A summer house is a single-storey house that only takes up a small portion of your yard, but can be used as a playroom for your kids, a home cinema, a garden shed, or even a gym. Description from pinterest.com. I searched for this on bing.com/images
HECHTEL-EKSEL, BELGIUM - Eco-friendly tree house in the town’s forests with the goal of persuading politicians and organizations to embrace sustainability. Created by German design firm Baumraum, the building is supported by 19 steel stilts and comprises two cabins—one with a technology room, pantry, and bath, the other with a meeting-and-event space.