Septic review for added rooms
Board of Health rule 339-11 says an addition that adds habitable rooms (bedrooms, dens, family rooms, offices) triggers a septic upgrade, unless the added space is 200 square feet or less. A finished basement goes through a habitable-room sheet in the permit packet, and if the system is too small for the room count, a deed restriction gets filed at the Salem Registry of Deeds.
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