[Massplanners] ADUs and Gross Floor Area

[Valerie Massard]

Health regulation 105 CMR 410 Minimum Standards of Fitness for Human Habitation apply to ADUs and have height/min square footage - very helpful to have as a backup.


Sincerely,

Valerie Massard, AICP, CFM (she/her)
Town Planner, Kingston, MA
Town Offices|26 Evergreen St.|Kingston, MA 02364
office 781-585-0549
vmassard at kingstonma.gov<mailto:vmassard at kingstonma.gov>
https://www.kingstonma.gov/184/Planning
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From: MassPlanners <massplanners-bounces at masscptc.org> On Behalf Of Leeann Bradley via MassPlanners
Sent: Tuesday, February 11, 2025 3:04 PM
To: massplanners at masscptc.org
Subject: [Massplanners] ADUs and Gross Floor Area

Good Afternoon,

I have a question regarding Gross Floor Area (GFA) on the height of basements in a by-right ADU.  If a basement height requirement for a habitable room, per the state building code, is 7'6" and plans for an ADU Site Plan Review are received with a basement height of 7'4", is the basement area not considered part of the Gross Floor Area, i.e., the 900s.f. limit for a by-right ADU?   If this is the case, we may be seeing ADU's amounting to 1,800s.f. with basements being illegally constructed.  Thank you.


Leeann Bradley
Director of Planning and Community Development
Town Hall Annex
20 Center Street
Middleborough, MA 02346
508-946-2425 ext. 1150

"Never doubt that a small group of thoughtful, committed citizens can change the world; indeed, it's the only thing that ever has".
Margaret Mead
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