The list starts with every business Google Maps files under roofing contractor in Minnesota and Wisconsin, kept to the ones located in Chisago and Washington counties on the Minnesota side and St. Croix, Pierce and Polk counties on the Wisconsin side. Firms on the Minnesota license list that work in the valley were added, wherever they are based.
A business stays if it is open and has been updated in the past year. General contractors who carry roofing only as a side label were taken out by hand. Where a company's own website says it replaces roofs, handles hail claims or removes ice dams, the listing says so. Where there was nothing to read, the listing says that too.
Owners can claim a listing to correct details or add photos. A person checks every claim. Published by Cooper Macinkovic.