Anyone ever think about building a dedicated room?

The family that owns the house has become like family to us also. There lot is probably between three to five acres in the forest. I was wondering how much it might cost to just build a shed type structure that I could use as an audio room and then one day when we moved out they could use it for whatever they wanted to.

Lol, uh thanks, I think. I knew I could count on you guys for your wisdom. I think I'll be packing up my rig for safe keeping and buying a back up system that I don't really care if, and when, it gets knocked over or peed on by a completely loved and unruly cat, I.e. tucker the non-audiophile cat. Hmmm, maybe it's time to start looking at headphones....

Shakey, that's the plan in the long run but for now, it would be nice if I could build a freestanding structure in the backyard that could later be a shed, or whatever. If I could do it for a few grand, it might be worth it to me. The apartment, or guest area of the house consists of a kitchen, small din inning area, bathroom, walk in closet and a main room that doubles as a bedroom / living room. That room is probably 15 wide by 20 deep but it shares part of a wall with the master bedroom and my girl would be there quite a bit so I wouldn't be able to crank it up, grab a beer, close my eyes and get into it the way I like to. She lives there not only rent free, but is getting paid $350 a month so I'd like to stay there for a year or two while we save up a nice down payment for a house. Besides that, the apartment is pretty nice. It's like an $800,000 house in a gated community. Not bad digs for free, I just need my audio fix.