Typical Phase 1 ESA cost in Illinois
$2,200–$4,950
per standard commercial parcel
Compiled from published 2026 industry cost guides (+10% vs. the $2,000-$4,500 national baseline). Full methodology on the cost data page.
Phase 1 Environmental Site Assessment Cost in Illinois
Illinois runs a modest premium above the national baseline in the published cost data, driven almost entirely by Chicago. The city's century-plus industrial and rail history, combined with a dense concentration of state and federal cleanup sites in Cook County, means Phase 1 ESA consultants working in Chicago typically review more historical records than a consultant working a rural Illinois site.
What tends to drive cost up in Illinois
Chicago's industrial corridors along the rail lines and the Chicago River carry a long manufacturing and rail-yard history, which is a recurring source of recognized environmental conditions: former foundries, chemical distributors, and rail-adjacent fueling operations all show up regularly in the historical review.
Looking for a specific city? See Phase 1 ESA in Chicago, Illinois, the largest commercial real estate market in the state.
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Frequently asked questions: Illinois
Why is Chicago more expensive than the Illinois average implies?
The statewide premium reported in cost guides (about 10% above the national baseline) reflects Chicago's density of historical industrial and rail-yard sites, which usually means more records for a consultant to review even before any site visit.
Do older Chicago industrial buildings need a Phase 2 more often?
A Phase 2 ESA is only triggered when the Phase 1 finds a recognized environmental condition. Chicago's industrial history means that happens somewhat more often than in newer suburban construction, but it's never automatic, it depends on what the historical research and site visit actually turn up.
Does downtown Chicago cost more than the suburbs?
Consultant travel time and local records access can shift pricing modestly within a metro, but the state-level premium is the bigger driver of Illinois pricing compared to lower-density Midwestern states.
Other states
Compare the state-level Phase 1 ESA cost range in other active commercial real estate markets.