7" widesized for using with the 9x9x1 platform (so you'll have an inch of platform on either side to put plants, etc.).
This set includes double doors for the front and back (I'm just holding one up for size in the main photo, but there are 4).
The roof can lift off to work inside (or see inside better) -- plus there's a ledge around the top of the "room" that you could hang plants from.
Ships flat. Cut from heavy chipboard.