I built this summer house about 7 years ago - it was built around the small round window that I had made on a carpentry course. Most of the timber was reclaimed from a factory with the door and leaded windows coming from skips.It has electricity , insulation and cladding - apparently quite cosy in winter according to the two lodgers that have stayed in it.
Used for occasional sleep-overs and gin and tonics on the verandah on warm summer's evenings!