To the present, it has been difficult to know the reality building stocks in Japan, this study proposes to observe a trend for stock and demolition of wooden dwelling houses. The study calculated the trend with using the average life span in Osaka 3 districts by fixed property ledgers. In the result, the trend was clarified on following 4 aspects.
1. The stock is previously on a downward trend.
2. The demolition will be over the stock in 2030.
3. The stock is under way to be renewed steadily.
4. The trend may be greatly influenced by location of the district.
