The best time to get fire sprinklers is when you are building. That's when they are the most affordable and the easiest to install.
Typically, home fire sprinklers operate off the household water main and use piping that is installed behind walls and ceilings in finished areas.
Attached to the piping at intervals are the individual sprinklers. Concealed sprinklers are often used in finished areas. An unfinished basement may have exposed piping and pendent sprinklers instead of concealed sprinklers. Each sprinkler can protect a minimum area of 12 x 12 feet. Extended coverage sprinklers are available that protect even larger areas.
Sprinklers activate independently – unlike hard-wired and interconnected smoke alarms. If there is a fire, only the sprinkler closest to the flames will operate. A recent study showed that in about 90% of home fires, only one sprinkler was necessary to control the fire.