Parallel villa is a summer house, located in Nava, Amol. Which overlooks the nature around. One of the significant properties of this project is steep slope which led to height difference. The design inspired by the site topography and the employer′s demand about dwelling and using two generations of a family. Also due to locating the site in the vicinity of a river, we had to consider river zone in our design. According to the needs of employer in using occupancy area, permissible density, considering the river zone and applied leveling in the past, stair retreat in volumes was exerted.