Do You Need a Permit to Build a Fence in New Hampshire?

Last updated June 2026.

The General Rule in NH

New Hampshire does not have a statewide fence permit requirement. Fence regulations are handled at the municipal level, which means the rules change from town to town. Some municipalities require a permit for any fence. Others only require one if the fence exceeds 6 feet. A few have almost no restrictions at all.

The safest approach is to call your town's building department or planning office before ordering materials. We do this for every job as part of our free estimate process.

Fence rules are set locally through municipal zoning ordinances, enabled under New Hampshire RSA 674 (Local Land Use Planning and Regulatory Powers). This guide summarizes common town requirements as of June 2026 and is not legal advice. Confirm specifics with your town's office.

Common Height Restrictions

Most NH municipalities follow a similar pattern:

• Rear and side yards: 6 feet maximum
• Front yards: 4 feet maximum (sometimes 3 feet)
• Corner lots: sight-line setbacks may reduce allowed height near intersections
• Pool enclosures: minimum 48 inches required by NH code, regardless of town

Some towns allow taller fences with a variance or conditional use permit. If you need more than 6 feet for privacy or security, ask about the variance process during the permit application.

Fencing a pool? The permit is only half the job. Our NH pool fence code guide walks through the barrier height, gate, and gap specs your inspector will measure.

Setback Requirements

Most towns require fences to be set back from the property line by 6 inches to 2 feet. This prevents encroachment disputes with neighbors and ensures maintenance access on both sides.

We always recommend getting a property survey if you're unsure where your line falls. A $300 survey is much cheaper than moving a fence after it's installed.

Permit Requirements by Town

• Nashua: Permit required. Fence and wall permits go through the Building Safety Department, residential fences are capped at 7 feet under the city's land use code, and fences can't create sight-line problems at corners or driveways.
• Manchester: Permit needed over 6 feet. Fences at or below 6 feet generally don't need one, but setback rules still apply.
• Bedford: Varies. Town zoning applies plus HOA restrictions in many neighborhoods. Check covenants first.
• Merrimack: Permit required. Height and material restrictions vary by zone.
• Hudson: Permit needed over 6 feet. Front yard fences limited to 4 feet.
• Londonderry: Zoning permit required. 6-foot max in residential zones.
• Dover: Building permit required for all fences. Shoreland setback rules apply near rivers.
• Portsmouth: Permit required. Historic district overlay adds material and style restrictions in some areas.
• Exeter: Building permit required. Flood zone properties have additional elevation requirements.
• Hampton: Permit required. Coastal zone setbacks and wind-load requirements apply near the beach.

This list covers major service area towns. Regulations change. Always confirm with your local building department before starting a project.

The Frost Line Rule

Regardless of permit requirements, every fence post in New Hampshire should be set below the frost line. This isn't optional. Posts set above frost depth will heave out of the ground during freeze-thaw cycles, causing leaning panels, broken rails, and cracked concrete footings.

We set every post at 54-60 inches in concrete. It costs the same amount of concrete. It takes the same amount of time. There is no reason to cut this corner.

HOA Restrictions

Many Southern NH neighborhoods have HOA covenants that go beyond town zoning. Common HOA restrictions include:

• Approved fence materials only (often no chain link in front-facing areas)
• Color restrictions (white or tan vinyl only)
• Maximum heights below the town's allowance
• Required architectural review before installation

Always check your HOA covenants before ordering materials. We can help you navigate HOA requirements and suggest compliant designs during the estimate.

Sources

• NH RSA 674, Local Land Use Planning and Regulatory Powers (the statute that lets towns set their own zoning and fence rules) (NH General Court)
• City of Nashua Fence-Wall Permit Application (PDF, nashuanh.gov)
• Protected Shoreland rules under the Shoreland Water Quality Protection Act, RSA 483-B (NH Department of Environmental Services)
• Dig Safe System, the free utility-marking service covering New Hampshire (digsafe.com)