Off-Grid Living in Gilmanton, New Hampshire

I've been digging into what it actually takes to live off-grid in Gilmanton, New Hampshire, and the short version is: this is a rural-friendly town on paper, but it's still a zoned town with a building department that expects permits, and state law adds its own strings for certain dwelling types.

Zoning. Gilmanton is zoned under authority granted by state law (RSA 673-677), and most of the town falls into the Rural Zone, which the town's zoning ordinance sets at a two-acre minimum lot size with 200 feet of road frontage on a Class V or better road. There's also a Business Zone and a Residential Lake/Sawyer Lake Village Zone with their own rules. If you're buying raw land, the Planning Board is who sorts out district boundaries and permitted uses.

Dwellings, tiny homes, RVs. The town's ordinance restricts living in an RV, or part of a building, as a year-round dwelling. Portable toilets and temporary occupancy are allowed only for short stretches (the ordinance says up to seven days for things like construction or events) without a permit. Manufactured housing has its own separate track in the ordinance, and there are Accessory Dwelling Unit provisions too. Worth noting: state law (RSA 674:75) requires a tiny house used for habitation to connect to either a public water system or private well, and to either public sewer or a subsurface (septic) system. That state rule applies here regardless of what the town ordinance does or doesn't say about tiny houses specifically.

Building permits. The town requires permits and inspections, handled by a part-time Building Inspector and the Code Enforcement Officer. Because the inspector isn't full-time, don't expect same-day turnaround. The town has adopted the 2021 IRC, including its climate/design tables, as its building code baseline.

Septic and greywater. Septic design and approval runs through New Hampshire's Department of Environmental Services (state level), not just the town. Gilmanton's own site plan process requires state septic approval. I did not find any town-specific composting-toilet or greywater ordinance, so those likely fall under the state DES wastewater framework by default, and I'd confirm directly with DES before assuming a composting-only setup is fine for full-time occupancy.

Rainwater and wells. No Gilmanton-specific rainwater harvesting rule turned up in my research; this is another area where the state building code (2021 IRC) is the likely baseline. Private wells are state-regulated, and I didn't find a separate Gilmanton well ordinance beyond that.

Full off-grid, off-utilities living. For most structures, this is a gray area you'll need to confirm with the town, but for tiny houses specifically, state law is fairly direct: you need a water connection and a wastewater connection of some kind, public or private. That makes a fully unplugged, no-well, no-septic legal dwelling a tough sell in Gilmanton.

Bottom line: talk to the Planning Board and Building/Code Enforcement office early, and loop in NH DES for anything septic-related, before you commit to a piece of land or a structure type.