Sullivan County, New Hampshire
Town of Plainfield is a town in Sullivan County, New Hampshire. Town of Plainfield adopts its own zoning, so inside its limits Town of Plainfield’s rules apply, not the county’s. Septic permits inside Town of Plainfield come from the state health agency. 19 rules below are quoted from official sources and independently re-checked, most recently on October 29, 2026. Rules for unincorporated land are on the Sullivan County page.
Building and regulated-system work inside Plainfield town limits.
“Permits required by any owner or authorized agent: Construct, enlarge, alter, repair, move, demolish, or change the occupancy of a building or structure. Replacing windows that involve structural changes or windows in areas that require an egress window.”
Construction projects inside Plainfield town limits.
“Plainfield is governed by the set of codes adopted by the State of New Hampshire and the Town of Plainfield. The list of State adopted codes can be found on-line:”
Projects issued a Plainfield permit.
“The inspections checked below are required for your project. Please provide at least 24 hours’ notice for all inspections.”
Occupancy of a residence inside Plainfield town limits.
“Upon satisfactory final inspection either a Certificate of Occupancy or a Certificate of Completion will be issued. A Certificate of Occupancy is required to occupying a residence.”
Land inside Plainfield town limits.
“In accordance with the laws of New Hampshire Chapters 672-677, NH. Revised Statutes Annotated (RSA) and amendments thereto, a Zoning Ordinance for the Town of Plainfield, NH is hereby established.”
Land inside Plainfield town limits.
basic zoning districts: Village Residential; Rural Residential; Rural Conservation I; Rural Conservation II; Conservation
“For purposes of this Ordinance, the Town of Plainfield as shown on the District Map is divided into five basic zoning districts which are (1) Village Residential (VR), (2) Rural Residential (RR), (3) Rural Conservation (RC-I), (4) Rural Conservation II (RC-II), and (5) Conservation (CON), and three conservation overlay districts”
Residence and seasonal dwelling units, including manufactured housing, inside Plainfield town limits.
minimum ground-floor area: >= 320 square feet (Includes manufactured housing units.)
“Floor area: Residence and seasonal dwelling units, including manufactured housing units, shall have a ground floor area not less than 320 square feet.”
Village Residential and Rural Residential districts inside Plainfield town limits.
VR minimum lot size: 20000-40000 square feet (20,000 with public water and sewer; 30,000 with either; 40,000 with neither.) · RR minimum lot size: 3.5 acres
“Minimum Lot Size: 20,000 square feet with public water and sewer, 30,000 square feet with public water or sewer, 40,000 square feet with not public water or sewer”
Village Residential and Rural Residential districts inside Plainfield town limits.
VR setbacks: front 30; side 15; rear 15 feet · RR setbacks: front 30; side 20; rear 30 feet
“Minimum Setbacks: Front: 30’; Side: 15’; Rear: 15’ (linear)”
Village Residential and Rural Residential districts inside Plainfield town limits.
VR maximum impervious surface: <= 40 percent · RR maximum impervious surface: <= 20 percent
“Maximum Lot Coverage: 40% Impervious Surface”
Village Residential and Rural Residential districts inside Plainfield town limits.
maximum building height: <= 35 feet (Without Zoning Board approval.)
“Maximum Lot Coverage: 40% Impervious Surface Maximum Building Height: 35’”
Camping trailers and motor coaches occupied inside Plainfield town limits.
occupancy without special permit: <= 14 consecutive days · special-permit maximum: <= 90 days in any 12-month period
“Camping trailers (whether of the truck-mounted or tow varieties) or motor coaches may be occupied for a period of 14 consecutive days in the Town of Plainfield without a special permit. For a period of longer than 14 consecutive days, a special permit authorizing occupancy must be issued by the Zoning Administrator.”
Camping-trailer and motor-coach occupancy inside Plainfield town limits.
occupancy without special permit: <= 14 consecutive days
“Camping trailers (whether of the truck-mounted or tow varieties) or motor coaches may be occupied for a period of 14 consecutive days in the Town of Plainfield without a special permit.”
Manufactured housing placed inside Plainfield town limits.
minimum ground-floor area: >= 320 square feet (Applies to residence and seasonal dwelling units, including manufactured housing units.)
“No building construction, land development, or citing of manufactured housing may commence and no land or structure may be devoted to a new or changed use within the Town unless permitted under this Ordinance or approved by the Zoning Board and until a Zoning Permit has been issued by the Zoning Administrator.”
New residences and manufactured housing inside Plainfield town limits.
“All permits for new residence construction, including the citing of manufactured housing units, shall be granted only upon provision of acceptable sanitary systems of sewage disposal.”
Subdivision and minor lot-line adjustments inside Plainfield town limits.
“These regulations apply to Planning Board review and approval or disapproval of all subdivisions as defined by RSA 672:14 and minor lot line adjustments or boundary agreements. They do not apply to voluntary mergers as defined by RSA 674:39-a.”
Subdivision applications inside Plainfield town limits.
“Lot size, street frontage and driveway permits, as well as State approval of septic systems, where needed, are considered in the Planning Board's review of subdivision applications.”
Land in Plainfield's Floodplain Conservation Overlay District.
“The Floodplain Conservation Overlay District in this ordinance shall apply to all lands designated as special flood hazard areas by the Federal Emergency Management Agency (FEMA) in its "Flood Insurance Study for the County of Sullivan, N.H." dated May 23, 2006 or as amended together”
Town of Plainfield does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.
We looked and could not find an official answer yet. Silence is not permission; ask Town of Plainfield or Sullivan County directly.
Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.
Unanswered questions are usually a sign that Town of Plainfield publishes no rule on the point, not that none exists. Sullivan County’s page lists the county offices to call.
Off-grid gear
Going off-grid in Town of Plainfield means bringing your own water and power. The kit we’d start with:
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