It all starts with the foundation, it that's not right then you're just building on top of a problem. This is a video at one of our new builds and it provided an ideal training video. Agents must understand basic construction and visit sites regularly, we make it a point to be out at least weekly. They don't do what you don't check, and there are countless examples over the years of builders cutting corners or completing shoddy work. We check and we check and we suggest inspectors at several stages of the build.
Agents have a significant responsibility when representing a client, take it seriously. In this case, it's easy to sit back and let the builder finish the home, show up for closing and collect a check and leave. Don't do that, commit to the client, check everything and bring in experts. The client is depending on you and take nothing for granted.