My husband and I are just starting our new build. We have a fixed price contract. There are already several areas where we know we're going to go over budget (i.e. upgrading fireplaces, etc.). My question is, should we be receiving some type of invoice/receipt for these overages? As of now, he's just giving us a number (i.e. "to upgrade to the fireplace you want, it's an extra $3000"). I guess we're just kind of confused about how this should work. This process is starting to make us feel like we're at the mercy of our builder. We think he's a trustworthy guy, but don't want to be taken for a ride. Can someone explain to us exactly how this process should work. What type of invoices should we be receiving, if any?