Need a site plan or a stormwater design in Cook County, IL? Cook County has about 5,182,617 residents (2024 estimate) and 119 incorporated cities and towns. Describe your project once: licensed civil engineers who work in Cook County get back to you.
Site plan review in Cook County is handled by each city, or by the county in unincorporated areas.
Services available in Cook County
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Site plan, grading and utilities
Civil site plan with grading, utilities and access, sealed by a licensed engineer for the permit.
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Stormwater and drainage design
Drainage calculations and stormwater management design required by the city, county or state.
Frequently asked questions in Cook County
Do licensed civil engineers cover the whole of Cook County?
Most pros work across the county and neighboring counties. Enter your ZIP code in the form and we match you with pros who serve your exact area.
Civil Engineering Site Plans in Illinois: all counties
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.