Publisher Summary Once the project has reached the working drawing/construction document stage, the green design concepts and resulting configurations should be well set, and the task of incorporating them into the documents that contractors will use to build the project should be relatively routine. Many firms have a routine procedure to review the documents for quality before they are released to contractors, ensuring concepts are adequately depicted and described and catching errors and omissions. This process should also include a green design concept review, by one or more design team members in the early stages of the project. As in this case, the economic advantage of green engineering is often found through the “no-build” offset. Since sustainably designed buildings are often lifecycle cost over longer time horizons, engineers (and owners) must similarly shift their focus. This chapter describes the impacts on operating and maintenance costs.