Carbon Monoxide Detector Laws for Massachusetts Hotels and Short-Term Rentals

Massachusetts hotel and short-term rental operators are governed by M.G.L. c. 148, § 26F½, commonly known as Nicole's Law, enacted in November 2005 with compliance required as of March 31, 2006. The law requires every building occupied in whole or in part for residential purposes, a definition that encompasses hotels, inns, lodging houses, and short-term rental units, to be equipped with working, approved carbon monoxide alarms, provided the building contains fossil-fuel burning equipment such as a furnace, boiler, water heater, or fireplace, or incorporates enclosed parking within its structure. The implementing regulation is 527 CMR 1.00, Chapter 13, Section 13.7.6, promulgated by the Massachusetts Board of Fire Prevention Regulations. Enforcement rests with the head of the local fire department. There is no construction-date cutoff: any qualifying building that triggers either condition must comply regardless of when it was built.

Nicole's Law covers every dwelling, building, or structure occupied in whole or in part for residential purposes that contains fossil-fuel burning equipment or enclosed parking. The phrase "occupied in whole or in part for residential purposes" is broad and encompasses hotels, motels, inns, lodging houses, boarding houses, and short-term rental units hosted within multi-unit residential buildings. A building does not need to be exclusively residential to fall under the law, partial residential use is sufficient. Short-term rental hosts operating within an apartment building, converted lodging house, or any multi-unit structure that contains a boiler, furnace, water heater, fireplace, or attached garage are covered by the same legal framework as traditional hotel operators. Buildings with no fossil-fuel equipment and no enclosed parking are not subject to the requirement.

Hotel owners and short-term rental operators in Massachusetts bear the legal obligation under M.G.L. c. 148, § 26F½ to equip their buildings with working, approved CO alarms and to maintain those alarms in operable condition throughout each rental period. The statute specifically requires that a landlord or superintendent install alarms that are operational at the beginning of any rental period by lease or otherwise and maintain and replace batteries or battery-operated components as needed.

For an existing hotel not undertaking code-triggering work, compliance means approved alarms on every level including finished basements and cellars but excluding uninhabitable crawl spaces and attics, placed no more than ten feet from each bedroom door, at a minimum 85 dBA at ten feet with doors closed. That is the fire code rule, and Section 915.1 of the state building code sends existing buildings to it by name. Once the building code is in play, through new construction or permitted work, the placement standard changes to Section 915.2.2 and the detection belongs inside the guest room. Plan a refurbishment on the second rule rather than the first.

Large hotels or other multi-unit buildings where individual guestrooms contain minimal or no CO sources may qualify for a technical compliance option under 527 CMR 1.00 Chapter 13. This option permits the owner to install hard-wired or low-voltage CO alarm protection targeting only the areas or rooms that contain centralized fossil-fuel burning equipment, such as boiler rooms, hot water heater rooms, and central laundry areas, plus all adjacent spaces and enclosed parking areas, provided the system is monitored in accordance with NFPA 720 requirements. This alternative does not eliminate the requirement to protect guests; it redirects protection to where the CO hazard originates within the building.

Massachusetts answers this question in two places and the building code says which one applies to your property. Section 915.1 of the state building code reads that carbon monoxide detection "shall be installed in new buildings in accordance with Sections 915.1 through 915.7" and "in existing buildings in accordance with 527 CMR 1.00: 13.7". So an existing hotel that is not doing code-triggering work is on the fire code, and new construction and code-triggering work are on Section 915.

Existing buildings, 527 CMR 1.00 § 13.7.6. Alarms no more than ten feet, measured in any direction, from any bedroom door, on every level including finished basements and cellars. Approved and listed devices, minimum 85 dBA at ten feet with all intervening doors closed.

New construction and code-triggering work, Section 915. Massachusetts amended § 915.1.1 by deleting the model's occupancy list: the state text reads only "Carbon monoxide detection shall be provided where any of the conditions in Sections 915.1.2 through 915.1.6 exist", where the national text limits itself to Group I-1, I-2, I-4 and R occupancies and Group E classrooms. That amendment makes Massachusetts broader than the model, not narrower, and it removes the occupancy argument entirely. Placement then runs through § 915.2.2: "carbon monoxide detection shall be installed in sleeping units", with the outside-the-sleeping-area option available only where the guest room and its attached bathroom contain no fuel-burning appliance and no forced-air furnace serves them.

The practical difference. The ten-foot-from-the-bedroom-door rule is written around a dwelling unit and can be satisfied from a corridor. Section 915.2.2 is written around a sleeping unit and normally cannot. A hotel refurbishing a wing under permit moves from the first rule to the second, and a guest room with a gas fireplace ends up with a detector in it either way.

Approved power configurations include: battery-operated alarms compliant with NFPA 720 § 5.2.3; AC plug-in alarms with battery backup per NFPA 720 § 5.2.2.6; and AC primary power with battery backup. For large-building centralized systems, hard-wired or low-voltage wiring with monitoring is required, and the system must meet signal transmission requirements under NFPA 720. Combination smoke and CO alarms are permitted. The current fire prevention code references device standards consistent with UL 2075 for centralized Type A systems, with installation per manufacturer's instructions and NFPA 720.

Enforcement of M.G.L. c. 148, § 26F½ is assigned to the head of the local fire department pursuant to subsection (e) of the statute. Local fire department heads have authority to conduct inspections and issue orders requiring compliance. The statute also requires that every dwelling, building, or structure occupied for residential purposes be inspected by the fire department head upon sale or transfer of the property for compliance with Nicole's Law. Complaints from guests, tenants, or local officials can trigger inspections outside of sale/transfer events. Separately, the Massachusetts Department of Public Health has authority under § 26F½(f) to incorporate CO alarm requirements into the State Sanitary Code, adding a second enforcement pathway through local Boards of Health.

Violations of M.G.L. c. 148 are subject to general fire prevention penalties under M.G.L. c. 148, § 30, which authorizes a fine of not less than $50 nor more than $500 for each day of non-compliance following notice by the fire department. Additionally, M.G.L. c. 148, § 27A imposes specific penalties for unlawfully shutting off, disconnecting, obstructing, removing, or destroying a carbon monoxide detection system without a written permit: a fine of not less than $500 nor more than $2,500 per violation. Both penalty authorities are enforced through the local fire department and the State Fire Marshal.