An alarm extension system that takes an interior alarm condition and extends it to the exterior of a structure. In various embodiments, the present invention is a system and method that links to an existing alarm (smoke detector, burglar alarm, etc.) and activates a flashing mode in one or more exterior lights or an exterior siren. Thus, during an alarm condition within the house or other structure, a neighbor or anyone passing by can become aware of the alarm condition. This method of signaling thus alerts many in the surrounding area of a situation within the building that may require emergency assistance.