Prefabricated buildings
Prefabricated buildings, especially houses, potentially have a big advantage in housing affordability. In recent times, attempts have been made to make high quality, environmentally friendly prefabricated buildings.
The most prominent example is the hexayurt.
Michelle Kaufmann Designs has developed the Glidehouse™ as well as other "green prefab" designs (e.g. the retreat homes described here: Growing Greener Prefab).
