Check the back of your smoke detectors to find the manufacturer stamped date. Use this date in accordance with the manufacturer’s manual to calculate the expiration date. Replace old smoke detectors to ensure the safety of your family, pets, and home. Also, when remodeling, make sure you know the current local building codes. Most villages require smoke detectors in every bedroom and a carbon monoxide detector on each floor level and may require that your smoke detectors be upgrade when remodeling. Some villages even require a sprinkler head over the furnace and water heater area.