AndyW

Thank you, that's sound advice. Damp will certainly be a problem with sweaty musicians! Constant fresh air seems the way to go then, with those silencers. So BC required two means of escape? I better look into that.

Haha, Creme Brulee! Thanks Jimbo, sounds like you built the real deal. Maybe I should put some windows in to satisfy the building regs and sod the neighbours!

Hey guys, thank you so much for letting me join the forum. What a great place to find honest, experienced opinions and information. I'm working on converting a garage into a soundproofed studio and need to work out some issues with insulation and particularly ventilation. The room is 19.38 square metres so suitable for a mini-split system, which also means fewer holes in walls where sound could leak. However, I can't find out whether this would satisfy Building regs. Ideally it won't have opening windows or trickle vents, and only has one door to the house's hallway (ie doesn't access fresh external air). I guess the alternative would be to have a constant air intake and out take with a heating/cooling system but obviously that's more holes, ducting and baffling. Any advice anyone has on this would be extremely useful. Thanks so much, Andy