Urgent: How effective can a single-leaf structure be?

[Wurlitzer]

I'm having some real problems rationalising the various factors in building my planned double-leaf studio structure, against the need to maximise floor space for use as a rehearsal room. Some issues came up today as we were marking out the proposed foundations - I don't think my builder understood my need for maximum floor area, and I didn't understand how he proposed building the walls. To cut a long story short, proceeding according to his plan would involve a considerable loss of floor space from what I had anticipated.

Haven't got time to rejig and repost all the drawings etc right now, but I'm just turning various options around in my head. One is to forget the whole double-leaf thing and just build the most solid single leaf structure I can.

I couldn't find ANY info here about this. Is that because it's not gonna fly, right from the start? I'm thinking of 8" thick solid, high density concrete blocks for starters, rendered on both sides. Other materials could then be added to this if it would help.

What kind of results would be possible like this? Would it necessarily be WAY below those of a double leaf wall? Or could one get pretty close?

The room will be at the end of my garden so quite a way from the neighbours' houses.

We need to get going pretty soon, so quick opinions would be appreciated. Thanks.

[sharward]

Not gonna fly. You'd probably be better off with a double-leaf wall with the same 8" footprint than a solid 8" wall. Mass-air-mass. < 2 leaves is bad. > 2 leaves is bad. I'm oversimplifying, but that's the essence of it.