The evolution of suburban relative housing-unit diversity

The diversity of housing-unit supply in suburban areas has been a central concern for planners and policy makers for at least 50 years. Absence of census crosstabulation data on housing unit structure-type by unit-size (number of bedrooms), has limited our understanding of the historical and regional evolution of relative suburban housing-unit diversity. I use census microdata to estimate measures of relative housing diversity between cities and suburbs, including the housing-unit portfolio compositions, and availability ratios of diverse housingunit types. Data are presented for the US, regions, metropolitan areas, and across different time periods. Effects of housing-unit supply on household structure and location are estimated. Results indicate that suburban areas, while growing in terms of the absolute number of diverse housing units constructed, are relatively undersupplying diverse housing units, thereby constraining households’ housing opportunities.