DROP Structures‘ Mono cabin is its signature product. It’s a prefabricated living space that measures only 8.5′ x 12′ x 16’, so you don’t need building permits for it in North America. It has lots of customization options, including furniture, heating and appliances.
EcoCapsule’s bubble-shaped off-grid living spaces contain a small bedroom, work area, kitchen, storage, and bathroom. Solar panels on the roof and an external windmill supply electricity, and its shape is designed to maximize rainwater capture. (Thanks Linda!)