This paper is continuation of the previous paper (Part 3). People in both, countries are aware that housing deteriorates with aging. Self-estimation of housing condition is higher in the U.S. than in Japan, where housing age is also a significant evaluation standard. In the U.S., only if the housing is to be rebuilt in the future, dweller's consciousness of its maintenance is low. However, in Japan it is low also among dwellers who intend to move. The Japanese who look positively to existing houses show high consciousness of housing maintenance. But Japanese with a merely temporary dwelling outlook lack such perspective. Thus, there is a clear relationship between the dweller' s intention and his/her housing maintenance consciousness. Japanese who live in a same house long-term tend to renovate their housing, while the ones planning to sell tend to refrain from renovating. In both countries, men do plenty of DIY tasks like carpentry or plastering. DIY and the consciousness of the education in housing maintenance skills at home is noticeably higher in the U.S. Most Japanese even deem it unnecessary.