This is a new housing model that the government has proposed for the housing industry. Wooden houses in Japan have an average lifespan of about 25 years, so that it is possible that a house will come down before its owner has finished paying the mortgage on it, which can be up to 35 years. Houses that are torn down after such a short period of use also have a large impact on the earth’s environment. However to build a strong structure that can stand for many years requires construction costs that are 20% to 30% higher than current construction costs. Thus, there is the problem of whether such high construction costs increases can be borne so that houses can last 200 years into the future.