"According to the National Fire Protection Agency, an international nonprofit established in 1896, the fatality rate in homes with sprinklers is 80 percent lower than homes without sprinklers. The National Association of Home Builders counters that the survival rate for homes with operating smoke detectors is nearly 99.5 percent, and thus the added protection addresses a tiny proportion of fire-related deaths. The National Fire Protection Agency endorses the use of sprinklers in homes.
The home builders' association estimates the cost to install a sprinkler system in a roughly 2,200-square-foot home at $5,573. When factoring in financing costs, brokerage commissions, and other related costs, the builders estimate costs of nearly $6,700 per home - and up to $10,000 per home in rural areas, Toalson said."