Off-Grid Living in Dunbarton, New Hampshire

If you're weighing an off-grid setup in Dunbarton, New Hampshire, here's what I found digging through the town's own documents and the state rules that sit behind them.

Dunbarton is a zoned town, not one of New Hampshire's unzoned townships. The Town of Dunbarton Zoning Ordinance, as amended through town meeting (most recently with 2026 warrant articles), divides the town into districts with dimensional standards, setbacks, and use rules, all enforced by the town's Zoning Board of Adjustment. So the first question for any off-grid plan is what district your parcel sits in and what the setback and use rules say there. That's a conversation for the Building & Land Use Administrator's office, not a guess from a blog.

On dwellings: Dunbarton allows Accessory Dwelling Units, but as of my research the town's current ordinance still required an ADU to be attached to a house or accessory structure. A 2025 state law change forces the town to allow stand-alone ADUs too, and Dunbarton was working through a 2026 zoning amendment to implement that. If a tiny house or a detached cabin is part of your plan, ask the town directly where that amendment stands. I found nothing specific on tiny homes on wheels or long-term RV living as a primary residence, so treat that as unconfirmed and ask before you commit.

Building permits are handled locally: the Dunbarton Building Department issues permits for building, electrical, plumbing, gas/mechanical, driveway, and solar work, with inspections by the town's Building Inspector.

Septic is where state and town rules braid together. New Hampshire requires any structure connected to a water supply to also be connected to a wastewater disposal system, and septic designs must come from a state-permitted designer. Dunbarton's Building and Planning Department reviews septic plans locally before they go to NHDES's Subsurface Systems Bureau for final state approval. Composting toilets aren't addressed separately in anything I found at the town level, so that likely falls back on state DHHS guidance, worth confirming directly.

Greywater reuse, rainwater harvesting, and private wells don't have dedicated Dunbarton ordinances that I could locate. These default to state frameworks (NHDES for water quality matters, the state Water Well Board for well construction), with the town's Building Department enforcing the state-adopted building and plumbing code for anything piped indoors.

On full off-grid disconnection: I didn't find an outright town ban on living without water or sewer hookups. But the linkage rule (any water hookup requires a wastewater system) constrains how you could set things up if you do bring in water service. A parcel with no water connection at all falls into a gap I couldn't confirm, so ask the town directly.

Bottom line: Dunbarton isn't hostile to off-grid living, but nearly everything routes through either the local Building Department or NHDES, and the ADU rules are mid-change. Confirm before you buy or build.