There are many alternative building methods that rely on recycling or sustainable materials, e.g.
- Earthships (and other rammed earth techniques)
- Wattle and daub
- Straw bale
and even log cabins and shipping containers. A lot of these seem to be used in off-the-beaten-path locations because
- the people building them aren't living where they can earn a sizable living, so they depend on materials that they can harvest,
- there's much less access to readily-available standard building materials and
- there is much less of a requirement to meet stringent building codes.
Which sustainable building techniques have the best chance of passing building codes in locations where the requirements aren't so lenient?