Construction Companies in Wisconsin: 74 Verified Firms
Secwyn has verified 74 construction companies based in Wisconsin. The largest groups are Plumbing, Heating, and Air-Conditioning Contractors (13); Commercial and Institutional Building Construction (12); and Roofing Contractors (9). By headcount, 82% have 51–200 employees, 12% have 201–500 employees, and 5% fall in other size bands. Milwaukee has the most (7), followed by Brookfield (5) and Green Bay (4).
Company size
- 51–200 employees61 · 82%
- 201–500 employees9 · 12%
- 501–1,000 employees4 · 5%
Top cities
- Milwaukee7 · 9%
- Brookfield5 · 7%
- Green Bay4 · 5%
- Madison4 · 5%
Cities with fewer than 3 companies are not listed.
Largest sub-industries
| Sub-industry | NAICS | Companies |
|---|---|---|
| Plumbing, Heating, and Air-Conditioning Contractors | 238220 | 13 |
| Commercial and Institutional Building Construction | 236220 | 12 |
| Roofing Contractors | 238160 | 9 |
| Electrical Contractors and Other Wiring Installation Contractors | 238210 | 7 |
| Highway, Street, and Bridge Construction | 237310 | 7 |
| Poured Concrete Foundation and Structure Contractors | 238110 | 4 |
| All Other Specialty Trade Contractors | 238990 | 3 |
| Masonry Contractors | 238140 | 3 |
A sample of these companies
A few of the 74 construction companies in Wisconsin. Names, websites and contacts are shown after you sign up.
Company #1 · name shown after sign-up
Commercial and Institutional Building Construction · 51–200 employees
Company #2 · name shown after sign-up
Masonry Contractors · 51–200 employees · Milwaukee
Company #3 · name shown after sign-up
Electrical Contractors and Other Wiring Installation Contractors · 501–1,000 employees
Company #4 · name shown after sign-up
Roofing Contractors · 51–200 employees
Company #5 · name shown after sign-up
Structural Steel and Precast Concrete Contractors · 51–200 employees
Company #6 · name shown after sign-up
Plumbing, Heating, and Air-Conditioning Contractors · 51–200 employees
Find the Wisconsin 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.