Trentham is a suburb which lies within the Territorial Authority of Upper Hutt, one of 27 residential suburbs which form the wider region. Trentham is the largest suburb of Upper Hutt in terms of the total number of residential housing stock. Trentham provides a range of housing stock, with the earliest residential housing recorded in the area constructed between 1900 - 1909. The majority of the residential housing stock in the locality was constructed between 1950 - 1959. Residential housing stock in Trentham is made up of approximately 96% residential housing and 4% residential investment housing properties.