Sustainable, passive houses are just making their way into the mass market. One company is selling passive houses that are resistant to the most severe environmental stress. PassiveDom houses consume no energy for heating and cooling and have close to zero carbon emissions. The company offers two versions and have four modifications from a simple guest house to dream house, and even a Zombie Apocalypse resistant one. The budget version costs $90,000, while the most expensive one is $359,000.