Plumbing Contractor Permit Requirements in Nashua, NH

Complete permit and license guide for starting a plumbing contractor in Nashua, Hillsborough County, New Hampshire.

Updated 2026-03-15 5 stops $400–$1,200 est. 4–10 weeks to obtain all licenses
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Not legal advice. Requirements may change — always verify with your local government authority before applying. This guide was compiled from public and official sources (last updated ) and has not yet been independently source-verified — confirm each requirement before acting on it.

Federal — start here

1 stop

  1. EIN (Employer Identification Number)

    Required if you have employees or operate as an LLC or corporation. Free from the IRS.

    Official government source

    FreeImmediate (online application)

State of New Hampshire

1 stop

  1. New Hampshire — No Sales Tax

    New Hampshire has no state sales tax and no local sales taxes. Businesses do not need a sales tax permit. However, businesses may be subject to the Business Profits Tax (BPT) and Business Enterprise Tax (BET). Register with the NH Department of Revenue Administration.

    Official government source

    Free (business tax registration)Immediate (online)

City of Nashua / Hillsborough County

3 stops

  1. New Hampshire Plumbers Licensing Board — Master Plumber License

    Plumbing contractors in New Hampshire must hold a Master Plumber License from the NH Plumbers Licensing Board. Requires apprenticeship experience and passing a state exam.

    Official government source

    $100–$200 (initial)4–8 weeks

  2. City of Nashua City Clerk — Business License

    Nashua requires a Business License for regulated business types. Contact the City Clerk for requirements applicable to your business category. This license must be renewed annually and displayed at your place of business.

    $50–$500/year depending on business type and gross revenues1–3 weeks

  3. Hillsborough County / Nashua Plumbing Permit (per project)

    A separate permit must be pulled with the local building/plumbing department for each job. Inspections are required upon job completion.

    Official government source

    $50–$300 per project1–5 business days

Terminus

Open for business — est. $400–$1,200 · 4–10 weeks to obtain all licenses

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Official Sources

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