S. M. Wilson will break ground today on construction of a $21.1 million, four-story addition to Webster Groves High School.

The 106,000 square foot addition will include new classrooms, state-of-the-art science labs, vocational labs, a main band room, private band practice rooms and art studios. The expansion will be built to resemble the look of the existing historical buildings on the campus, including the use of terrazzo floors and steps, and limestone accents.

The vocational lab, which will be on both the ground floor and in the basement of the building, will be served by a freight elevator. The ceiling of the basement will feature high-tech sound and vibration controls to keep lab noise from disrupting activities on the first floor.

The first floor will house the fine arts programs, which will include visual, instrumental and vocal arts classes. The second floor will house the social studies programs.

The roof of the building will feature a vegetation area surrounded by a glass curtain wall to be cared for by students. In addition, three 20,000 gallon outside water harvesting tanks will be located at the base of the building for rain collection and irrigation for the field behind the building.

S. M. Wilson will provide general contracting services for the project, which is expected to be completed in the fall of 2012. Wight & Company is architect for the project.

S. M. Wilson is a 90-year-old, full-service construction management, design/build and general contracting firm with headquarters in St. Louis. It is one of the largest general construction and construction management firms in the St. Louis area. The company posted $345 million in 2010 revenues, and ranks 149th in Engineering News-Record’s 2010 list of Top 400 commercial contractors nationwide.