Carbon Monoxide Detector Information

Massachusetts Department of Fire Services information flyer

On March 31, 2006 a new law took effect that, upon sale or transfer, every building or structure occupied for residential purposes that contains fossil fuel burning equipment, or incorporates enclosed parking within its structure, requires the installation of carbon monoxide (CO) detectors.

CO detectors may be either: (1) battery powered, or (2) ac (alternating current) plug-in with battery back up using an outlet not controlled by a wall switch, or (3) ac hard wired with a battery back up, or (4) low voltage power system, or (5) a combination smoke/CO detector.

Detectors must be located on each level of the dwelling including habitable portions of basements, cellars, or attics.  CO detectors on a level with a sleeping area must be located within 10 feet of any bedroom door.

In accordance with Massachusetts General Law, Chapter 148, sections 26F and 26F½, before any residence may be sold or transferred, the dwelling unit must be equipped with smoke and carbon monoxide detectors and an inspection of the detectors must be made by the Fire Department and a Certificate of Compliance issued.

For further questions or to schedule an inspection please call the Fire Department at (781) 862-0272.  The fee for this inspection is $50.00, payable to the Town of Lexington.  In addition, house numbers must be visible from the street (M.G.L. c.148 §59.)