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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.
Theyâre not expensive! The average costs for a fire sprinkler system are as follows: 1  A complete fire sprinkler system integrated into a new construction project costs about $1 â 2 per square foot. 2  This includes equipment and installation. 3  Retrofitting an existing building usually costs between $2 â 7 per square foot. Retrofitting an existing building usually costs between $2 â 7 per square foot. 2  Retrofitting a high rise building will run you about $2 â 4 per square foot. 3  Installing a fire sprinkler in a historic building can sometimes be more expensive â up to $10 per square foot.