NH Homeowner Guide
Do You Need a Permit to Build a Fence in New Hampshire?
The short answer: it depends on your town. Here's what you need to know before you start digging.
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.
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.
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
| Town | Permit? | Notes |
|---|---|---|
| Nashua | Required | Zoning permit required for most fences. 6' max rear/side, 4' max front. 3-5 business days processing. |
| Manchester | Over 6' | Fences at or below 6' generally don't need a permit. Setback rules still apply. |
| Bedford | Varies | Town zoning applies plus HOA restrictions in many neighborhoods. Check covenants first. |
| Merrimack | Required | Building permit required. Height and material restrictions vary by zone. |
| Hudson | Over 6' | No permit needed under 6'. Front yard fences limited to 4'. |
| Londonderry | Required | Zoning permit required. 6' max in residential zones. |
| Dover | Required | Building permit required for all fences. Shoreland setback rules near rivers. |
| Portsmouth | Required | Permit required. Historic district overlay adds material/style restrictions in some areas. |
| Exeter | Required | Building permit required. Flood zone properties have additional elevation requirements. |
| Hampton | Required | Permit required. Coastal zone setbacks and wind-load requirements apply near the beach. |
This table covers major service area towns. Regulations change. Always confirm with your local building department before starting a project.
The 48-Inch Frost Line Rule
Regardless of permit requirements, every fence post in New Hampshire should be set below the 48-inch 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.
Skip the Research
We Handle the Permits for You
Every free estimate includes a permit check for your specific property. We handle the paperwork, the city coordination, and the inspection scheduling.
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