Carbon Monoxide

The Minnesota State Fire Marshal recommends that smoke and CO detectors be replaced when they have been in use for more than 10 years or when the alarm fails to respond to testing. Other conditions also may cause an alarm to be less effective. For questions or concerns relating to smoke or CO detection, contact the Inspections Division by email or by calling 651-714-3543.

Carbon Monoxide Detector Requirements

  • IRC 2015 - Minnesota Amendments Section R315

R315.3 Where Required in Existing Dwellings

Where work requiring a permit occurs in existing dwellings that have attached garages or in existing dwellings within which fuel-fired appliances exist, carbon monoxide alarms shall be provided in accordance with Section R315.1.

R315.1.1 Installation

Carbon monoxide alarms shall be installed outside and not more than 10 feet (3048 millimeters) from each separate sleeping area or bedroom. Alarms shall be installed on each level containing sleeping areas or bedrooms.

Smoke Detectors

Remember, Carbon Monoxide Detectors are not Smoke Detectors. For more information related to residential smoke alarm requirements, visit the Installing and Maintaining Smoke Alarms page of the National Fire Protection Association website.