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A new piece of building code in the state of Minnesota will require fire sprinklers to be put into new townhomes, single-family and duplex homes that are larger than 4,500 square feet.
1 Nonmetallic installations average $1.18 per sprinklered square foot; a mix of both types costs on average $1.56 per sprinklered square foot; solely using metallic piping typically costs $3.19 per sprinklered square foot. 2  Location can play a role in the cost of fire sprinkler installation. Nonmetallic installations average $1.18 per sprinklered square foot; a mix of both types costs on average $1.56 per sprinklered square foot; solely using metallic piping typically costs $3.19 per sprinklered square foot. 2  Location can play a role in the cost of fire sprinkler installation.