Just stumbled on to this forum, I am looking for information on how to put an apartment in an existing pole barn/garage. My garage seems to have a good foundation. My questions is where to start, do I need to put plumbing in first? Or, can I have some one frame then plumb? I am limited on funds-and would like to pay for each improvement as I go. I have looked at the treads, and there are lots of helpful information-but I need a starting point. Info-Barn has been used for paint and body work so floor has some issues with oil and other fluids, it is 40 by 40 and about 20? high, divided in half with a wall- Any and all ideas would be appreciated -Note: I also live in Oklahoma so weather can be 104 in summer to 20 in winter, Thank you kae