We advise that you check the operation of your smoke and carbon monoxide alarms regularly and change the batteries twice a year. A good way to remember is when we spring forward and fall back with time changes, change the batteries in all your detectors. The California Building Code stipulates the placement of smoke alarms on every level, inside every bedroom and in the hallway adjacent to a bedroom.   Avoid placing smoke alarms in kitchens, garages, or within 3 feet of bathroom doors to reduce the probability of false activation. Carbon monoxide alarms are required on each level of the home and outside of each bedroom.