Japanese houses are ruined on an average of 27 years, whereas the value of wooden detached houses becomes zero after 20 years. In the backdrop of change towards a sustainable society in Japan, “HOWS Renovation”, a renovation business, carry out repair, improve functions and provide robust housing that secure structural safety and environmental friendliness; leaving room for creativity in a simple and versatile residence. The corporation buys, renovates, sells secondhand houses and conducts activities to enhance user literacy for an essentially sustainable living in the coming 10 to 20 years.