IES tools meet the following approved international standards.

ASHRAE 140: 2001, 2004, 2007, 2014



EU EN13791: July 2000

IESVE is fully validated under ASHRAE Standard 140 and have published the results for all versions of ASHRAE Standard 140; 2001, 2004, 2007 and 2014 (Heating, Cooling and Envelope).


IES tools can undertake the following methodologies.

ASHRAE 55 Calculation Procedure

ASHRAE 62.1 Calculation Procedure

CIBSE Guide A/ISO 7730 Calculation procedure

UK National Calculation Methodology (NCM)

U.S. Department of Energy

Approved the use of IESVE for Federal Incentives - IRS Code 179D - Originally enacted under the Energy Policy Act (“EPAct”). 

Approval Document for IESVE 2018 Approval Document for IESVE 2017


IES is a LEED Automation partner. 

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Regulations/Rating Systems

IES offers more approved software solutions for compliance than any other vendor. Covering multiple building regulations and rating systems across the globe.

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South Africa National Building Regulations

Approved for Regulation XA3 of Part XA: Energy usage in buildings of the National Building Regulations.

California Energy Commission

Approved for Title 24 Non-residential Compliance. 

Florida Energy Commission

Approved for Commercial Energy Code Compliance.