Here it is: the grand tour of our new earth-sheltered house! I don't mention it in the video, but YES, YOU CAN HAVE INDOOR PLUMBING in an earth-sheltered house. However, where we live there are no codes dictating any such requirements. And since indoor plumbing causes a lot of problems and expense, we decided to live without it.
No, let me phrase that more positively. In our earth-sheltered house, we have chosen to be okay with toting fifteen or so gallons of water from our water storage tanks (filled up by rain) every day for drinking and cleaning, and having to take three trips or so a day to dump out a five-gallon bucket of graywater onto the garden.
Thus the old-fashioned faucet/sink comb and the composting toilet. ;)
Next year around this time I will do a video reporting on the indoor climate performance of the earth-sheltered house. So far, we are impressed. While we do have to run a dehumidifier a little bit each day, we do not have to run the heater at all. And this time of year, we had to run the heater most of the day (all day on cloudy days) to keep the indoor temp between 70 and 72 degrees. So we are definitely saving energy, despite the need for the dehumidifier.
If you are interested in having such a home built (and you can have it as big as you want; we chose small b/c we choose to live simply and frugally) please contact me at http://liveyourdreamswithemily.com/contact if you have any questions about our experiences with the house or builders.