Ohai is a suburb which lies within the Territorial Authority of Southland, one of 43 residential suburbs which form the wider region. Ohai is the 15th largest suburb of Southland in terms of the total number of residential housing stock. Ohai provides a range of housing stock, with the earliest residential housing recorded in the area constructed between 1910 - 1919. The majority of the residential housing stock in the locality was constructed between 1920 - 1929. Residential housing stock in Ohai is made up of approximately 94% residential housing and 5% lifestyle properties.