Playhouse to Coop

[3KillerBs]

If I remember right, it was 6X4ish and about 6 feet tall. I love the idea of keeping the windows functional, especially since it gets so hot here in the summer!

Yes, interior dimensions, not counting the porch will be important (though a porch over the pop door is a good thing that more coops should have).

Even better, if you have some available lumber, make a monitor roof. I don't have a link to show you, but @3KillerBs does.

My Little Monitor Coop article shows how to frame a monitor roof. It's a great way to get draft-free ventilation up at the top where it's needed most.