My mother was a lady GP and a modest extension to our house in the south of England served as her practice. This meant she could combine her medical work with being a stay-at-home mother while my father (who was an orthopaedic surgeon) was at the hospital.
The extension was tacked on to the front of our home and was single storey only, with a flat roof. It was comprised of two rooms – my mother’s consulting room and a rather larger one, which acted as the reception and waiting area. This was during the late 60s, I should add.