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Carbon Monoxide Alarms:
Office of the State Fire Marshal - Engineering Division
1202 Mail Service Center

Raleigh, NC 27699-1202
919.661.5880​

Carbon Monoxide Alarms in One-and-Two-Family Dwellings and Townhouses
Code: 2009 NC Residential Code   Amendment Date: April 1, 2011 
Section: R313
The North Carolina Building Code Council approved an amendment to the 2009 NC Residential Code that revises Section R313 to require the installation of carbon monoxide alarms in new and existing one-and-two-family dwellings and townhouses. The amendment has an effective date of January 1, 2011 and reads as follows:
R313.1.1 Carbon monoxide alarms. In new construction, dwelling units shall be provided with an approved carbon monoxide alarm installed outside of each separate sleeping area in the immediate vicinity of the bedroom(s) as directed by the alarm manufacturer.
R313.1.2 Where required-existing dwellings. In existing dwellings, where interior alterations, repairs, fuel-fired appliance replacements, or additions requiring a permit occurs, or where one or more sleeping rooms are added or created, carbon monoxide alarms shall be provided in accordance with Section 313.1.1.
R313.1.3 Alarm requirements. The required carbon monoxide alarms shall be audible in all bedrooms over background noise levels with all intervening doors closed. Single station carbon monoxide alarms shall be listed as complying with UL 2034 and shall be installed in accordance with this code and the manufacturer’s installation instructions.

NC General Statute §143-138 North Carolina State Building Code.
NC General Statute § 42-42 to 42-44
Landlord and Tenant Articles: Residential Rental Agreements
Authorizes adoption of provisions requiring the installation of either battery-operated or electrical carbon monoxide detectors in every dwelling unit having a fossil-fuel burning heater or appliance, fireplace, or an attached garage.Requires landlords to provide one operable carbon monoxide detector per rental unit per level. A landlord that installs one carbon monoxide detector per rental unit per level shall be deemed to be in compliance with standards under this subdivision covering the location and number of detectors. The landlord shall replace or repair the carbon monoxide detectors within 15 days of receipt of notification if the landlord is notified of needed replacement or repairs in writing by the tenant. The landlord shall ensure that a carbon monoxide detector is operable and in good repair at the beginning of each tenancy. Unless the landlord and the tenant have a written agreement to the contrary, the landlord shall place new batteries in a battery-operated carbon monoxide detector at the beginning of a tenancy, and the tenant shall replace the batteries as needed during the tenancy. Failure of the tenant to replace the batteries as needed shall not be considered as negligence on the part of the tenant or the landlord. This subdivision applies only to dwelling units having a fossil-fuel burning heater or appliance, fireplace, or an attached garage. Provides for penalties.

The North Carolina Residential Building Code now requires carbon monoxide alarms to be installed in one- and two-family dwellings.

  • In new construction, dwelling units shall be provided with an approved carbon monoxide alarm installed outside of each separate sleeping area in the immediate vicinity of the bedroom(s). (R313.1.1)

  • In existing dwellings, where interior alterations, repairs, fuel-fired appliance replacements or work requiring a permit occurs, or where one or more sleeping rooms are added or created, carbon monoxide alarms shall be provided in accordance with Section 313.1.1.

  • The requires carbon monoxide alarms shall be clearly audible in all bedrooms over background noise levels with all intervening doors closed. Single station carbon monoxide alarms shall be listed as complying with UL 2034 and shall be installed in accordance with the this code and the manufacturer's installation instructions.