For the most part, this oftentimes comes down to the details of what is actually being quoted, commonly known as the scope of work. There are numerous ways that all home improvement projects can be done, along with a variety of materials that can be used. If a roof, for example, is done without complete underlayment and entry level materials, it’s going to cost less than a complete integrated roof system with better quality materials. A contractor without proper insurance coverage can also work for less than one who has complete coverage. It’s important to look at what each contractor is offering in terms of the best protection for you, as well as the actual scope of work. It’s easy to see some similar words or phrases on estimates and assume they are the same, as home improvements aren’t every day purchases and can be confusing. However, it’s important to compare closely and ask lots of questions to clear up any confusion. Typically, home improvements are much like everything else, in that you get what you pay for.