Cheshire County, New Hampshire
Town of Sullivan is a town in Cheshire County, New Hampshire. Town of Sullivan adopts its own zoning, so inside its limits Town of Sullivan’s rules apply, not the county’s. Septic permits inside Town of Sullivan come from the county and state together. 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 Cheshire County page.
Dwelling units (including ADUs, seasonal or permanent) and any building or structure over 400 square feet inside Sullivan town.
structure size threshold for permit: > 400 square feet (Applies to buildings or structures over this size, attached or detached; dwelling units require a permit regardless of size.)
“A building permit shall be required for all dwelling units, including ADUs, seasonal or permanent. A building permit shall also be required to erect or place any type of building or other structure, attached or detached, which will be over 400 square feet.”
Newly constructed or placed dwellings or structures intended for human habitation in Sullivan town.
“Before any newly constructed or placed dwelling or structure intended for human habitation can be occupied or utilized, an occupancy permit shall be approved by the Board of Selectmen or their designee.”
All land inside Sullivan town limits; the town's own Community Planning Ordinance (zoning) governs use and dimensions.
“This Ordinance has been adopted in accordance with Chapter 674:17, N.H. Revised Statutes Annotated (RSA) in order to insure that the Town of Sullivan shall have the benefits of land use regulations”
All land inside Sullivan town limits: the entire town is one Rural Residential District.
“The Town of Sullivan shall consist of one Rural Residential District as shown on the Community Planning Map.”
Principal dwelling units in the Rural Residential District (the whole town of Sullivan).
minimum principal dwelling interior living area: >= 700 square feet (Not less than 600 square feet must be on one level.)
“The minimum total interior living area for a Principal Dwelling Unit shall be 700 square feet, of which not less than 600 square feet shall be on one level.”
Structures in the Rural Residential District (the whole town of Sullivan): setbacks from the highway right-of-way and from adjacent property lines.
minimum setback from highway right-of-way: >= 50 feet · minimum setback from adjacent property lines: >= 20 feet
“The minimum set back from the highway right of way is 50 feet. The minimum set back from adjacent property lines is 20 feet.”
“All buildings or structures shall be located no less than fifty feet (50) from the normal high water mark (within the past 5 years) of the following bodies of water:”
Buildings in the Rural Residential District (the whole town of Sullivan).
maximum building height: <= 35 feet
“The maximum height of a building shall be 35 feet above mean ground level.”
Occupied recreational vehicles on private lots in Sullivan town.
maximum consecutive occupancy on a lot: <= 90 days (Extension may be requested of the Board of Selectmen; commercial campgrounds approved by the planning board are excluded.)
“No occupied recreational vehicle, tent or homemade shelter shall be permitted to be placed on any lot for a period of more than ninety (90) consecutive days.”
Occupied tents and homemade shelters on private lots in Sullivan town.
maximum consecutive occupancy on a lot: <= 90 days (Commercial campgrounds approved by the planning board are excluded.)
“Occupied recreational vehicles, tents and homemade shelters that have been on a property for ninety (90) consecutive days must be removed from the property for at least twenty-eight (28) consecutive days before re-occupying the same property.”
Manufactured housing placed on private land in Sullivan town.
“Manufactured housing may be located in Sullivan provided it conforms to all of the provisions of this ordinance that are applicable to single-family dwellings.”
Detached accessory dwelling units on a lot in the Rural Residential District of Sullivan town.
minimum lot area for one detached ADU: >= 4 acres (Two detached ADUs require 10 acres or more.)
“A single detached ADU located on the same lot as and incidental to the principal dwelling unit shall be permitted for lots of 4 or more acres. A maximum of two detached ADUs located on the same lot as and incidental to the principal dwelling unit shall be permitted for lots of 10 acres or more. An approved septic system design is a prerequisite to construction.”
“One internal or attached accessory dwelling unit per single family dwelling will be deemed a permitted accessory use for all single-family dwellings.”
New dwelling units in Sullivan town that need a septic system.
“When applicable, the necessary State approvals shall be obtained for construction of a septic or alternative waste disposal system.”
Dwelling units in Sullivan town; off-grid or non-septic sanitation is limited.
“Each dwelling unit shall contain at least one flush-type toilet, properly ventilated and constructed, and connected to a State-approved septic system for the flushing of the sewage to a septic tank with adequate leaching area or bed, or State-approved alternative waste disposal system.”
New or changed driveways, entrances, exits or approaches to private, town or state roads in Sullivan town.
“Prior to the construction or change in use and/or intensity of use of any driveway, entrance, exit, or approach to any private, town or state road, and prior to obtaining any applicable building permits for the property, the landowner or authorized agent shall secure approval of such proposed construction or changes in accordance with Town of Sullivan Driveway Regulations.”
Buildings, septic tanks, leach fields, fences, roads and other structures near watercourses and the flood plain district in Sullivan town.
“No person shall build, construct, or place any building, manufactured housing of any type, campsite, septic tank, leach field, any other part of a sewer system, fence, road, or any other structure of any type in the following locations without a written permit to do so by the Board of Selectman, and then only after a public hearing.”
Building permit fees in Sullivan town.
“The Board of Selectmen is authorized to establish the amount of a fee for building permits.”
We looked and could not find an official answer yet. Silence is not permission; ask Town of Sullivan or Cheshire 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 Sullivan publishes no rule on the point, not that none exists. Cheshire County’s page lists the county offices to call.
Off-grid gear
Going off-grid in Town of Sullivan means bringing your own water and power. The kit we’d start with:
These are affiliate links — we may earn a commission, at no cost to you. As an Amazon Associate, Bolthole Index earns from qualifying purchases.