Colorado mandatory codes starting January 1,2019

July 23, 2018

The following notification is as received from the state of Colorado regarding a Code change effective 07-01-18, with a 180-day transition period. From July 1, 2018 to December 31, 2019 Plans may be submitted to prior codes or the newly adopted codes. The entire set of either prior or new codes must be used. Starting on January 1, 2019 all plan submittals must be to the newly adopted codes. All units constructed after this date must comply with the newly adopted codes (based on the manufactured date)


The mandatory codes starting on January 1, 2019 are:

2018 International Building Code (IBC)

2018 International Residential Code (IRC)

2018 International Mechanical Code (IMC)

2018 International Plumbing Code (IPC)

2017 National Electric Code (NEC) as adopted by the State Electrical Board at the time of plan submittal. A transition period of 180 days applies.

2018 International Fuel Gas Code (IFGC)

2015 International Energy Conservation Code (IECC)


Factories that utilize structural packages will need to submit new structural packages designed to the newly adopted codes prior to or at the same time of the first plan submittal that uses the new codes. QA Manuals should be reviewed for code references and revisions submitted as required to comply. There is no fee for revisions to structural packages or to the QA Manuals.