Even though I am busy building my own tiny house, I still find myself thinking about building other houses (is that cheating on my tiny house? lol). From time to time I have been coming back to cob houses. I have thought about building a cob house if in the future I decide I need more space (get married or just want more space etc).
Cob is basically clay, sand and usually straw mixed together to be used as a building material, kinda like bricks, but the advantage is that most of the materials can be sourced on site or purchased cheaply. The houses are very strong, good at regulating temperature, are about the lightest impact home I know. They have their own aesthetic to them which I am beginning to warm up to. Here is a great video on them