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
- 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
- Req
Plumbing Permit Application (2024)
Nampa Building Department plumbing permit application; available at cityofnampa.us/DocumentCenter/View/18815
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| New residential dwelling (R-3/R-4) plumbing — under 2,000 sq ft habitable area | $180.00 per dwelling unit | Nampa Exhibit A — New Group R sub-contractor permit fee (covers installations within the 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 fee | $36.00 base | Nampa Exhibit A — base fee for all residential sub-trade addition/remodel permits |
| Sewer line (new or replacement) | $55.00 | Nampa Exhibit A — Plumbing Extras |
| Water line (new or replacement) | $55.00 | Nampa Exhibit A — Plumbing Extras |
| Fixtures (additions and remodels) — per fixture | $15.00 per fixture | Nampa Exhibit A — Plumbing Extras; applies per toilet, sink, shower, bathtub, water heater, etc. |
| Reinspection (after first reinspection for same item) | $55.00 flat fee | — |
Review timeline
~3–7 business days
Typical estimate — confirm current times with the Nampa building department
Inspection process
- 1
Underground / Slab Plumbing
Before concrete pour — verify pipe slope, materials, cleanouts; AM inspection available in applicable zones
- 2
Rough-In
After pipes installed, before walls closed — pressure test required
- 3
Final
All fixtures connected, no leaks, proper venting verified
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.
- 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
- Do I need a permit to replace a water heater in Nampa?
- 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.
- What plumbing code does Nampa use?
- 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.
- Nampa Building Safety & Code Department — official building department
- Trade Permit Process — Plumbing | City of Nampa
- Plumbing Permit Application (2024)
- Nampa Exhibit A — Schedule of Permit Fees (Dec 21, 2021)
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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