I'm getting ready to start on a project to convert our attached single-car garage into a mud room/workshop. I'm going to put a partition wall in the space to divide the areas.
Currently the garage is served my a single 20-amp circuit that also services some porch lights and ceiling light fixtures in the house. There are three outlets on in the garage. Right now, the washing machine and garage door opener are the only appliances plugged into the circuit. We also have plans to obtain a chest freezer at some point and put it on one of the outlets.
I need to put some electrical service into the shop area of the garage, and want to know if an additional 20-amp circuit is sufficient. I plan on running power rails down each side of the shop, and I'll have a TV and several consumer-grade power tools (saws, drills, etc.), although the chances of me utilizing more than a couple of tools simultaneously is pretty slim.
My concern is that the our service box is already full... I'll need to convert one of the two remaining single-pole breakers to a tandem breaker to get my shop service working. Do I need also split the mudroom into two circuits, since I'll have two large appliances in that room? We've also kicked around the idea of replacing the porch light with some flood lights for the backyard.
We just bought this house and have all sorts of pie-in-sky dreams about how to fix it up... I'm just trying to figure out what we can reasonably accomplish before we start investing in these projects.