New Hampshire CO Detector Requirements for Hotels and Short-Term Rentals

New Hampshire RSA § 153:10-a requires carbon monoxide detectors in all rental units, and the statute explicitly defines "rental unit" to include hotels, motels, dormitories, apartments, and single-family dwellings rented on either a permanent or transient basis. This broad definition means that hotel operators and short-term rental hosts operating any form of lodging for rent are subject to the same statewide CO detector mandate. Under para. I, single-family dwellings built or substantially rehabilitated after January 1, 2010 must comply; under para. II, all rental units as defined are covered regardless of construction date. Under RSA § 153:10-a, para. II-a, the owner of the rental unit is responsible for maintaining CO detectors in suitable condition. The New Hampshire Division of Fire Safety enforces the law statewide, with authority to delegate enforcement to local fire authorities. Violations carry fire code penalties under RSA § 153:24. Local ordinances with stricter requirements remain valid and are not preempted.

RSA § 153:10-a applies to all rental units, a term the statute defines as "any residential unit in a building or single family dwelling which provides permanent or transient living facilities for one or more persons, which is occupied by tenants on a rental basis." The statute expressly lists hotels, motels, dormitories, apartments, duplex units, rooms rented from another's home, and single-family dwellings rented to others as covered property types. This inclusive definition brings all short-term rental listings, including Airbnb and VRBO, under the same mandate as commercial hotels and motels, without a minimum room count threshold or property type carve-out. Single-family dwellings built or substantially rehabilitated after January 1, 2010 are covered under para. I, which includes an exemption for dwellings with no attached garage and no combustion-fuel appliance. All other rental units, including hotels, motels, and commercial STRs, are covered under para. II without that same explicit exemption.

Under RSA § 153:10-a, para. II-a, the owner of a rental unit is legally responsible for maintaining all CO detectors in suitable condition. For hotel and STR operators, this encompasses installation, ongoing maintenance, testing, and timely replacement.

Installation: CO detectors must be installed in covered units, and RSA § 153:10-a, para. I sets the standard by naming one: detection devices "in accordance with the NFPA 720 Standard for the Installation of Carbon Monoxide (CO) Detection and Warning Equipment". The statute itself sets no placement rule, and the words "sleeping", "bedroom" and "vicinity" appear nowhere in it. Where a summary of New Hampshire law offers a sleeping-area placement rule, ask which document it came from.

Power source: In buildings served by commercial electrical power, CO detectors must receive their primary power from building wiring with battery backup; battery-only units are permitted only where commercial power is not available. For new construction with two or more alarms in the same unit, alarms must be interconnected.

Maintenance: The owner must ensure detectors remain in suitable working condition throughout the rental period. No person, including guests, may remove the battery from, disconnect power to, or otherwise tamper with or disable a CO detector.

Trigger: para. I carries its own exemption and it is written for the covered units themselves. A detection device is not required in a multi-unit dwelling or rental unit "that does not have an attached garage and does not contain an appliance or device that uses a combustion method of burning solid, liquid, or gas fuel", and the exemption lapses the moment a garage or a combustion appliance is added. Para. II repeats the same two-part exemption for a single family dwelling built or substantially rehabilitated after 1 January 2010. Note what the exemption turns on: the unit, not the building. A guest room with no garage and nothing burning inside it is outside para. I on the statute's words, whatever sits in the plant room downstairs, which is a narrower reach than the model codes give and is worth checking against the standard the section incorporates.

Recordkeeping: The statute does not require a written maintenance log, but operators should document inspections to demonstrate compliance during fire safety reviews.

The statute does not set the technical requirements itself, and it does not leave them to guidance either. RSA § 153:10-a, para. I names a standard: every multi-unit dwelling and rental unit "shall be equipped with automatic fire warning devices in accordance with the NFPA 101 Life Safety Code and the NFPA 72 National Fire Alarm and Signaling Code and carbon monoxide detection devices in accordance with the NFPA 720 Standard for the Installation of Carbon Monoxide (CO) Detection and Warning Equipment". So the placement question in New Hampshire is an NFPA 720 question, and the state fire marshal's power under para. III is to make rules enforcing paragraphs I, II and II-a rather than to write the placement standard.

Two things follow that an operator should know before relying on any summary of this section.

The statute itself contains no placement language. Measured across the whole of RSA § 153:10-a: "carbon monoxide" occurs 19 times, and "sleeping" zero, "bedroom" zero and "vicinity" zero. Anyone quoting a sleeping-area rule for New Hampshire is quoting it from somewhere other than the statute.

NFPA 720 no longer exists as a separate standard. It was withdrawn and its content folded into NFPA 72. The statutory reference has not been updated, so a property asking which document governs should put that question to the state fire marshal or the local enforcement authority rather than assume the successor text applies automatically.

Power source: Where commercial power is available, CO detectors must be hardwired to building wiring with battery backup. Battery-only operation is permitted in buildings without commercial power. New construction with multiple alarms in a single unit requires interconnection.

Anti-tampering: No person may remove the battery from, disconnect primary power to, or tamper with a CO detector. Tenants and guests are prohibited from disabling required alarms.

Device standard: whatever NFPA 720 requires, since that is the standard para. I incorporates, together with the manufacturer's published instructions. New Hampshire's statute names no listing standard of its own and no International Code, so a claim that the International Residential Code governs a New Hampshire hotel needs a source in the statute, and there is none.

The NH Division of Fire Safety (state fire marshal) is the primary enforcement authority for RSA § 153:10-a. Under para. III, the state fire marshal may enforce the statute directly or appoint a municipal authority to do so. Under para. V, the state fire marshal may authorize local fire departments to issue citations for CO detector violations; citations carry the penalties set forth in RSA § 153:24. Guests or neighbors who observe non-compliance may report concerns to the local fire department or directly to the NH Division of Fire Safety. For lodging establishments, fire safety inspections are the primary compliance checkpoint. RSA § 153:10-a, para. VI explicitly confirms that local ordinances containing stricter requirements than the state law remain valid and enforceable alongside the state standard.

Under RSA § 153:24, violations of fire marshal rules issued under RSA Chapter 153 carry the following penalties: a natural person is guilty of a violation (a non-criminal infraction under NH law carrying fines); any other person, including a business entity operating a hotel or STR, is guilty of a misdemeanor. Each separate offense constitutes a separate violation. Citations may be issued by local fire authorities granted authority by the state fire marshal under RSA § 153:10-a, para. V. Penalties collected under Chapter 153 are paid to the state treasury.