would have to agree that a shed is the cheapest option especially given the prices of sheds these days no ideas how they make them so cheap?? i am just pricing up my new hen house which will be 4.2mX2.4 and tall enough for me to stand up in with 6 nest boxes fixed to the side, the timber will be costing me around £600 for 2x2 frame and 19mm shiplap cladding. Unless you are after a thing of beauty i would go for a bog standerd shed!!