Washington Valley is a suburb which lies within the Territorial Authority of Nelson, one of 30 residential suburbs which form the wider region. Washington Valley is the 8th largest suburb of Nelson in terms of the total number of residential housing stock. Washington Valley provides a range of housing stock, with the earliest residential housing recorded in the area constructed between 1880 - 1889. The majority of the residential housing stock in the locality was constructed between 1980 - 1989. Residential housing stock in Washington Valley is made up of approximately 96% residential housing and 4% residential investment housing properties.