So you will need 24 square feet in the coop -- a minimum of 4x6 feet but larger is better if your run won't be roofed so that the chickens will be literally cooped up in the winter,
60 square feet in the run -- 6x10 or 8x8,
6 feet of roost bar,
2 nest boxes,
And 6 square feet of ventilation...
How many chickens are you planning on getting?
Where, in general, are you located? Climate matters so we'll give better advice if we know what sort of weather you'd be coping with.
My Little Monitor Coop is designed to meet all the minimums for 4 hens in a warm, wet climate but if you have a...