Tinley Park, IL Building Safety: Carbon Monoxide Detectors (2026)

07(E)(2)(A)(4) requires carbon monoxide alarm detectors, effective January 1, 2007, in all new buildings containing bedrooms and sleeping facilities, tracking the state's Carbon Monoxide Detector Act (Public Act 094-0741). Every dwelling unit must have at least one operable carbon monoxide alarm within 15 feet of every room used for sleeping purposes. The alarm may be combined with a smoke detecting device as long as the combined unit meets both standards and differentiates which hazard triggered it. The code defines a dwelling unit broadly to include single-family residences, multiple-family residences, and mixed-use buildings, and where a structure holds more than one dwelling unit, an alarm is required within 15 feet of every sleeping room in each unit, not just one per building.

Responsibility is split by ownership: the owner must supply and install every required alarm, and a landlord must make sure the alarms are operable on the date a lease begins. Once the lease is running, the tenant takes over testing, battery replacement, and maintenance. Landlords also carry a paperwork duty: they must furnish one tenant per dwelling unit with written information on alarm testing and maintenance. The subsection ends with its own criminal penalty rather than deferring to the general code fine: willful failure to install or maintain an alarm in operating condition is a Class B criminal misdemeanor.

Conduits running to carbon monoxide detectors must also be sealed to avoid condensation problems affecting the sensor, per the same subsection covering smoke and heat detector wiring.