The Mabou Lighthouse is a Recognized Federal Heritage Building because of its historical associations, and its architectural and environmental values.
The Department of Marine announced the completion of a set of range lights to mark the entrance to Mabou Harbour in 1884. Mabou tower was originally one of two lighthouses erected by the Canadian government as range lights to safely guide fishing boats and coastal steamers transporting goods into Mabou Harbour, the only protected harbour on the western side of Cape Breton.