Illinois rainfall & drainage drivers
- Annual rainfall: 39 inches/yr — drives K-style sizing and downspout count
- Dominant residential gutter profile: 5-inch K-style seamless aluminum — dominant low-rainfall retrofit profile
- Ground snow load: 25 psf — drives gutter bracket spacing and ice-shield requirements
- Ice-dam risk tier: Moderate — periodic ice-dam events on north-facing eaves
- Hurricane wind tier: None
- Tree-canopy density: Moderate — mixed canopy, gutter guards optional
Illinois licensing & permits
- License status: No statewide license — municipal credentials only
- License board: No statewide gutter contractor license — Chicago and Cook County issue local credentials (official site)
- Permit: Chicago building permit not typically required for gutter-only installation; suburban Cook County issues independently
How gutter installation costs vary in Illinois
State-specific code or insurance rule: Illinois 415 ILCS 5/22.18b (Roof Drainage Act) is the only state law specifically requiring residential gutter discharge to be directed away from neighboring property and storm sewers when those storm sewers are at-capacity — making Illinois homeowners subject to civil action by neighbors and municipalities for roof runoff that contributes to flooding on adjacent parcels, with Chicago and Cook County enforcing the rule through stormwater management ordinances.
Cities in Illinois
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