1) Never build a house or temple starting with the roof. It doesn't work unless aliens with flying saucers come over to beam it up.
2) Carefully choose location: If you build up on shit, no matter how many coats of fresh paint you'll put on the walls, they'll still stink like shit and the foundations will always crumble and rot.
3) In case of problems — the architect is sole responsible. He designed the project.