Smoke alarms are generally required in residential settings. Hard-wired smoke alarms are required in all new construction in local jurisdictions that have adopted IRC standards.

San Antonio:

Single- and multi-family dwellings that are rented out by a third party must ensure all units are equipped with smoke alarms, CO alarms, and fire extinguishers. Owners must also post an emergency escape plan conspicuously within the unit.

Effective date: February 2019