They already have a screened in porch. Why would anyone want to add a birdcage to a patio? I have seen screened in/enclosed porches on the side of patio villas on end lots but I have never seen a birdcage at a patio villa home. I have seen a few with awnings over the patio doors. That picture gives me the impression that the house lot is at an angle. If that is true then that is probably why it starts out narrow & widens toward the back.