In my opinion that's excessive but it will reduce the risk of losing birds to varmints (and gardens to birds) to almost zero.Thanks, probably should have mentioned the sides would be hinged ( both sides) to facilitate getting to the nest boxes. It will be 100% enclosed in a welded wire dog kennel. View attachment 367684 when We expand chicken world. We also may go with one of these View attachment 367686
I am fine with excessive. Lots of aerial and ground based predators where I am so going to an extreme to keep them away from my omelet makers is not a huge deal. We plan on expanding from the current 30’x10’x6’ kennel enclosure to probably double that plus the big domed enclosure so we can have both layers and chickens to eat.In my opinion that's excessive but it will reduce the risk of losing birds to varmints (and gardens to birds) to almost zero.
For housing chickens in an enclosure like that, you don't even really need a big house. Just some roof to keep the rain and wind off and smaller spaces to encourage them to lay in. You'll get more use out of the available floor space if you have them up on legs so the birds can walk and scratch under them. Something flat on the ground like that will just take up lots of floor space and the chickens won't get any use out of the top surface.
At any rate, to build something like what you pictured out of new lumber, using cedar fence pickets for most of the cladding and no critter mesh fence, materials cost would be on the order of $120. It would cost me just about as much in fuel to get it to you, so you probably don't want me making it for you.