Plumbing Contractor Permit Requirements in Louisville, KY

Complete permit and license guide for starting a plumbing contractor in Louisville, Jefferson County, Kentucky.

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 Kentucky

1 stop

  1. Kentucky Department of Revenue — Sales and Use Tax Permit

    Required for all businesses selling tangible personal property or certain services in Kentucky. Kentucky charges a flat 6% state sales tax with no local sales taxes (most transactions). Certain services including telecommunications, digital products, and some repair services are also taxable. Register online with the Kentucky Department of Revenue.

    Official government source

    FreeImmediate (online via Kentucky One Stop Business Portal)

City of Louisville / Jefferson County

3 stops

  1. Kentucky Division of Plumbing — Master Plumber License

    Plumbing contractors in Kentucky must hold a Master Plumber License from the Kentucky Division of Plumbing. Requires 4 years of journeyman experience and passing a state exam.

    Official government source

    $100–$200 (initial)4–8 weeks

  2. Louisville Metro Revenue Commission — Business License

    Louisville (Louisville Metro / Jefferson County) requires an Occupational License for all businesses. The Revenue Commission processes license applications and collections. 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. Jefferson County / Louisville 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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