Currently Adopted Building & Energy Codes
2021 International Codes Adoption
On January 24th, 2023 Aspen City Council passed Ordinance #1, 2023 which adopted the 2021 I-Codes, along with local building and energy code amendments. The updates include an expansion to the Renewable Energy Mitigation Program (REMP) and other measures focused on energy conservation, wildfire resiliency, and lowering emissions.
Current Building Codes - 2021 *
*2021 Codes apply to all permits submitted after March 31st, 2023.
Past Building Codes & Guides - 2015 **
Climate & Geographical Design Criteria
Table R301.2 (1) as amended
|Ground snow load||100 psf|
|Wind Speed / Exposure Category||89 / B|
|Seismic design category||C|
|Frost line depth||36 inches|
|Termite||None to slight|
|Decay||None to slight|
|Winter design temp||-15 degrees F|
|Summer design temp||82 degrees F|
|Ice shield underlayment required||Yes|
|Air Freezing index||2000|
|Mean annual temperature||40 degrees|
|Free Versions of the Codes||Adopted Appendices|
|2015 International Building Code||C, E, I, J|
|2015 International Residential Code - Chapters 1-10 Only!||E, F, H, J, K, R, S, U|
|2015 International Energy Conservation Code|
|2015 International Plumbing Code|
|2015 International Mechanical Code|
|2015 International Fuel Gas Code|
|2015 International Fire Code|
|2015 International Existing Building Code|
|2015 International Swimming Pool and Spa Code|
|2015 International Solar Energy Provisions|
|ICC A117.1-2009 Accessible and Usable Buildings and Facilities|
|2020 National Electric Code|
Additional Information on Energy Code Compliance
- To download COMcheck and REScheck software and other energy code resources visit the U.S Department of Energy website.
- To show compliance on windows and doors that do not have a NFRC label:
Renewable Energy Mitigation Program (REMP)
Use the spreadsheet below to calculate your required offsets and / or fee payment for snowmelt, outdoor pools and spas, heat tape, fireplaces. There are separate tabs for instructions, residential and commercial worksheets, PV, Solar Thermal, and Ground Source HeatPump Source Certification.
- 2021 Aspen Energy Code REMP Calculations - Instructions, Worksheets, GSHPS
- 2015 IECC REMP Calculations * for projects submitted prior to March 31, 2023.