New Hampshire Building Permits — Complete Guide (2026)
Find, Apply & Track Permits in Cities and Counties Across New Hampshire
New Hampshire has a mandatory statewide building code but a strong tradition of local control. Manchester and Nashua lead in permit volume. NH has no income or sales tax, keeping permit fees generally reasonable.
How building permits work in New Hampshire
Building permit requirements and processing times in New Hampshire vary by city and county. Use the links below to apply, check status, schedule inspections and find permit information for your location.
Learn the step-by-step permit process →Not sure where to apply?
Enter your city or address to find your permit office.
Permit costs by type — New Hampshire
| Permit Type | Fee Range | Processing Time | Notes |
|---|---|---|---|
| Electrical | $100–$275 | 1–5 days | Licensed electrician required statewide |
| Plumbing | $90–$250 | 1–5 days | Licensed plumber required |
| HVAC / Mechanical | $100–$275 | 2–6 days | Oil heat conversion common |
| Roofing | $125–$350 | 1–4 days | Snow load design required statewide |
| New Construction | $600–$1,800 | 2–7 weeks | Rising costs due to population growth |
| Room Addition | $350–$950 | 2–5 weeks | Deep frost footings add cost |
| Deck / Patio | $150–$450 | 1–4 weeks | Frost depth 48–60 inches |
| ADU | $350–$900 | 2–5 weeks | 2023 law — municipalities must allow |
| Solar | $100–$275 | 1–5 days | Good net metering policy |
| Pool | $175–$500 | 1–4 weeks | Short season — permit still required |
Major New Hampshire cities — apply online
Most New Hampshire building permits are issued by cities. Click your city to access the permit portal, apply online, or check permit status.
Permit costs by county — top New Hampshire counties
County building departments handle unincorporated areas. Click a county to access its permit portal directly.
How to get a building permit in New Hampshire
Find your town building department
New Hampshire has 234 municipalities. Many small towns share a building inspector. Contact your town office to find the right contact.
Check for new ADU rules
Under RSA 674:71, all NH municipalities must allow at least one ADU per single-family lot. If your town previously prohibited ADUs, they may now be required to allow them.
Licensed contractor requirement
NH requires licensed electricians, plumbers, and mechanical contractors for all permitted trade work.
Submit application — mostly paper
Most NH towns still use paper applications. Manchester and Nashua have online portals. Budget extra time for smaller town processing.
Inspections
NH inspectors cover wide geographic areas in rural areas. Schedule inspections well in advance — 1–2 week waits are common outside Manchester/Nashua.
ADU permits in New Hampshire — what you need to know
🏠 New Hampshire ADU-friendly status: Yes — 2023 state law
New Hampshire passed HB 1661 in 2022 requiring municipalities to allow ADUs by right on single-family lots statewide. This overrides local restrictions. Most NH towns must permit attached or detached ADUs without requiring special exceptions or variances.
Find a licensed New Hampshire contractor
New Hampshire requires licensed professionals for most permitted work. Always verify a contractor's license before hiring — it protects you and is required for most permit types.
General Contractors
Find pre-screened general contractors for your New Hampshire home project. Compare quotes on permitted work.
Find a Contractor →Verify NH License
Verify your contractor holds a valid NH Office of Professional Licensure & Certification license before any permitted work begins.
Verify NH License →Electricians & Plumbers
Specialty-licensed electricians and plumbers are required for all permitted electrical and plumbing work in New Hampshire.
Learn More →Ready to get started? Browse verified, licensed contractors serving New Hampshire homeowners and get free quotes on your project.
🔍 Find a Contractor Near YouFrequently asked questions — New Hampshire permits
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