Also available in various configurations, the flatpack Britespace home is built to operate on- or off-grid with options for rainwater harvesting, rooftop solar and battery storage. It takes around six weeks to assemble, with the pictured stucco and weather-resistant hardwood siding among the options for the facade. The interior is finished in a tasteful mix of high-end materials, such as solid bamboo, maple cabinetry and oak flooring. Prices start at $90,000, not including installation.