Yes I feared it would be too small for them but for just three, it's good. We have a lot of foxes in London and they are quite big and bold, so we put a metal grille gate over the front of our side return to make the coop and it is fully protective.
and keep 3 lovely pekin bantams in my back yard side return, loving it!
Was surprised to find they stopped laying mid Oct, but realised now it's normal. They're still happy!