basement under addition--bad idea?
I'm in an area of CA that doesn't do basements. Older homes have them, but most of what's out here was built after 1950 on crawl spaces or slabs.
We are in the early stages of planning an addition and wondering if a basement is a stupid idea. We can't build to over 17 feet at the top of the roof ridge but would certainly like to have double the space on the same footprint.
Are there reasons (other than expense which is probably pretty darn large in this seismically active area) not to put a basement in an addition? There must be a reason people don't do it here where people want bigger homes but don't want to move. Surely it's not because they didn't think of it! I must be missing something.