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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 A complete sprinkler system for new construction generally costs $1 to $2 per square foot including all equipment and installation. 2  Retrofitting an existing building is more expensive-usually about $2 to $7 per square foot.ompare Commercial Fire Sprinkler System Prices. Sprinkler systems save lives. Thereâs no doubt about it. The National Fire Protection Association reports that no more not many are injured due to fire or smoke in a fully sprinklered building when the system is operating properly.