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The boys have been living in a converted rabbit run since they were two months old, but - although it was useful when locked down over H1N5 - it's really too small now, so I am planning on converting my old tree house into a hen house. But I'm not sure how to fence it/contain it; my budget is about £300 for this, so I was thinking of digging shallow trenches and putting heras fencing panels into them, then a layer of cement so it is solid, with heavy duty pond mesh attached to the top of the panels and over the roof of the tree/bird house. Does this sound feasible and realistic - and most importantly safe for the birds? A proper aviary would be amazing, but I don't have the DIY skills or finances for one, and wouldn't want to buy anything wooden second hand and risk bringing any diseases in.