Illinois climate, wind & energy-code drivers
- ENERGY STAR climate zone: Northern — coldest climates, U-factor priority (U ≤ 0.27 in coldest tier)
- IECC climate zone: 5A-6A
- Maximum U-factor: 0.3 (IECC 2021 + state amendments)
- Maximum SHGC: No limit (cold climate)
- ASCE 7-22 design wind speed: 105 mph (Risk Category II)
- Hurricane impact-rated requirement: No statewide impact-rated requirement
- Dominant residential frame material: Vinyl frame — dominant in most climates, lowest cost-per-window
- Historic-preservation overlay prevalence: High — multiple state-mapped historic districts with mandatory review
- EPA RRP lead-safe trigger (pre-1978 housing share): Very high — 60%+ pre-1978 housing share, mandatory EPA RRP lead-safe certification on every replacement
Illinois licensing, lead-safe & permits
- License status: No statewide license — municipal credentials only
- License board: No statewide window license — Cook County, City of Chicago, and most home-rule municipalities issue Building Contractor licenses (official site)
- Permit: city building permit required for window opening modification on new construction; Cook County and Chicago municipal licenses required; replacement-only same-size installs typically permit-exempt; Chicago Landmark Designation review required on every historic-district install
How window replacement costs vary in Illinois
State-specific code or insurance rule: Illinois is one of the few Midwest states without a statewide residential builder license — Cook County, City of Chicago, and most home-rule municipalities issue municipal Building Contractor licenses with Chicago specifically requiring a separate Class B General Contractor license with bond and examination, plus City of Chicago Landmark Designation Ordinance separately requires Commission on Chicago Landmarks review on every window replacement within Chicago's 60+ designated historic districts (Old Town, Lincoln Park East, Hyde Park, Pullman, Bronzeville, etc.) to ensure profile, glazing, and grille-pattern continuity with the surrounding 19th-century architectural overlay, with mandatory EPA RRP lead-safe certification on every Chicago, Aurora, Joliet, Naperville pre-1978 residential window replacement.
Cities in Illinois
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