I should avoid 2nd hand poultry housing if I were you, unless you're really desperate. It can be full of red mites in every nook and cranny, and if the coop has been unoccupied for a while they'll be hungry, and literally suck your hens dry.
My son had a very good show strain of pekins completely wiped out by red mite, after he thought he'd bought some bargain 2nd hand coops.
If you do buy 2nd hand, make sure you go over the whole thing with a blowlamp, and then a liberal application of creosote.
Better off to build your own, to be honest.