most of the new homes being built around here are on a slab. older homes are all built with a crawl space. I am putting together plans for a small building as much for use, as for "practice" building a substantial structure. I keep coming back to the idea that I would prefer to have a building with a crawl space. it seems much less daunting as far as actual construction because I can do a bit at a time, it seems it would be easier to plumb and run electric both as far as planning and construction as well as offering the option to alter utility lines later if need be withoutout jackhammering concrete out (aka... if I screw up the first time). I also would not have to pay for the concrete and pro finishers and feel I could confidently plan and construct it myself. (keep in mind this is all in practice for a future larger scale project (home) not just easiest ways to build a small building.) what are the real advantages of a slab foundation that makes them used more often (currently)?