The Office of Public Safety and Inspections recognizes that ductless mini-split systems (mini-splits) have increased in prominence as standalone retrofit installations, and this document seeks to provide guidance on the permit and license requirements for their installation. This guidance covers standalone installations in one and two-family dwellings and NOT installations that are part of new construction or a larger renovation where they would be subject to the building permit for that other work. Our goal is to ensure consistent application of the Massachusetts Building Code across the Commonwealth while recognizing that the Building Official having jurisdiction must make individual determinations based on an application of the code to the specific facts before them.
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