Plumbing Contractor Permit Requirements in Boise, ID

Complete permit and license guide for starting a plumbing contractor in Boise, Ada County, Idaho.

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 Idaho

1 stop

  1. Idaho State Tax Commission — Sales Tax Permit

    Required for all businesses selling taxable goods or services in Idaho. Idaho charges a 6% state sales tax. Some cities have local option taxes. Register with the Idaho State Tax Commission online.

    Official government source

    FreeImmediate (online via TAP)

City of Boise / Ada County

3 stops

  1. Idaho Division of Building Safety — Plumbing Contractor License

    Plumbing contractors in Idaho must hold a Plumbing Contractor License from the Idaho Division of Building Safety. A licensed journeyman plumber must be on staff.

    Official government source

    $100–$200 (initial)4–8 weeks

  2. City of Boise Planning and Development Services — Business License

    Boise does not have a general business license requirement, but businesses must comply with zoning, building permits, and applicable specialty licenses. 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. Ada County / Boise 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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