Jurisdiction directory

New Hampshire home project permits by county

Many New Hampshire households live outside city limits, where the county building department — not a city — issues the permit. 5 New Hampshire counties, covering the state's largest jurisdictions, are inventoried here.

Model reviewed August 2026

Counties covered

largest jurisdictions first

Municipalities tracked

in New Hampshire

Population covered

1.1M

residents in listed counties

Code basis

Statewide

New Hampshire State Building Code, based on the IRC

Featured counties

The largest and most active permit jurisdictions in the state.

Hillsborough County422,000 residents · seat Manchester Rockingham County316,000 residents · seat Brentwood Merrimack County155,000 residents · seat Concord Strafford County132,000 residents · seat Dover Grafton County92,000 residents · seat Haverhill

All New Hampshire counties we cover

5 counties, largest first.

Hillsborough CountySeat: Manchester · 422,000 residents Rockingham CountySeat: Brentwood · 316,000 residents Merrimack CountySeat: Concord · 155,000 residents Strafford CountySeat: Dover · 132,000 residents Grafton CountySeat: Haverhill · 92,000 residents

Sources

Sources & verification

New Hampshire Office of Professional Licensure

Model vintage August 2026. The links above are the issuing agencies' own pages — we publish them so you can confirm the current rule yourself, not as evidence that each fact on this page was re-checked with them today. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing, not quotes. Permit rules change; confirm with the building department before starting work.