Depending on where you live (local laws), you probably should check on whether or not you need a building permit to do what you're planning, IF what you modify
will be permanent making the garage part of your living space. There could be restrictions as to what you are allowed to do, again, if it's not temporary. It might
also change your property tax, if you add more square footage of living space, but you might be required to have a garage- so anything permanent, you should make
local inquiries first. If you do something without a permit, I think they can make you tear it all out, or fine you?