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Office of Public Safety and Inspections (OPSI) Guidance and Education

Guidance documents and education materials for building officials from the Office of Public Safety and Inspections (OPSI).
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Guidance

Short term rental guidance for 1 & 2 family dwellings

Guidance for periodic inspections and sprinkler systems for short term rentals in 1 & 2 Family Dwellings per 780 CMR 10th Edition.

Mini-split permit and CSL guidance for 1 & 2 family dwellings

Guidance for permitting and the CSL requirements of ductless mini-split systems installed in 1 & 2 family dwellings per 780 CMR 10th Edition.

Education

Updates to the Existing Building Code – 780 CMR Ch. 34 10th Edition

An education and training document used for District Meetings on the Existing Building Code and 780 CMR Ch 34 10th Edition. This document covers how to use this section of the code, how it interacts with 780 CMR 10th Edition, and an overview of the different compliance methods. 

Other State Agency Resources

Other state agencies of the Commonwealth of Massachusetts also provide education and training that covers parts of or works in tandem with 780 CMR 10th Edition. OPSI will cross-post the education materials as they are posted.

Department of Conservation & Recreation Floodplain Management Training Calendar

Disclaimer

DOL/OPSI provides these documents as guidance resources only and not official interpretations or directives. Each building official is responsible for enforcement of 780 CMR within their jurisdiction. Questions about specific projects or specific code sections should be directed to the municipal or state building official having jurisdiction. 

Contact

Online

Email Director of Building and Engineering Education, Training, and Code at bo-education@mass.gov
Last updated: December 30, 2025

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