Quoted from DK:Your idea will not be cheap. May I suggest talking to a local bar and putting your Monopoly there so you make money/undo the burden of having a pin in your dining room?
You really need insurance and an LLC to properly protect yourself. Not cheap either, but less expensive than remodeling.
Quoted from Hoopoebird:Is this, like, a $5000 job, or a $50,000 job?
Maybe a $15k-$20k job, if you do a bunch of it yourself.
You'll probably need to hire an electrician to do the electrical work. If the cabling running to the garage isn't sufficient (and it probably isn't rated to run much more than a light bulb and motor), you'll probably need to run new lines to it to support one or several 20a circuits.
Insulation, sheetrocking, spackling, and painting isn't rocket science, so most reasonably handy people can do that with the proper tools and YouTube training. Labor is expensive, and the project cost would probably go up another $5-$10k if you hire out.
You'll have to ask your county clerk what permits you'll need. Because you'll need electrical work done, you'll need a permit for at least that, among some of the other improvements.
Possible, yes. Cheap...eh, not particularly.
