Plumbing Contractor Permit Requirements in Nampa, ID

1. EIN (Employer Identification Number)

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

   Official government source

   Free·Immediate (online application)

   Free

   Immediate (online application)

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

   Free·Immediate (online via TAP)

   Free

   Immediate (online via TAP)

1. Idaho DOPL State Plumbing Board — Plumbing Contractor License

   Plumbing contractors in Idaho must hold a Plumbing Contractor License from the Idaho Division of Occupational and Professional Licenses (DOPL) State Plumbing Board, which absorbed the former Division of Building Safety in 2021. A licensed journeyman plumber must be on staff.

   Official government source

   $169.50 initial ($22.50 application fee + $147 license fee, 3-year term); $108 renewal·4–8 weeks

   $169.50 initial ($22.50 application fee + $147 license fee, 3-year term); $108 renewal

   4–8 weeks

2. No Nampa General Business License

   Nampa does not issue a general business license. The City Clerk licenses only specific regulated categories: alcohol and alcohol catering, amusement operators, animal/dog licences, concessions, massage establishments, motor escort services, pawnbrokers, peddlers and solicitors, private security/private investigators/alarm installers, special events, tree removal and pruning, and used precious-metal and jewelry dealers. Businesses outside those categories — contractors, salons, tutoring, real estate, insurance, notaries, pet services, auto repair, photography, cleaning, and the like — need no city business license. Zoning approval, a Certificate of Occupancy, and an In-Home Business registration for home-based operations may still apply.

   Official government source

   $0 — no general business license exists. Category-specific fees apply only to the licences listed above.·N/A for most businesses — nothing to apply for

   $0 — no general business license exists. Category-specific fees apply only to the licences listed above.

   N/A for most businesses — nothing to apply for

3. City of Nampa Plumbing Permit (per project)

   A plumbing permit must be pulled from the City of Nampa Building Safety & Code Division for each job inside city limits — Canyon County does not permit work in Nampa. Residential work is priced from a flat 'plumbing extras' list; commercial work uses a base fee plus a percentage of the scope-of-work valuation. Inspections are required at rough-in and completion, and starting work without a permit doubles the fee.

   Official government source

   $36 base permit fee plus residential extras ($55 sewer line, $55 water line, $15 per fixture on additions and remodels), or for commercial work 2.68% of project value up to $20,000 with lower marginal rates above that. New dwellings are flat-rated at $180 (under 2,000 sq ft) or $325 (2,000+). Re-inspections after the first are $55.·1–5 business days for straightforward permits; longer where plan review is required.

   $36 base permit fee plus residential extras ($55 sewer line, $55 water line, $15 per fixture on additions and remodels), or for commercial work 2.68% of project value up to $20,000 with lower marginal rates above that. New dwellings are flat-rated at $180 (under 2,000 sq ft) or $325 (2,000+). Re-inspections after the first are $55.

   1–5 business days for straightforward permits; longer where plan review is required.

Official Sources

• Idaho Division of Building Safety — Plumbing Contractor License
• City of Nampa City Clerk

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