Mo. Rev. Stat. § 67.281

67.281. Installation of fire sprinklers to be offered to purchaser by builder of certain dwellings — purchaser may decline. — 1. A builder of one- or two-family dwellings or townhouses shall offer to any purchaser on or before the time of entering into the purchase contract the option, at the purchaser's cost, to install or equip fire sprinklers in the dwelling or townhouse. Notwithstanding any other provision of law to the contrary, no purchaser of such a one- or two-family dwelling or townhouse shall be denied the right to choose or decline to install a fire sprinkler system in such dwelling or townhouse being purchased by any code, ordinance, rule, regulation, order, or resolution by any county or other political subdivision. Any county or other political subdivision shall provide in any such code, ordinance, rule, regulation, order, or resolution the mandatory option for purchasers to have the right to choose and the requirement that builders offer to purchasers the option to purchase fire sprinklers in connection with the purchase of any one- or two-family dwelling or townhouse.

2. Any governing body of any political subdivision that adopts the 2009 International Residential Code for One- and Two-Family Dwellings or a subsequent edition of such code without mandated automatic fire sprinkler systems in Section R313 of such code shall retain the language in section R317 of the 2006 International Residential Code for two-family dwellings (R317.1) and townhouses (R317.2).

(L. 2009 H.B. 103 and L. 2009 S.B. 513, A.L. 2011 H.B. 315 merged with S.B. 108, A.L. 2014 H.B. 1410 merged with S.B. 655 merged with S.B. 672, A.L. 2016 S.B. 732)