This is a popular question. I've been in some preliminary talks with a potential new client for a design and supervisory role on a new home studio build in my area. The obvious question is how much, the reply, well..... It depends. So many variables exist in studio construction it's very different than any other type of construction in a home. So as a preliminary starting talking point I have him a basic structural materials cost estimate. This was based on the alloted area 22'x24' with two rectanglular rooms, divided by a double wall assembly. Very crude, but a starting point, and a weigh to address some basic cost vs benefit stuff. Since rooms of these sizes are so common in the home studio boom I thought it might be useful. It also be great to hear from the others who have built, or had studios built for them, to get a scope of studio costs in general. I'll attach the cover sheet full size and the breakdown in the attachments. I'll also include one preliminary layout, which is non rectangular, and based closely of the picture on the cover of Build It Like The Pros.