Apprenticeship Sponsor — page 1 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 |
|---|---|---|---|---|
| Manchester, CT | "R" Plumbing Company, LLC | A5C1EEE117 | Apprenticeship Sponsor | Jun 30, 2019 |
| Hartford, CT | 1199 New England Training and Upgrading Fund | 8ED591EF1F | Apprenticeship Sponsor | Jun 30, 2024 |
| Middlebury, CT | 1of1 barbering | 605550D66B | Apprenticeship Sponsor | Jun 30, 2026 |
| Legacy, CT | 1st Choice Electrical Services | A90A4949C3 | Apprenticeship Sponsor | Jun 30, 2008 |
| Milfordw, CT | 1st Light Energy, Inc. | 97BC55FCCC | Apprenticeship Sponsor | Jun 30, 2019 |
| Southington, CT | 1st MJ, LLC | E3F13FE734 | Apprenticeship Sponsor | Jun 30, 2019 |
| New Milford, CT | 20/20 AIR MECHANICAL CORP | C3C44FE3A4 | Apprenticeship Sponsor | Jun 30, 2025 |
| Lisbon, CT | 24/6 Electric and Home Improvement | A7DAC38997 | Apprenticeship Sponsor | — |
| New Haven, CT | 360 Degrees Hair Design Unisex Salon | 9C52E6DB4C | Apprenticeship Sponsor | Jun 30, 2023 |
| Watertown, CT | 360 Fades - The Barber Shop | D077CEA098 | Apprenticeship Sponsor | Jun 30, 2023 |
| Hartford, CT | 3C Electric Systems, LLC | 7F4FC9C1BF | Apprenticeship Sponsor | Jun 30, 2027 |
| Berlin, CT | 3D Tech, Inc. | 1D30DB67AF | Apprenticeship Sponsor | Jun 30, 2020 |
| Stafford Springs, CT | 3M Company | 9A379F1B5D | Apprenticeship Sponsor | Jun 30, 2022 |
| Monroe, CT | 4 T's Plumbing and Heating Services, LLC | 01701B53E8 | Apprenticeship Sponsor | Jun 30, 2024 |
| New Haven, CT | 4 U Heating & Cooling Services, LLC | 5DCE657044 | Apprenticeship Sponsor | Jun 30, 2019 |
| Preston, CT | 4-M Plumbing & Heating LLC | 00EF77DFE6 | Apprenticeship Sponsor | Jun 30, 2009 |
| Berlin, CT | 568Systems, Inc. | 6AFC9D0082 | Apprenticeship Sponsor | Jun 30, 2027 |
| Dayville, CT | 860 Plumbing & Heating, LLC | 0DAE882ABA | Apprenticeship Sponsor | Jun 30, 2024 |
| Southington, CT | 9 Lives Barbershop | 62A075C143 | Apprenticeship Sponsor | Jun 30, 2025 |
| Meriden, CT | A & A Electrical Contractors, LLC | 558A076E31 | Apprenticeship Sponsor | Jun 30, 2026 |
| Bethel, CT | A & A Elite Enterprises, LLC | 521F0C414E | Apprenticeship Sponsor | Jun 30, 2010 |
| Milford, CT | A & A Plumbing & Heating, LLC | 618130B468 | Apprenticeship Sponsor | Jun 30, 2016 |
| Seymour, CT | A & B Contracting, LLC | 8682C8FEC5 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| South Windsor, CT | A & B Cooling & Heating Corp. | AEBEE7FF37 | Apprenticeship Sponsor | Jun 30, 2027 |
| Monroe, CT | A & B Mechanical, LLC | 351CDA5E73 | Apprenticeship Sponsor | Jun 30, 2027 |
| Norfolk, CT | A & B Plumbing & Heating, LLC | D98AED1F8E | Apprenticeship Sponsor | Jun 30, 2009 |
| Ansonia, CT | A & B Services of SFC, UC DBA Mr. Rooter of SFC, LLC | 142C42DBA5 | Apprenticeship Sponsor | — |
| Mystic, CT | A & D Electric, Inc. | 55E688D1D4 | Apprenticeship Sponsor | Jun 30, 2006 |
| Canton, MA | A & E Fire Protection, Inc. | CB60AA0B8D | Apprenticeship Sponsor | Jun 30, 2018 |
| East Haven, CT | A & G CONTRACTING INC | 4BF1860CCC | Major Contractor + 3 more | Jun 30, 2027 |
| Westerly, RI | A & L Plumbing Inc. | 5BE4472CE2 | Apprenticeship Sponsor | Jun 30, 2015 |
| Guilford, CT | A & L Refrigeration, LLC | DD50E9FAFE | Apprenticeship Sponsor | Jun 30, 2017 |
| Enfield, CT | A & M Alarms LLC | CEC816E9FE | Apprenticeship Sponsor | Jun 30, 2015 |
| Wethersfield, CT | A & M Electric Co., Inc. | 3B0D34B34A | Apprenticeship Sponsor | Jun 30, 2009 |
| Stamford, CT | A & M Mechanical Systems, Inc. | 9D7E8C7598 | Apprenticeship Sponsor | Jun 30, 2015 |
| New Canaan, CT | A & N Plumbing & Heating, LLC | 4EBEB40437 | Apprenticeship Sponsor | Jun 30, 2027 |
| Bridgeport, CT | A & R Electric, Inc. | 088CB4B187 | Apprenticeship Sponsor | Jun 30, 2027 |
| Glastonbury, CT | A & R Mechanical Services, Inc. | 381DDDA382 | Apprenticeship Sponsor | Jun 30, 2009 |
| Durham, CT | A & S Electrical Services, Inc. | 9DE47198F4 | Apprenticeship Sponsor | Jun 30, 2027 |
| Ansonia, CT | A & S Nathan Heating & Cooling, LLC | D2F778BA1D | Apprenticeship Sponsor | Jun 30, 2027 |
| New Haven, CT | A & T Mechanical Services, LLC | 319E02796B | Apprenticeship Sponsor | Jun 30, 2014 |
| West Haven, Ct, CT | A + Plumbing & Heating, LLC | 50405C1553 | Apprenticeship Sponsor | Jun 30, 2027 |
| Hartford, CT | A and S Home Services, LLC | 1817848AC8 | Apprenticeship Sponsor | Jun 30, 2027 |
| Manchester, CT | A D B CONSTRUCTION & SEPTIC CORP | 5CC0E9EA09 | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Branford, CT | A D F ELECTRIC INC | F00CCE9BB7 | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Westport, CT | A J PENNA & SON | 1644D1F6A3 | Apprenticeship Sponsor | Jun 30, 2016 |
| Bethel, CT | A New Beginning Salon Spa | 980E066B8D | Apprenticeship Sponsor | Jun 30, 2027 |
| West Hartford, CT | A R Torromeo Electric LLC | 1E1B380E78 | Apprenticeship Sponsor | Jun 30, 2019 |
| Branford, CT | A SECONDINO & SON INC | 6031CE50EB | Major Contractor + 4 more | Jun 30, 2027 |
| Bolton, CT | A Touch of Air LLC | EBB44953FC | Apprenticeship Sponsor | Jun 30, 2008 |
| Bolton, CT | A Touch of Air Property Services, LLC | E1BDD4228E | Apprenticeship Sponsor | Jun 30, 2027 |
| East Haven, CT | A&M Moss Plumbing | 3444B8EF3E | Apprenticeship Sponsor | Jun 30, 2007 |
| Watertown, CT | A+ Electrical Contractors, LLC | 7EFB2509D8 | Apprenticeship Sponsor | Jun 30, 2027 |
| Norwalk, CT | A-1 Electric Co., Inc. | DE75E29AAB | Apprenticeship Sponsor | Jun 30, 2013 |
| Bethel, CT | A-1 Electrical Service LLC | 012CC41ADB | Apprenticeship Sponsor | Jun 30, 2010 |
| South Windsor, CT | A-1 GLASS COMPANY, INC. | 3356230829 | Apprenticeship Sponsor | Jun 30, 2027 |
| New Britain, CT | A-1 Machining Co LLC | 18872984A5 | Apprenticeship Sponsor | Jun 30, 2027 |
| Southbury, CT | A-1 SECURITY SYSTEMS | 5A69DCC3B6 | Apprenticeship Sponsor | Jun 30, 2027 |
| Meriden, CT | A-1 SERVICES INC | 302DB37D70 | Major Contractor + 1 more | Jun 30, 2027 |
| Old Greenwich, CT | A-Lectric Service, LLC | 2CA90B78C0 | Apprenticeship Sponsor | Jun 30, 2013 |
| Derby, CT | A-Quick Pick Crane Service, Inc. Operating of Engineers JATC 478 | DCF37E292A | Apprenticeship Sponsor | Jun 30, 2026 |
| Milford, CT | A-RIGHT PLUMBING & SEWER, LLC | BE8EA669B8 | Apprenticeship Sponsor | Jun 30, 2026 |
| Northford, CT | A-Team Plumbing and Drain, LLC | 6424B0C7B0 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Bloomfield, CT | A. Goldstein Sheet Metal Co., Inc. | EBFAAF14D5 | Apprenticeship Sponsor | Jun 30, 2015 |
| Watertown, CT | A. Longo Electric, Inc. | 168790F45C | Apprenticeship Sponsor | Jun 30, 2015 |
| Danielson, CT | A. Reynolds Electric, LLC | 7D6B610037 | Apprenticeship Sponsor | Jun 30, 2027 |
| Stratford, CT | A. T. Kuhar & Sons Inc. | E9BEDC1C82 | Apprenticeship Sponsor | Jun 30, 2014 |
| Bethel, CT | A.A.A. Alarm Engineering, Ltd. | BEA527EB68 | Apprenticeship Sponsor | Jun 30, 2009 |
| Norfolk, CT | A.B. Bazzano Fuels, Inc. | 07DFC82114 | Apprenticeship Sponsor | Jun 30, 2021 |
| Bethany, CT | A.C. Electric LLC | F008E013D9 | Apprenticeship Sponsor | Jun 30, 2027 |
| Milford, CT | A.C. Electrical Professional Services, LLC. | 7B28A628BB | Apprenticeship Sponsor | Jun 30, 2015 |
| Ridgefield, CT | A.C. Electrical Services LLC | 8DCE4878B8 | Apprenticeship Sponsor | Jun 30, 2027 |
| East Windsor, CT | A.C. Mechanical Services, LLC | AA3C891E34 | Apprenticeship Sponsor | Jun 30, 2027 |
| Ellington, CT | A.C.R. ELECTRIC LLC | 341D89B32F | Apprenticeship Sponsor | Jun 30, 2027 |
| Wallingford, CT | A.E. Electric, LLC | D03E897655 | Apprenticeship Sponsor | Jun 30, 2027 |
| Southbury, CT | A.E. Olsen Company, Inc. | A492A19377 | Apprenticeship Sponsor | Jun 30, 2027 |
| Hamden, CT | A.G MECHANICAL LLC | CA900013D4 | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Colchester, CT | A.I. Boerenko Plumbing & Pump, LLC | 4B9B8A197E | Apprenticeship Sponsor | Jun 30, 2027 |
| Monroe, CT | A.J. Peck Electric, LLC | 2BD86C501B | Apprenticeship Sponsor | Jun 30, 2005 |
| Seymour, CT | A.J.R. Mechanical Contractors, Inc. | 0268CFB105 | Apprenticeship Sponsor | Jun 30, 2008 |
| East Hartford, CT | A.L. Fire Protection, LLC | 932A528969 | Apprenticeship Sponsor | Jun 30, 2027 |
| East Granby, CT | A.M.E. Plumbing & Heating, LLC | F1E9DD2918 | Apprenticeship Sponsor | Jun 30, 2027 |
| Meriden, CT | A.N. Giacco, LLC | 0C3293E21F | Apprenticeship Sponsor | Jun 30, 2027 |
| Ridgefield, CT | A.P. Electric Company, Inc. | A2C91F60CE | Apprenticeship Sponsor | Jun 30, 2017 |
| West Haven, CT | A.R. Fonda Mechanical Services, LLC | 479A3EE5A7 | Apprenticeship Sponsor | Jun 30, 2022 |
| Hamden, CT | A.R. Mendillo, Inc. | B6929509B1 | Apprenticeship Sponsor | Jun 30, 2010 |
| Barkhamsted, CT | A.S.E. Electric Company, LLC | AC1E9BF2DD | Apprenticeship Sponsor | Jun 30, 2021 |
| Wallingford, CT | A.S.E. Group, Inc. | C668B98BCF | Apprenticeship Sponsor | Jun 30, 2015 |
| Waterbury, CT | A.S.L. Electric, LLC | CD2020DABE | Apprenticeship Sponsor | Jun 30, 2026 |
| East Hartland, CT | A.T. Precision Plumbing & Heating LLC | C719A7DFD4 | Apprenticeship Sponsor | Jun 30, 2017 |
| Stamford, CT | A.T.C. Electrical & Communication Conts., LLC | E1F193CDA3 | Apprenticeship Sponsor | Jun 30, 2009 |
| Shelton, CT | A.W. Toppin Electrical Service | 5E238F8820 | Apprenticeship Sponsor | Jun 30, 2027 |
| Milford, CT | A/C ELECTRIC SERVICES, LLC | E7916C5287 | Apprenticeship Sponsor | Jun 30, 2027 |
| N Stonington, CT | A/Z CORPORATION | B15D1B2C25 | Major Contractor + 1 more | Jun 30, 2027 |
| Meriden, CT | A1 Quality Rooter | 7E749274DE | Apprenticeship Sponsor | Jun 30, 2027 |
| Preston, CT | AA Affordable Air LLC | C9927CC556 | Apprenticeship Sponsor | Jun 30, 2027 |
| West Hartford, CT | AA Electrical Service, Inc. | ADB2FC28FD | Apprenticeship Sponsor | Jun 30, 2027 |
| Bloomfield, CT | AA GLASS, INC. | 93C85327CC | Apprenticeship Sponsor | Jun 30, 2027 |
| Oxford, CT | AAA Alarm Engineering, LTD | 335A51E18D | Apprenticeship Sponsor | Jun 30, 2026 |
| West Haven, CT | AAA Electrical Services | D0AB537A01 | Apprenticeship Sponsor | Jun 30, 2027 |
| Moodus, CT | AAA Electrician Services, LLC | C2743A0522 | Apprenticeship Sponsor | Jun 30, 2023 |
| Newington, CT | AAA Plumbing LLC | 64F8A0A1E7 | Apprenticeship Sponsor | Jun 30, 2018 |
| Higganum, CT | AAA Plumbing, Heating & Air, LLC | DC4C530154 | Apprenticeship Sponsor | Jun 30, 2008 |
| Plainville, CT | AAA Refrigeration Service Inc. | 9D03DE38D8 | Apprenticeship Sponsor | Jun 30, 2027 |
| Brooklyn, CT | AAMP CONN Contractors, LLC | F007BBAEC7 | Apprenticeship Sponsor | Jun 30, 2014 |
| Andover, CT | AAMP Conn Electrical Contractors, LLC | 0CC447B7DE | Apprenticeship Sponsor | Jun 30, 2017 |
| Waterbury, CT | Aaron Associates of Conn., Inc. | FA71E534F6 | Apprenticeship Sponsor | Jun 30, 2021 |
| Storrs, CT | AB Electric & Security | 815A345E87 | Apprenticeship Sponsor | Jun 30, 2010 |
| Enfield, CT | AB Electric & Security, LLC | 314D430DD2 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Windsor, CT | AB Electric, LLC | AF2E81DCD7 | Apprenticeship Sponsor | Jun 30, 2027 |
| Durham, CT | AB Security Solutions, LLC | B2CADDF6F9 | Apprenticeship Sponsor | Jun 30, 2023 |
| West Hartford, CT | ABA Plumbing & Heating | 5000FCE71D | Apprenticeship Sponsor | Jun 30, 2014 |
| Manchester, CT | ABA-PGT, Inc. | 299F779729 | Apprenticeship Sponsor | Jun 30, 2026 |
| Plainville, CT | ABACUS Heating & Cooling, LLC | 77605D5CAC | Apprenticeship Sponsor | Jun 30, 2013 |
| East Haven, CT | Abate Electric Inc. | 1BE5A35772 | Apprenticeship Sponsor | Jun 30, 2019 |
| North Branford, CT | Abbatello Electric LLC | 2163E4558E | Apprenticeship Sponsor | Jun 30, 2026 |
| Brookfield, CT | ABC Fuel and Service, LLC | 11579BD362 | Apprenticeship Sponsor | Jun 30, 2023 |
| Ansonia, CT | ABC Mechanical LLC | 59CE47DEC9 | Apprenticeship Sponsor | Jun 30, 2005 |
| Meriden, CT | ABE-Electric, LLC | DD087ECAB7 | Apprenticeship Sponsor | Jun 30, 2015 |
| Milford, CT | ABH Plumbing & Heating, LLC | 0E1EC095BA | Apprenticeship Sponsor | Jun 30, 2025 |
| Stamford, CT | Able an ABM Company ATT: James Gebhardt c/o Rubenstein Properties | 9133DE59F5 | Apprenticeship Sponsor | Jun 30, 2027 |
| Southbury, CT | Able Mechanical Services, LLC | 44CA798769 | Apprenticeship Sponsor | Jun 30, 2027 |
| Darien, CT | Able Plumbing Inc. | 4C5AEFAC92 | Apprenticeship Sponsor | Jun 30, 2007 |
| Ledyard, CT | ABS Development | C2966E327F | Apprenticeship Sponsor | Jun 30, 2007 |
| East Windsor, CT | ABS Plumbing & Heating, LLC. | 88254ECE22 | Apprenticeship Sponsor | Jun 30, 2022 |
| Portland, CT | Absolute Air Services, LLC | 7ADB41DD3D | Apprenticeship Sponsor | Jun 30, 2027 |
| Windham, CT | Absolute Alarm Co. of Windham, LLC | 48C291603D | Apprenticeship Sponsor | Jun 30, 2005 |
| Stamford, CT | Absolute Cooling & Heating, LLC | 44F774FD6F | Apprenticeship Sponsor | Jun 30, 2018 |
| Guilford, CT | Absolute Electrical Contractor, LLC | 1B1DB8CFD3 | Apprenticeship Sponsor | Jun 30, 2027 |
| Torrington, CT | ABSOLUTE FIRE SPRINKLERS, LLC | AEE0F51BC4 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Milford, CT | Absolute Home Comfort,LLC | 19E38D2A04 | Apprenticeship Sponsor | Jun 30, 2028 |
| Southington, CT | Absolute Mechanical Systems | 41F0DE169D | Apprenticeship Sponsor | Jun 30, 2020 |
| Trumbull, CT | Absolute Plumbing & Heating LLC | 94E4E97D49 | Apprenticeship Sponsor | Jun 30, 2027 |
| Southbury, CT | AC 2000, Inc. | 02F3D8B91A | Apprenticeship Sponsor | Jun 30, 2027 |
| Norwich, CT | AC&H Services, Inc. | 83BB6C1239 | Apprenticeship Sponsor | Jun 30, 2008 |
| Bozrah, CT | AC/DC Industrial Electric LLC | C15B3F8B02 | Apprenticeship Sponsor | Jun 30, 2027 |
| Watertown, CT | Accelent | 8D6EE1286F | Apprenticeship Sponsor | Jun 30, 2006 |
| Kensington, CT | ACCELERATED ELECTRICAL SERVICES, LLC | 6959A530F8 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Danbury, CT | Accent Electric, LLC | B87C676473 | Apprenticeship Sponsor | Jun 30, 2005 |
| Plainville, CT | Accent Glass & Mirror, LLC | 681C584122 | Apprenticeship Sponsor | Jun 30, 2018 |
| North Haven, CT | Access Air, LLC | 7CC95053B8 | Apprenticeship Sponsor | Jun 30, 2008 |
| West Hartford, CT | Accra-Temp, Inc. | 1A3D4DCDF8 | Apprenticeship Sponsor | Jun 30, 2027 |
| Terryville, CT | Accu-Grind Cutter Service Inc. | F582502866 | Apprenticeship Sponsor | Jun 30, 2027 |
| Tolland, CT | Accu-Rite Tool & Manufacturing Co., Inc. | 89BFBFC3D7 | Apprenticeship Sponsor | Jun 30, 2023 |
| Wilton, CT | Accu-Temp HVAC Inc. | 3F7B12525E | Apprenticeship Sponsor | Jun 30, 2013 |
| Wolcott, CT | Accu-Temp Mechanical Services, Inc. | E40E765DBD | Apprenticeship Sponsor | Jun 30, 2027 |
| Preston, CT | Accurate Door & Window, LLC | 836FF9FC86 | Apprenticeship Sponsor | Jun 30, 2011 |
| Norwich, CT | Accurate Electric LLC | 5F9849F4AF | Apprenticeship Sponsor | Jun 30, 2027 |
| Naugatuck, CT | Accurate Electrical Contractors, LLC | C64BF16876 | Apprenticeship Sponsor | Jun 30, 2026 |
| Southington, CT | Accurate Fire Sprinkler Inspections, LLC | 6B78230889 | Apprenticeship Sponsor | Jun 30, 2020 |
| Stamford, CT | Accurate Lock & Hardware Co., LLC | 484D7993D5 | Apprenticeship Sponsor | Jun 30, 2022 |
| Bristol, CT | Accurate Mechanical, LLC | FF0C855BB4 | Apprenticeship Sponsor | Jun 30, 2022 |
| Deep River, CT | Accurate Oil Burner Service, LLC | 4AE13DF57F | Apprenticeship Sponsor | — |
| Southington, CT | Accurate Security, LLC. | C1FAED4BE8 | Apprenticeship Sponsor | Jun 30, 2015 |
| North Haven, CT | Accuray Mechanical, LLC | 681B5345D2 | Apprenticeship Sponsor | Jun 30, 2027 |
| Fairfield, CT | Accutemp, LLC | 297EAE2391 | Apprenticeship Sponsor | Jun 30, 2007 |
| Danbury, CT | Accutrol, LLC | 1735EF5DD4 | Apprenticeship Sponsor | Jun 30, 2019 |
| Watertown, CT | Ace Electric LLC | F3A991EBE0 | Apprenticeship Sponsor | Jun 30, 2027 |
| Stamford, CT | Ace Electrical Co. | 014E8DAA6F | Apprenticeship Sponsor | Jun 30, 2010 |
| Broadbrook, CT | Ace Energy, LLC D/B/A Taylor Energy | 100C626DDE | Apprenticeship Sponsor | Jun 30, 2027 |
| Preston, CT | Ace Heating LLC | 197FA1C310 | Apprenticeship Sponsor | Jun 30, 2013 |
| Waterbury, CT | Ace Mechanical services plumbing and heating llc | 2F8CC37070 | Apprenticeship Sponsor | Jun 30, 2027 |
| Meriden, CT | Ace Oil Company, LLC | 227B185237 | Apprenticeship Sponsor | Jun 30, 2012 |
| Hamden, CT | Ace Plumbing & Contracting Services, LLC | 1D2B10D3F2 | Apprenticeship Sponsor | Jun 30, 2027 |
| East Hartford, CT | Ace Plumbing & Heating Co. | 745DDA079E | Apprenticeship Sponsor | Jun 30, 2013 |
| Woodbridge, CT | Ace Service Co., Inc. | 5A36C1598E | Apprenticeship Sponsor | Jun 30, 2005 |
| South Windsor, CT | ACE Technologies, Inc. dba: Nutmeg Technologies | C9115BBBA9 | Apprenticeship Sponsor | Jun 30, 2018 |
| Deep River, CT | Acer Gardens Incorporated | 2A9287EE86 | Apprenticeship Sponsor | Jun 30, 2011 |
| Cheshire, CT | Acevedo Electric, LLc | 6F4CAB29E1 | Apprenticeship Sponsor | Jun 30, 2015 |
| Farmington, CT | ACG Construction, LLC | 6A33BA092B | Apprenticeship Sponsor | Jun 30, 2026 |
| Warren, CT | Ackerman Plumbing & Heating, LLC | AB56433113 | Apprenticeship Sponsor | Jun 30, 2018 |
| Coventry, CT | Ackert Electric, LLC. | 71025D9281 | Apprenticeship Sponsor | Jun 30, 2027 |
| Wilton, CT | ACL Electric Services, LLC | 5E69351318 | Apprenticeship Sponsor | Jun 30, 2027 |
| Stamford, CT | Acme Electrical Service LLC | 1DE572DABC | Apprenticeship Sponsor | Jun 30, 2025 |
| New Britain, CT | Acme Monaco Corp. | 7F9D4D8D67 | Apprenticeship Sponsor | Jun 30, 2027 |
| Mystic, CT | Acme Wire Products, Inc. | 01B9C887FB | Apprenticeship Sponsor | Jun 30, 2023 |
| Manchester, CT | ACMT, Inc. | 45C6BA8C8D | Apprenticeship Sponsor | Jun 30, 2014 |
| Danbury, CT | Acorn Electrical Contractors, LLC | 042A2D798D | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Clinton, CT | Acorn-Bernier Electric LLC | 79A77C5425 | Apprenticeship Sponsor | Jun 30, 2027 |
| Baltic, CT | ACP Electrical Contractors | 5E10A98868 | Apprenticeship Sponsor | Jun 30, 2007 |
| Stamford, CT | ACP HEATING & COOLING, LLC | 30819AEBA8 | Apprenticeship Sponsor | Jun 30, 2027 |
| Manchester, CT | ACTION AIR SYSTEMS INC | 8896972CFF | Major Contractor + 1 more | Jun 30, 2027 |
| New Milford, CT | Action Glass Company, Inc. | 5D130F5556 | Apprenticeship Sponsor | Jun 30, 2027 |
| East Windsor, CT | ACTION GLASS LLC | 0F8FD5E05C | Apprenticeship Sponsor | Jun 30, 2027 |
| South Windsor, CT | Adam Electric, LLC | 426A949B59 | Apprenticeship Sponsor | Jun 30, 2023 |
| North Stonington, CT | Adams & Son HVAC | FDDDC8A649 | Apprenticeship Sponsor | Jun 30, 2027 |
| Windsor, CT | Adams Mechanical Contractors, Inc. | FBE62317DE | Apprenticeship Sponsor | Jun 30, 2006 |
| Wallingford, CT | Adaptable Electric. LLC | 077F12F821 | Apprenticeship Sponsor | Jun 30, 2012 |
| Oxford, CT | ADDED COMFORT LLC | 144EAAAAC8 | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Burlington, CT | Addison Cable & Wireless Co., LLC | 6EEE47CDAD | Apprenticeship Sponsor | Jun 30, 2017 |
| Torrington, CT | Addison Electrical Contractors, LLC | 3965E2CBC4 | Apprenticeship Sponsor | Jun 30, 2026 |
| West Haven, CT | Adept Electric, LLC | 5314CBB375 | Apprenticeship Sponsor | Jun 30, 2027 |
| Stamford, CT | ADJ of Stamford, Inc. | FAEC4D80E5 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Shelton, CT | ADK Electric LLC | CB2A5716EB | Apprenticeship Sponsor | Jun 30, 2014 |
| Bethel, CT | Adolf Krueger Company Inc. | DAF4A0841E | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| New Milford, CT | Adonis electric llc | 0E0FC3351B | Apprenticeship Sponsor | Jun 30, 2027 |
| Glastonbury, CT | ADR Security, LLC | F70CE3F0ED | Apprenticeship Sponsor | Jun 30, 2020 |
| Wallingford, CT | ADT & IBEW 90 JATC | 43497F2B4F | Apprenticeship Sponsor | Jun 30, 2027 |
| Old Lyme, CT | ADT Enterprises, Inc. | BCEE94FE51 | Apprenticeship Sponsor | Jun 30, 2008 |
| Brookfield, CT | AdvaCon, LLC | 3634DCAE66 | Apprenticeship Sponsor | Jun 30, 2020 |
| Brooklyn, CT | Advance Electric Controls, LLC | D0A0E6F6D3 | Apprenticeship Sponsor | Jun 30, 2005 |
| Smithfield, RI | Advance Electrical Corporation | 0B50FF6B56 | Apprenticeship Sponsor | Jun 30, 2016 |
| Branford, CT | Advance HVAC | CA364FF82B | Apprenticeship Sponsor | Jun 30, 2027 |
| Newington, CT | Advance Plumbing & Heating, Inc. | 67B69E1D44 | Apprenticeship Sponsor | Jun 30, 2027 |
| Meriden, CT | Advanced Air Technology, LLC | A8A41EA021 | Apprenticeship Sponsor | Jun 30, 2024 |
| Meriden, CT | Advanced Aire Technology | 4BF4AE8B27 | Apprenticeship Sponsor | Jun 30, 2011 |
| North Haven, CT | Advanced Alarms Security Systems | A792A2467D | Apprenticeship Sponsor | Jun 30, 2027 |
| Manchester, CT | Advanced Concepts LLC | EE1E114F2E | Apprenticeship Sponsor | Jun 30, 2023 |
| Guilford, CT | Advanced Electric Company | A7FD334AE5 | Apprenticeship Sponsor | Jun 30, 2009 |
| Cromwell, CT | Advanced Electrical Contractors, Inc. | FB360D1135 | Apprenticeship Sponsor | Jun 30, 2027 |
| Shelton, CT | Advanced Electrical Installation | AFA4B99937 | Apprenticeship Sponsor | Jun 30, 2027 |
| New Milford, CT | Advanced Electrical Services, Inc. | F62F343B20 | Apprenticeship Sponsor | Jun 30, 2020 |
| Bristol, CT | Advanced Electrical Solutions, LLC | 79F4E67EFD | Apprenticeship Sponsor | Jun 30, 2017 |
| Broadbrook, CT | Advanced Electrical Systems, LLC | E65181BF7F | Apprenticeship Sponsor | Jun 30, 2027 |
| Norwalk, CT | Advanced Electronic Systems, LLC | 1DC1454ECA | Apprenticeship Sponsor | Jun 30, 2027 |
| Rocky Hill, CT | Advanced Energy Systems | 37D5079A72 | Apprenticeship Sponsor | Jun 30, 2027 |
| Newtown, CT | Advanced Fusion Systems, LLC | AA8062DD6D | Apprenticeship Sponsor | Jun 30, 2017 |
| South Windsor, CT | Advanced Heating & Air Conditioning, Inc. | 63C0804D83 | Apprenticeship Sponsor | Jun 30, 2017 |
| Shelton, CT | Advanced Home Audio, Inc. | C31E6BE107 | Apprenticeship Sponsor | Jun 30, 2019 |
| Mystic, CT | ADVANCED IMPROVEMENTS LLC | 7A2859A4A9 | New Home Construction Contractor + 4 more | Mar 31, 2027 |
| Farmington, CT | Advanced Mechanical Services, LLC | 9A678C9135 | Apprenticeship Sponsor | Jun 30, 2027 |
| New Haven, CT | Advanced Mechanical Systems | 01BEF679A6 | Apprenticeship Sponsor | Jun 30, 2013 |
| Manchester, CT | Advanced Mold & Manufacturing, Inc. | F8590C37BE | Apprenticeship Sponsor | Jun 30, 2021 |
| Waterbury, CT | Advanced Multi-Cabling Plus, LLC | 855D92D3C1 | Apprenticeship Sponsor | Jun 30, 2027 |
| East Hartford, CT | ADVANCED PERFORMANCE GLASS INC | 8B11FFF9D2 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Southbury, CT | Advanced Plumbing & Heating, LLC | 3D400BBB1D | Apprenticeship Sponsor | Jun 30, 2011 |
| Southington, CT | Advanced Power Systems, LLC | 2FCA61DED0 | Apprenticeship Sponsor | Jun 30, 2009 |
| Waterbury, CT | Advanced Property Systems a division of Real Green, LLC | 2AF2CCCB8D | Apprenticeship Sponsor | Jun 30, 2013 |
| Wallingford, CT | Advanced Protection, LLC | B6AC1543FF | Apprenticeship Sponsor | Jun 30, 2025 |
| Norwalk, CT | ADVANCED ROOTER PLUMBING LLC ADVANCED MECHANICAL & GENERAL CONTRACTORS | 312750510B | Major Contractor + 1 more | Jun 30, 2027 |
| Shelton, CT | ADVANCED SECURITY TECHNOLOGIES, INC. | 06F22FC499 | Apprenticeship Sponsor | Jun 30, 2027 |
| Middlefield, CT | Advanced Sheetmetal Associates, LLC | 5BE2422F09 | Apprenticeship Sponsor | Jun 30, 2027 |
| Middlefield, CT | Advanced Sheetmetal Contractors, Inc. | 0FD2A9B9F0 | Apprenticeship Sponsor | Jun 30, 2021 |
| Waterbury, CT | Advanced Video Security, LLC | B18052D355 | Apprenticeship Sponsor | Jun 30, 2027 |
| Wolcott, CT | ADVANCED WATER SYSTEMS INC | 18AF58B02A | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Stratford, CT | Advantage Electrical LLC | 534B87B4C0 | Apprenticeship Sponsor | Jun 30, 2024 |
| Danbury, CT | Advantage Electrical Services, Inc. | 7808C6584B | Apprenticeship Sponsor | Jun 30, 2026 |
| Branford, CT | Aegis Electrical Systems, LLC | 3B06EBA974 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Shelton, CT | Aerial Lighting & Electric, Inc. | E0546EE16B | Apprenticeship Sponsor | Jun 30, 2027 |
| Meriden, CT | Aeroswiss, LLC | 65E80BEF4A | Apprenticeship Sponsor | Jun 30, 2026 |
| Norwich, CT | AES American Electrical Services | 5DD4AA5ECC | Apprenticeship Sponsor | Jun 30, 2004 |
| Watertown, CT | AFAB, LLC | 64A3C43885 | Apprenticeship Sponsor | Jun 30, 2019 |
| Stratford, CT | AFB Plumbing & Heating, LLC | ED7A3BB6CB | Apprenticeship Sponsor | Jun 30, 2027 |
| Cromwell, CT | AFC Electric, LLC | 85C2491A42 | Apprenticeship Sponsor | Jun 30, 2017 |
| Waterbury, CT | Affordable Burner Service, Inc. dba Best Oil | D08AB6828D | Apprenticeship Sponsor | Jun 30, 2016 |
| Columbia, CT | Affordable Electrical Services, LLC | 09261AF95F | Apprenticeship Sponsor | Jun 30, 2010 |
| Pawcatuck, CT | Affordable Heating & Cooling | E185A1D56E | Apprenticeship Sponsor | Jun 30, 2007 |
| Bristol, CT | Affordable Mechanical Services, Inc. | 8909BE7AC3 | Apprenticeship Sponsor | Jun 30, 2012 |
| Waterbury, CT | Affordable Plumbing LLC | 585241A486 | Apprenticeship Sponsor | Jun 30, 2010 |
| Scotland, CT | Affordable Plumbing Repair LLC | 02D56427AA | Apprenticeship Sponsor | Jun 30, 2004 |
| Bantam, CT | Affordable Pump & Water Conditioning, LLC | D4FAE14336 | Apprenticeship Sponsor | Jun 30, 2011 |
| Bantam, CT | Affordable Water Systems, Inc. | C4DE4C358C | Apprenticeship Sponsor | Jun 30, 2024 |
| Mansfield Center, CT | Affordable Water Treatment LLC | E34A1CDDAF | Apprenticeship Sponsor | Jun 30, 2018 |
| Southington, CT | AFS Fire Protection, Inc. | 6D97E3162C | Apprenticeship Sponsor | Jun 30, 2024 |
| Meriden, CT | AGC Incorporated | D8B979DA23 | Apprenticeship Sponsor | Jun 30, 2005 |
| Colchester, CT | AGS HVAC Services LLC | 9E50649FE5 | Apprenticeship Sponsor | Jun 30, 2023 |
| Old Saybrook, CT | Aim Electric Company, Inc. | 656D4343E2 | Apprenticeship Sponsor | Jun 30, 2007 |
| Trumbull, CT | Air Associates, LLC | 6C7B618AF8 | Apprenticeship Sponsor | Jun 30, 2020 |
| Wallingford, CT | Air Comfort Systems Inc. | D9ADB49AD4 | Apprenticeship Sponsor | Jun 30, 2024 |
| Plainville, CT | Air Connections, LLC | 2FCFA0F3F8 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Ellington, CT | Air Control Mechanical LLC | D41E7A991E | Apprenticeship Sponsor | Jun 30, 2027 |
| Danbury, CT | Air Crafters, L.L.C. | 02B739A774 | Apprenticeship Sponsor | Jun 30, 2008 |
| Wolcott, CT | Air CT | 59EA515E21 | Apprenticeship Sponsor | Jun 30, 2026 |
| Guilford, CT | Air Dynamics Heating & Cooling, Inc. | 5123A81ED1 | Apprenticeship Sponsor | Jun 30, 2026 |
| Fairfield, CT | Air Dynamics, LLC | 7839FB2A11 | Apprenticeship Sponsor | Jun 30, 2026 |
| Colchester, CT | AIR FLO MECHANICAL | B66399113E | Apprenticeship Sponsor | Jun 30, 2027 |
| Branford, CT | Air Inc. Heating & Air Conditioning | 33911E6ADE | Apprenticeship Sponsor | Jun 30, 2027 |
| Old Saybrook, CT | Air On Time, LLC | 3677A837F2 | Apprenticeship Sponsor | Jun 30, 2027 |
| Sherman, CT | Air One Systems, LLC | A15AA0768D | Apprenticeship Sponsor | Jun 30, 2027 |
| Milford, CT | Air Perfect, Inc. | 36C86DE76A | Apprenticeship Sponsor | Jun 30, 2014 |
| Norwalk, CT | Air Plus, Inc. | 875BD74346 | Apprenticeship Sponsor | Jun 30, 2026 |
| North Salem, NY | Air Professional Associates, LLC | 1D099A75AE | Apprenticeship Sponsor | Jun 30, 2025 |
| Yantic, CT | Air Quality Mechanical Services, LLC | BE1BF1ECBD | Apprenticeship Sponsor | Jun 30, 2015 |
| Stamford, CT | AIR SOLUTIONS INC | 196A258E75 | Apprenticeship Sponsor | Jun 30, 2027 |
| Danbury, CT | Air Specialist, Inc. | 1B7CBF61DD | Apprenticeship Sponsor | Jun 30, 2015 |
| West Haven, CT | Air Specialties Heating & AC Incorporated | 71BF219777 | Apprenticeship Sponsor | Jun 30, 2027 |
| Glastonbury, CT | Air Spin Mechanical LLC | 01482504A3 | Apprenticeship Sponsor | Jun 30, 2027 |
| Berlin, CT | AIR TEMP MECHANICAL SERVICES INC | 1817E44990 | Major Contractor + 1 more | Jun 30, 2027 |
| Wolcott, CT | Air Temperature Heating & Cooling LLC | 605248F5D1 | Apprenticeship Sponsor | Jun 30, 2012 |
| Wallingford, CT | Air Unlimited, LLC | B00D26027A | Apprenticeship Sponsor | Jun 30, 2022 |
| North Franklin, CT | Air We Are Heating & Cooling, LLC | 4E5260EBDA | Apprenticeship Sponsor | Jun 30, 2017 |
| Middletown, CT | Air-Care, Inc. | 8FC41A4B38 | Apprenticeship Sponsor | Jun 30, 2007 |
| Ansonia, CT | Aire Serv Heating and Air Conditioning | C7368C8EF9 | Apprenticeship Sponsor | Jun 30, 2027 |
| Portland, CT | Airex Rubber Products Corp. | 5AB9C2D2CC | Apprenticeship Sponsor | Jun 30, 2027 |
| Fairfield, CT | Aireze Heating & Cooling, LLC | C2BB84CDB0 | Apprenticeship Sponsor | Jun 30, 2023 |
| Shelton, CT | Airplus Heating & Cooling, LLC | DF15FB5DCF | Apprenticeship Sponsor | Jun 30, 2027 |
| Stamford, CT | Airtech | B754C687F0 | Apprenticeship Sponsor | Jun 30, 2009 |
| East Granby, CT | Airway Electric Company | 50D5E74920 | Apprenticeship Sponsor | Jun 30, 2011 |
| Wolcott, CT | AJC Electric, LLC | 771CFCDBD2 | Apprenticeship Sponsor | Jun 30, 2015 |
| Stamford, CT | AJI Electrical Service Inc. | 091F65E0BC | Apprenticeship Sponsor | Jun 30, 2012 |
| Tolland, CT | AJP Electric LLC | 3D55ECE7D1 | Apprenticeship Sponsor | Jun 30, 2026 |
| Milford, CT | AJR PLUMBING SERVICE DBA ALAN RUANE PLUMBING SERVICES | 4838A1B7CA | Apprenticeship Sponsor | Jun 30, 2027 |
| Windham, CT | AJs Plumbing Services, LLC | F5931295B7 | Apprenticeship Sponsor | Jun 30, 2027 |
| Hartford, CT | ak mechanical contractors llc | 1E7BA880A9 | Apprenticeship Sponsor | Jun 30, 2026 |
| Bloomfield, CT | AKT Plumbing, LLC | 9F0D1654B6 | Apprenticeship Sponsor | Jun 30, 2018 |
| Norwalk, CT | Al Geregetano Electric | 6340E585A4 | Apprenticeship Sponsor | Jun 30, 2007 |
| Clinton, CT | Al's Affordable Plumbing, Inc. | 60B37ACCFF | Apprenticeship Sponsor | Jun 30, 2026 |
| Naugatuck, CT | Al's Electric | 10D8AE1A7E | Apprenticeship Sponsor | Jun 30, 2007 |
| Orange, CT | Al's Plumbing and Heating, LLC | B783AEA5A9 | Apprenticeship Sponsor | Jun 30, 2027 |
| Shelton, CT | Al's Plumbing LLC | E310043337 | Apprenticeship Sponsor | Jun 30, 2017 |
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.