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.

**2015 Codes apply to all projects with master permits submitted between February 2017 and March 2023. 

If you have any questions, please reach out to our Chief Building Official Bonnie Muhigirwa, (970)309-5119.

Climate & Geographical Design Criteria

Table R301.2 (1) as amended 

Ground snow load100 psf
Wind Speed / Exposure Category89 / B
Seismic design categoryC
Frost line depth36 inches
TermiteNone to slight
DecayNone to slight
Winter design temp-15 degrees F
Summer design temp82 degrees F
Ice shield underlayment requiredYes
Flood hazards
Air Freezing index2000
Mean annual temperature40 degrees

Additional Information on Energy Code Compliance

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.