1,560 to $2,600. For closed-cell at 2 inches providing R-13 to R-14, cost $2.00 to $3.50 per sq ft, so walls only $1,280 to $2,240, walls plus ceiling $2,080 to $3,640. DIY using Froth-Pak kits, 200 board foot kit $350 to $550 covers 100 sq ft at 2 inches, need 6 to 10 kits for walls plus ceiling, material cost $2,100 to $5,500 plus gear, so DIY not cheaper for large. Additional costs include prep, masking, and ignition barrier if required by code. So spray foam 20x20 garage costs $1,500 to $4,000 professionally depending on open or closed cell, thickness, and whether ceiling included, with closed-cell more expensive but higher R-value and moisture barrier, open-cell cheaper and good for interior.