Off-Grid Living in Newmarket, New Hampshire

Newmarket, New Hampshire is a fully zoned town, and that's the first thing to get straight if you're eyeing a piece of land here for an off-grid setup. The Town Council adopted its Zoning Ordinance (Chapter 32) under authority the state legislature grants municipalities via RSA 674:16 and RSA 674:18. That ordinance is administered day to day by the Planning & Community Development office and enforced through the Zoning Board of Adjustment, which handles variances, special exceptions, and appeals. Worth noting: Newmarket is also in the middle of reworking its zoning into a "code-based" format (a draft from mid-2024 was under Planning Board review), so whatever I describe here could shift. Always check the current map and text with the Town.

On dwellings, Newmarket recently loosened its accessory dwelling unit rules. The Town Council amended its ADU section to allow attached, detached, or internal-conversion ADUs, and removed the requirement to go before the ZBA, meaning you can now get one approved through the Building Inspector alone. That's a meaningful opening for a small secondary off-grid-style unit on an already-developed lot. What I could not confirm from official sources is how Newmarket treats tiny homes on wheels or long-term RV living as a primary residence. Don't assume either is fine, call the Building Safety office before you commit to that plan.

Building permits are required, full stop, and Newmarket enforces the state's adopted building code package (based on 2018 IBC/IRC/IPC/IMC/IECC and 2020 NEC, with New Hampshire's own tweaks layered on). Septic approval is a state function through NH DES under RSA 485-A:38, II-a, particularly if you're converting a place from seasonal to year-round use or adding load to an existing system. Locally, Newmarket's Building Official doubles as the Local Health Officer, so that's your town-level contact on septic and health compliance. I did not find anything in Newmarket's own code addressing composting toilets specifically.

Greywater reuse, rainwater harvesting, and private wells all fall back to state-level rules (NH DES for wastewater, the state-adopted plumbing code for rainwater, and the state Water Well Board for wells) because I couldn't locate any Newmarket-specific ordinances layering on additional restrictions in these areas. Same goes for full utility disconnection, there's no explicit town rule mandating hookup to water or sewer, but the Building Official's health-officer role means case-by-case scrutiny is possible. Given how much is "not confirmed" here, treat this as a starting map, not a final answer, and get specifics from the Town before you buy or build.