The building code in our community requires a smoke detector in each bedroom and a smoke detector in the hall outside of the bedrooms. No kitchen smoke detector required.(probably in part because people disarm the kitchen ones because they go off all the time with ordinary cooking) however I live a few blocks from the beach, and in the summer when we have our "June gloom" foggy weather(or in the early fall) the foggy night air sometime sets off our bedroom smoke detector in the middle of the night - yikes~ tokie