[Massplanners] MA DEP Guidance on ADUs

Elizabeth Hughes ehughes at concordma.gov
Wed Apr 9 10:14:31 EDT 2025


Good morning fellow planners,

My Health Director sent me a copy of DEPs guidance on ADUs as it relates to Title V, which were issued on Monday, April 7th.

Basically, all ADUs are considered new construction, which can have major impacts on whether a property owner can upgrade an existing on-site sewage disposal system or has to install a brand new system.

The Regs can be found at:
https://www.mass.gov/doc/guidance-on-title-5-310-cmr-15000-compliance-for-accessory-dwelling-units/download

Sincerely,
Elizabeth

Elizabeth Hughes, Town Planner
Town of Concord
141 Keyes Road
Concord, MA 01742
978-318-3290

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