I inherited some 100 year old windows from a local property which was part of the 'garden village movement' of the early 1900s. I designed and built my shed around the windows, broadly in the style of local out-buildings which are a feature of the local garden village in Rhiwbina, Cardiff which is about 100m away (as the crow flies). It has two bird boxes on the gable end (one for blue tits, the other for sparrows)
Built on three courses of grade 2 engineering bricks on a concrete slab with a dpm. The frame is 4x2 timber, clad with 6x1 tanalised sawn timber, topped with a light weight corrugated bitumen based roof. The shed is painted with 'garden shades' black which makes it melt into the background (as my wife promised it would, but I didn't believe her!).