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Construction company directory

Construction Companies in Connecticut

Our directory lists 89 construction companies in Connecticut across 55 cities, built from OpenStreetMap office records and the ENR Top 400 Contractors list. Norwich has the most listings. Each listing shows only the facts on record.

Companies
89 companies
Cities
55 cities
Ranked contractors
4 ENR Top 400 contractors

Which cities in Connecticut have the most construction companies?

Norwich has the most construction companies in Connecticut, with 9 listings, followed by Glastonbury. Pick a city to see every company listed there.

Which construction companies are listed in Connecticut?

These are the 30 most complete of the 89 construction companies listed in Connecticut, with ranked contractors first.

Search all 89 companies in Connecticut

Which large contractors are based in Connecticut?

O&G Industries is the highest-ranked contractor listed in Connecticut, at No. 159 on the ENR Top 400 Contractors list for 2026.

  1. 159O&G IndustriesMiddletown
  2. 159O&G Industries Inc.Torrington
  3. 178Gemma Power SystemsGlastonbury
  4. 220Clark ConstructionBranchville

What are the most common construction trades in Connecticut?

The most listed trade in Connecticut is hvac contractors, with 18 companies. A company can be listed under more than one trade.

How do I check a contractor's license in Connecticut?

Search the Connecticut Department of Consumer Protection by company name or license number before you hire. Connecticut has no single general contractor license. Search by registration type, such as home improvement contractor, new home construction contractor or major contractor.

Check a license in Connecticut

Licensing rules checked October 2026. Requirements change, so confirm on the state site.

FAQ

Construction companies in Connecticut: FAQs

How many construction companies are in Connecticut?

Our directory lists 89 construction companies in Connecticut, from OpenStreetMap office records and the ENR Top 400 Contractors list.

Which cities in Connecticut have the most construction companies?

Norwich (9), Glastonbury (7), Dayville (5), Bridgeport (4) and Fairfield (4) have the most listings in Connecticut.

How do I check a contractor's license in Connecticut?

Connecticut has no single general contractor license. Search by registration type, such as home improvement contractor, new home construction contractor or major contractor. Search the Connecticut Department of Consumer Protection by company or license number before you hire.

Which large contractors are based in Connecticut?

Ranked contractors listed in Connecticut include O&G Industries (No. 159), O&G Industries Inc. (No. 159), Gemma Power Systems (No. 178) and Clark Construction (No. 220) on the ENR Top 400 Contractors list for 2026.

What construction trades are most common in Connecticut?

The trades with the most listings in Connecticut are hvac contractors (18), plumbing contractors (14), roofing contractors (11) and landscaping contractors (9).

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Office locations © OpenStreetMap contributors, available under the Open Database License. Company rankings from the ENR Top 400 Contractors (2026).

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