Jefferson County, CO Building Safety: Plumbing Permits (2026)
Key Facts
- Code adopted
- 2024 International Plumbing Code + county supplement
- Effective date
- June 30, 2026 (Resolution CC26-095)
- Enforcing agency
- Jefferson County Building Safety Division
- State updates
- Phase in automatically each following July 1
- Licensed plumbers
- Exempt from county contractor license, still need permit
- Appeal deadline
- 14 days to Board of Review (17 if mailed)
Summary
Plumbing work in unincorporated Jefferson County must meet the 2024 International Plumbing Code as amended by the county's own Plumbing Code Supplement. The Building Safety Division enforces it, and any tougher standard the state adopts phases into county law automatically each following July 1.
A. Adoption. 1. The Board of County Commissioners amends Jefferson County's building codes by adopting the following building codes (collectively, the "Jefferson County Building Codes"), effective June 30, 2026: ... c. The 2024 edition of the International Plumbing Code, as modified by the 2024 Jefferson County Plumbing Code Supplement, and any modifications to or newer versions of the Colorado Plumbing Code that are adopted by the Colorado State Plumbing Board pursuant to its authority under C.R.S. §12-155-106(2) which impose a higher standard shall be automatically incorporated herein and deemed to modify this code and shall become effective July 1 of the year following state adoption of such; ... 4. The Jefferson County Building Codes shall apply to all unincorporated areas of Jefferson County.
Full Breakdown
The Jefferson County Building Code policy (Part 3, Ch. 8, Sec. §30-28-204, took effect June 30, 2026 and applies to all construction in unincorporated Jefferson County. It adopts the 2024 International Plumbing Code as modified by the 2024 Jefferson County Plumbing Code Supplement, alongside the county's building, fuel gas, mechanical, energy conservation, existing building, and residential codes. §12-155-106(2) is incorporated into county law and becomes effective on July 1 of the year after the state adopts it, so the county doesn't have to re-pass its own resolution to keep pace.
Permit fees are set under the adopted 2024 Building Code Supplements Fee Schedule and Fee Refund Procedure. Plumbers who hold a Colorado state plumbing license are exempt from Jefferson County's separate contractor licensing program under the Building Contractor Licensing policy, but a plumbing permit under the adopted code is still required for the work itself, administered by the Building Safety Division's Building Official.
Violations & Fines
Working without a required plumbing permit lets the Building Official stop or suspend work on the project, refuse a certificate of occupancy or final inspection, or revoke an issued permit. A licensed contractor who fails to obtain a required permit or follow the Building Code can be fined, given a warning notice, or have a county license revoked or suspended; a person aggrieved by a stop-work order or permit revocation can appeal to the Board of Review within 14 calendar days (17 if mailed).
Frequently Asked Questions
What plumbing code does Jefferson County use?
Do I need a county contractor license to do plumbing work?
What happens if the state raises the plumbing code standard?
Can the county stop a plumbing job for an unpermitted violation?
Sources & Official References
Other rules in Jefferson County
Compare Jefferson County to another location·View the Colorado building safety overview
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