Illinois climate & coatings drivers
- IECC climate zone: 5A
- Dominant residential substrate: Wood lap or shake — dominant pre-1990 substrate, drives full prep + caulk + prime + 2-coat
- Annual humidity tier: Moderate — typical continental humidity, standard topcoat formulations adequate
- UV exposure: Moderate — typical continental UV, standard binder packages adequate
- Salt-air corrosion zone: No salt-air corrosion exposure (interior continental)
- Freeze-thaw cycling: Very high — 100+ annual freeze-thaw cycles drive caulk-and-recaulk on every repaint
- VOC architectural coatings rule: OTC Phase II — 100 g/L flat exterior topcoat limit (Northeast/Mid-Atlantic)
Illinois licensing, lead-safe & permits
- License status: No statewide license — municipal credentials only
- License board: No statewide painting license — Chicago Department of Buildings issues municipal credentials; IL DPH Lead Abatement Contractor for pre-1978 work (official site)
- Permit: no permit required for repaint; Chicago Class B General Contractor registration required for any city residential repaint contract above $5,000
How exterior repaint costs vary in Illinois
State-specific code or insurance rule: Illinois Lead Poisoning Prevention Act (410 ILCS 45) imposes one of the most restrictive lead-safe regimes in the country — every Illinois residential painting contractor disturbing more than 2 square feet of pre-1978 painted surface must hold an Illinois Department of Public Health Lead Abatement Contractor license with the lead-safe Worker credential additionally required on every crew member, lowering the EPA RRP federal trigger threshold by half and adding $500-1,500 to typical pre-1978 Chicago, Rockford, and Peoria residential repaint scope.
Cities in Illinois
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