Here is a pic of the basic "hot frame" box, a floor , 4 walls attached to 2x2s in each corner.
A pop door can be cut into the floor on one side..legs can be screwed on, and you can make it any size.
The back wall is taller, and the sides slanted.
We have to build these to match the size of the window, and it helps to build them as per the sheet of OSB or plywood to avoid waste, such as in 4x4 or 4x8 sizes.
P.S. There is a 1/2" sheet of styrofoam on the inside, which really helps insulate, but chickens will eat it, so if you use styrofoam you would have to cut 2 of each piece, and sandwich the styrofoam inbetween so they cannot eat it.
A pop door can be cut into the floor on one side..legs can be screwed on, and you can make it any size.
The back wall is taller, and the sides slanted.
We have to build these to match the size of the window, and it helps to build them as per the sheet of OSB or plywood to avoid waste, such as in 4x4 or 4x8 sizes.

P.S. There is a 1/2" sheet of styrofoam on the inside, which really helps insulate, but chickens will eat it, so if you use styrofoam you would have to cut 2 of each piece, and sandwich the styrofoam inbetween so they cannot eat it.
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