Is it expensive to have a finished garage?

There is really no way of getting you an exact quote not knowing the city and state in which you live or the cost of living in your area. I know here in KY you can get a building erected around a 24x32 with one overhead garage door and one standard entry door for around 5k. That does not include the floor or insulation. That is just under roof with no frills. Again, depending on where you live. If your going to do most of the work yourself I would suggest you go to your nearest do it yourself store and give them the size of the garage your wanting to build and they can give you a rough estimate of that the materials alone will cost you less labor. Have them run you one without it being finished and another one with it being finished to compare the two. Hope this helps.