The number of single-family and multi-family units permitted annually provides insight into construction activity, development patterns, and population growth within the county. The concentration of single-family, mid-rise, and high-rise development can impact how surrounding transportation and commercial development systems function. As increases in residential units reflect population growth or movement, this indicator may be used to estimate changes to the tax base and public school student enrollment on a year-to-year basis.
This indicator bridges the number of building permits issued in the county and the number of households in the county. For example, a duplex requires a single building permit, but is considered two permitted housing units.
Housing unit counts are released by the US Census Bureau, while residential building permit counts are released by the Wake County Revenue Department. Differences in how and when these numbers are calculated may account for the discrepancy between single-family units permitted and residential building permits issued.