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

Town of Loudon’s own rules

• Building permitLimited

  Placing a manufactured housing unit inside Loudon town. The zoning text opened does not address general building permits for other construction.

  • Permit is issued by the code enforcement and building department.

  “anyone intending to locate a manufactured housing unit in the town of loudon must obtain a permit from the code enforcement & building department.”

• Local zoningPresent

  Land inside Loudon town limits: the town adopts and administers its own zoning ordinance

  “town of loudon new hampshire zoning ordinance amended march 2026 contents article i”

• Zoning districtsPublished

  Use districts inside Loudon town (Rural Residential district, Article II section 204, is confirmed here; other districts are listed in the ordinance but were not opened)

  • The table of contents lists Village (s 203), Rural Residential (s 204), Agriculture/Forestry Preservation (s 205) and Commercial/Industrial (s 206) districts, plus overlay districts.

  “204.4 area, frontage, and coverage requirements except as otherwise provided herein for certain uses requiring special exceptions”

• Minimum lot sizeSpecified

  Rural Residential (RR) district in Loudon town (main residential/rural district). Not verified for the Village or Agriculture/Forestry Preservation districts.

  • Two-family dwellings require three acres and 250 feet of frontage.
  • Every lot must also contain at least 1.5 acres of contiguous buildable area (adopted 2022).
  • Section 204.4 applies except as otherwise provided herein for certain uses requiring special exceptions.

  minimum lot area: >= 2 acres (two-family dwellings require 3 acres) · minimum lot frontage: >= 200 feet (two-family dwellings require 250 feet) · minimum contiguous buildable area: >= 1.5 acres

  “a. lot area: minimum of two acres, except two-family dwellings which require three acres b. lot frontage: minimum 200 feet, except two-family dwellings which require 250 feet”

• SetbacksSpecified

  Rural Residential (RR) district in Loudon town. Not verified for the Village or Agriculture/Forestry Preservation districts.

  • Driveways may cross front yard setbacks and side setbacks for driveways may be reduced by special exception.
  • The above requirements may be reduced by special exception, and the Board of Adjustment must make the determinations required by section 701.3 before granting one.
  • Side setback is 15 feet for non-residential and accessory structures (amended 2026).

  front setback: 50 feet · side setback: 30 feet (15 feet for non-residential and accessory structures) · rear setback: 40 feet

  “a. front setback: 50 feet b. side setbacks: 30 feet, 15 feet for non-residential and accessory structures [amended 2026] c. rear setbacks: 40 feet”

• Lot coverageSpecified

  Rural Residential (RR) district in Loudon town. Not verified for the Village or Agriculture/Forestry Preservation districts.

  • Building coverage is measured against the area of the lot.
  • Total impermeable coverage includes building coverage.

  building coverage maximum: <= 10 percent of lot area · total impermeable coverage maximum: <= 20 percent of lot area

  “c. coverage: building coverage shall not exceed ten percent of the area of a lot. total impermeable coverage (including building coverage) shall not exceed twenty percent of the area of a lot.”

• Manufactured homesLimited

  Manufactured housing units on a private lot inside Loudon town

  • No lot may contain more than one manufactured housing unit, except in manufactured housing parks.
  • Anyone intending to locate a manufactured housing unit must obtain a permit from the code enforcement and building department.

  manufactured housing units per lot: <= 1 units (manufactured housing parks)

  “no lot shall contain more than one (1) manufactured housing unit except in manufactured housing parks.”

Rules another office applies inside Town of Loudon

Town of Loudon does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.

• Who permits septicState (with conditions)

  Septic approval for temporary manufactured housing inside Loudon town: the septic system must be approved by NHDES. Other Loudon septic rules were not located.

  • Applies to the temporary manufactured housing use only.

  “before a temporary use permit may be issued, a septic system approved by the new hampshire department of environmental services must be installed and be capable of being hooked up to the manufactured housing unit.”

Still unanswered

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

• Owner-builder exemption — Owner-builder exemption inside Loudon town
• Building code adopted — Building code adoption inside Loudon town
• Inspections — Building inspection inside Loudon town
• Certificate of occupancy — Certificate of occupancy inside Loudon town
• Minimum dwelling size — Minimum dwelling size inside Loudon 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 Loudon 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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