Building Permits in New Hampshire

We cover 13 cities in New Hampshire. Select a city below to see local permit requirements.

13 Cities Covered

1,378 Permit Rules

IRC Building Code Base

Building Codes in New Hampshire

Building permit requirements in New Hampshire are enforced at the local level, each city and county building department sets its own rules, fees, and timelines. Most cities in New Hampshire follow the 2018 IRC, though 3 cities are still on the 2021 edition.

We cover 13 cities in New Hampshire with 1,378 specific permit rules. That's real, locally researched data, not generic advice. Each city page shows exactly what triggers a permit, what's exempt, estimated fees, and how to apply.

The bottom line: don't assume your city follows the same rules as the one next door. A fence that's exempt in one town might need a full permit two miles away. Always check your specific city.

Permit Fees Across New Hampshire

Across the 13 cities we cover in New Hampshire, permit fees range from $25 – $5,000. The average sits around $145 – $607.

Fees vary a lot by city and project type. A simple fence permit might run you $50, while a full room addition could be $2,000+. Most cities calculate fees based on your estimated project value, typically 1–2% of construction cost. Check the specific city page for accurate numbers.

Common Permit Exemptions in New Hampshire

These are the most common projects that don't require a permit across cities in New Hampshire. Keep in mind, "exempt from a permit" doesn't mean "exempt from code." You still have to build to code even without a permit.

Fence: Exempt in 26 of our 13 covered cities

Windows and Doors: Exempt in 23 of our 13 covered cities

Tree Removal: Exempt in 13 of our 13 covered cities

Siding: Exempt in 13 of our 13 covered cities

Shed: Exempt in 13 of our 13 covered cities

Exemptions vary by city. Always verify with your local building department before starting work.