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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.prinkler System Average Costs. Small businesses or homeowners might spend a few thousand dollars to install a fire sprinkler system while large corporations could spend hundreds of thousands. The price depends on a variety of factors.