Off-Grid Living in Westwood, Massachusetts

I've been digging into what off-grid living would actually look like in Westwood, Massachusetts, and the short version is: this is a well-regulated suburban Boston town, not a rural jurisdiction with loose rules. If you're picturing a stealth cabin on raw land with a composting toilet and a rain barrel, you'll run into town oversight at almost every step.

Zoning comes first. Westwood has its own Zoning Bylaw, adopted under the state's Chapter 40A, and it's explicit: land and structures can only be used the way the applicable zoning district allows. The Planning Board and Building Commissioner administer this, so before you buy land, I'd pull the zoning map and confirm what the parcel is designated for.

Building anything requires going through the Building Division. For new construction on an undeveloped lot, Westwood's own guide says you need to work with this office, and any change in how a structure is used triggers an occupancy permit requirement from the Building Commissioner (currently Joe Doyle, per town records). I did not find a specific Westwood rule addressing tiny homes or RVs as full-time dwellings, so I'm treating that as unconfirmed. It would likely fall under general use restrictions, but it's exactly the kind of edge case where you want the Building Commissioner's answer in writing before you commit.

Septic and wells are both permitted processes through the Board of Health. Any septic or wastewater system needs a Board of Health permit, sitting on top of the state's Title 5 regulations (310 CMR 15.000) that MassDEP writes but local boards enforce. Wells work the same way: both domestic and irrigation wells need Board of Health permits, and there's a water-quality testing requirement tied to property sales. The Health Division office is on Carby Street.

Greywater and rainwater are the fuzzy spots. I couldn't find any Westwood-specific rule creating an exception to the state's Title 5 approach to wastewater, which generally means greywater has to go through a permitted septic system rather than being reused informally. Rainwater harvesting is even less clear: I found nothing from the town addressing it one way or the other, so I'd call the Health Division or Building Division directly if that's part of your plan.

Full utility disconnection isn't separately banned, but there's a practical hurdle. Westwood's new-dwelling process requires proof of potable water on site, whether from the municipal system or a permitted well, before building. So even if you want to go solar-only and off the electric grid, you'll still need to satisfy the water requirement through one of those two approved paths.

Bottom line: nothing here is impossible, but nothing is informal either. Westwood expects permits and inspections at each stage, and the town offices are the ones with the final word.