Research
Roofing data and research
Plain tables from public data about roofing in the United States. Each story gives the finding first, then the full table, the method, the sources and the date. You can download every table as a CSV.
Which states do not license roofers
Twelve of the 51 jurisdictions (50 states and DC) have no state license or registration for roofers. Texas, the state with the most roofing establishments (20,406), is one of them. So are Georgia, Ohio, Colorado and New York. Together the twelve hold 42,877 of the 107,441 roofing establishments in the table, about 40 percent.
Read the storyHail days by metro area, 2016 to 2025
From 2016 to 2025, Rapid City, South Dakota had 102 days with hail 1 inch or larger, more than any other metro in our data. Colorado Springs (89) and Oklahoma City (71) come next, then Amarillo (60), and Wichita and Cheyenne (58 each). Texas has 12 of the top 50 metros, more than any other state.
Read the storyWhere building codes lag the current edition
Of the 51 jurisdictions, 31 set one residential code for the whole state or district. 23 of those 31 build on an International Residential Code (IRC) edition older than 2024, the newest edition any of them uses. Four still build on the 2015 IRC: Michigan, North Carolina, Kentucky and DC. Seven use a 2024 base, and 20 states have no single statewide edition.
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