Revise and replace section R313.2 One- and two-family dwellings automatic sprinkler systems as follows:
R313.2One-and two-family dwellings automatic sprinkler systems. Primarily owner occupied one- and two-family dwellings and accessory spaces newly constructed as short term rental lodging houses and primarily owner occupied one- and two-family dwellings and accessory spaces which began being used as short term rental lodging houses on or after October 17, 2017, shall be equipped with an automatic sprinkler system installed in accordance with NFPA 13D. Note: Non-primarily owner occupied one and two-family dwellings shall meet the requirements of 780 CMR based on the use classification determined in accordance with 780 CMR Chapter 3.
Revise and replace section 313.2.1 Design and installation as follows:
313.2.1 One and two-family dwellings with an aggregate area greater than 14,400 ft2, shall be equipped with an automatic sprinkler system installed in accordance with NFPA 13D. For the purposes of this section, aggregate area shall include the combined area of all stories of the building, basement areas and finished habitable attic areas. Garages, unfinished habitable attic areas, attic areas and crawlspaces shall not be included in the aggregate area. Exception: An automatic sprinkler system shall not be required where additions or alterations are made to existing one- or two-family dwellings having an aggregate area greater than 14,400 ft2 that are not already provided with an automatic sprinkler system. Aggregate area for the purposes of this exception shall be as described in R313.2 and shall include the addition or alteration area in the calculation.
780 CMR, ch. 51, ch. 3, R301, 301.1, 313.2
Amended by Mass Register Issue 1532, eff. 10/11/2024.