We have a few rooms we work in.
First and the most used room is the Advisor's classroom. His room is one of the larger of the science classrooms in our school and it has the proper measures to take care of fire problems or anything like that.
Second most used room for robo-construction is the hallway right outside the science classrooms. Why? Because it's there, d'uh
We use another science room to do somt testing and smaller jobs in, but that room is mainly for business work and chairman's award writing, so we don't do much loud stuff in there.