All states have laws (statutes) that require landlords to install and maintain smoke detectors in leased residential premises (apartments, homes).

Some states such as Iowa, Maine, Massachusetts, Ohio, and Vermont require photoelectric or ionization sensors—at least in new construction. And Oregon requires smoke detectors with a HUSH mechanism that allows the alarm to be silenced or temporarily desensitized for 7 minutes while a known condition such as cooking is causing the alarm to activate.

Most states also require landlords to install and maintain carbon monoxide detectors in leased residential premises. Smoke and carbon monoxide detectors are widely available in the same device.

In Vermont, landlords are required by law to install and maintain smoke detectors in all leased residential premises. Vermont's regulations specify that smoke detectors must be installed in accordance with the manufacturer's instructions and must be located on each floor of the premises, outside sleeping areas, and inside each bedroom. The state mandates the use of photoelectric or ionization sensors in smoke detectors, particularly in new constructions, to ensure the early detection of fires. Additionally, Vermont law requires the installation and maintenance of carbon monoxide detectors in rental units that have a fuel-burning appliance, have an attached garage, or are otherwise at risk for carbon monoxide exposure. These detectors must also be installed according to the manufacturer's instructions and in locations that will effectively alert residents to the presence of carbon monoxide. It is the responsibility of the landlord to ensure that these safety devices are in working order at the beginning of a tenancy, and typically, the maintenance responsibility during the tenancy may be outlined in the lease agreement.