Zoning, building permits and septic rules in Town of Sandown, New Hampshire

Town of Sandown’s own rules

• Local zoningPresent (with conditions)

  Land inside Sandown town limits. The Town adopts and administers its own Zoning Ordinance (sandown.us DocumentCenter 370, last amended March 9, 2021), including the accessory dwelling, floodplain, and mobile home articles.

  • Zoning topics below are answered from this ordinance only where the text was opened and quoted; the rest are unknown.
  • Amendment Z-2 on the 2026 Town warrant concerns accessory dwelling units; its adoption status was not verified and was not opened.

  “accessory dwelling unit ordinance (amended march 14, 2017) authority this section is enacted in accordance with the provisions of rsa 674:71 to:73”

• SetbacksSpecified

  Subsurface wastewater disposal systems (septic tanks, leach fields) in Sandown town, measured from any wetland area.

  • Poorly drained soils may fulfill up to 25% of minimum lot area; this wetland setback is separate from lot-size rules.
  • State subsurface and wetland permitting is not verified here.

  septic to wetland setback: >= 75 ft (horizontal distance; applies to construction or enlargement of subsurface wastewater systems)

  “no septic tank, leach field, or any other subsurface wastewater disposal system may be constructed or enlarged within seventy-five (75) horizontal feet of any wetland area”

• Manufactured homesLimited

  Mobile homes and house trailers placed anywhere in Sandown town (Zoning Ordinance Article IV, House Trailer and Mobile Home Regulations).

  • A written permit from the administrative authority is required before locating a house trailer or mobile home in any zone.
  • A house trailer or mobile home owned by a residential landowner and used for travel or business may be stored without a permit if stored under cover or behind the premises and at least 25 feet from side and rear property lines.
  • Mobile homes must be enclosed with full perimeter permanent skirting and supported on a concrete pad or permanent foundation.
  • Residential, industrial, and commercial structures other than mobile homes must sit on a permanent foundation below frost line.

  storage setback from side and rear lot lines: >= 25 ft (stored house trailer or mobile home owned by residential landowner for travel or business, under cover or to rear)

  “a permit, in writing, must be obtained from the administrative authority before locating any house trailer (hereinafter referred to as a trailer) or a mobile home in any zone within the town of sandown”

• Subdividing landRegulated (with conditions)

  Land divided into lots in Sandown town. The Town Zoning Ordinance sets minimum lot sizes for subdivisions, and the Sandown Land Subdivision Control Regulations govern lot configuration and street layout.

  • Minimum lot sizes within all subdivisions must meet the Table 1A soil-type requirements.
  • Subdivision approval is through the Sandown Planning Board, per the ordinance's open space and yield plan provisions.
  • The Subdivision Control Regulations document itself was not opened.

  “minimum lot sizes within all subdivisions shall meet the lot size requirements specified in table 1a”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Town of Sandown or Rockingham County directly.

• Building permit — Building permits for residential construction in Sandown town
• Owner-builder exemption — Owner-builder construction in Sandown town
• Building code adopted — Building code adopted in Sandown town
• Inspections — Building inspections in Sandown town
• Certificate of occupancy — Certificates of occupancy in Sandown town

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.

Off-grid gear

Going off-grid in Town of Sandown means bringing your own water and power. The kit we’d start with:

• Water Crystal Quest Filter any source — well, rain, or creek — to drinking-clean.
• Power Bluetti Solar generators and home battery backup for living off the grid.
• Septic Soil percolation test kit Run your own perc test before paying an engineer — the first thing a septic office asks about.
• Water Well water test kit Bacteria, nitrates, hardness — know what the well on a parcel is really pumping.

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