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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 2026-07-16 · 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 24.39.20 (renumbered from 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 Owner-builder

Required documents

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Fee schedule

New Residential Plumbing — One and Two-Family Dwelling under 2,000 sq ft habitable areaCaldwell Resolution No. 300-25, Table 5; base permit fee $0
$160.00 per dwelling unit
New Residential Plumbing — One and Two-Family Dwelling 2,000+ sq ft habitable areaResolution No. 300-25, Table 5
$255.00 per dwelling unit
Other Residential Plumbing — Base permit feeResolution No. 300-25, Table 6; applies to all other/add-on residential plumbing permits
$34.00
FixturesResolution No. 300-25, Table 6; applies to toilets, sinks, showers, water heaters, etc.
$15.75 per fixture
Sewer LineResolution No. 300-25, Table 6
$35.00
Water LineResolution No. 300-25, Table 6
$35.00
Manufactured HomeResolution No. 300-25, Table 6
$55.00
Lawn SprinklersResolution No. 300-25, Table 6
$15.75
Water SoftenersResolution No. 300-25, Table 6
$15.75
Reinspection (3rd inspection / 2nd reinspection for same segment)Resolution No. 300-25, Section V-C
$60.00

Review timeline

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

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

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

  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 Caldwell inspection guide — scheduling & re-inspection fees →

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

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).

In Caldwell, the published New Residential Plumbing — One and Two-Family Dwelling under 2,000 sq ft habitable area is: $160.00 per dwelling unit. Additional published fees: New Residential Plumbing — One and Two-Family Dwelling 2,000+ sq ft habitable area — $255.00 per dwelling unit; Other Residential Plumbing — Base permit fee — $34.00; Fixtures — $15.75 per fixture; Sewer Line — $35.00; Water Line — $35.00; Manufactured Home — $55.00; Lawn Sprinklers — $15.75; Water Softeners — $15.75; Reinspection (3rd inspection / 2nd reinspection for same segment) — $60.00. 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 Caldwell typically runs 3–7 business days. This is an estimate, not a published figure — confirm current review times with City of Caldwell Department of Building Safety at (208) 455-3024.

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

Caldwell requires 3 inspection(s) for a residential plumbing permit, in order: Underground / Slab Plumbing, Rough-In, Final. Schedule each through City of Caldwell Department of Building Safety ((208) 455-3024).

Apply through City of Caldwell Department of Building Safety at 205 South 6th Ave, Caldwell, ID 83605. Phone: (208) 455-3024, email: rcollins@cityofcaldwell.org. Office hours: Mon–Fri (inspection requests must be called in by 7:00 AM for same-day scheduling). Official information: https://www.cityofcaldwell.org/Departments/Community-Development/Building-Safety-Division.

Caldwell, Idaho has adopted: 2018 International Residential Code (IRC) — Parts I, II, III, IV and IX; 2018 International Building Code (IBC); 2018 International Existing Building Code (IEBC); 2018 International Fire Code (IFC); 2023 National Electrical Code (NEC) — Administrative Rules IDAPA 24.39.10 (Rules of the Idaho Electrical Board; renumbered from IDAPA 07.01.01–07.01.11); 2018 International Mechanical Code (IMC); 2018 International Fuel Gas Code (IFGC); 2017 Idaho State Plumbing Code — Based on the 2015 Uniform Plumbing Code; Administrative Rules IDAPA 24.39.20 (Rules Governing Plumbing; renumbered from IDAPA 07.02.02–07.02.07); 2018 International Energy Conservation Code (IECC) with State Amendments; 2018 International Property Maintenance Code; 1997 Uniform Code for the Abatement of Dangerous Buildings; 1997 Uniform Sign Code. Local amendments apply — see the Caldwell overview page for the full list.

Caldwell uses the 2017 Idaho State Plumbing Code, which is based on the 2015 Uniform Plumbing Code (UPC) per Idaho Administrative Rules IDAPA 24.39.20 (renumbered from IDAPA 07.02.02–07.02.07).

Sources & verification

Verified against official sources. Last reviewed 2026-07-16.

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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