Simon Dale built this real life hobbit house, which is dug into hillside:
You are looking at pictures of our family home. It was built by myself and my father in law with help from passers by and visiting friends. 4 months after starting we were moved in and cosy. I estimate 1000-1500 man hours and £3000 put in to this point. Not really so much in house buying terms (roughly £60/sq m excluding labour).
Link | BuildLog