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Plumbing Permit in Longmont, Colorado

Required for plumbing installations, alterations, and repairs in Longmont. Plumbing contractors must hold a Colorado State Master Plumber License AND a Colorado State Plumbing Contractor License, then register with the City of Longmont for a $75 fee (Class D specialty registration).

Verified 2026-06-30 · Source

When you need this permit

  • Building permit required for any changes to plumbing services
  • Plumbing contractors must submit a copy of their Colorado State Master Plumber License and Colorado State Plumbing Contractor License to register with the City of Longmont Contractor
  • City registration fee of $75.00 required upon application approval
  • Proof of liability insurance required: $1,000,000 CSL / $2,000,000 general aggregate / $2,000,000 products-completed aggregate, naming City of Longmont as certificate holder Contractor
  • Homeowners may self-perform plumbing work on their own primary residence; subcontracted plumbing work must be performed by a contractor licensed to work in Longmont Owner-builderContractor

Required documents

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Fee schedule

Water Heater ReplacementCity of Longmont FY2026 Fee Manual, Other Permits — Residential/Commercial table
$40.00
Lawn SprinklersFY2026 Fee Manual
$30.00
General Plumbing Permit (not separately listed in flat-fee table)FY2026 Fee Manual: 'Fees for plumbing permits, mechanical permits, electrical permits, and other miscellaneous permits and commercial work not listed above shall be based on actual contract amount of the work from the primary fee table'
Based on actual contract amount of the work applied to the Primary Fee Table
Plan Review Fee (plumbing permit not part of a combination permit)FY2026 Fee Manual, Plan Review Fees table
50% of total permit fee
City Contractor Registration — Plumbing (Class D)FY2026 Fee Manual, Contractor License Fees table: 'Class D, Plumbing and Mechanical — $75 + $25*'; Contractor License Application confirms 'A fee of $75 is required upon application approval' for Plumbing
$75.00 upon application approval

Review timeline

Plan reviewTypical estimate — confirm current times with the Longmont building department
~0–0 business days

How long did your Plumbing Permit permit actually take in Longmont?

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

Inspection process

  1. 1

    Underground / Under-slab

    Before concrete pour — pipe slope, materials, cleanouts

  2. 2

    Rough-In

    After pipes installed, before walls closed

  3. 3

    Final

    All fixtures connected, no leaks, proper venting verified

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

Tips

  • Longmont requires a $75 city registration fee for plumbing contractors, unlike electrical (no additional city fee beyond the one-time $25 sales/use tax charge for new contractors) — budget for this difference.
  • Water heater replacement is a flat $40 permit — one of the least expensive permit types in Longmont's fee schedule.
  • As with electrical, a Colorado State Master Plumber License and State Plumbing Contractor License are prerequisites to the City of Longmont's own contractor registration — Longmont does not operate independently of the state licensing framework. Contractor

Frequently asked questions

Longmont requires a plumbing permit for: Building permit required for any changes to plumbing services; Plumbing contractors must submit a copy of their Colorado State Master Plumber License and Colorado State Plumbing Contractor License to register with the City of Longmont; City registration fee of $75.00 required upon application approval; Proof of liability insurance required: $1,000,000 CSL / $2,000,000 general aggregate / $2,000,000 products-completed aggregate, naming City of Longmont as certificate holder; Homeowners may self-perform plumbing work on their own primary residence; subcontracted plumbing work must be performed by a contractor licensed to work in Longmont. If your project isn't listed, confirm with City of Longmont — Building Services (Building Inspection Division), Development Services Center at (303) 651-8332 before starting work.

A water heater replacement permit is a flat $40.00 fee per the City of Longmont FY2026 Fee Manual, Other Permits — Residential/Commercial table.

Plan review for a plumbing permit in Longmont typically runs 0–0 business days. This is an estimate, not a published figure — confirm current review times with City of Longmont — Building Services (Building Inspection Division), Development Services Center at (303) 651-8332.

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

Longmont requires 3 inspection(s) for a plumbing permit, in order: Underground / Under-slab, Rough-In, Final. Schedule each through City of Longmont — Building Services (Building Inspection Division), Development Services Center ((303) 651-8332).

Apply through City of Longmont — Building Services (Building Inspection Division), Development Services Center at 385 Kimbark St., Longmont, CO 80501. Phone: (303) 651-8332, email: building.inspection@longmontcolorado.gov. Office hours: Mon–Fri, 8 a.m.–5 p.m. (closed Federal holidays, Veterans Day, and the day after Thanksgiving; Building Inspection closed 10–11 a.m. on the 2nd and 4th Thursday for staff training). Official information: https://longmontcolorado.gov/building-inspection/permits/.

Longmont, Colorado has adopted: 2021 International Building Code (IBC) — adopted effective January 1, 2022; currently in force citywide; 2021 International Residential Code (IRC) — adopted effective January 1, 2022; currently in force citywide; 2021 International Energy Conservation Code (IECC) — adopted as part of the 2021 International Codes package effective January 1, 2022; 2021 International Fire Code (IFC) — adopted effective January 1, 2022; International Plumbing Code (IPC) and International Mechanical Code (IMC) / International Fuel Gas Code (IFGC) — adopted as part of the 2021 International Codes package effective January 1, 2022 (edition confirmed via Longmont's 2021 IBC/IRC Geographic Climatic Data Table; individual plumbing/mechanical/fuel-gas amendment ordinance text not independently re-verified beyond the city's codes-adoption page); 2023 National Electrical Code (NEC) — adopted with Longmont amendments, effective July 24, 2024; PENDING — NOT YET EFFECTIVE: 2024 International Codes plus the Colorado Energy Code Cohort's model amendments were scheduled for Longmont City Council consideration May 12, 2026, with an anticipated effective date of July 1, 2026. As of this extraction (lastVerified 2026-06-30), the City's own Building Code Update page still describes this as a pending/anticipated action, not a confirmed adopted-and-effective ordinance — DO NOT treat the 2024 codes as adopted until the city's codes page or Municode ordinance list confirms passage.. Local amendments apply — see the Longmont overview page for the full list.

The City of Longmont's Building Services division issues and reviews plumbing permits for work inside city limits. Plumbing contractors must first hold a Colorado State Master Plumber License and Colorado State Plumbing Contractor License (via DORA), then register with the City of Longmont (Class D Plumbing registration, $75 fee) before pulling permits.

Sources & verification

Verified against official sources. Last reviewed 2026-06-30.

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 Longmont building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

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Plumbing Permit in other cities

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