Hi Bobby - thanks for replying.
I work (main job) as a teacher of Japanese taiko drumming. Wife and I are currently looking to either buy or build a house with an attached dojo.
I live in semi rural germany, so possible renovations would be for old houses with attached barns/stables. Most of these places have thick walls but we'd still build a room within a room and try and insulate further. Unfortunately, when you're talking of renovating a house older than 200 or 300 years, there can be a lot of hidden and unexpected costs, so predicting a budget is tough.
a newly built house gives you a pretty good estimate of costs upfront. The main concern is keeping the noise in and not bothering the neighbours. I teach in groups of 7-9 drummers. If you've ever heard/seen taiko, you know that's fairly loud. We'd be planning for around 50-60 sq meters. Muffling the noise inside the space is a secondary concern for now. If the neighbours complain, I lose income (and waste building costs).
I've been offered a couple of construction options here by builders, but I'd like to run them past someone with specific acoustics experience. They sound ok, but like I said, they're coming from builders who may not have the experience I'm looking for.
Is your background in this area mate, or have you done something similar yourself?
"A closed mouth gathers no feet"