Cass Bay is a suburb which lies within the Territorial Authority of Christchurch, one of 116 residential suburbs which form the wider region. Cass Bay is the 86th largest suburb of Christchurch in terms of the total number of residential housing stock. Cass Bay provides a range of housing stock, with the earliest residential housing recorded in the area constructed between 1940 - 1949. The majority of the residential housing stock in the locality was constructed between 1970 - 1979. Residential housing stock in Cass Bay is made up of approximately 99% residential housing and 1% lifestyle properties.