My woodworking workshop is a small 14x10 steel shed built in my back yard. Although it is said to be 14x10, but actual size is smaller. In order to make it usable during winter time, I built the frames inside of shed, so I can place insulation to prevent heat lose in winter, also help to reduce heat from outside during summer time. This actually worked very well. With a electric heater inside, I could work in winter time. However, this reduced the working area even more, so I would say I only have about 12.5 x 9.5 area.
Originally, I have installed a power line of 14/2, which could only provide me with 15 Amp current, bearly enough to run my power tools. I finally decided to upgrade the electricity, and also make some some simple cabinets to organize my stuff.