Mechanicville High School opened a new gymnasium and a library media center in the winter of 2003.

During this time, a chemistry and physics science lab was also built.

Thelab allows students who take chemistry and physics the opportunity to participate in all the lab requirements mandated by the New York State Regents, as well as those recommended by various colleges and universities.

In September 2003, the Middle School portion occupied a new addition which houses a Science Lab, a Technology classroom complete with a video production area, a Family and Consumer Science suite along with three classrooms and a Middle School Cafeteria.

However, it was closed down in 2008 and in 2015–16 a new building project was granted to the school which renovated it into a café.