how much to put a sprinkler system in my house
1 According to the Fire Protection Research Organization's 2009 Fire Sprinkler Cost Assessment, sprinkler installation costs homebuilders $0.38-$3.66 per sprinklered square foot, with an average cost of $1.61 per sprinklered square foot.2  For an average 2,200-square-foot home, expect to pay about $3,542. Communities with sprinkler ordinances typically charge permit and inspection fees. 2  Some communities have flat fees, and others base the fees on square footage or value of the house. 3  Typically, the permit costs are $50-$350, but some communities charge as high as $800 in permit fees.