I'll crop those pics later when I'm not so damned tired. They're biggish.
Currently, the floor is concrete, with a 2'6" high concrete wall on three of the existing walls, as shown. everything else is framed and insulated, including the ceiling. I have forced hot air, so could pretty easily run heat from the furnace to this area. not sure how many heating vents I'd want/need there. Like the rest of the house, the outer walls have 2" of spray foam + r19 fiberglass, so the basement should be pretty damn energy efficient. The blue rectangle in the middle is where the support beam is across the top of the ceiling.
My plan right now is to finish the 12'8" x 14'4" (181 square feet) area (up to the support beam) and leave the section with the furnace and washer/dryer as storage and basement. That way only one door is needed to the furnace area and I get the most use of that space. I can't think of a way to do it otherwise that doesn't result in dead space. I thought about moving the washer/dryer over to the furnace, but there's not enough space over there unless i got a washer/dryer combo that can be stacked, and i can't stack because the hot water heater is mounted on the wall next to the furnace, in the corner. so the washer/dryer are pretty much stuck there. i suppose if i really wanted i could move them to the other room, the unfinished bathroom area, and make that a laundry/sink area. only problem there is there's not a ton of storage space in the house anyway, so that washer/dryer section is probably best kept as a storage space. as it is the bathroom area (not shown, i'll add it later) will be too. the last thing i want is to have to use the garage as storage, cause there goes my car.
I'm also thinking about putting a half-height door into the wall between the existing doorway and the outer wall with the window - that's where the stairs are. because it's a split entry, there's a good 3x6ish area under the entryway that is totally unused - could be a great place to store stuff like the christmas decorations.
There will also be a power box located on the wall to the right of the washer/dryer. When the house was built I had them run a line specifically for the purpose from the main power box in the garage - didn't really want to have to run something all the way to the garage later, since I knew I'd be wanting to power the basement, bathroom (if I ever finish it) and air conditioner. The garage has sheet rock and a finished ceiling, so running that line now would suck and probably involve conduit. I like my way better.
I'm pretty excited for this. I think it's gonna be a real nice space. Hopefully with everyone's help I can get a better idea of costs and what it's going to take, plus get the best possible use out of the space. I'm sure there are ideas I haven't considered yet.