I bought a 6 x 4 garden shed from Focus DIY, put in some dowels across the corners for perches, a shelf along one side, a pop hole in the door, an old drawer on the floor for nesting, vinyl on the floor bigger than the shed, straw to absorb mess. Clean it out once a week, hose down the vinyl, fresh straw in. Housed 12 birds at one point with room to spare although I have less now. Easy to clean, can stand upright in it, cost about £125 delivered. Took me and my son a couple of hours to set up.