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3,961 companies in Construction in Connecticut.
Explore 3,961 Construction in Connecticut listed with contact details, employee size, revenue, and NAICS/SIC codes. Compare suppliers and service providers side by side and reach the right companies directly, or view the same industry in Construction in California, Construction in Florida, Construction in Texas.
From painting, roofing and glass contractors to general builders and structural steel fabricators, these are the construction companies on file in Connecticut. Open any profile for its location, size and NAICS code. Quote-to-order rates for these segments: Manufacturing sales by segment, 2026.
Of the 3,957 with a known headcount, 96% employ 1-50 people and 6 employ more than 1,000. 95% of those reporting revenue are under $10M, while 4 report more than $1B. The largest by revenue include EMCOR Group Inc (Norwalk), EMCOR Construction Services Inc (Norwalk) and Power (Chester).
Largest Construction in Connecticut companies by revenue
The highest-revenue companies in this directory. Open any profile for its full firmographics.
| # | Company | Location | Employees | Revenue |
|---|---|---|---|---|
| 1 | EMCOR Group Inc | Norwalk | 44,000 | $17B |
| 2 | EMCOR Construction Services Inc | Norwalk | 5,000 | $3.2B |
| 3 | Power | Chester | 3,000 | $1.7B |
| 4 | TRC Companies | Windsor | 8,000 | $1.7B |
| 5 | Gemma Power Systems LLC | Glastonbury | 195 | $611M |
| 6 | EPROM Co | Cairo | 2,554 | $606M |
| 7 | O&G Industries Inc | Torrington | 900 | $567M |
| 8 | Becon Inc | Bloomfield | 1,822 | $328M |
| 9 | KBE Building Corp | Farmington | 170 | $323M |
| 10 | AP Construction Co | Stamford | 98 | $106M |
These pages show the first 480 of 3,961 companies. Narrow the list with the filters above or open one of the related lists below to see the rest.
Construction in Connecticut companies by size and revenue
| Employees | Companies | Share |
|---|---|---|
| 1-50 | 3,796 | 95.9% |
| 51-200 | 124 | 3.1% |
| 201-1000 | 31 | 0.8% |
| 1001-5000 | 4 | 0.1% |
| 5001+ | 2 | 0.1% |
| Revenue | Companies | Share |
|---|---|---|
| Under $10M | 3,753 | 95.3% |
| $10M-$50M | 158 | 4.0% |
| $50M-$250M | 20 | 0.5% |
| $250M-$1B | 5 | 0.1% |
| $1B+ | 4 | 0.1% |
Share is of companies with a known value — 3,957 with headcount and 3,940 with revenue on file, as of Jul 17, 2026.
Frequently asked questions
How many Construction in Connecticut are there?
There are 3,961 Construction in Connecticut in the directory. Use the filters to narrow by employee count, revenue, or NAICS/SIC code.
How many large companies are in Construction in Connecticut?
9 of the 3,961 companies in Construction in Connecticut employ more than 500 people, and 4 report over $1 billion in annual revenue. See the size and revenue breakdown above for the full distribution.
What size are most Construction in Connecticut companies?
Most are small and mid-sized businesses: the size and revenue tables above show the full spread, from under $10M up to $1B+, across the 3,940 companies with revenue on file.
What information is included for each company?
Every listing includes the company name, location, website, employee size, revenue range where available, and NAICS/SIC classification, with a link to the full profile.
Where does this directory come from?
Listings are compiled and maintained by Factur, a sales and marketing firm for B2B manufacturers. Any company can request an update or removal from its profile page.