Building Safety

Welcome to the Jefferson County Division of Building Safety home page. The division is entrusted with achieving compliance with applicable state laws and adopted building codes in regards to building design and construction within unincorporated Jefferson County. Is my address in unincorporated Jeffco?

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The County is adding an addendum to the 2018 Jefferson County Code Supplement. Appendix Z - Special Building Construction Regulations in Wildfire Zone 1. Proposed Effective Date January 1, 2020. NOTE: The requirements for Decks and Soffit Vents have been updated 08/23/2019.

Passive Radon Mitigation System Inspection is now required for new residential construction per R109.3.5 of the 2018 Jefferson County Residential Code Supplement.

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