1 Cost: The average cost per square foot is between $0.64 - $1.19. 2  So, for a 500 square foot area, your estimate will vary between $145 to $200, if you do it yourself. 3  For a professional job, add between $150 to $300 for labor, and you're looking at around $300 to $500 for 6 hours of work. There is little learning curve involved with the application, and a DIY job will cost you about $500. 2  Calling in the pros, on the other hand, will run you about $1,500 to $2,000 for an average 1500 square foot home.