From the outside it would look perfectly at ease alongside the Hobbit houses in The Lord Of The Rings.
But this former underground reservoir with planning permission for a home to be built into the hillside offers all the eco-benefits of an underground dwelling, with all the luxuries of modern living and breathtaking views.
With its raised position on the side of Alveston Hill, in the heart of rural South Gloucestershire, the property will offer views across the Berkeley Vale and over the River Severn towards the Forest of Dean, while still being within commuting distance of Bristol.
The land has been put up for sale in a rare opportunity to purchase the former reservoir, along with detailed planning consent, and is expected to draw interest from homeowners looking for something a little less ordinary.
The finished property is expected to be one of the most unusual in the area.
Planning permission for the single-storey property includes a lounge, kitchen, dining area, utility room, bathroom, two double bedrooms and what is being described as a hobby room/third bedroom.
Outside there is to be a green roof with patio area, an adjacent lawn area and a private driveway providing access on to Alveston Hill.
The owners will also have the option of buying an extra 12.39 acres of land to go alongside the property.
The sale is being handled by estate agent David James and Partners which is expecting a high level of demand for such an unusual project.
"This opportunity to convert a former reservoir into an eco-friendly three-bedroom property will ensure the owner is several steps ahead of current building standards," said estate agent Stewart Waters. "It will create a once-in-a-lifetime, cutting-edge 21st century home."