I have a little summer house in my garden - it's insulated and has an electrical supply, so it's cosy even in winter! I've got a 'clean' area for drawing, designing, beading etc and a separate area for silver work, soldering, drilling etc. The 2 areas are separated a bit with some storage.
I can go in there (usually with the dog and 2 cats) and play to my heart's content:-)