Building your first home is a major undertaking. There’s a lot you have to learn, and there are many places where you can make mistakes. Unfortunately, some of these mistakes can be very costly. The last thing you want to do is to go horribly over-budget because you forgot something or made one small error. Fortunately, many of these mistakes can be avoided if you can prepare for them beforehand. Here are some of these common mistakes and how you can avoid making them.