Apprenticeship Sponsor — page 5 of 20
5,826 businesses with an active “Apprenticeship Sponsor” credential — administered by the Department of Labor. State file of October 1, 2026.
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| Place | Business | Record | Credentials | Latest expiration |
|---|---|---|---|---|
| Norwalk, CT | Climate Care, LLC | 19B76BDCE2 | Apprenticeship Sponsor | Jun 30, 2025 |
| East Haven, CT | Climate Control Corporation | DAB6D87C7E | Apprenticeship Sponsor | Jun 30, 2015 |
| Meriden, CT | Climate Creator, LLC | 8238AC34BC | Apprenticeship Sponsor | Jun 30, 2016 |
| Clinton, CT | Climate Masters, LLC | 4F0D6FCDD3 | Apprenticeship Sponsor | Jun 30, 2026 |
| Milford, CT | Climate Partners, LLC | D2A6020B39 | Apprenticeship Sponsor | Jun 30, 2025 |
| Plainville, CT | Climate Technologies, Inc. | F30D986919 | Apprenticeship Sponsor | Jun 30, 2010 |
| Wallingford, CT | Climatech Mechanical Services Inc. | 7C4C20E0D2 | Apprenticeship Sponsor | Jun 30, 2022 |
| Clinton, CT | CLINTON GLASS LLC | 1F0438E062 | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| North Haven, CT | CLINTONVILLE OIL | 962D8632B3 | Home Heating Fuel Dealer + 2 more | Sep 30, 2027 |
| West Hartford, CT | Clog Master, LLC | C553098B76 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Waterbury, CT | Cly-Del Mfg. Company | 9A13B1345B | Apprenticeship Sponsor | Jun 30, 2025 |
| Wallingford, CT | CMC Energy Services, Inc. | 9A6E3F6FFD | Apprenticeship Sponsor | Jun 30, 2023 |
| Bethany, CT | CMR Electric, LLC | 4CE0B3484A | Apprenticeship Sponsor | Jun 30, 2027 |
| Trumbull, CT | CMS Engineering LLC | 1770095A9C | Apprenticeship Sponsor | Jun 30, 2008 |
| South Windsor, CT | CNC-Microtech division of Noblehouse Technologies | BA38DB7E9F | Apprenticeship Sponsor | Jun 30, 2018 |
| Storrs, CT | CNM Heating Cooling & Piping LLC | 21221BF029 | Apprenticeship Sponsor | Jun 30, 2027 |
| Fairfield, CT | COASTAL ELECTRICAL CONTRACTORS, LLC | E92418ABE8 | Apprenticeship Sponsor | Jun 30, 2023 |
| Groton, CT | Coastal Group Electric | 26E47FB201 | Apprenticeship Sponsor | Jun 30, 2027 |
| Milford, CT | Coastal Inc. | D424137E47 | Apprenticeship Sponsor | Jun 30, 2027 |
| Stratford, CT | COASTAL MECHANICAL SERVICES INC. | D69591843B | Apprenticeship Sponsor | Jun 30, 2027 |
| Middlefield, CT | COASTLAND ENTERPRISES LLC | 7FAFD17A33 | Major Contractor + 2 more | Jun 30, 2027 |
| Norwalk, CT | COASTLINE FUEL | D0E5D4DD0E | Home Heating Fuel Dealer + 1 more | Sep 30, 2027 |
| West Haven, CT | Coastline Mechanical Services, LLC | 68DFCF4942 | Apprenticeship Sponsor | Jun 30, 2022 |
| Tolland, CT | Codan Electric LLC | F980956A44 | Apprenticeship Sponsor | Jun 30, 2024 |
| New Britain, CT | Cody Plumbing & Heating Co. Inc. | 838466B767 | Apprenticeship Sponsor | Jun 30, 2006 |
| Glastonbury, CT | Cofiell Electric | FA26E50822 | Apprenticeship Sponsor | Jun 30, 2006 |
| Worcester, MA | Cogswell Sprinkler Co., Inc. | 1930E38959 | Apprenticeship Sponsor | Jun 30, 2017 |
| Monroe, CT | COHERENT CORP | 8333CFFFC7 | Apprenticeship Sponsor | Jun 30, 2027 |
| Reading, MA | Colbert Electrical Co., Inc. | 9520BC8D26 | Apprenticeship Sponsor | Jun 30, 2013 |
| Winsted, CT | Coldfire Mechanical, LLC | 59C42935F6 | Apprenticeship Sponsor | Jun 30, 2027 |
| Terryville, CT | Coldform Incorporated | FABDB7DAF3 | Apprenticeship Sponsor | Jun 30, 2009 |
| Seymour, CT | Cole Heating & Cooling, Inc. | 8D1B2ECFC5 | Apprenticeship Sponsor | Jun 30, 2023 |
| Woodbury, CT | Cole Mechanical LLC | 38EF8CED16 | Apprenticeship Sponsor | Jun 30, 2022 |
| Barkhamsted, CT | COLEMAN'S PLUMBING AND HEATING LLC | A01A8367A9 | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| New Britain, CT | Collier Electrical Corp. | E6B8E80EF0 | Apprenticeship Sponsor | Jun 30, 2027 |
| Bozrah, CT | COLLINS & JEWELL COMPANY INC | 4E622E32D9 | Major Contractor + 1 more | Jun 30, 2027 |
| Prospect, CT | Colonial Irrigation LLC | 795479AB76 | Apprenticeship Sponsor | Jun 30, 2011 |
| Wallingford, CT | Colonial Refrigeration & Air Conditioning | D72096AE00 | Apprenticeship Sponsor | Jun 30, 2004 |
| Bristol, CT | Colonial Spring Company | 0BE04E87DD | Apprenticeship Sponsor | Jun 30, 2023 |
| Woodbridge, CT | COLONNA MASONRY CONCRETE AND ASPHALT PAVING LLC | 986E9ECAB7 | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| South Windsor, CT | Colony Plumbing | 0298A3C93F | Apprenticeship Sponsor | Jun 30, 2020 |
| North Windham, CT | Columbia Sheet Metal | 513AA8AC13 | Apprenticeship Sponsor | Jun 30, 2027 |
| Shelton, CT | Combined Technologies Corporation-SESSCO | 7CE8A2B383 | Apprenticeship Sponsor | — |
| East Windsor, CT | Combustion Mechanical Services, Inc. | 5B9AE37B7B | Apprenticeship Sponsor | Jun 30, 2019 |
| Coventry, CT | Comella Plumbing & Heating, LLC | 42E5CCB4EE | Apprenticeship Sponsor | Jun 30, 2018 |
| Stonington, CT | Comfort Pro LLC | 1F5350B6FF | Apprenticeship Sponsor | Jun 30, 2010 |
| Southington, CT | Comfort Solutions Heating & Cooling, LLC | 19E9ECC20C | Apprenticeship Sponsor | Jun 30, 2027 |
| East Syracuse, NY | Comfort Systems USA (Syracuse) Inc. dba Woodcock & Armani Mechanical Contractors | C65C3235FC | Apprenticeship Sponsor | Jun 30, 2010 |
| Windsor, CT | Comfort Systems USA Hartford | 2A7C35CBF0 | Apprenticeship Sponsor | Jun 30, 2009 |
| West Haven, CT | Comfort Zone Heating & Air Conditioning | 93C75CF2A6 | Apprenticeship Sponsor | Jun 30, 2013 |
| Watertown, CT | Comfort Zone Heating & Cooling | A6C5724939 | Apprenticeship Sponsor | Jun 30, 2008 |
| Westerly, RI | Comfort Zone, Inc. | 341017611B | Apprenticeship Sponsor | Jun 30, 2027 |
| Milford, CT | Comfortable Environments, LLC | 464BF9CDAC | Apprenticeship Sponsor | Jun 30, 2017 |
| Bloomfield, CT | Comm1data | 889C56CADF | Apprenticeship Sponsor | Jun 30, 2026 |
| East Granby, CT | Command Corporation | 46F6644EBD | Apprenticeship Sponsor | Jun 30, 2027 |
| North Branford, CT | Commercial Air Services, Inc. | F95160288B | Apprenticeship Sponsor | Jun 30, 2018 |
| Middletown, CT | Commercial Electrical Contractors | 9BD270632D | Apprenticeship Sponsor | Jun 30, 2007 |
| Worcester, MA | Commercial Electrical Contractors, Inc. | 7D2189EBB5 | Apprenticeship Sponsor | Jun 30, 2009 |
| Hamden, CT | Commercial Electrical Maintenance | 1A5330162D | Apprenticeship Sponsor | Jun 30, 2009 |
| Middletown, CT | Commercial Electrical Systems, LLC Star Mill - Box 9 | 9025452C37 | Apprenticeship Sponsor | Jun 30, 2027 |
| Bridgeport, CT | Commercial Glass | 9F54A79679 | Apprenticeship Sponsor | Jun 30, 2027 |
| Milford, CT | Commercial Kitchens, Inc. | B9F3C758B6 | Apprenticeship Sponsor | Jun 30, 2027 |
| Watertown, CT | COMMERCIAL PROPERTY SERVICES LLC | 5977422DF1 | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Torrington, CT | Commercial Sewing, Inc. | 9A41958189 | Apprenticeship Sponsor | Jun 30, 2023 |
| South Windsor, CT | Commercial Storefront Services Inc. | EC5BB6D2FA | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Worcester, MA | Commonwealth Electrical Technologies, Inc. | 20877EC683 | Apprenticeship Sponsor | Jun 30, 2027 |
| Hartford, CT | Community Renewal Team ECE | A1090B3118 | Apprenticeship Sponsor | Jun 30, 2027 |
| Marlborough, CT | Commuter Oil Delivery, Inc. | 353B0AEBBA | Apprenticeship Sponsor | Jun 30, 2010 |
| Bethel, CT | COMNET COMMUNICATIONS, LLC | C0874A4ED1 | Apprenticeship Sponsor | Jun 30, 2027 |
| Southington, CT | Companion Industries, Inc. | 914FFD4348 | Apprenticeship Sponsor | Jun 30, 2027 |
| Danbury, CT | Competitive Electric | 1EFA137E1D | Apprenticeship Sponsor | Jun 30, 2007 |
| Waterbury, CT | Competitive Tool, Inc. | D662B50514 | Apprenticeship Sponsor | — |
| Southington, CT | Complete Comfort Heating & Cooling, LLC | 9056BE9A5B | Apprenticeship Sponsor | Jun 30, 2023 |
| Ellington, CT | Complete Electric, LLC | 415B83751E | Apprenticeship Sponsor | Jun 30, 2019 |
| Plantsville, CT | Complete Fire Protection, LLC | BCA9AF8B49 | Apprenticeship Sponsor | Jun 30, 2026 |
| Berlin, CT | Complete Sheet Metal | 80879F2BC1 | Apprenticeship Sponsor | — |
| Broad Brook, CT | Compliance Piping & Testing, LLC | A886098E83 | Apprenticeship Sponsor | Jun 30, 2008 |
| Wallingford, CT | Component Engineers, Inc. | 722A1BB80B | Apprenticeship Sponsor | Jun 30, 2027 |
| Willington, CT | Con Serv Inc. | 4EF74676CD | Apprenticeship Sponsor | Jun 30, 2018 |
| Naugatuck, CT | Concentric Tool & Manufacturing Co.,Inc. | A665B3BAC5 | Apprenticeship Sponsor | Jun 30, 2022 |
| North Haven, CT | Conditioned Air Systems, Inc. | 7AAFE92F9A | Apprenticeship Sponsor | Jun 30, 2017 |
| Waterford, CT | Condon & Sons Electric, LLC | 4C29CBD69F | Apprenticeship Sponsor | Jun 30, 2016 |
| Branford, CT | Conforte Electric Company, LLC | 516911E3F7 | Apprenticeship Sponsor | Jun 30, 2017 |
| Glastonbury, CT | Conn Plumbing Heating LLC | 0AFC6C8525 | Apprenticeship Sponsor | Jun 30, 2012 |
| Berlin, CT | Conn Serv Mechanical Services LLC | BA64FA2CF5 | Apprenticeship Sponsor | Jun 30, 2023 |
| Milford, CT | Conn. Fire Protection & Sprinkler Services Co | EDFD2A7FF0 | Apprenticeship Sponsor | Jun 30, 2014 |
| Durham, CT | Connect Electric, Inc. | 11B809BDE2 | Apprenticeship Sponsor | Jun 30, 2027 |
| Old Lyme, CT | Connected Systems, LLC | 9CBEBD3C59 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Manchester, CT | Connecti-Cuts Unisex | 1ACFE53F32 | Apprenticeship Sponsor | Jun 30, 2023 |
| West Hartford, CT | Connecti-Cuts, LLC | 6167510F79 | Apprenticeship Sponsor | Jun 30, 2027 |
| Milford, CT | Connecticut Air Systems, Inc. | C90C752B86 | Apprenticeship Sponsor | Jun 30, 2027 |
| Plainville, CT | Connecticut Airconditioning Sheetmetal Heatin | 2B29FBFF22 | Apprenticeship Sponsor | Jun 30, 2027 |
| Stratford, CT | Connecticut Basement Systems Radon, Inc. | B049983A9D | Apprenticeship Sponsor | Jun 30, 2021 |
| West Hartford, CT | CONNECTICUT BOILER REPAIR AND MANUFACTURING CO INC | 8EF4523F35 | Major Contractor + 1 more | Jun 30, 2027 |
| New Haven, CT | CONNECTICUT CHILDREN'S MUSEUM INC | 867B1EBF7E | Public Charity + 1 more | Jul 31, 2027 |
| Middlebury, CT | Connecticut Combustion Corporation | C2C79999C6 | Apprenticeship Sponsor | Jun 30, 2027 |
| Centerbrook, CT | CONNECTICUT CONTROLS CORP. | 859236121F | Apprenticeship Sponsor | Jun 30, 2011 |
| Bloomfield, CT | Connecticut Cooling & Heating, Inc. | 7863AF3BE4 | Apprenticeship Sponsor | Jun 30, 2024 |
| North Haven, CT | Connecticut Detection & Sound Systems, LLC | 4009635FB5 | Apprenticeship Sponsor | Jun 30, 2019 |
| Meriden, CT | Connecticut Electrical Contracting LLC | 523B398756 | Apprenticeship Sponsor | Jun 30, 2006 |
| Wilton, CT | Connecticut Electrical, Inc. | 139E19326A | Apprenticeship Sponsor | Jun 30, 2014 |
| Westbrook, CT | Connecticut Environment Control, LLC | 8C7507A192 | Apprenticeship Sponsor | Jun 30, 2009 |
| Farmington, CT | Connecticut Fire Equipment | F7B9165859 | Apprenticeship Sponsor | Jun 30, 2026 |
| Dayville, CT | Connecticut General Oil, LLC | 7B3C485BE2 | Apprenticeship Sponsor | Jun 30, 2012 |
| Naugatuck, CT | Connecticut Hydronics, LLC | 2EA66E56AB | Apprenticeship Sponsor | Jun 30, 2026 |
| Branford, CT | CONNECTICUT IRRIGATION LLC | 5E9DB84907 | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Hopkinton, MA | Connecticut Laborers District Council JATC | 705BED62DD | Apprenticeship Sponsor | Jun 30, 2027 |
| Stafford Springs, CT | Connecticut Mechanical Services LLC | 53CC8BB55F | Apprenticeship Sponsor | Jun 30, 2015 |
| New Haven, CT | Connecticut Mental Health Center State of Connecticut | EF7ACBD9E1 | Apprenticeship Sponsor | Jun 30, 2010 |
| Stamford, CT | Connecticut New York Lighting dba Design Lighting by Marks | 4DDB6F62FF | Apprenticeship Sponsor | Jun 30, 2013 |
| Meriden, CT | Connecticut Plumbers & Pipefitters LU 777 JAC | 79C55B5254 | Apprenticeship Sponsor | Jun 30, 2027 |
| Brookfield, CT | Connecticut Plumbing & Heating Company | 755E505BF8 | Apprenticeship Sponsor | Jun 30, 2008 |
| New Fairfield, CT | Connecticut Plumbing, LLC | 531618FF24 | Apprenticeship Sponsor | Jun 30, 2012 |
| Marlborough, CT | CONNECTICUT PROPANE & PETROLEUM | 3728CAB2F9 | Home Heating Fuel Dealer + 1 more | Sep 30, 2027 |
| Oxford, CT | Connecticut Restaurant Service, Inc. | CCFAD1B7D3 | Apprenticeship Sponsor | Jun 30, 2024 |
| Farmington, CT | CONNECTICUT SPRING & STAMPING CORP. | 17B712D645 | Apprenticeship Sponsor | Jun 30, 2027 |
| Wallingford, CT | Connecticut Steel Corporation | BB218D4D1C | Apprenticeship Sponsor | Jun 30, 2006 |
| Stratford, CT | Connecticut Telecommunications Services LLC | A2DF5231E5 | Apprenticeship Sponsor | Jun 30, 2013 |
| Cromwell, CT | CONNECTICUT TEMPERATURE CONTROLS | 21809EAEF9 | Apprenticeship Sponsor | Jun 30, 2027 |
| Bethlehem, CT | Connecticut Wells - Geothermal Services, Inc. | B8EEB678AA | Apprenticeship Sponsor | Jun 30, 2027 |
| Waterford, CT | Connecticut's Current Connection, Inc. | A8A5774E0A | Apprenticeship Sponsor | Jun 30, 2008 |
| Orange, CT | Connection Plumbing & Heating, LLC | C0BCED51B8 | Apprenticeship Sponsor | Jun 30, 2027 |
| Torrington, CT | Connole's Electric, Inc. | 222C88B820 | Apprenticeship Sponsor | Jun 30, 2027 |
| Cheshire, CT | Conntech Products Corporation | F355ABCBD2 | Apprenticeship Sponsor | Jun 30, 2013 |
| Watertown, CT | Conrod Plumbing & Fire Protection, LLC | BF42301C07 | Apprenticeship Sponsor | Jun 30, 2006 |
| Glastonbury, CT | Conroy Electric, LLC | BB86D4289F | Apprenticeship Sponsor | Jun 30, 2011 |
| Norwood, MA | Consolidated Electrical Services | 85705AE647 | Apprenticeship Sponsor | Jun 30, 2019 |
| Moodus, CT | Consolidated Electrical Services, LLC | 65C510279A | Apprenticeship Sponsor | Jun 30, 2027 |
| New Britain, CT | Consolidated School District of New Britain | 16FD42B32D | Apprenticeship Sponsor | Jun 30, 2021 |
| East Hartford, CT | Consolidated Security, LLC | D37A160947 | Apprenticeship Sponsor | Jun 30, 2005 |
| Hartford, CT | Consolidated Services Group | 254E2D4C71 | Apprenticeship Sponsor | Jun 30, 2008 |
| Storrs, CT | Constant Power LLC | 9A6DC75E6A | Apprenticeship Sponsor | Jun 30, 2014 |
| Higganum, CT | Construction Services Group, LLC | 6ED04438E1 | Apprenticeship Sponsor | Jun 30, 2009 |
| Hamden, CT | CONSTRUCTION SERVICES OF BRANFORD LLC CSB COMMUNICATIONS | 8B097ABEB5 | Tv & Radio Dealer + 3 more | Aug 31, 2027 |
| Norwalk, CT | CONTE COMPANY LLC | C2BEF4B2DC | New Home Construction Contractor + 3 more | Mar 31, 2027 |
| Stamford, CT | CONTE PLUMBING AND HEATING LLC | 3EC73993A4 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Bridgeport, CT | Continental Fuel Co., Inc. | B89FC92118 | Apprenticeship Sponsor | Jun 30, 2016 |
| Farmington, CT | Continental Security Systems, Inc. | 5408894EF6 | Apprenticeship Sponsor | Jun 30, 2012 |
| Danbury, CT | Control Electric LLC | 22F69A3A15 | Apprenticeship Sponsor | Jun 30, 2026 |
| West Hartford, CT | Control Systems Inc. | 55169F2033 | Apprenticeship Sponsor | Jun 30, 2011 |
| Norwalk, CT | Control Wizards, Inc. | AB8A8B23B4 | Apprenticeship Sponsor | Jun 30, 2026 |
| Willimantic, CT | Control/Temp | DCAA05A630 | Apprenticeship Sponsor | Jun 30, 2011 |
| Branford, CT | CONTROLLED AIR INC. | 83F4E84618 | Apprenticeship Sponsor | Jun 30, 2027 |
| Stamford, CT | Controlled Temperatures Inc. | 04F7A9C838 | Apprenticeship Sponsor | Jun 30, 2026 |
| Rocky Hill, CT | Convergint Technologies, LLC | CDC681E2AD | Apprenticeship Sponsor | Jun 30, 2026 |
| Old Saybrook, CT | Cool Breeze Heating & Cooling LLC | FA0C932BCC | Apprenticeship Sponsor | Jun 30, 2017 |
| East Granby, CT | Cool Heat Mechanical Inc. | D29A2B9EC1 | Apprenticeship Sponsor | Jun 30, 2027 |
| Griswold, CT | Cool Time Refrigeration Inc. | 6164DA4317 | Apprenticeship Sponsor | Jun 30, 2006 |
| East Hampton, CT | COOLSYS COMMERCIAL & INDUSTRIAL SOLUTIONS, INC. | C8CE1AFD0A | Apprenticeship Sponsor | Jun 30, 2027 |
| Middlefield, CT | Cooper Atkins Corporation | FCEB08D028 | Apprenticeship Sponsor | Jun 30, 2016 |
| Meriden, CT | Copper Valley Heating & Cooling | 118404DE9C | Apprenticeship Sponsor | Jun 30, 2027 |
| East Hartford, CT | Coppinger Plumbing & Heating, LLC | 3550C5AA4F | Apprenticeship Sponsor | Jun 30, 2021 |
| Trumbull, CT | Coppola Electric Corporatation | A4CA109CF0 | Apprenticeship Sponsor | Jun 30, 2015 |
| Orange, CT | Cor Electric, LLC | 339C4B76A9 | Apprenticeship Sponsor | Jun 30, 2027 |
| Willimantic, CT | Corbett HVAC Services, LLC | 30942E8043 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Danbury, CT | Cordeiro Plumbing Company | F2D8F29554 | Apprenticeship Sponsor | Jun 30, 2021 |
| Orange, CT | Cordone and Tonucci Plumbing, Heating & Maintenance Contractors, Inc. | EA588CA85A | Apprenticeship Sponsor | Jun 30, 2027 |
| Southbury, CT | Cordova Plumbing & Heating, LLC | 5B2C49BB14 | Apprenticeship Sponsor | Jun 30, 2027 |
| Stratford, CT | Corica Electric | 52C6C5D1C8 | Apprenticeship Sponsor | Jun 30, 2007 |
| Brookfield, CT | Corna Heating & Cooling | E45D582DA6 | Apprenticeship Sponsor | Jun 30, 2006 |
| Trumbull, CT | Cornell-Electric LLC | 6D37966C36 | Apprenticeship Sponsor | Jun 30, 2007 |
| Wallingford, CT | Cornerstone Barbershop | 02762A7DFB | Apprenticeship Sponsor | Jun 30, 2026 |
| Bristol, CT | Cornerstone Electrical Services, LLC | 7A8B6D6C16 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| East Granby, CT | Cornerstone Electrical Systems, LLC | A3B8A527B4 | Apprenticeship Sponsor | Jun 30, 2022 |
| Terryville, CT | Cornerstone Electrical, LLC | 37ED315AA2 | Apprenticeship Sponsor | Jun 30, 2025 |
| Cornwall Bridge, CT | Cornwall Electric Company, LLC | 109224983F | Apprenticeship Sponsor | Jun 30, 2023 |
| Canaan, CT | Cornwall Plumbing & Heating, LLC | 4B73E563E8 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Brookfield, CT | Corporate Electric SRBA LLC | 2E6F3AA59B | Apprenticeship Sponsor | Jun 30, 2027 |
| Manchester, CT | Correia Excavators Inc. | 1642513BA2 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Glastonbury, CT | Correia Excavators, Inc. | 61C896FDEF | Apprenticeship Sponsor | Jun 30, 2008 |
| New Fairfield, CT | Corrigan Electric LLC | 45430C7902 | Apprenticeship Sponsor | Jun 30, 2014 |
| Old Lyme, CT | Cote & Daughters Electric, Inc. | EB0563182A | Apprenticeship Sponsor | Jun 30, 2007 |
| Willimantic, CT | Cote Electric | 0534BF84EB | Apprenticeship Sponsor | Jun 30, 2008 |
| East Haven, CT | Coughlin Electric | A3027ED7D5 | Apprenticeship Sponsor | Jun 30, 2027 |
| Winsted, CT | Counting The Days Electric, LLC | 49A502179D | Apprenticeship Sponsor | Jun 30, 2020 |
| Sandy Hook, CT | Country Air Heating and Cooling, LLC | 4BC103483D | Apprenticeship Sponsor | Jun 30, 2017 |
| Bristol, CT | Country Gardens of Bristol, Inc. | 289F74ED65 | Apprenticeship Sponsor | Jun 30, 2019 |
| Old Lyme, CT | Country Lawn & Garden Co. | 91C7D9B613 | Apprenticeship Sponsor | Jun 30, 2009 |
| Bridgeport, CT | County Electric Construction Inc. | 23C46B1BC1 | Apprenticeship Sponsor | Jun 30, 2027 |
| Seymour, CT | County Plumbing & Heating, LLC | 5840DE91B4 | Apprenticeship Sponsor | Jun 30, 2004 |
| Berlin, CT | County Wide Mechanical Services, LLC | DA3AC5FAEB | Apprenticeship Sponsor | Jun 30, 2022 |
| Oakville, CT | Coupland Electric Inc. | 2D9DF9A015 | Apprenticeship Sponsor | Jun 30, 2015 |
| Bridgeport, CT | Courtney's Plumbing & Heating, LLC | 6C524A63AE | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Bristol, CT | COUSINS OIL CO INC | 096569AD24 | Home Heating Fuel Dealer + 2 more | Sep 30, 2027 |
| Cromwell, CT | Covenant Building Services, LLC | 65D5FD8288 | Apprenticeship Sponsor | Jun 30, 2008 |
| North Haven, CT | Covidien | 07EAD49788 | Apprenticeship Sponsor | Jun 30, 2020 |
| Waterbury, CT | Coviello Plumbing & Heating, Inc. | 22590D6091 | Apprenticeship Sponsor | Jun 30, 2027 |
| Middlefield, CT | Cowett Plumbing & Well Systems, LLC | CE3C4CA88E | Apprenticeship Sponsor | Jun 30, 2018 |
| Waterbury, CT | Cozy Air, LLC | DB6B4A39A7 | Apprenticeship Sponsor | Jun 30, 2026 |
| Wolcott, CT | CPE Electric, LLC | 7BE6525AF2 | Apprenticeship Sponsor | Jun 30, 2027 |
| Bristol, CT | CPT Electric, LLC | 0F3D142D63 | Apprenticeship Sponsor | Jun 30, 2010 |
| Stamford, CT | Craft Electric, LLC | CC9F83B816 | Apprenticeship Sponsor | Jun 30, 2024 |
| Bridgeport, CT | Craig and Terrys Hari | 3E6434415F | Apprenticeship Sponsor | Jun 30, 2023 |
| Milford, CT | Craig Corey Plumbing & Heating, LLC | 92FA7633AD | Apprenticeship Sponsor | Jun 30, 2020 |
| Northford, CT | CRC Electric | 8E4E1F7FAE | Apprenticeship Sponsor | Jun 30, 2026 |
| Torrington, CT | Creative Electric, LLC | 9CF9574536 | Apprenticeship Sponsor | Jun 30, 2027 |
| New Haven, CT | Creative ME LLC | 2ADA909680 | Apprenticeship Sponsor | Jun 30, 2026 |
| East Windsor, CT | Crespos Hair Lounge | 9671DDC0D5 | Apprenticeship Sponsor | Jun 30, 2027 |
| Hartford, CT | Crest Mechanical Services, Inc. | AC45E35F8E | Apprenticeship Sponsor | Jun 30, 2027 |
| Monroe, CT | Criscione & Cohen, LLC | 8710779F85 | Apprenticeship Sponsor | Jun 30, 2017 |
| Monroe, CT | Criscione Family Electric, Inc. | 319A419B44 | Apprenticeship Sponsor | Jun 30, 2016 |
| Monroe, CT | Criscione, LLC | 2B0AF1E606 | Apprenticeship Sponsor | Jun 30, 2021 |
| South Windsor, CT | Crisp Electric, LLC | 306CFA6833 | Apprenticeship Sponsor | Jun 30, 2014 |
| Thomaston, CT | Crocco Mechanical | 4DA5AC5D40 | Apprenticeship Sponsor | Jun 30, 2027 |
| Cromwell, CT | CROMWELL ENERGY | 4A62AA7472 | Motor Fuel Quality Registration + 2 more | Oct 31, 2026 |
| North Salem, NY | Cronin Electrical Contracting | 90C25802FE | Apprenticeship Sponsor | Jun 30, 2026 |
| Meriden, CT | Crossway Electric, LLC | FD5718FE30 | Apprenticeship Sponsor | Jun 30, 2025 |
| Lowell, MA | Crowe & Sons Electrical Corp. | 1DF6B6B9F7 | Apprenticeship Sponsor | Jun 30, 2006 |
| Meriden, CT | Crowell Heating & Air Conditioning | A13921092B | Apprenticeship Sponsor | Jun 30, 2023 |
| Bristol, CT | CROWN ELECTRIC LLC | 63E3517358 | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Bristol, CT | Crown Oil Co., Inc. | ED13950478 | Apprenticeship Sponsor | Jun 30, 2014 |
| Lebanon, CT | CROWN POINT HEATING AND COOLING, LLC | FD0E2B163F | Apprenticeship Sponsor | Jun 30, 2023 |
| Windsor, CT | Crown Properties, Inc. | EC22985165 | Apprenticeship Sponsor | Jun 30, 2007 |
| East Hampton, CT | Crowthers Electric, LLC | 79EED0BAF8 | Apprenticeship Sponsor | Jun 30, 2027 |
| New Milford, CT | CRS Electric, LLC | 9B074AF075 | Apprenticeship Sponsor | Jun 30, 2011 |
| Hartford, CT | CRT/UAW Local 376 JATC | 74E1D751E4 | Apprenticeship Sponsor | Jun 30, 2007 |
| Milford, CT | Cruz Electric | 4CF2A331EE | Apprenticeship Sponsor | Jun 30, 2011 |
| New Britain, CT | CSDNB | 5A028A59FC | Apprenticeship Sponsor | Jun 30, 2026 |
| Rocky Hill, CT | CSI Contractors | 5B61220F89 | Apprenticeship Sponsor | — |
| Milford, CT | CSS on Demand, LLC | FA5D221C69 | Apprenticeship Sponsor | Jun 30, 2027 |
| Southington, CT | CT Electrical Contractors | B7FF506D43 | Apprenticeship Sponsor | Jun 30, 2027 |
| Southington, CT | CT Electronics Plus | BC5AD99091 | Apprenticeship Sponsor | Jun 30, 2024 |
| Danielson, CT | CT Heat Pros, LLC | 63C71AFD39 | Apprenticeship Sponsor | Jun 30, 2021 |
| Hamden, CT | CT Home Automation, LLC | 745429923D | Apprenticeship Sponsor | Jun 30, 2017 |
| New Britain, CT | CT Precision Inc | 2E72BE87D1 | Apprenticeship Sponsor | Jun 30, 2027 |
| Seymour, CT | CT PRO WATER SERVICES LLC | 5BF8EE1B7A | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Milford, CT | CT Radon and Well Water Solutions, LLC | 90C233D2BD | Apprenticeship Sponsor | Jun 30, 2025 |
| Pawcatuck, CT | CT RENEWABLES LLC | ACBBF66EE9 | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Chester, CT | CT River Electric, LLC | D484AD1711 | Apprenticeship Sponsor | Jun 30, 2015 |
| Terryville, CT | CT Security Service LLC | 55B86897BD | Apprenticeship Sponsor | Jun 30, 2027 |
| Oxford, CT | CT Water Pump, LLC | EF71929F0D | Apprenticeship Sponsor | Jun 30, 2025 |
| New Milford, CT | CTE Electric, LLC | CE278542FE | Apprenticeship Sponsor | Jun 30, 2026 |
| Beacon Falls, CT | CTelectrical.com LLC | 6E0309B8EE | Apprenticeship Sponsor | Jun 30, 2027 |
| Rocky Hill, CT | CTRE LLC dba Prudential Connecticut Realty | 9C7A1A840D | Apprenticeship Sponsor | Jun 30, 2010 |
| New Britain, CT | Cupe Mechanical HVAC, LLC | 89EA898A64 | Apprenticeship Sponsor | Jun 30, 2023 |
| Windsor, CT | CURLEY'S FUEL | 1ACF516A36 | Home Heating Fuel Dealer + 1 more | Sep 30, 2027 |
| Fairfield, CT | Curran & Sons Inc. | 291B972CB6 | Apprenticeship Sponsor | Jun 30, 2012 |
| Bethel, CT | Current Connections Electric, Plumbing & Drain LLC | 6D615DA10D | Apprenticeship Sponsor | Jun 30, 2004 |
| Naugatuck, CT | Current Electrical Systems, LLC | 1A5D22DC7B | Apprenticeship Sponsor | Jun 30, 2010 |
| Plainville, CT | Current Solutions LLC | B63E18A721 | Apprenticeship Sponsor | Jun 30, 2015 |
| Oakdale, CT | Currie's Plumbing, Heating & Cooling, Inc. | 1649D16170 | Apprenticeship Sponsor | Jun 30, 2027 |
| Ansonia, CT | Curtisey Corporation | 0ECE132810 | Apprenticeship Sponsor | Jun 30, 2008 |
| Farmington, CT | Cushman & Wakefield of Connecticut, Inc. | 8027D05289 | Apprenticeship Sponsor | Jun 30, 2018 |
| Bethel, CT | Custodio Electric LLC | 826E407F74 | Apprenticeship Sponsor | Jun 30, 2009 |
| Bridgeport, CT | CUSTOM AIR SYSTEMS INC. | D986414365 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Bristol, CT | Custom Air, Inc. | 3094E1BF19 | Apprenticeship Sponsor | Jun 30, 2007 |
| Manchester, CT | CUSTOM ELECTRIC INC | 4C46206DA6 | Major Contractor + 1 more | Jun 30, 2027 |
| Litchfield, CT | CUSTOM ELECTRICAL SERVICE CORPORATION | 1364A33D82 | Apprenticeship Sponsor | Jun 30, 2026 |
| Waterford, CT | Custom Landscapes, Inc. dba Jordan Brook Co. | C7B9612149 | Apprenticeship Sponsor | Jun 30, 2004 |
| Newington, CT | Custom Mechanical Services | 8A13AD7CBF | Apprenticeship Sponsor | Jun 30, 2011 |
| Norwalk, CT | Custom Phone Inc. | 6D4D27D14D | Apprenticeship Sponsor | Jun 30, 2006 |
| Middletown, CT | Custom Pipe & Drain, Inc. | CFC731C475 | Apprenticeship Sponsor | Jun 30, 2021 |
| Bethany, CT | Custom Sheet Metal, LLC | 11F30B48CA | Apprenticeship Sponsor | Jun 30, 2027 |
| Hamden, CT | Custom Touch Electric Co. LLC | 2DDAFFACC6 | Apprenticeship Sponsor | Jun 30, 2024 |
| Willington, CT | Custom Ventilation | E74A3220BF | Apprenticeship Sponsor | Jun 30, 2027 |
| Glastonbury, CT | Cut Republic | ECAC1B2129 | Apprenticeship Sponsor | Jun 30, 2023 |
| Milford, CT | Cuts, LLC | 5D1B72C486 | Apprenticeship Sponsor | Jun 30, 2026 |
| Monroe, CT | CV ELECTRIC, LLC | BC77934A19 | Apprenticeship Sponsor | Jun 30, 2026 |
| Berlin, CT | CYCLONE HOME SYSTEMS INC. | A2AC293A5A | Apprenticeship Sponsor | Jun 30, 2026 |
| Griswold, CT | Cyr Plumbing and Heating Services Inc | 5B172DCF01 | Apprenticeship Sponsor | Jun 30, 2027 |
| Wolcott, CT | Cyrious Plumbing, LLC | 0D07B727B9 | Apprenticeship Sponsor | Jun 30, 2016 |
| Lyme, CT | CZ Electric, LLC | 15DB0B824C | Apprenticeship Sponsor | Jun 30, 2023 |
| Huntington, CT | D & B Plumbing, LLC | D667240DBC | Apprenticeship Sponsor | Jun 30, 2006 |
| Derby, CT | D & D CONSTRUCTION SERVICES LLC | 494564FE44 | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Somers, CT | D & D Heating & Air Conditioning LLC | FC0FEC53BB | Apprenticeship Sponsor | Jun 30, 2018 |
| Plainville, CT | D & G CONTRACTORS, INC. | 5C891766B8 | Apprenticeship Sponsor | Jun 30, 2027 |
| Cheshire, CT | D & G Electrical Contractors Inc. | 44A927218A | Apprenticeship Sponsor | Jun 30, 2004 |
| Tolland, CT | D & H MECHANICAL SERVICE LLC | B0E694B365 | Apprenticeship Sponsor + 2 more | Jun 30, 2027 |
| Tolland, CT | D & L Excavation Inc. | 9A2B6C6050 | Apprenticeship Sponsor | Jun 30, 2008 |
| Prospect, CT | D & L Tool, Inc. | 6478697A55 | Apprenticeship Sponsor | Jun 30, 2009 |
| Glastonbury, CT | D & M Electric | FF3CBD84B4 | Apprenticeship Sponsor | Jun 30, 2010 |
| Stratford, CT | D & M Manson Brothers Electric Co. Inc. | F52C5EF339 | Apprenticeship Sponsor | Jun 30, 2021 |
| Trumbull, CT | D & R PLUMBING | 00A94CDAE8 | Apprenticeship Sponsor | Jun 30, 2027 |
| Plainville, CT | D & S Precision Turning, LLC | 5077854BE1 | Apprenticeship Sponsor | — |
| Ansonia, CT | D F MCDERMOTT COMPANY LLC | 7BB9DBE425 | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Canterbury, CT | D Mac & Son Plumbing & Heating, LLC. | 65E2C91C31 | Apprenticeship Sponsor | Jun 30, 2021 |
| Bristol, CT | D'Amato Construction Co., Inc. | D1B4CC5A3E | Demolition Contractor + 3 more | Sep 30, 2027 |
| New Fairfield, CT | D'AMICO ELECTRIC INC. | ED8067F59D | Apprenticeship Sponsor | Jun 30, 2027 |
| Stafford Springs, CT | D'Amico Electric, Inc. | 76394599BC | Apprenticeship Sponsor | Jun 30, 2026 |
| Stamford, CT | D'Arinzo Electric & Contracting, LLC | 78A7B39571 | Apprenticeship Sponsor | Jun 30, 2027 |
| Watertown, CT | D. Anchor Electric, LLC | 522A0ECD06 | Apprenticeship Sponsor | Jun 30, 2024 |
| Clinton, CT | D. Beckwith Electric LLC | A5C0FF8CA8 | Apprenticeship Sponsor | Jun 30, 2012 |
| Manchester, CT | D. DUBALDO ELECTRIC CO., LLC | DE40B7DFB7 | Apprenticeship Sponsor | Jun 30, 2027 |
| Stratford, CT | D. Kay Electrical Contractors, LLC | FB30064B26 | Apprenticeship Sponsor | Jun 30, 2027 |
| Stratford, CT | D. Lux & Son Electrical Construction, LLC | B397299071 | Apprenticeship Sponsor | Jun 30, 2005 |
| Woodbury, CT | D. Rose Mechanical, LLC | B674E0FE0F | Apprenticeship Sponsor | Jun 30, 2027 |
| Old Saybrook, CT | D. Roy Electric LLC | 3FE2CEF2FD | Apprenticeship Sponsor | Jun 30, 2018 |
| Stamford, CT | D. Sal Electrical Contractors, Inc. | 2EA3152666 | Apprenticeship Sponsor | Jun 30, 2026 |
| Mystic, CT | D.B. Electric, Inc. | 6A5E51BC05 | Apprenticeship Sponsor | Jun 30, 2027 |
| Marion, CT | D.B. Woolley, Inc. | 71D1EEFD34 | Apprenticeship Sponsor | Jun 30, 2007 |
| North Haven, CT | D.C. Corp including C.E.M., LLC | AC6A633088 | Apprenticeship Sponsor | Jun 30, 2027 |
| Fairfield, CT | D.C. Henry Electrical Contractors, LLC | CF3702490F | Apprenticeship Sponsor | Jun 30, 2027 |
| Manchester, CT | D.C. Holcomb Electric | 2725ABDCDD | Apprenticeship Sponsor | Jun 30, 2007 |
| Newtown, CT | D.D. Electric LLC | 309F8248DA | Apprenticeship Sponsor | Jun 30, 2026 |
| North Branford, CT | D.F.G. Electric Co. Inc. | 7F1D3AC865 | Apprenticeship Sponsor | Jun 30, 2027 |
| Waterford, CT | D.J. McCarthy Plumbing & Heating | 60E4227095 | Apprenticeship Sponsor | Jun 30, 2017 |
| Orange, CT | D.J.D.D. Electrical Construction Co., Inc. | D9FF1286A1 | Apprenticeship Sponsor | Jun 30, 2012 |
| Greenwich, CT | D.J.L. Electric | B75E3AF40B | Apprenticeship Sponsor | Jun 30, 2009 |
| Groton, CT | D.N.L. Refrigeration & Plumbing Services, LLC | 4973BAC481 | Apprenticeship Sponsor | Jun 30, 2010 |
| Plainville, CT | D.R. Templeman Company | C6A1AE7666 | Apprenticeship Sponsor | Jun 30, 2010 |
Alphabetical order — this site ranks no one. Businesses with at least one active credential in the Connecticut eLicensing file of October 1, 2026. How to read this.