Massive expansion to the United Methodist Church of New Lenox was programmed in four stages. The first stage was to erect a new addition to the existing sanctuary while keeping the existing sanctuary in operation as long as possible. Secondly, we constructed a new main entry to the west side of the existing church. Third, we created a new two-story kitchen link addition to the east side to serve as a connecting link to a future Family Life/Multipurpose Center. Finally, we demolished and renovated the interior spaces to blend all of the new additions with the existing building. All of this very difficult work was accomplished while keeping the facility in operation throughout. The most critical aspect was the sanctuary expansion where we built the new roof structure and walls over and around the existing sanctuary and then demolished the entire altar wall from the inside. The expansion perfectly matched the existing, both inside and out.