Plumbing Contractor Permit Requirements in Green Bay, WI

Complete permit and license guide for starting a plumbing contractor in Green Bay, Brown County, Wisconsin.

Updated 2026-03-14 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 Wisconsin

1 stop

  1. Wisconsin Department of Revenue — Seller's Permit

    Required for all businesses selling tangible personal property, certain services, or digital products in Wisconsin. Wisconsin charges a 5% state sales tax; local county taxes may apply (0.5%). Free to obtain from the Wisconsin DOR.

    Official government source

    FreeImmediate (online via My Tax Account)

City of Green Bay / Brown County

3 stops

  1. Wisconsin Department of Safety and Professional Services — Master Plumber License

    Plumbing contractors in Wisconsin must be licensed as Master Plumbers by DSPS. Requires 5 years of apprenticeship and passing a state exam.

    Official government source

    $100 (initial)4–8 weeks

  2. City of Green Bay Office of the City Clerk — Business License

    Green Bay requires a Business License from the City Clerk for certain business types operating within city limits. This license must be renewed annually and displayed at your place of business.

    Official government source

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

  3. Brown County / Green Bay 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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