when building, I noticed that some objects are not placed and some scaffolding and ladders, the characters use to build the houses are not undone after the end of construction.
Make sure there’s no little…single block that hasn’t be finished. If the whole thing is done, hit Ctrl + Shift + C, click the offending scaffolding or ladder and type destroy up top in the …whatever it’s called.
Otherwise, you might need to find what piece is not built yet, pause building, then start building again.