Off-Grid Living in Wellesley, Massachusetts

I'll say this plainly up front: Wellesley is one of the toughest places in Massachusetts to try to go off-grid. It's a fully zoned, densely built Boston suburb, and there's no unzoned pocket or agricultural exemption hiding anywhere in town. If you're picturing raw land with a cabin and a well, this isn't that town.

Zoning. Wellesley's Zoning Bylaw, restructured at the 2022 Annual Town Meeting, covers the whole town, mostly through Single Residence Districts with strict rules on lot area, yards, and building height. Anything bigger or more unusual, what the bylaw calls a "Project of Significant Impact," needs a special permit from the Planning Board, and any land subdivision has to go through Planning Board approval too. I found nothing suggesting bare-land living or off-grid homesteading is an as-of-right use anywhere in Wellesley.

Dwellings, tiny homes, RVs. The bylaw is specific about dwelling types (one-unit, two-family, town house) and allows one Accessory Dwelling Unit per one-unit dwelling under Section 5.13 of the Zoning Bylaw, but not on two-family or town house lots. I didn't find any path for an RV or tiny home to serve as an independent, permanent residence. Whether the town's General Bylaws separately restrict long-term RV occupancy or outdoor storage, I couldn't confirm from what I reviewed, so ask the Town Clerk's office or Building Department directly.

Building permits. The Wellesley Building Department administers the Massachusetts State Building Code (780 CMR), the same baseline every town uses. Large residential builds get extra Planning Board scrutiny under the bylaw's Large House Review provisions.

Septic and greywater. Septic systems fall under the state's Title 5 (310 CMR 15.000), enforced locally by the Wellesley Board of Health, which can (and often does, per the state's own guidance) set stricter local rules than the state minimum. I couldn't locate Wellesley-specific septic or greywater text beyond that, so confirm current local requirements with the Board of Health. Title 5 was amended back in 2006 to allow greywater disposal only through approved on-site systems, and that's the baseline Wellesley would follow.

Rainwater harvesting. No Wellesley-specific rule turned up in my research. Default to the state approach: outdoor, non-potable catchment is generally fine, indoor or potable use runs into plumbing code questions.

Wells and utilities. The Board of Health is the local authority for wells and on-site water systems, with the state DEP involved for certain approvals, but I didn't find Wellesley's specific siting rules. Living off-grid electrically isn't itself prohibited that I could find, but any new structure still has to clear the state building code and the local Building Department, including electrical and life-safety requirements.

Bottom line: everything meaningful here runs through the Wellesley Building Department, Planning Board, and Board of Health, layered on top of state law. This is a call-first town.