Here's the clean slate for what I have/had to work with. The theater room is on the left, the rest of the basement is on the right. I have to somehow find room to fit a bathroom, bedroom, and laundry.
The diagram above just shows the 12" concrete block walls, and measurements are not the finished area. At one point a previous owner built an addition and expanded the foundation. The basement part of the addition is where the theater goes. You can see that the original foundation wall still separates the two areas and will make for interesting sound isolation options.
Here are pictures of the theater from before construction right when I started demo. They start from the doorway and move right to left.
Fireplace on west wall
As you can see the room turned into a place to store junk, keep the treadmill, and also as a way to run low voltage to various places in the living room above. Time to make it into a real usable space!
If you notice there's a very short knee wall / shelf on the east wall. Since this is a sub-basement (see small stairs) that shelf is structural and supports the footings for the original foundation. Unfortunately it means I lose about a foot of floor space and is the reason I gave two dimensions in the layout.
I peeled off drywall in one corner, and it turns out they framed with furring strips and used white foam boards for insulation. Time to go Mike Holmes on this [email protected]
I wish I had good pictures of the demo. Needless to say after two full pickup loads to the dump and one big ass bonfire, it's ready for some real work.