Alabama          

CO alarms are required outside of each separate sleeping area in the immediate vicinity of the bedrooms in all newly constructed one and two-family dwellings and town homes not more than three stories.

Effective date: October 2012

Alaska          

CO alarms are required in all residential structures with fossil fuel heating appliances, attached garages or enclosed parking.

Effective date: January 2005

Arizona               

CO alarms are required outside of each separate sleeping area in the immediate vicinity of the bedrooms in all newly constructed one and two-family dwellings and town homes not more than three stories

Effective date: January 2013

Arkansas          

Code requires CO alarms on each floor of newly constructed one- and two-family dwellings.

Effective date: January 2012

California               

CO alarms are required in all single- and multi-family dwellings in California.

Effective date: January 2011 (new one and two-family dwellings and town homes not more than three stories; July 2011 (all existing single-family homes); January 2013 (all existing dwellings)

Colorado          

CO alarms are required in new and existing single- and multi-family dwellings.

Effective date: July 2009

Denver: 

Upon expiration of currently installed battery-operated CO alarms, alarms shall be replaced with CO alarms featuring 10-year lithium batteries. Combination smoke/CO alarms are exempted from this requirement.

Effective date: 2017

Connecticut          

CO alarms are required in all new one- and two-family homes and in all homes offered for sale and built prior to October 2005.

Effective date: October 2005 (for new construction); July 2014 (for real estate transfers)

Delaware          

CO alarms are required outside of each separate sleeping area in the immediate vicinity of the bedrooms in all newly constructed one and two-family dwellings and town homes not more than three stories.

Effective date: January 2017

Chapter Number 349 requires the installation of hardwired, interconnected CO alarms in each sleeping area and in any room with a CO source or adjacent to an attached garage. Compliance with this requirement will be phased in, with new properties having to comply immediately (July 2018). Properties currently under construction would have until December 31, 2019, to comply, while existing properties must comply by December 31, 2020.

Wilmington:

CO alarms are required in all residential dwellings and mixed-use occupancies.

Florida               

CO alarms are required in the new construction of every building that includes a fossil-fuel-burning heater or appliance, fireplace, or an attached garage.

Effective date: July 2008

Georgia               

CO alarms are required outside of each separate sleeping area in the immediate vicinity of the bedrooms in all newly constructed one and two-family dwellings and town homes not more than three stories.

Effective date: January 2009

Idaho          

CO alarms are required outside of each separate sleeping area in the immediate vicinity of the bedrooms in all newly constructed one and two-family dwellings and town homes not more than three stories.

Effective date: January 2011

Illinois               

All existing and newly constructed residential dwellings must have CO alarms within 15 feet of sleeping areas.

Effective: January 2007

Indiana               

Carbon monoxide alarms are required in newly built one- and two-family homes and townhomes. CO alarms also are required in cases where alterations, repairs or replacement of electrical systems require permits. 

Indianapolis-Marion County:

CO alarms are required outside of each separate sleeping area in the immediate vicinity of the bedrooms in all newly constructed one and two-family dwellings and town homes not more than three stories.

Effective date: January 2017

LaPorte:

CO alarms are required in new residential construction.

Effective date: May 2017

Iowa          

CO alarms are required in all newly constructed one and two-family dwellings and town homes not more than three stories.

Effective date: January 2010

CO alarms are required in all newly constructed and existing multi-unit dwellings and single-family rental properties.

Effective date: July 1, 2018

Kentucky               

CO alarms are required in newly constructed one- and two-family dwellings, townhomes less than 3 stories, apartment buildings, dormitories, adult/child care facilities and assisted living facilities which contain a fuel-burning-appliance or an attached garage.

Effective date: June 2011

Louisiana               

CO alarms are required in all newly constructed one and two-family dwellings and town homes not more than three stories.

Effective date: January 2011

Maine               

CO alarms are required in all newly constructed one and two-family dwellings, town homes not more than three stories and multi-family dwellings. CO alarms are also required in all existing multi-family dwellings, existing single-family dwellings upon sale only, and all rental dwellings.

Effective: September 2009

Maryland               

CO alarms are required in new single- and multi-family dwellings, hotels, motels and dormitories.

Effective date: January 2008

Massachusetts                         

CO alarms are required in single- and multi-family dwellings, boarding houses, hotels, motels, dorms, apartments, adult and child care facilities. Combination devices with two or more technologies that are incorporated into one unit shall have simulated voice and tone alarm features which clearly distinguishes between two or more events such as carbon monoxide and smoke.

Effective date: March 2006

Michigan          

CO alarms are required in all newly constructed one and two-family dwellings and town homes not more than three stories, and existing multi-dwelling units.

Effective date: January 2010

Minnesota          

CO alarms are required in all dwelling types:

Newly constructed single family homes and multi-family dwelling units (effective January 2007)

Existing single-family homes (effective August 2008)

Existing multi-family dwellings (effective August 2009)

Mississippi          

CO alarms are required in newly constructed one and two-family dwellings and town homes not more than three stories.

Effective: January 2013

Missouri          

Missouri has no statewide requirements for CO alarms.

City of St. Louis:

CO alarms are required in new and existing residential structures.

Effective: January 2006

Montana          

CO alarms are required in newly constructed one and two-family dwellings and town homes not more than three stories.

CO alarms are required in landlord-controlled properties. Disclosure of CO alarm presence or absence is also required when transferring title.

Effective date: October 2009

Nebraska          

CO alarms are required in all newly constructed one and two-family dwellings and town homes not more than three stories.

Effective date: July 2011

CO alarms are required in new multi-family dwellings, as well as existing dwellings that undergo renovation, rental properties that have a change in tenancy, and existing multi-family properties that are sold and bought.

Effective date: January 2017

Nevada          

CO alarms are required in all newly constructed one and two-family dwellings and town homes not more than three stories.

Effective: January 2017

New Hampshire          

CO alarms are required in single- and multi-family dwellings built or substantially rehabbed.

Effective date: January 2010

New Jersey          

CO alarms are required in many building types:

Single- and two-family homes at point of sale or transfer (effective June 1996)

All new residential construction (effective April 2003)

New and existing commercial buildings (effective February 2016)

New Mexico          

CO alarms are required in all newly constructed one and two-family dwellings and town homes not more than three stories.

Effective: July 2011

New York               

CO alarms are required in nearly all structures in the State of New York:

New construction of single- and two-family homes and townhomes (effective 2003)

New and existing one- and two-family dwellings and multi-family dwellings, hotels, dormitories etc. (effective February 2010)

North Carolina               

CO alarms are required in all newly constructed one and two-family dwellings and town homes not more than three stories and all rental properties.

Effective date: January 2010

North Dakota          

CO alarms are required in newly constructed one and two-family dwellings and town homes not more than three stories.

Effective date: January 2011

Ohio                         

CO alarms are required in newly constructed one and two-family dwellings and town homes not more than three stories.

Effective date: January 2013

CO alarms are required in existing multi-dwelling properties (hotels, motels, care facilities, multi-family housing, etc.)

Effective date: January 2019

Cleveland:

CO alarms are required in all rental dwelling units

Effective date: January 2017

Oklahoma          

CO alarms are required in newly constructed one and two-family dwellings and town homes not more than three stories.

Effective date: January 2011

Oregon               

CO alarms are required in newly constructed single and multi-family dwellings and existing single and multi-family dwellings when sold or transferred.

Effective date: April 2011

CO alarms are required in all rental properties.

Effective date: July 2010

Pennsylvania               

CO alarms are required in all newly constructed one- and two-family dwellings and town homes not more than three stories.

Effective date: January 2010

Pennsylvania homeowners, upon the sale of their home, are required to disclose to the buyer if the structure is equipped with a CO alarm in the vicinity of each bedroom and the fossil-fuel appliance or heater. The law also requires owners of multi-family dwellings to install CO alarms in the vicinity of bedrooms and the fossil fuel appliance or heater.

Effective date: June 2015

Philadelphia:

CO alarms are required in all new and existing one- and two-family homes.

Effective: January 2009

Rhode Island          

CO alarms are required all one-, two-, and three-family dwellings; hotels; dormitories; apartment buildings; and daycares.

Effective date: January 2002

CO alarms are required in all schools (Senate Bill 2179) 

Effective date: January 2019

South Carolina          

CO alarms are required in all newly constructed dwelling units and occupancies.

Effective date: July 2013

South Dakota          

CO alarms are required in newly constructed one and two-family dwellings and town homes not more than three stories.

Effective date: January 2012

Tennessee          

CO alarms are required in newly constructed one- and two-family dwellings, townhouses, R-2, R-3 and R-4 occupancies.

Effective date: June 2011

Texas               

In jurisdictions that adopt state model codes, CO alarms are required in newly constructed or substantially remodeled one- and two-family dwellings; townhomes lower than three stories; and commercial buildings, inclusive of apartment and condo buildings.

Effective date: January 2022

Utah          

CO alarms are required in all newly constructed one-and two-family dwellings and town homes not more than three stories.

Effective date: November 2006

CO alarms are widely required in all new and existing dwellings.

Effective date: January 2011

Vermont                    

CO alarms are required in all newly constructed one- and two-family dwellings and town homes not more than three stories. CO alarms are also required upon initial occupancy or real estate transfer.

Effective date: July 2005

Virginia          

CO alarms are required in newly constructed one and two-family dwellings and town homes not more than three stories.

Effective date: January 2011

Washington          

CO alarms are required in all dwelling types:

Newly constructed one- and two-family dwellings and town homes not more than three stories (effective January 2011)

Owner-occupied single-family homes upon sale or transfer (effective July 2011)

Existing R-1, R-2 and R-3 occupancies (effective January 2013)

Wisconsin               

CO alarms are required in all dwelling types:

New multi-family dwellings (effective October 2008)

Existing multi-family dwellings (effective April 2010)

New and existing one- and two-family dwellings (February 2011)

West Virginia          

CO alarms are required in all newly constructed one- and two-family dwellings and town homes not more than three stories.

Effective date: July 1998

CO alarms are required in existing apartments, hotels and other group occupancies, as well as in rented one- and two-family dwellings.

Effective date: September 2012

CO alarms are required in all new multi-dwelling units, hotels and other group occupancies.

Effective date: January 2013

CO alarms are required in all public and private schools within the state, as well as daycare centers (House Bill 4138). Alarms must be hardwired with battery backup 

Effective date: January 2019

Wyoming          

CO alarms are required in newly constructed one and two-family dwellings and town homes not more than three stories.

Effective date: January 2011

DISCLAIMER: The information provided herein is BRK Brands, Inc.'s summary interpretation. It is only intended to be used as general reference material. It is neither authoritative nor intended to take the place of either the written law or applicable regulations. This should not be construed as an attempt to offer or render legal advice, a legal opinion, or otherwise engage in the practice of law. Check with your state and local authorities for complete information.