Construction Companies in California: 345 Verified Firms
Secwyn has verified 345 construction companies based in California. The largest groups are Commercial and Institutional Building Construction (51); Plumbing, Heating, and Air-Conditioning Contractors (47); and Electrical Contractors and Other Wiring Installation Contractors (42). By headcount, 81% have 51–200 employees, 16% have 201–500 employees, and 2% fall in other size bands. San Diego has the most (15), followed by Orange (11) and San Jose (11).
Company size
- 51–200 employees281 · 81%
- 201–500 employees56 · 16%
- 501–1,000 employees8 · 2%
Top cities
- San Diego15 · 4%
- Orange11 · 3%
- San Jose11 · 3%
- Los Angeles10 · 3%
- San Francisco10 · 3%
- Irvine9 · 3%
- Sacramento8 · 2%
- Concord7 · 2%
- Livermore7 · 2%
- Fresno6 · 2%
Cities with fewer than 3 companies are not listed.
Largest sub-industries
| Sub-industry | NAICS | Companies |
|---|---|---|
| Commercial and Institutional Building Construction | 236220 | 51 |
| Plumbing, Heating, and Air-Conditioning Contractors | 238220 | 47 |
| Electrical Contractors and Other Wiring Installation Contractors | 238210 | 42 |
| Roofing Contractors | 238160 | 32 |
| Poured Concrete Foundation and Structure Contractors | 238110 | 21 |
| Drywall and Insulation Contractors | 238310 | 19 |
| Painting and Wall Covering Contractors | 238320 | 19 |
| Site Preparation Contractors | 238910 | 17 |
A sample of these companies
A few of the 345 construction companies in California. 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
Plumbing, Heating, and Air-Conditioning Contractors · 51–200 employees · San Diego
Company #3 · name shown after sign-up
Drywall and Insulation Contractors · 51–200 employees · Santa Clara
Company #4 · name shown after sign-up
Poured Concrete Foundation and Structure Contractors · 51–200 employees · Redding
Company #5 · name shown after sign-up
Glass and Glazing Contractors · 51–200 employees
Company #6 · name shown after sign-up
Electrical Contractors and Other Wiring Installation Contractors · 51–200 employees · Livermore
Find the California 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.