A domestic greenhouse 100 comprises at least one side wall, a roof having at least one roof panel, and at least one end wall, and at least one door 200, 210 that in a closed position obscures a doorway opening 180 provided in one of the end walls or side walls and in an open position enables a person access through the doorway. The door comprises a sliding door that is supported by at least one support assembly comprising a telescopic guide having a fixed part and a moving part, in which one of the parts is secured to the wall of the greenhouse and the other part secured to the door to support the door in such a way that the doorway does not have a lower threshold strip. The greenhouse may have two support assemblies, a first located at the top of the at least one door and one at the bottom
