Building permits, zoning and septic rules in Rockingham County, New Hampshire

Covered construction, renovation, alteration, repair, removal or demolition in Rockingham County requires a building permit before work begins¹. The state building and fire codes apply throughout Rockingham County, while a municipality with a local enforcement mechanism uses its locally adopted permit process^1,4. Exeter is one example, not a countywide process: Exeter requires permits for residential and commercial construction¹⁰. The state permit system handles certain work where local enforcement is absent, but excludes one- and two-family dwellings in those municipalities¹. An owner doing the work is not broadly exempt from permits or inspections, although limited plumbing and fuel-gas licensing exemptions may apply^1,8. Identify the town or city first, then ask its building office which building permit, trade permit and inspection requirements apply. Septic permits are a separate approval from NHDES, not from the town building office.

Start with the building or code-enforcement office (the office that issues building permits) for the town or city containing the parcel, because the official materials do not establish one countywide application process¹. Exeter's Building Department provides inspections, code enforcement, zoning administration and permit applications only for Exeter¹⁰. The Exeter office is at 10 Front Street, Exeter, NH 03833, and its phone number is 603-773-6112¹⁰. A building official must act on a completed ordinary application within 30 days; the deadline is 60 days for a nonresidential application or a residential application encompassing more than 10 dwelling units¹. The official cannot issue a permit that conflicts with applicable zoning, building-code or planning-board rules¹. Municipalities may set their own building-permit, inspection and occupancy-certificate fee schedules, so request the current local schedule¹.

Rockingham County does not have zoning power or other authority to regulate land use within its municipalities, so zoning approval must be checked with the town or city containing the parcel, while septic permits stay with the state^2,3. Rockingham County therefore imposes no county minimum dwelling size, setback or minimum lot size within its municipalities, but municipal zoning and subdivision rules and state requirements may still apply². Local rules vary: Exeter has its own zoning ordinance and map, with the planning board responsible for the ordinance¹¹. A municipality with zoning that permits single-family dwellings in the district must allow one attached or detached accessory dwelling unit as a matter of right, subject to permitted municipal and septic requirements¹². Fremont offers a sample of how strict a town can be: a recent variance application there noted that a two-lot subdivision needs 2 acres total, 1 acre of buildable land and 200 feet of frontage for each lot under Fremont's zoning ordinance, and that was a single town's rule, not a countywide one¹³. Municipal planning boards may adopt subdivision regulations and impose infrastructure conditions on plat approval¹⁴. Request the parcel's current zoning map, allowed-use table, dimensional standards and subdivision regulations before relying on a listing description.

The New Hampshire Department of Environmental Services administers septic approval in Rockingham County, while local approval may also be required³. A permitted New Hampshire septic-system designer must prepare and submit the proposed plans¹⁵. Obtain NHDES plan approval before constructing a building that will discharge sewage or constructing the disposal system; qualifying in-kind repairs or replacements may use a permit-by-rule route³. The completed system cannot be covered or operated until final inspection and approval¹⁶. Only 0.9% of county soils are rated without severe limitations for a conventional drain field, so make the site evaluation and septic design an early purchase contingency¹⁷. NHDES can be reached at 29 Hazen Drive, Concord, NH 03302-0095, or (603) 271-3503¹⁵.

Rockingham County imposes no county zoning restriction on tiny-home occupancy within its municipalities, but municipal land-use rules, building permits, and state water and wastewater requirements still apply². New Hampshire allows a municipality to permit a tiny house on an individual lot where single-family homes are allowed or as an accessory dwelling unit; a qualifying tiny house is 600 square feet or less excluding lofts and must meet the applicable state-code standards⁷. Residential RV occupancy on private land remains unconfirmed, so ask the parcel's municipal zoning and building offices before buying or moving an RV onsite^5,6. The reviewed campground rule addresses temporary recreational occupancy in campgrounds or camping parks, not year-round residence on a private parcel⁵. For off-grid sanitation, state approval is not required for a composting or incinerator toilet only when the structure has neither internal plumbing nor supplied water service; local law still matters¹⁸.

1. Identify the town or city containing the parcel, then request its zoning map, dimensional rules, fee schedule and permit checklist^1,2.

1. Confirm the local permit path and obtain a permit before covered work begins¹.

1. Hire a permitted New Hampshire septic-system designer and obtain NHDES approval before starting a building or system that will discharge sewage^3,15.

1. Confirm the required inspection stages; inspections under a state-issued permit must be requested by the permit holder before covered work is concealed¹⁹.

1. Obtain final septic inspection and operational approval before covering or using the system¹⁶.

1. Ask whether the municipality requires a certificate of occupancy before use; municipalities may adopt that requirement and enforce it after satisfactory inspections, but the rule is not uniform countywide¹. State-owned buildings use a separate state-fire-marshal process²⁰. An owner-builder must also submit the state energy-code as-built certification before occupancy, to the office that issues certificates of occupancy where the town has one²¹.

Start with buildability: confirm the municipal zoning district, allowed use, setbacks, access and permit process^1,2. If land will be divided, do not begin road construction, clearing, filling or other site alteration when subdivision-plan approval is required; preliminary testing needed for review is allowed³. Local subdivision regulations and state review may both matter¹⁴. Septic feasibility deserves special attention because only 0.9% of county soils are rated without severe limitations for a conventional drain field¹⁷. A public-sewer connection is required for covered buildings when sewer is within 100 feet, subject to municipal changes and approved waivers²². For a private well, the contractor must file a completion record within 90 days, but a universal permit for every ordinary well was not confirmed⁹. The effective property-tax rate is about 1.6%, and the median annual bill is about $7,512¹⁷.