Residential Plumbing Permit in Caldwell, Idaho
Required for all plumbing piping, drainage, and fixture work in Caldwell residences, including sewer and water line work and water heater replacements. Governed by the 2017 Idaho State Plumbing Code (based on the 2015 Uniform Plumbing Code).
Verified 2026-06-29 · Source
When you need this permit
- All plumbing installations, fixture additions, or piping modifications require a permit
- Work must comply with 2017 Idaho State Plumbing Code per Idaho Administrative Rules IDAPA 07.02.02–07.02.07
- Submit plumbing permit application through the Citizenserve portal or in person
- Licensed plumbing contractor required unless homeowner qualifies for owner-builder exemption under Idaho law
Required documents
- Req
Plumbing Permit Application
Caldwell Building Safety plumbing permit application; available at cityofcaldwell.org/files/assets/city/v/2/building/documents/permit-apps/plumbing-permit.pdf
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| New Residential Plumbing — One and Two-Family Dwelling under 2,000 sq ft habitable area | $160.00 per dwelling unit | Caldwell Resolution No. 300-25, Table 5; base permit fee $0 |
| New Residential Plumbing — One and Two-Family Dwelling 2,000+ sq ft habitable area | $255.00 per dwelling unit | Resolution No. 300-25, Table 5 |
| Other Residential Plumbing — Base permit fee | $34.00 | Resolution No. 300-25, Table 6; applies to all other/add-on residential plumbing permits |
| Fixtures | $15.75 per fixture | Resolution No. 300-25, Table 6; applies to toilets, sinks, showers, water heaters, etc. |
| Sewer Line | $35.00 | Resolution No. 300-25, Table 6 |
| Water Line | $35.00 | Resolution No. 300-25, Table 6 |
| Manufactured Home | $55.00 | Resolution No. 300-25, Table 6 |
| Lawn Sprinklers | $15.75 | Resolution No. 300-25, Table 6 |
| Water Softeners | $15.75 | Resolution No. 300-25, Table 6 |
| Reinspection (3rd inspection / 2nd reinspection for same segment) | $60.00 | Resolution No. 300-25, Section V-C |
Review timeline
~3–7 business days
Typical estimate — confirm current times with the Caldwell building department
Inspection process
- 1
Underground / Slab Plumbing
Before concrete pour — verify pipe slope, materials, cleanouts
- 2
Rough-In
After pipes installed, before walls closed — pressure test required
- 3
Final
All fixtures connected, no leaks, proper venting verified
Tips
- Caldwell uses the 2017 Idaho State Plumbing Code (based on the 2015 Uniform Plumbing Code), not the International Plumbing Code.
- Water heater replacement: $34 base + $15.75 fixture fee = $49.75 total for a plumbing permit.
- Call inspection line (208) 455-4605 by 7:00 AM for same-day inspection scheduling.
Frequently asked questions
- What plumbing code does Caldwell use?
- Caldwell uses the 2017 Idaho State Plumbing Code, which is based on the 2015 Uniform Plumbing Code (UPC) per Idaho Administrative Rules IDAPA 07.02.02–07.02.07.
- Do I need a permit to replace a water heater in Caldwell?
- Yes. Water heater replacement requires a plumbing permit. The fee is $34 base plus $15.75 per fixture (water heater = one fixture) = $49.75 per Caldwell's fee schedule (Resolution No. 300-25).
Sources & verification
Verified against official sources. Last reviewed 2026-06-29.
- City of Caldwell Department of Building Safety — official building department
- Plumbing Permit Application (PDF)
- Building Safety Fees — Resolution No. 300-25 (PDF)
- Code Resources & FAQs | City of Caldwell Building Safety
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 Caldwell building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.
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