(formerly) a royal or official messenger, especially one representing a monarch in an ambassadorial capacity during wartime. 2. a person or thing that precedes or comes before; forerunner; harbinger: the returning swallows, those heralds of spring. 3. a person or thing that proclaims or announces: A good newspaper should be a herald of truth.
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. 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.
The ultimate cost of your fire sprinkler system depends on the brand and type of sprinkler system you install, but usually you can expect to pay anywhere from about $1.00 to $2.00 per square foot for new fire sprinkler system installations.