Korean housing market currently faces demographic changes such as the increase in single-person or elderly households and the deceleration of population growth. Based on these changes some researchers anticipate that the demand for small-sized housing units will dramatically increase. And they argue that the portion of small-sized units in housing construction has to be increased. We propose the use of quantile regression as a method for estimating the distributional change of dwelling sizes and forecast long-term housing demand. The advantage of using quantile regression is that it can produce estimates of changes in the distribution of a dependent variable. In light of this issue, the current study examines changes in the distribution of dwelling sizes in the Korean housing market during the past 35 years and estimates housing demand change based on existing trends. The results show that both the average size of housing units and the range of dwelling sizes have increased in the last 35 years. Quantile regression suggests that the estimated future housing demand suggests that demand for medium and large-sized units will increase despite the upward trend of one- or two- person households. These results imply that the demand for small housing units will not be dominant and the excessive construction of small-sized units should be avoided.