Once you give the builder your spec book, your job is basically done in regards to the materials. It is the builders responsibility to make sure that the vendor’s order matches what is on the finish schedule. Also, it is the vendors responsibility to give all information to the builder in regards to delivery. If they need a reselection they will let you know. Given the regularity of things being out of stock, I would have it in your contract that reselections are charged by the hour.
Hope that helps!
