As the Greater Philadelphia region's metropolitan planning organization (MPO), DVRPC provides technical assistance and services to its member state, county, and local governments; the private sector; and the public. Delaware Valley Data is our periodic series of free data bulletins, data snapshots, and analytical reports. Regional Data Bulletin #098 presents residential building permit data for 2010 through 2015 in the extended 28-county data services area. Residential construction activity data is derived from current reports and publications compiled by the U.S. Census Bureau's Residential Construction Statistics Division. Municipalities provide the Census Bureau with tabulations of the number of housing units authorized, according to types of structures. In the few cases where municipalities reported building permit activity for some months but not for all 12 months, the Census Bureau estimates the total yearly number of building permits based on past building permit activity.