Building Codes

Building codes are in place to protect public health, safety and general welfare as they relate to the construction and occupancy of buildings and structures. You can find the building codes that Jefferson County has adopted by type and effective dates on our Adopted Building Codes pages.

See our Code Books page to see how books can be purchased at the Jefferson County Building Safety division office. You can also check our Quick Code Check page for codes most frequently needed.

Important Notice: Check with your local fire district before starting your do-it-yourself, residential or commercial project. The local fire district has individual authority to enforce fire code standards beyond the county's requirements. Coordinating and cooperating with your local fire district early in the process may prevent costly alterations to your do-it-yourself, residential or commercial project and ensure compliance with all applicable health and safety standards.

Access Free Codes Online


2018 Changes to IRC IBC Supplements Effective 7/1/2021

  1. 2018 Proposed Changes to IRC and IBC Supplements (PDF)
  2. 2018 Jefferson County Residential Code Supplement July 2021(PDF)
  3. 2018 Jefferson County Building Code Supplement July 2021 (PDF)

Adopted Building Codes

Building codes are in place to protect public health, safety and general welfare as they relate to the construction and occupancy of buildings and structures. You can find the building codes that Jefferson County has adopted by type and effective dates.

Code Books for Sale

Books can be purchased at the Jefferson County Building Safety Division front counter: 100 Jefferson County Pkwy., Suite 3540, Golden, CO. All prices include applicable sales tax.

Quick Code Check

The following codes are all from the 2018 International Residential Code unless otherwise indicated.