NORTHBRIDGE, Massachusetts — Lyon & Billard, a building materials supplier that has served homeowners and contractors in central Connecticut for more than 180 years, is being acquired by Koopman Lumber.

The announcement was made Thursday by Koopman Lumber, a third-generation, family-owned business that will soon operate at 17 locations in Massachusetts and Connecticut.

Lyon & Billard currently runs four locations in Connecticut, including in Berlin, Cheshire, Meriden and East Hampton. The company serves customers across Connecticut and in parts of Massachusetts, New York, Rhode Island and Vermont.

The acquisition has not yet been finalized, but both companies have entered into a definitive agreement and are transitioning. More updates are expected in the coming weeks, but it is busine

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