The main building stays true; it's the attached side room that has cement block half walls that has the door that has the problem every winter. Actually, after I thought about it ... it is the cement slab outside the door that heaves. I think they poured that themselves and had the building and...
Setting the cement blocks on the ground wouldn't stay straight and stable in my climate on my sandy/mixed soil because of frost heave. But with a small enough coop, it might not be too hard to redo it in the spring. The bigger issue is doors often don't open or else don't shut through the...