We have bought a house which, while very lovely, is non-extendable! It has a side return extension already and a small utility room at the back and the garden is otherwise too sloped to build into, although it does have terraced levels. The ceilings upstairs mean we can't do a loft conversion. As it stands, we have enough room but it would be useful to have a back up plan, and I wondered if anyone has ever done one of those ready made insulated garden rooms? I thought it would be useful for a teenager's room in the future. They look quite reasonably priced for the space you get but are they too good to be true?