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Residential Plumbing Permit in Nampa, Idaho

Required for all plumbing piping and drainage work in Nampa residences, including fixture additions, water and sewer line work, and water heater replacements. Governed by the 2017 Idaho State Plumbing Code.

Verified 2026-06-29 · Source

When you need this permit

  • All plumbing piping and drainage work except emergency repairs to leaks or replacing broken fixtures in kind
  • Must be performed by a state-licensed journeyman plumber employed by an Idaho-licensed plumbing contractor Contractor
  • Excavation contractors for sewer/water service lines outside the building envelope must hold Idaho health district septic certification or Idaho public works excavator license
  • Homeowner exception: owner of R-3/U-1 occupancy may perform own plumbing if residing in dwelling within 180 days after completion
  • Hardship exception: immediate family member may perform work for family member unable to do so

Required documents

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Fee schedule

New residential dwelling (R-3/R-4) plumbing — under 2,000 sq ft habitable areaNampa Exhibit A — New Group R sub-contractor permit fee (covers installations within the dwelling unit)
$180.00 per dwelling unit
New residential dwelling (R-3/R-4) plumbing — 2,000+ sq ft habitable area
$325.00 per dwelling unit
Residential plumbing (additions/remodels) — base feeNampa Exhibit A — base fee for all residential sub-trade addition/remodel permits
$36.00 base
Sewer line (new or replacement)Nampa Exhibit A — Plumbing Extras
$55.00
Water line (new or replacement)Nampa Exhibit A — Plumbing Extras
$55.00
Fixtures (additions and remodels) — per fixtureNampa Exhibit A — Plumbing Extras; applies per toilet, sink, shower, bathtub, water heater, etc.
$15.00 per fixture
Reinspection (after first reinspection for same item)
$55.00 flat fee

Review timeline

Plan reviewTypical estimate — confirm current times with the Nampa building department
~3–7 business days

How long did your Residential Plumbing Permit permit actually take in Nampa?

Anonymous — one question, no email. Answers are combined and only shown once at least 5 people have reported.

Inspection process

  1. 1

    Underground / Slab Plumbing

    Before concrete pour — verify pipe slope, materials, cleanouts; AM inspection available in applicable zones

  2. 2

    Rough-In

    After pipes installed, before walls closed — pressure test required

  3. 3

    Final

    All fixtures connected, no leaks, proper venting verified

See the full Nampa inspection guide — scheduling & re-inspection fees →

Tips

  • Nampa uses the 2017 Idaho State Plumbing Code (based on the 2015 Uniform Plumbing Code) — not the International Plumbing Code.
  • Idaho and Nampa's code allow homeowners to perform their own plumbing on their primary or secondary residence without a plumbing contractor license, provided they will reside in the home within 180 days of completion. Contractor
  • Sewer and water line replacements outside the building envelope require the contractor to hold an Idaho excavator license or health district septic certification.
  • Water heater replacement costs $36 base + $15 fixture fee = $51 total for a permit in Nampa.

Frequently asked questions

Yes. Water heater replacement requires a plumbing permit. The fee is $36 base plus $15 per fixture (water heater counts as one fixture) = $51 total per Nampa's Exhibit A fee schedule. Homeowners may pull their own permit.

In Nampa, the published New residential dwelling (R-3/R-4) plumbing — under 2,000 sq ft habitable area is: $180.00 per dwelling unit. Additional published fees: New residential dwelling (R-3/R-4) plumbing — 2,000+ sq ft habitable area — $325.00 per dwelling unit; Residential plumbing (additions/remodels) — base fee — $36.00 base; Sewer line (new or replacement) — $55.00; Water line (new or replacement) — $55.00; Fixtures (additions and remodels) — per fixture — $15.00 per fixture; Reinspection (after first reinspection for same item) — $55.00 flat fee. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Plan review for a residential plumbing permit in Nampa typically runs 3–7 business days. This is an estimate, not a published figure — confirm current review times with Nampa Building Safety & Code Department at (208) 468-5435.

You'll need: Plumbing Permit Application (2024). See the required-documents checklist on this page for details on each.

Nampa requires 3 inspection(s) for a residential plumbing permit, in order: Underground / Slab Plumbing, Rough-In, Final. Schedule each through Nampa Building Safety & Code Department ((208) 468-5435).

Apply through Nampa Building Safety & Code Department at 500 12th Ave South, Nampa, ID 83651. Phone: (208) 468-5435, email: buildinginspections@cityofnampa.us. Office hours: Mon–Fri 8:00 AM – 5:00 PM. Official information: https://www.cityofnampa.us/163/Building-Safety-Code.

Nampa, Idaho has adopted: 2018 International Residential Code (IRC); 2018 International Building Code (IBC); 2018 International Existing Building Code (IEBC); 2018 International Fire Code (IFC); 2018 International Energy Conservation Code (IECC) — Residential and Commercial; 2018 International Mechanical Code (IMC); 2018 International Fuel Gas Code (IFGC); 2017 Idaho State Plumbing Code; 2023 National Electrical Code (NEC); 2009 ICC/ANSI/A117.1 (Accessibility); 2015 NFPA A30 Code for Motor Fuel Dispensing Facilities and Repair Garages; 2015 NFPA 99 Health Care Facilities Code. Local amendments apply — see the Nampa overview page for the full list.

Nampa has adopted the 2017 Idaho State Plumbing Code, which is based on the 2015 Uniform Plumbing Code (UPC). This differs from the International Plumbing Code (IPC) used in many other states.

Sources & verification

Verified against official sources. Last reviewed 2026-06-29.

Fees, timelines, and adopted codes are researched from each jurisdiction's published records — see how we verify. Requirements change and vary by project, so always confirm the current details with the Nampa building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

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