Construction Companies in Illinois: 129 Verified Firms
Secwyn has verified 129 construction companies based in Illinois. The largest groups are Commercial and Institutional Building Construction (23); Electrical Contractors and Other Wiring Installation Contractors (20); and Plumbing, Heating, and Air-Conditioning Contractors (17). By headcount, 80% have 51–200 employees, 16% have 201–500 employees, and 4% fall in other size bands. Chicago has the most (16), followed by Elgin (6) and Elk Grove Village (6).
Company size
- 51–200 employees103 · 80%
- 201–500 employees21 · 16%
- 501–1,000 employees5 · 4%
Top cities
- Chicago16 · 12%
- Elgin6 · 5%
- Elk Grove Village6 · 5%
- Arlington Heights3 · 2%
- Hillside3 · 2%
- Lombard3 · 2%
Cities with fewer than 3 companies are not listed.
Largest sub-industries
| Sub-industry | NAICS | Companies |
|---|---|---|
| Commercial and Institutional Building Construction | 236220 | 23 |
| Electrical Contractors and Other Wiring Installation Contractors | 238210 | 20 |
| Plumbing, Heating, and Air-Conditioning Contractors | 238220 | 17 |
| Highway, Street, and Bridge Construction | 237310 | 10 |
| Roofing Contractors | 238160 | 10 |
| Site Preparation Contractors | 238910 | 9 |
| All Other Specialty Trade Contractors | 238990 | 8 |
| Drywall and Insulation Contractors | 238310 | 5 |
A sample of these companies
A few of the 129 construction companies in Illinois. Names, websites and contacts are shown after you sign up.
Company #1 · name shown after sign-up
Structural Steel and Precast Concrete Contractors · 51–200 employees
Company #2 · name shown after sign-up
Masonry Contractors · 51–200 employees
Company #3 · name shown after sign-up
Tile and Terrazzo Contractors · 51–200 employees
Company #4 · name shown after sign-up
Commercial and Institutional Building Construction · 51–200 employees · Chicago
Company #5 · name shown after sign-up
Site Preparation Contractors · 51–200 employees · Chicago
Company #6 · name shown after sign-up
Drywall and Insulation Contractors · 51–200 employees
Find the Illinois construction companies that fit what you sell
Describe what you sell and Secwyn shows the companies most likely to buy it, with the reasons for each match. Sign up free and your first 3 company reveals are on us: name, website, description with its source, contact channels and the roles to contact.
How Secwyn verifies these companies
- Every company description is a sentence visible on the company's own website. Inside the product, each one links to its source page.
- Each company has a NAICS industry code, the US government standard for classifying businesses.
- All companies are based in the United States. Location and size come from public sources, including company filings and People Data Labs.
Data updated October 6, 2026.