November 30, 2021

Informational Bulletin for Residential Energy Storage Systems Under 2021 International Residential Code (IRC)

Clarifications on requirements for residential energy storage systems (ESS) as defined under the 2021 IRC

The purpose of this bulletin is to clarify specific requirements for residential energy storage systems (ESS) as defined under the 2021 International Residential Code (IRC), specifically focusing on product safety standard listing, code required marking, and to clarify allowable locations. There are other requirements in IRC Section R328 that are not within the scope of this bulletin.

Note: For jurisdictions using the 2018 IRC, see SEAC’s informational bulletin for that version of the code here.


This material is based upon work supported by the U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy (EERE) under the Solar Energy and Technologies Office Award Number DE-EE0009002.0001. The views expressed herein do not necessarily represent the views of the U.S. Department of Energy or the United States Government.