# International Energy Conservation Code > The 2009 International Energy Conservation Code, incorporated into the Virginia Uniform Statewide Building Code (13VAC5-63), effective March 1, 2011. - Canonical: https://harth.build/resources/building-codes/us-states/virginia/iecc-2009/ - Last updated: 2026-06-25 ## Direct answer and reference scope International Energy Conservation Code is presented here as a reference within the IECC 2009 collection for Virginia. The 2009 International Energy Conservation Code, incorporated into the Virginia Uniform Statewide Building Code (13VAC5-63), effective March 1, 2011. Use the [Virginia Department of Housing and Community Development](https://www.dhcd.virginia.gov/virginia-uniform-statewide-building-code-usbc) to confirm the code edition currently adopted for the project, and compare the model text with state amendments, local amendments, effective dates and the permit authority's interpretation. The [ICC code library](https://codes.iccsafe.org/codes) is the model-code publication path. This Harth page is a searchable reference transcription, not an official code publication, legal opinion or confirmation that this edition controls a particular address. Record the project jurisdiction, application date, occupancy, construction type and amendment set before relying on a section. Where this page conflicts with an official publication or the authority having jurisdiction, the official source controls. _Authored and prepared by Harth. Review scope: official verification path added; code text and current local applicability have not been independently reviewed._ Virginia's 2009-cycle USBC referenced the 2009 IECC as the state energy standard, with Virginia amendments, effective March 1, 2011. It covers minimum energy-efficiency requirements for the building envelope, mechanical systems, lighting, and service water heating. The full text below is reproduced from the 2009 edition as adopted into law, sourced from public.resource.org. --- - Continue in Harth (open this topic in the Harth agent): https://app.harth.build/agent?context=%2Fresources%2Fbuilding-codes%2Fus-states%2Fvirginia%2Fiecc-2009%2F - View this page in a browser: https://harth.build/resources/building-codes/us-states/virginia/iecc-2009/ - All resources for agents: https://harth.build/llms.txt