The four deep pages
| Page | Why it is different |
|---|---|
| City of St. Louis | 58% pre-1940, brick, eighteen historic districts under CRO review, its own permit rule, lead-safe on 86% of housing, the 2025 tornado path |
| Kirkwood, Webster Groves, University City and the inner ring | Pre-war wood and brick under municipal rules, local preservation commissions, mature canopy, the tornado's touchdown in Clayton–Richmond Heights |
| Florissant and North County | The 1950s–60s ranch belt — steel casements and aluminum sliders, full-frame nearly everywhere, lead-safe on nearly every house |
| St. Charles County | 75% post-1980, builder vinyl, the County's four-window permit rule, 30-inch frost and "Severe" weathering, March 2024 hail, HOAs |
Everywhere else
- South County (Affton, Mehlville, Oakville, Lemay, Concord, Crestwood, Sunset Hills): 1950s–70s ranches and 1980s subdivisions — the North County page's metal-sash notes and the St. Charles page's vinyl notes between them cover it. Permits through St. Louis County or the municipality.
- West County (Chesterfield, Ballwin, Manchester, Wildwood, Des Peres, Town and Country, Creve Coeur, Ladue): 1960s–90s frame houses with brick fronts; Chesterfield is 54% post-1980, Wildwood 85%. Ballwin requires a city contractor licence and an active St. Louis County trade licence before a permit is pulled; we confirm what each city requires before quoting.
- Jefferson County (Arnold, Festus, Imperial, Hillsboro): mostly 1970s onward, frame; 41% pre-1980. County and municipal permits.
- Franklin County (Pacific, Eureka edge, Washington, Union): rural and small-town; measure visits scheduled in batches.
- Metro East (Edwardsville, Glen Carbon, Collinsville, Granite City, Belleville, Fairview Heights, O'Fallon IL, Shiloh, Alton): Illinois permits and contractor registration by municipality; a housing mix from 1880s river-town brick (Alton 28% pre-1940, Belleville 26%) to 2000s subdivisions (Shiloh 86% post-1980); the 2025 tornado crossed into Madison County and ended near Granite City. A Metro East page is next in line if the work there justifies it.
Permit authorities, at a glance
| Area | Who issues permits | Same-size replacement |
|---|---|---|
| City of St. Louis | Building Division (+ CRO in historic districts) | No permit; CRO approval in districts |
| St. Louis County unincorporated | County Public Works | Confirm |
| St. Louis County municipalities (~90) | Each city | Confirm per city |
| St. Charles County unincorporated | County Building Division | No permit for 3 or fewer; permit at 4+ |
| St. Charles County municipalities | Each city | Confirm per city |
| Jefferson, Franklin counties | County and municipalities | Confirm |
| Madison, St. Clair counties IL | Each municipality | Confirm |
Full detail and sources: the permits guide.