Revival Supply Co. miniscule dwellings can be put together by two people using an 11mm wrench about 4 hours, and flat-packed in 45 minutes. It’s got enough space for a queen mattress in its lofted bedroom, a shower/toilet area, and can be wired, plumbed, and insulated.
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!)