# International Building Code > The 2009 International Building Code, the base code of the Massachusetts 8th Edition State Building Code (780 CMR), effective August 2010. - Canonical: https://harth.build/resources/building-codes/us-states/massachusetts/ibc-2009/ - Last updated: 2026-06-25 ## Direct answer and reference scope International Building Code is presented here as a reference within the IBC 2009 collection for Massachusetts. The 2009 International Building Code, the base code of the Massachusetts 8th Edition State Building Code (780 CMR), effective August 2010. Use the [Massachusetts Board of Building Regulations and Standards](https://www.mass.gov/massachusetts-state-building-code-780-cmr) 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._ The 8th Edition Massachusetts State Building Code adopted the 2009 IBC as its base volume, with Massachusetts amendments, effective August 2010 until the 9th Edition in October 2017. It governs how buildings are classified, sized, and made safe to occupy 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%2Fmassachusetts%2Fibc-2009%2F - View this page in a browser: https://harth.build/resources/building-codes/us-states/massachusetts/ibc-2009/ - All resources for agents: https://harth.build/llms.txt