Somerville, MA Building Safety: Fire Sprinkler Requirements (2026)

Under section 26I of chapter 148, any building constructed or rehabilitated to the equivalent of new construction in Somerville that is occupied in whole or in part for residential purposes and contains four or more dwelling units must be equipped with an approved automatic sprinkler system meeting the state building code. The statute lists covered building types by name: lodging houses, boarding houses, fraternity houses, dormitories, apartments, townhouses, condominiums, hotels, motels and group residences, so the reach covers most multi-family construction and student housing built in the city.

Somerville's Division 4 list of accepted acts confirms local adoption, recording chapter 148, sections 26H and 26I, as "automatic sprinkler requirements" accepted March 12, 1992, following the board of aldermen's acceptance of the broader 7,500-square-foot threshold in section 26G on May 28, 1987. The law builds in one water-based exception: if adequate water supply and pressure are not available at the site, the fire department head can permit an alternate approved fire suppressant system in place of sprinklers. Owners who install and properly maintain a qualifying system may also become eligible for a reduction on their fire insurance rate.

A parallel section, 26H, separately requires sprinklers throughout any lodging house or boarding house letting rooms to six or more unrelated persons, and states plainly that the head of the fire department shall enforce that provision. Because compliance is tied to the state building code (780 CMR), Somerville's Inspectional Services Division checks sprinkler installation as part of plan review, permitting and the certificate of occupancy process for covered projects rather than through a separate city ordinance text.