Suporting the concepts which have been working on the text There are several changes social / cultural Japan supporting the text above, in 1998, a study showed that around 60% of singles Japanese and 80% of single women aged 20 to 34 still living with their parents. However, now itâ€™s not uncommon for young couples cohabit in an apartment before marriage. Therefore, the number of elderly people living at home with their children has led to a great demand for elderly care and â€œbarrier-freeâ€? dwelling, with fewer obstacles for the elderly. In recent years, Japan is undergoing a demographic and socio-economic change, and it is becoming common for young people to share apartments. In these yeas too, condominiums and mansions have become more and more popular. Compared with 1983, when 64% of households were owned houses and only 27% were condominiums, latest statistics show that the latter is now about 40% of the category. An important issue is old houses are replaced by the same owners. A common pattern is to rebuild in the same place. To accomplish this, the occupants move into a temporary residence. A contractor has to demolish the old structure and creates a new one in that location. Then residents can return to the same location. By not having moved, have the advantage of keeping the same address, telephone number, and utility bills, and avoid the cost of purchasing new land. Because wood construction and the relatively short lifespan of Japanese houses, this is often considered cheaper than maintaining the old structure.