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NH · County

Hillsborough County, NH.

Population: ~422,000. Most Contains Manchester and Nashua (two largest cities). Significant radon Southern New Hampshire

Coverage in progress
Adopted edition

Coverage in progress

Local amendments override state floor.

Design wind speed

95 mph

ASCE 7 Risk Cat II, 3-second gust at 33 ft. Drives fastener spacing, hold-downs, and opening protection.

Climate zone (IECC)

5A

Drives R-value, fenestration U-factor, and air-leakage envelope rules.

Special zones
  • HVHZ
  • WBDR
  • WUI
  • FEMA SFHA possible
Permit office

Hillsborough County County Building Department

Local conditions
  • County seat: Nashua

Common amendments + overlays

What's specific to this county.

  • §01 County has local amendments to the state floor — consult the building department.

Working in Hillsborough County?

Pull an address-level code packet for any property in Hillsborough County. SkyCanvass resolves the parcel, looks up the adopted edition + the Hillsborough County-specific amendments listed above, and emits a cited packet ready for permit submittal.

See the New Hampshire state overview for the broader context, or browse the state directory.

Pull a Hillsborough County code packet.

Free to start — property lookups, state code access, the hail map, and your first storm report on us. No credit card required to look up an address.