I believe this truly hobbit home is in Wales and was built by folks with no construction skills, simple tools and daring!! You can click on the first picture for more information on this one.
Now this next one really was constructed for someone (with more money than any one person should be allowed to have) to house his "extensive Tolkien collection".
This one I found on a blog that I have long since forgotten. I do think I remember that this one is somewhere in Oregon!!