This summer I would like to build a separate exterior structure in my back yard that I will make into a dedicated listening room. So, the first thing I need to get to a contractor to get the ball rolling is a plan so that I can get a permit. Generally speaking, what would a good size be for this? I seem to recall that the ceiling height sort of determines the rest of the room measurements. I imagine I will aim for a 9' or 10' ceiling. My current setup is in my basement which is 25' x 15 with a 7' open joist ceiling. I'm not a millionaire, and this is sort of going to be a "glorified" shed, so to speak; I doubt I will build this on a concrete slab (good chunk of more money...) and I believe that would be more $ in permits, etc. as it would then be considered a "permanent" structure, vs. a "moveable" one. I do plan to finish it as best I can within my budget, which is around 20k for the structure up to insulation and drywall (once the actual framing and roofing is done, I will take it from there and finish everything else myself). I will have more questions as I move along, but this is the first big one I need help with. Thanks, everyone!