Several years ago, I had to put an addition on my house. It was 16x24, with a bedroom, bathroom and laundry room. It cost me about $18000 total to do it. Yesterday, I got a visit from a guy that was giving me a price on an addition for my garage. The addition was to be 16 X 24 also. He told me that it would cost $23000. Evidently I picked the wrong career. Doing some quick figuring this morning, I figured that the materials would cost about $3500 plus concrete. That is one hell of a mark up for a job that should take about 2 days after the concrete is down. Now I wish I had gone into construction. It's not that I don't know how to do the work. I have build several garages in the past. I just can't physically do some of it anymore. With prices like that, I may have to figure it out though.