Not quite the same - we had an extension built. We used a small local company. I got quotes from big firms, as well as smaller firms. The company we used, had the lowest quote, (and had more in it), the builder has some great ideas and was happy to tell us what would or would not work. Our extension was built in under a month. With no hassles at all.

I agree - go local - and the biggest is not always the best.