I actually wish people would do more of this (build underground) as it warms the house with the earth.
Genuinely think that building underground is the way forward - there was massive objections from people near me when someone built one on a infill site and all you could see at the end was a grass lawn (the roof). Lots of people eating their words after that. They interviewed the residents in the local paper (50 people objected initially) - they couldnt find one person to own up afterwards.