Jefferson County, CO Building Safety: Electrical Permits (2026)
Key Facts
- Code adopted
- 2023 NEC (NFPA-70) + county supplement
- Effective date
- June 30, 2026 (Resolution CC26-095)
- Enforcing agency
- Jefferson County Building Safety Division
- State updates
- Automatic under C.R.S. §12-115-107(2)(a)
- Licensed electricians
- Exempt from county contractor license
- Appeal deadline
- 14 days to Board of Review
Summary
Electrical work in unincorporated Jefferson County must meet the 2023 National Electrical Code (NFPA-70) as amended by the county's Electrical Code Supplement. Building Safety enforces it, and any higher standard the state electrical board later adopts phases into county law automatically the next 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: ... e. The 2023 edition of the National Electrical Code (NFPA-70), as modified by the 2024 Jefferson County Electrical Code Supplement, and any subsequent modifications to, or newer versions of, the National Electrical Code adopted by the Colorado State Electrical Board pursuant to its authority under C.R.S. § 12-115-107(2)(a); ... 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, adopts the 2023 edition of the National Electrical Code (NFPA-70) as modified by the 2024 Jefferson County Electrical Code Supplement. §12-115-107(2)(a) becomes part of county law without a new BCC resolution. The policy supersedes and replaces every prior version of the county's electrical code and building code supplements as of the June 30, 2026 effective date. Electricians holding a Colorado state electrical license are excluded from Jefferson County's own contractor licensing program under the Building Contractor Licensing policy's definition of 'Building Contractor,' but the work itself still requires an electrical permit issued and inspected by the Building Safety Division's Building Official, with fees set by the adopted 2024 Building Code Supplements Fee Schedule.
Violations & Fines
If electrical work proceeds without the required permit, the Building Official can stop work on the project, refuse a certificate of occupancy or final inspection, or revoke an issued permit. A county-licensed contractor who skips a required permit or ignores the adopted Electrical Code can be fined, warned, or have a Class A, B, C, or Specialty license suspended or revoked, with a right to appeal a stop-work order or revocation to the Board of Review within 14 calendar days of the decision (17 if mailed).
Frequently Asked Questions
What electrical code does Jefferson County enforce?
Do state-licensed electricians need a Jefferson County contractor license?
Does the electrical code update automatically?
What can the county do if I skip an electrical permit?
Sources & Official References
Other rules in Jefferson County
Compare Jefferson County to another location·View the Colorado building safety overview
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