When it comes to deciding on how you are going to proceed, there are a couple of directions to go with a home addition: up or out. What are the advantages of an 2nd level addition versus a ground level addition? This is often dictated by the purpose of the project — kitchen additions invariably go out, for example — but it’s not always that cut and dry. There’s sometimes more than one way to design a project, so consider the advantages and disadvantages of which direction you build.