I built the shed from scratch. It has been a long time ambition of mine to have my own workshop and here it is. It is insulated with 50mm polystyrene and clad inside with 1/2" ply. The eaxterior is feather edge board.It has everything you would expect from a workshop including power and heating. The base is made from 4" x 2" pressure treated timbers on levelling stilts.