Energy Calculations


Based on Climate Zone 5 per the 2018 International Energy Conservation Code.

All projects must meet or exceed the requirements of the 2018 IECC, ASHRAE/IESNA 90.1 or simulated energy performance analysis per the 2018 IECC. Simulated energy methods per Section 407 will be permitted on the plans with a PE stamp on the drawings.

New commercial buildings or commercial additions will require COMcheck or prescriptive measures of Chapter 5, 2018 IECC for the building thermal envelope, mechanical systems and electrical/lighting.

Tenant Finishes and changes of occupancy will require COMcheck for mechanical and interior lighting.

New Homes - Four Methods

  • UA alternative per the 2018/REScheck
  • Prescriptive per 2018 IECC Chapter 4
  • Performance per section 405 of the 2018 IECC
  • Professional design

Additions, Alterations or Repairs - Two Methods

  • Professional design
  • Prescriptive per 2018 IECC Chapter 4

For more information on energy calculations, visit the Colorado Energy Office website.