The housing sector in bankbook has been described as a model for other fast growing Asian cities, because of the shift by the private sector into low cost housing initially row houses, later apartments. This article reviews the factors that contributes to the down market trend : the stronger demand for housing as a result of rapid economic growth, the supply by a dynamic private sector constantly in search of a new markets, the housing policy of the Thai government and the efficiently operation housing finance system. However, many low cost housing units are vacant while many low income families still live in slums and squatter settlements.