The high school building was expanded and modernized from 1996 to 1999. Renovations took a long time and created many issues, one being that one side of the school is higher than the other. The most significant physical addition to the school during these years was the demolition of a small building at the rear center of the (used as counselling suite and lounge area) and the construction of a three-floor addition to house new and spacious science classrooms/laboratories, as well as large seminar classrooms. With this change, rear classrooms in the center of the original building lost exterior windows, and now looked out over open common space adjacent to two new cafeterias, separated by a large new kitchen. Further this new addition included new administrative offices. This meant that these offices left their original locations along the front of the center wing of the original building. This space became a new principal's office, infirmary, sewing classroom, and a new staircase was added, as well. With the construction of the additions, the wood, metal, and motor shops were eliminated from the building, along with those courses. Wood shop continued to be offered to at the Haverford Middle School wood shop.