Abstract: A headwall unit mountable to at least one wall support member, the at least one wall support member having a wall supporting surface for receiving wall material. The headwall unit includes a frame comprising a back plate mountable to the at least one wall support member so as to overlie the wall supporting surface, the back plate having at least one back port for receiving a medical service carrier through the back plate; and a faceplate attachable to the frame such that the faceplate is spaced apart from the back plate and defines a space therebetween for receiving a fixture, the fixture being connectable to the medical service carrier for supplying a medical service.