# Public Safety (GPS)

## Title 12. Building and Material Codes; Other Safety Provisions

### Subtitle 11. Carbon Monoxide Alarms

#### Section 12-1104

(a) Except as provided in subsections (b) and (c) of this section, there must be a carbon monoxide alarm installed in a central location outside of each sleeping area within a dwelling subject to this subtitle.

(b) For a hotel or a lodging or rooming house, on or after April 1, 2017, there must be a carbon monoxide alarm installed within the dwelling, as follows:

  (1) on the wall inside each guest room that:

    (i) contains a device that emits carbon monoxide;

    (ii) is adjacent to a room or area that contains a device that emits carbon monoxide;

    (iii) is adjacent to an enclosed unventilated attached garage; or

    (iv) is connected by ductwork to an enclosed unventilated attached garage or room or area that contains a device that emits carbon monoxide; and

  (2) on a wall in each room or area that:

    (i) contains a device that emits carbon monoxide;

    (ii) is adjacent to a room or area that contains a device that emits carbon monoxide; or

    (iii) is adjacent to an enclosed unventilated attached garage.

(c) For a rental dwelling unit, on or after April 1, 2018, there must be a carbon monoxide alarm installed within the dwelling as follows:

  (1) outside and in the immediate vicinity of each separate sleeping area; and

  (2) on every level of the unit, including the basement.

(d) Notwithstanding subsections (a), (b), and (c) of this section, if there is a centralized alarm system that is capable of emitting a distinct and audible sound to warn all occupants, the owner of a dwelling may install a carbon monoxide alarm within 25 feet of any carbon monoxide-producing fixture and equipment.

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Md. Code Ann., Pub. Safety (as displayed at mgaleg.maryland.gov, October 16, 2026)