In 2013 the average cost for a home fire sprinkler system was $1.35 per square foot. The price has dropped about six cents per year since 2008. So the cost is now likely 1.20 per square foot. The average new home in Gardner is about 1700 square feet. So a sprinkler system will cost around $2200. How does this compare to other construction costs. Most flooring costs an avergae of 2.80 per square foot so a sprinkler system that will save your life costs less than half of carpet.