SEMCOG collects building permit data from local governments in Southeast Michigan; the data include: single-family, two-family, condominium, and multi-family units. Building permits tell us what kind, and how much, of new residential housing is being constructed. New construction not only provides shelter, but also helps the region's economy to grow - creating a multiplier effect for industries that provide goods and services to households, as well as, providing new property tax revenue to local governments and school districts.