1) A work order can be a binding contract. All a contract is, is an agreement between two parties, where the terms are known to both sides and they show their agreement to those terms. A work order can do that.2) You have a right to commercially acceptable quality (basically, what a reasonable contractor would be expected to do, or what the average reasonable person would find acceptable). That is not necessarily the same thing as saying that *you* have the right to be satisfied, since if you have higher-than-average standards or more particular requirments than most, the contractor does not need to meet them--he only needs to do what most people would find acceptable.