Apprenticeship Sponsor — page 2 of 20
5,826 businesses with an active “Apprenticeship Sponsor” credential — administered by the Department of Labor. State file of October 1, 2026.
1 · 2 · 3 · 4 · 5 · 6 · 7 · 8 · 9 · 10 · 11 · 12 · 13 · 14 · 15 · 16 · 17 · 18 · 19 · 20
| Place | Business | Record | Credentials | Latest expiration |
|---|---|---|---|---|
| Manchester, CT | Alarm Contractors, Inc. | 675CA0EE03 | Apprenticeship Sponsor | Jun 30, 2015 |
| Norwich, CT | Alarm Design LLC | C69829E3F8 | Apprenticeship Sponsor | Jun 30, 2014 |
| Torrington, CT | Alarm Guyss LLC | 7ABE974889 | Apprenticeship Sponsor | Jun 30, 2011 |
| Danbury, CT | Alarm King Inc. | 137F943202 | Apprenticeship Sponsor | Jun 30, 2027 |
| Milford, CT | Alarm Security & Communications, LLC | FC263BE3EC | Apprenticeship Sponsor | Jun 30, 2007 |
| Waterford, CT | Alarm Security Protection Company, Inc. | 3A0AFE7760 | Apprenticeship Sponsor | Jun 30, 2022 |
| Clinton, CT | Alarm Systems, LLC | 0AC628424F | Apprenticeship Sponsor | Jun 30, 2024 |
| North Stonington, CT | Alarming Ideas | 504B89FDCB | Apprenticeship Sponsor | Jun 30, 2025 |
| Monroe, CT | ALARMS BY PRECISION, LLC | 4F4A628CE6 | Apprenticeship Sponsor | Jun 30, 2025 |
| Stamford, CT | Alberino Electric | B85DFEDFAE | Apprenticeship Sponsor | Jun 30, 2025 |
| Waterbury, CT | Albert Dumont Plumbing & Heating | 3D6555EF2A | Apprenticeship Sponsor | Jun 30, 2016 |
| Milford, CT | Albert Munroe Plumbing & Heating, Inc. | 84EFCF5201 | Apprenticeship Sponsor | Jun 30, 2026 |
| Old Saybrook, CT | Albert Philopena, Inc. | B700F3D9DE | Apprenticeship Sponsor | Jun 30, 2004 |
| Southington, CT | Albert's Dependable Plumbing, Inc. | 29BA899A0D | Apprenticeship Sponsor | Jun 30, 2008 |
| Northford, CT | Albino Electric LLC | 1294A6C973 | Apprenticeship Sponsor | Jun 30, 2008 |
| Brookfield, CT | ALCAIDE INC | 76A645CFD5 | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Wolcott, CT | Alden Corporation | AFF29B36FA | Apprenticeship Sponsor | Jun 30, 2014 |
| Norwalk, CT | Alejandra's Salon and Barber Shop, LLC | 4E2B367B0D | Apprenticeship Sponsor | Jun 30, 2026 |
| East Hartford, CT | Alert Scientific Inc. | 2709515405 | Apprenticeship Sponsor | Jun 30, 2027 |
| New Haven, CT | Alert Security Systems, Inc. | 6955049C8C | Apprenticeship Sponsor | Jun 30, 2021 |
| Stamford, CT | ALERT SYSTEMS LLC DBA - SECURITY SPECIALISTS | C086AC66E0 | Apprenticeship Sponsor | Jun 30, 2026 |
| Danbury, CT | Aletto Electric, LLC | 1B85858F75 | Apprenticeship Sponsor | Jun 30, 2026 |
| Somers, CT | Alexander Sheetmetal & Mechanical, LLC | CE03E58EE2 | Apprenticeship Sponsor | Jun 30, 2006 |
| Stamford, CT | Alfa Team Electrical Contractors, LLC | 80CF0C8167 | Apprenticeship Sponsor | Jun 30, 2014 |
| Waterbury, CT | Alfro Custom Manufacturing Co. | FFD3C409DF | Apprenticeship Sponsor | Jun 30, 2004 |
| Bridgeport, CT | ALICEA ELECTRICAL CONTRACTORS LLC | 469832D35C | Apprenticeship Sponsor | Jun 30, 2026 |
| Orange, CT | Alicki Enterprise Heat and Cool | CDB61DD83A | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Milford, CT | Alicki Enterprise LLC | A3FF6D954A | Apprenticeship Sponsor | Jun 30, 2018 |
| Milford, CT | ALINABAL, INC. | 8473DF5180 | Apprenticeship Sponsor | Jun 30, 2027 |
| Norwalk, CT | ALL ABOUT KIDS OF NORWALK | 056CEF1EC8 | Child Care Center + 1 more | Aug 31, 2028 |
| Wolcott, CT | All American Heating & Air Conditioning Inc. | 374413FF35 | Apprenticeship Sponsor | Jun 30, 2027 |
| Wallingford, CT | All American Irrigation Services, LLC | BAA06F124E | Apprenticeship Sponsor | Jun 30, 2021 |
| Wallingford, CT | All American Plumbing Services, LLC | E5102B3156 | Apprenticeship Sponsor | Jun 30, 2027 |
| New Milford, CT | All Around Mechanical Services, Inc. | A70D679483 | Apprenticeship Sponsor | Jun 30, 2027 |
| Newington, CT | All Bright Electric, LLC | 5A848EF754 | Apprenticeship Sponsor | Jun 30, 2006 |
| Watertown, CT | All Business Associates, LLC | C55C5B59EE | Apprenticeship Sponsor | Jun 30, 2013 |
| Burlington, MA | All Clear Plumbing, Inc. dba Elge Plumbing & Heating Co. | 8802C1C415 | Apprenticeship Sponsor | Jun 30, 2025 |
| Stamford, CT | All County Plumbing and Heating LLC | 56B125DD97 | Apprenticeship Sponsor | Jun 30, 2009 |
| Oxford, CT | All Current Electric, LLC | BF1C8F953E | Apprenticeship Sponsor | Jun 30, 2026 |
| Guilford, CT | All Currents Electric, LLC | 14DE335242 | Apprenticeship Sponsor | Jun 30, 2027 |
| New Haven, CT | All Electric Co., Inc. | 1C245F5196 | Apprenticeship Sponsor | Jun 30, 2006 |
| East Granby, CT | All Electrical and Telecom, LLC | FF6351F893 | Apprenticeship Sponsor | Jun 30, 2026 |
| Hartford, CT | ALL GAS & EQUIPMENT CO | 304B994894 | Home Heating Fuel Dealer + 1 more | Sep 30, 2027 |
| Bristol, CT | All Green It, LLC | 0E13A0BE20 | Apprenticeship Sponsor | Jun 30, 2020 |
| South Windsor, CT | All Light Electrical, LLC | C85234CF7B | Apprenticeship Sponsor | Jun 30, 2020 |
| Stamford, CT | All of Us Air, LLC | 0B75FE4221 | Apprenticeship Sponsor | Jun 30, 2011 |
| Moodus, CT | All Phase Heating & Cooling Contractors, LLC | CAC4190C7A | Apprenticeship Sponsor | Jun 30, 2016 |
| Milford, CT | ALL PHASE HEATING & COOLING, LLC | 4FEB206D1C | Apprenticeship Sponsor | Jun 30, 2026 |
| Andover, CT | All Plumbing & Heating, LLC | 0744D24312 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Tolland, CT | All Plumbing Repair, Inc. | F2DCD2DEDC | Apprenticeship Sponsor | Jun 30, 2018 |
| Meriden, CT | All Pro Electrical Services, LLC | BE8344A0D4 | Apprenticeship Sponsor | Jun 30, 2026 |
| Beacon Falls, CT | All Pro HVAC, LLC | 6F51F92735 | Apprenticeship Sponsor | Jun 30, 2027 |
| Hartford, CT | All Pro Solutions, LLC | C2FEC0CCB0 | Apprenticeship Sponsor | Jun 30, 2014 |
| Manchester, CT | All Seasons Mechanical Services, Inc. | 725619C5FC | Apprenticeship Sponsor | Jun 30, 2027 |
| New Milford, CT | All Service, LLC | A3A493F8CB | Apprenticeship Sponsor | Jun 30, 2010 |
| Cheshire, CT | All Star Electric, LLC | 96CDA4ABEA | Apprenticeship Sponsor | Jun 30, 2020 |
| Farmington, CT | ALL STATE CONSTRUCTION INC | B5110B6C8F | Major Contractor + 1 more | Jun 30, 2027 |
| Danbury, CT | All State Plumbing Pro's, LLC | CD681A7BD1 | Apprenticeship Sponsor | Jun 30, 2027 |
| Rocky Hill, CT | All Systems Electric LLC | 7DE31769E4 | Apprenticeship Sponsor | Jun 30, 2022 |
| South Windsor, CT | All Temp Heating & Cooling, LLC | 43D8B22D67 | Apprenticeship Sponsor | Jun 30, 2011 |
| Berlin, CT | All Town Plumbing & HVAC | E4A91D9099 | Apprenticeship Sponsor | Jun 30, 2025 |
| Waterbury, CT | ALL TRADE INDUSTRIES LLC | D07158FDBD | New Home Construction Contractor + 2 more | Mar 31, 2027 |
| West Haven, CT | All-Brite Electric, Inc. | C4A3F47332 | Apprenticeship Sponsor | Jun 30, 2027 |
| Colchester, CT | All-Star Plumbing, Heating, Cooling & Home Improvement, Inc. | A63D99B459 | Apprenticeship Sponsor | Jun 30, 2025 |
| Brooklyn, CT | All-Tech Plumbing & Heating, LLC | EBC61BDC7D | Apprenticeship Sponsor | Jun 30, 2027 |
| Danbury, CT | All-Ways Secure, LLC | 3B37B9ED24 | Apprenticeship Sponsor | Jun 30, 2010 |
| Bristol, CT | All-Weather Mechanical | 5AE030669A | Apprenticeship Sponsor | Jun 30, 2023 |
| Waterbury, CT | Allan's Barber Shop | 3FE231405F | Apprenticeship Sponsor | Jun 30, 2025 |
| Middletown, CT | Allegion Access Technologies, LLC | FB8863F147 | Apprenticeship Sponsor | Jun 30, 2024 |
| Canton, CT | Allen Thomas Electric, LLC | 876937AA79 | Apprenticeship Sponsor | Jun 30, 2027 |
| Hartford, CT | Allgas | 9EC44FE1D3 | Apprenticeship Sponsor | Jun 30, 2026 |
| Thomaston, CT | Alliance All Trades, LLC | 41285FF65B | Apprenticeship Sponsor | Jun 30, 2022 |
| Prospect, CT | Alliance Electrical Contractors, LLC | 1D0DD43AE7 | Apprenticeship Sponsor | Jun 30, 2007 |
| Oxford, CT | Alliance Energy Solutions | AC3040D3CE | Apprenticeship Sponsor | Jun 30, 2010 |
| Bridgeport, CT | Alliance Heating & Air Conditioning | F04CB0E6CF | Apprenticeship Sponsor | Jun 30, 2027 |
| Andover, CT | Allied Electrical Contractors, LLC | 9EF801D543 | Apprenticeship Sponsor | Jun 30, 2017 |
| Cranston, RI | Allied Industrial Group Inc. | B7C165E9E0 | Apprenticeship Sponsor | Jun 30, 2022 |
| Wallingford, CT | Allied Mechanical Services/HB Refrigeration | 3360EFD1F2 | Apprenticeship Sponsor | Jun 30, 2027 |
| Wallingford, CT | Allied Precision Components | 97D0D7093D | Apprenticeship Sponsor | Jun 30, 2027 |
| Manchester, CT | Allied Printing Services | 92622B8BAB | Apprenticeship Sponsor | Jun 30, 2027 |
| Vernon, CT | ALLSTARS ELECTRICAL, LLC | AD229068FA | Apprenticeship Sponsor | Jun 30, 2027 |
| Plainville, CT | Allstate Alarm Services Plus, LLC | E4BD48DC2D | Apprenticeship Sponsor | Jun 30, 2017 |
| Plainville, CT | Allstate Fire Equipment Inc. | C35D7EDD37 | Apprenticeship Sponsor | Jun 30, 2025 |
| Wallingford, CT | Allstate Fire Equipment of Southern CT LLC | B27F512A88 | Apprenticeship Sponsor | Jun 30, 2027 |
| Yonkers, NY | Allstate Plumbing & Heating Corp. | 8B649DB9D5 | Apprenticeship Sponsor | Jun 30, 2025 |
| New Haven, CT | Almonte Heating and Colling llc | 93A3D63CD9 | Apprenticeship Sponsor | Jun 30, 2026 |
| Shelton, CT | Alpha SSC Disability Services, LLC | 9D96E2236A | Apprenticeship Sponsor | Jun 30, 2012 |
| Norwalk, CT | Alpha Air Systemsm Inc. | 07B3F2A8FD | Apprenticeship Sponsor | Jun 30, 2023 |
| Watertown, CT | Alpha Electric Inc. | 02B19DFBE3 | Apprenticeship Sponsor | Jun 30, 2024 |
| Ellington, CT | Alpha Heating LLC | 0CEEC53A08 | Apprenticeship Sponsor | Jun 30, 2014 |
| Colchester, CT | Alpha Q. Inc. | C79BCA682F | Apprenticeship Sponsor | Jun 30, 2021 |
| Meriden, CT | Alpha Services, LLC | 83A802DF14 | Apprenticeship Sponsor | Jun 30, 2004 |
| Lebanon, CT | Alpha Sun Energy, LLC | 4424323A43 | Apprenticeship Sponsor | Jun 30, 2013 |
| Fairfield, CT | Alpine Heating Service of Fairfield | FC6C1948E8 | Apprenticeship Sponsor | Jun 30, 2008 |
| Coventry, CT | Alpine Mechanical Services | B65080D8B4 | Apprenticeship Sponsor | Jun 30, 2025 |
| Orange, CT | ALS plumbing and heating | 10359CFE4E | Apprenticeship Sponsor | Jun 30, 2026 |
| Windsor, CT | Alstom Power Inc. | 8B39BCCA04 | Apprenticeship Sponsor | Jun 30, 2009 |
| Newington, CT | Alta Property Group, LLC | CDE8B45096 | Apprenticeship Sponsor | Jun 30, 2022 |
| Rocky Hill, CT | Alternative Mechanical Services LLC | 016A15390A | Apprenticeship Sponsor | Jun 30, 2018 |
| Kensington, CT | Alternative Plumbing Solutions | D75A390A38 | Apprenticeship Sponsor | Jun 30, 2026 |
| Plainville, CT | Alto Products Corp. | 5412F82A2C | Apprenticeship Sponsor | Jun 30, 2015 |
| Glastonbury, CT | ALVINS PLUMBING AND HEATING LLC | B6F98A576A | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Preston, CT | Always There, LLC | 313DBB578B | Apprenticeship Sponsor | Jun 30, 2027 |
| Plainville, CT | AM Communications & Security, LLC | 8FD021B3C1 | Apprenticeship Sponsor | Jun 30, 2024 |
| Danbury, CT | AM Electric | FE431E06BB | Apprenticeship Sponsor | Jun 30, 2018 |
| Old Lyme, CT | AM Grimaldi Heating | 1F624BD7DE | Apprenticeship Sponsor | Jun 30, 2014 |
| Niantic, CT | AM SOLUTIONS LLC | 783C8AED48 | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Norwalk, CT | AM STAR ELECTRIC LLC | 9DB8FA4DE2 | Apprenticeship Sponsor | Jun 30, 2027 |
| Cheshire, CT | Amano McGann Inc. | C18B4D0261 | Apprenticeship Sponsor | Jun 30, 2027 |
| Wallingford, CT | Amano USA, Inc. | B74064A704 | Apprenticeship Sponsor | Jun 30, 2010 |
| Groton, CT | Amentum | EDD3E92AF7 | Apprenticeship Sponsor | Jun 30, 2027 |
| Hamden, CT | America Alarm Company, LLC | 62584F381F | Apprenticeship Sponsor | Jun 30, 2014 |
| Wallingford, CT | AMERICAN ALARM & COMMUNICATIONS | 5778C0D30F | Apprenticeship Sponsor | Jun 30, 2024 |
| Vernon, CT | American Barber Company | 3D586F0E85 | Apprenticeship Sponsor | Jun 30, 2024 |
| East Hartford, CT | American Eagle Federal Credit Union | 10BCE717A5 | Apprenticeship Sponsor | Jun 30, 2008 |
| Bristol, Ct, CT | American Fire Protection LLC | 1B2182F4EB | Apprenticeship Sponsor | Jun 30, 2027 |
| Coventry, CT | AMERICAN FUEL OIL CO INC | 6A70BEF13B | Motor Fuel Quality Registration + 2 more | Oct 31, 2026 |
| Voluntown, CT | American Heating & Cooling LLC | 80E48C1F1B | Apprenticeship Sponsor | Jun 30, 2027 |
| Waterbury, CT | American Heating Service LLC | C968793E45 | Apprenticeship Sponsor | Jun 30, 2024 |
| Wallingford, CT | American Industrial Services, Inc. | 681BCB20E2 | Apprenticeship Sponsor | Jun 30, 2027 |
| Ridgefield, CT | American Irrigation Systems, Inc. | 8B1EAE0C8C | Apprenticeship Sponsor | Jun 30, 2026 |
| Bridgeport, CT | American Leak Detection, Inc. | CF08D871A1 | Apprenticeship Sponsor | Jun 30, 2027 |
| Terryville, CT | American Modular Corp. LLC | EBDB6DC5AC | Apprenticeship Sponsor | Jun 30, 2008 |
| New Britain, CT | American Networks International LLC | 33F97876EF | Apprenticeship Sponsor | Jun 30, 2015 |
| Walden, NY | AMERICAN PETROLEUM EQUIPMENT & CONST. CO | 95B99D8D13 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Middletown, CT | American Piping of Connecticut | 9EFBF40DC8 | Apprenticeship Sponsor | Jun 30, 2021 |
| Norwalk, CT | American Quality Plumbing & Heating, LLC | 927944FFEB | Apprenticeship Sponsor | Jun 30, 2011 |
| Northford, CT | American Radiant Services, LLC | 43E5154C87 | Apprenticeship Sponsor | Jun 30, 2023 |
| Farmington, CT | American Red Cross | A25BF03C2D | Apprenticeship Sponsor | Jun 30, 2015 |
| Wallingford, CT | American Refrigeration Company, Inc. | A62690A381 | Apprenticeship Sponsor | Jun 30, 2011 |
| Watertown, CT | American Rooter | 66D39E3035 | Apprenticeship Sponsor | Jun 30, 2027 |
| Orange, CT | AMERICAN SEAL AND ENGINEERING CO., INC. | 696F07BC63 | Apprenticeship Sponsor | Jun 30, 2027 |
| Plymouth, CT | AMERICAN SECURITY & SOUND, LLC. | 12D8991152 | Apprenticeship Sponsor | Jun 30, 2026 |
| Waterbury, CT | AMETEK HAYDON KERK PITTMAN | 230E5A5568 | Apprenticeship Sponsor | Jun 30, 2027 |
| Bridgeport, CT | AMETRIC ROOFING & SOLAR | 262A351B08 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| New Haven, CT | AMG Plumbing Mechanical LLC | D9CBA9FF4B | Apprenticeship Sponsor | Jun 30, 2026 |
| Stamford, CT | Amnet Systems LLC | 6344B9C351 | Apprenticeship Sponsor | Jun 30, 2023 |
| West Haven, CT | Amodio and Sons, Inc. | DDAC83ED07 | Apprenticeship Sponsor | Jun 30, 2027 |
| New Milford, CT | Amorando Ferrito Inc. | DCB7DF7FF9 | Apprenticeship Sponsor | Jun 30, 2009 |
| New Milford, CT | AMP Electric LLC | 73E6D2BD71 | Apprenticeship Sponsor | Jun 30, 2027 |
| West Springfield, MA | Amp Electrical Inc. | 7A0190B2F9 | Apprenticeship Sponsor | Jun 30, 2016 |
| East Hartford, CT | Amped Up Electric | 1A692820C4 | Apprenticeship Sponsor | Jun 30, 2027 |
| Granby, CT | AMSGG dba Andrea's Mechanical | B5F642A7B5 | Apprenticeship Sponsor | Jun 30, 2013 |
| Ellington, CT | Amtech Lighting Services | 9C42CF7CD0 | Apprenticeship Sponsor | Jun 30, 2008 |
| North Granby, CT | Amuso Electric, LLC | 6807D20B7D | Apprenticeship Sponsor | Jun 30, 2006 |
| Shelton, CT | AMZ Electric, LLC | 017995B808 | Apprenticeship Sponsor | Jun 30, 2027 |
| New Milford, CT | Analytical & Combustion Systems | 110692DDBB | Apprenticeship Sponsor | Jun 30, 2019 |
| Windsor, CT | Anchor Electrical Contractors Inc. | 974B239987 | Apprenticeship Sponsor | Jun 30, 2011 |
| Stamford, CT | AND Mechanical, LLC | 84CD942D24 | Apprenticeship Sponsor | Jun 30, 2026 |
| Dayville, CT | Andersen Electric | CBB525E64E | Apprenticeship Sponsor | Jun 30, 2024 |
| Ledyard, CT | ANDERSEN OIL CO | A52513768F | Home Heating Fuel Dealer + 3 more | Sep 30, 2027 |
| Unionville, CT | ANDERSON IRRIGATION, LLC | 97DEC34B9A | Apprenticeship Sponsor | Jun 30, 2027 |
| Avon, CT | Anderson Turf Irrigation, Inc. | B1179552EC | Apprenticeship Sponsor | Jun 30, 2027 |
| Vernon, CT | Andresen Electrical Services, LLC | 50C4414341 | Apprenticeship Sponsor | Jun 30, 2021 |
| East Longmeadow, MA | Andrew W. Dutko | 70A198F156 | Apprenticeship Sponsor | Jun 30, 2006 |
| South Windsor, CT | ANDREWS OIL COMPANY & GAS SERVICES, INC. | CD6A9F7851 | Home Heating Fuel Dealer + 2 more | Sep 30, 2027 |
| West Hartford, CT | ANDY WOTTON PLUMBING & HEATING, LLC | FAF5BA238B | Apprenticeship Sponsor | Jun 30, 2026 |
| Waterbury, CT | Andy's Heating & Cooling | D5063101C7 | Apprenticeship Sponsor | Jun 30, 2013 |
| Waterbury, CT | ANDY'S OIL SERVICE | 346CCB996E | Home Heating Fuel Dealer + 2 more | Sep 30, 2027 |
| New Canaan, CT | ANE Electrical & Technology Solutions, LLC | 47E947D871 | Apprenticeship Sponsor | Jun 30, 2027 |
| Fairfield, CT | Angelo's Burner Service | 7BF9E6C3F9 | Apprenticeship Sponsor | Jun 30, 2010 |
| Ellington, CT | Angeloni Refrigeration, Inc. | FFA6A5F950 | Apprenticeship Sponsor | Jun 30, 2007 |
| Westport, CT | ANGELS' Inc. | 6699E421F5 | Apprenticeship Sponsor | Jun 30, 2027 |
| North Branford, CT | Annex Mechanical Contractors, Inc. | DF71691B13 | Apprenticeship Sponsor | Jun 30, 2027 |
| Naugatuck, CT | Anomatic Corporation | 8962845E4E | Apprenticeship Sponsor | Jun 30, 2027 |
| Farmington, CT | Anopolsky Plumbing & Heating, LLC | 9C445297D1 | Apprenticeship Sponsor | Jun 30, 2004 |
| Oakdale, CT | Anselmo Plumbing & Heating LLC | 2E394A856A | Apprenticeship Sponsor | Jun 30, 2015 |
| Ansonia, CT | Ansonia Plastics, LLC dba: NPI Medical | 08AB5DEB90 | Apprenticeship Sponsor | Jun 30, 2019 |
| Norwalk, CT | Anthony Badaracco Plumbing & Heating, LLC | BDF83C96A7 | Apprenticeship Sponsor | Jun 30, 2027 |
| Norwalk, CT | Anthony Caruso Plumbing & Heating LLC | 903A35A48E | Apprenticeship Sponsor | Jun 30, 2011 |
| Southbury, CT | Anthony Vizzo Plumbing & Heating LLC | 826713654A | Apprenticeship Sponsor | Jun 30, 2025 |
| Monroe, CT | Anthony's Piping Contractors Inc. | 8B8CA7DABE | Apprenticeship Sponsor | Jun 30, 2005 |
| Danbury, CT | Antonio Cangianni, Inc. | 912EBE9721 | Apprenticeship Sponsor | Jun 30, 2017 |
| New Haven, CT | Anvil Associates, LLC | 28E9E2664A | Apprenticeship Sponsor | Jun 30, 2009 |
| Griswold, CT | Anything Plumbing | E71278A8AD | Apprenticeship Sponsor | Jun 30, 2027 |
| Mystic, CT | AP Electric, LLC | 4AC35EEAFE | Apprenticeship Sponsor | Jun 30, 2023 |
| Wallingford, CT | APCT, Inc. | 1F5F79C1E3 | Apprenticeship Sponsor | Jun 30, 2022 |
| North Branford, CT | Apex Electric LLC | 99538BB74E | Apprenticeship Sponsor | Jun 30, 2020 |
| Newtown, CT | Apex Glass & Aluminum Products Inc. | E33DA5E2DA | Apprenticeship Sponsor | Jun 30, 2022 |
| Plainville, CT | Apex Industrial Electric | 37F095CF19 | Apprenticeship Sponsor | Jun 30, 2027 |
| Palmer, MA | Apex Mechanical Services, LLC | 9FD5DB13F5 | Apprenticeship Sponsor | Jun 30, 2027 |
| Stamford, CT | Apex Mechanical, LLC | 24CF354060 | Apprenticeship Sponsor | Jun 30, 2027 |
| Prospect, CT | APEX PLUMBING LLC | 9668011EBC | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Bolton, CT | APEX REFRIGERATION, COOLING & HEATING, LLC | 449C95269A | Apprenticeship Sponsor | Jun 30, 2027 |
| Hamden, CT | Apollo Refrigeration, Inc. | A56C9EC171 | Apprenticeship Sponsor | Jun 30, 2017 |
| Northford, CT | Apple Electric, LLC | 02F20626AE | Apprenticeship Sponsor | Jun 30, 2011 |
| Avon, CT | APPLE HEALTH CARE INC APPLE REHAB CORPORATE | 718E0A14C1 | Major Contractor + 2 more | Jun 30, 2027 |
| West Haven, CT | Apple Oil Company | 235821AD68 | Apprenticeship Sponsor | Jun 30, 2026 |
| Plantsville, CT | Apple Valley Electric, LLC | FC64DAC538 | Apprenticeship Sponsor | Jun 30, 2015 |
| Southington, CT | Apple Valley Irrigation, LLC | 8D3BBAB1AC | Apprenticeship Sponsor | Jun 30, 2024 |
| Old Lyme, CT | Appleby Plumbing Co., LLC | 2173D502F8 | Apprenticeship Sponsor | Jun 30, 2026 |
| Westbrook, CT | Applied Energy Group DBA:Temp Tech Mechanical & Salt Aire Sheetmet | 00DDF0EEE0 | Apprenticeship Sponsor | Jun 30, 2011 |
| Woodbury, CT | Applied Mechanical Systems, Inc. | 7B26ED07CD | Apprenticeship Sponsor | Jun 30, 2007 |
| Hartford, CT | Apprentos PBC | 97A43092A1 | Apprenticeship Sponsor | Jun 30, 2027 |
| Wallingford, CT | APS Technology, Inc. | 8C5FEA3AB1 | Apprenticeship Sponsor | Jun 30, 2022 |
| Sandy Hook, CT | APS, LLC | 7F6748574F | Apprenticeship Sponsor | Jun 30, 2018 |
| Guilford, CT | Apuzzo Electric LLC DBA/ John Apuzzo LLC | 012E4271D6 | Apprenticeship Sponsor | Jun 30, 2027 |
| Bristol, CT | AQ Services, LLC. | 752769DA29 | Apprenticeship Sponsor | Jun 30, 2020 |
| Newington, CT | Aqua Backflow-Gallicchio Plumbing Inc. | D17B1DCD12 | Apprenticeship Sponsor | Jun 30, 2018 |
| Oxford, CT | Aqua Plumbing LLC | 2BD486C1CB | Apprenticeship Sponsor | Jun 30, 2009 |
| Stafford Springs, CT | Aqua Pump Co., Inc. | 5B73031B4A | Apprenticeship Sponsor | Jun 30, 2027 |
| Guilford, CT | Aqua Source | A7925B44F5 | Apprenticeship Sponsor | Jun 30, 2005 |
| Meriden, CT | Aqua-C Plumbing & Heating, Inc. | 41824166FF | Apprenticeship Sponsor | Jun 30, 2008 |
| Fairfield, CT | AQUA-LAWN, INC. | EEB6D576B2 | Apprenticeship Sponsor | Jun 30, 2027 |
| Windsor Locks, CT | Aquatech Lawn Sprinklers Inc. | 886530596F | Apprenticeship Sponsor | Jun 30, 2004 |
| Fairfield, CT | Aquila Heating & Cooling, LLC | 912A7B63D8 | Apprenticeship Sponsor | Jun 30, 2027 |
| West Hartford, CT | Aramark Facilities | 1F874F4BC9 | Apprenticeship Sponsor | Jun 30, 2026 |
| East Hampton, CT | Arbiter Electric LLC | 0259D4E6DE | Apprenticeship Sponsor | Jun 30, 2027 |
| Cheshire, CT | Arbor Oil, LLC | 1C1C5F9741 | Apprenticeship Sponsor | Jun 30, 2020 |
| Cromwell, CT | ARBORIO CORPORATION | F5874BABE7 | Major Contractor + 2 more | Jun 30, 2027 |
| Shelton, CT | Arc Electric, LLC | F0C6664C75 | Apprenticeship Sponsor | Jun 30, 2027 |
| Wolcott, CT | ARC Mechanical Services, LLC | 4877186594 | Apprenticeship Sponsor | Jun 30, 2019 |
| Wolcott, CT | ARC Mechanical, LLC | DA59BA2DA2 | Apprenticeship Sponsor | Jun 30, 2027 |
| Rocky Hill, CT | Arcari Plumbing | 6B9612FF50 | Apprenticeship Sponsor | Jun 30, 2008 |
| Newtown, CT | ARCH Medical Solutions - Newtown, LLC | 5EB546E999 | Apprenticeship Sponsor | Jun 30, 2025 |
| Torrington, CT | Archer Heating & Cooling | 5DE14C571D | Apprenticeship Sponsor | Jun 30, 2024 |
| Danielson, CT | Architectural Curtainwall, Inc. | CD48133E6A | Apprenticeship Sponsor | Jun 30, 2025 |
| Berlin, CT | ARCHITECTURAL GLASS & STOREFRONT, INC. | 3F15F2E415 | Apprenticeship Sponsor | Jun 30, 2027 |
| Beacon Falls, CT | Arctic Air, Inc. | C83AE6624D | Apprenticeship Sponsor | Jun 30, 2011 |
| Monroe, CT | Aries Electric, LLC | CB0A97411B | Apprenticeship Sponsor | Jun 30, 2022 |
| Oxford, CT | Armed & Ready Alarm Systems, Inc. | 798EAEAEB0 | Apprenticeship Sponsor | Jun 30, 2024 |
| Middletown, CT | Armstrong Plumbing & Heating, Inc. | DEAEFA8232 | Apprenticeship Sponsor | Jun 30, 2019 |
| Bristol, CT | Arna Machine Company | 82E7B0C8D2 | Apprenticeship Sponsor | Jun 30, 2019 |
| New Fairfield, CT | Arnold Brothers Electric Inc. | 870928BD56 | Apprenticeship Sponsor | Jun 30, 2027 |
| Woodbridge, CT | Arnold Goldberg & Sons Electric | 4FD910E7A8 | Apprenticeship Sponsor | Jun 30, 2023 |
| Salem, CT | Arnott Plumbing & Heating, LLC | E49C175D3A | Apprenticeship Sponsor | Jun 30, 2009 |
| North Haven, CT | Around The Clock Heating & Cooling Inc. | DBFF07959B | Apprenticeship Sponsor | Jun 30, 2027 |
| Oxford, CT | ARP Welding, LLC | DE5C78C246 | Apprenticeship Sponsor | — |
| Milford, CT | Array Systems, LLC | 4C789836DF | Apprenticeship Sponsor | Jun 30, 2020 |
| Rockfall, CT | ARRIGONI PLUMBING LLC | 79D17D7B91 | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Dayville, CT | Arrington Electric, LLC | 18D75A7825 | Apprenticeship Sponsor | Jun 30, 2004 |
| Danbury, CT | Arrive Electrical Contractor LLC | 5FAB0F32D6 | Apprenticeship Sponsor | Jun 30, 2027 |
| Ellington, CT | Arrow Diversified Tooling, Inc. | 20B304F4CE | Apprenticeship Sponsor | Jun 30, 2021 |
| Norwalk, CT | Arrow Electric LLC | 3C98E3AECE | Apprenticeship Sponsor | Jun 30, 2006 |
| Bristol, CT | Arrow Manufacturing Co., Inc. | BD509EC67C | Apprenticeship Sponsor | Jun 30, 2019 |
| Watertown, CT | Arrow Plumbing Services, LLC | 30EE025864 | Apprenticeship Sponsor | Jun 30, 2009 |
| Danbury, CT | Arrowhead Plumbing | 5061992C1B | Apprenticeship Sponsor | Jun 30, 2007 |
| East Haven, CT | Art DeCato Enterprises, LLC | 98FA5BC144 | Apprenticeship Sponsor | Jun 30, 2008 |
| Hamden, CT | Art-Co Services, LLC | A5C512B9C4 | Apprenticeship Sponsor | Jun 30, 2008 |
| South Glastonbury, CT | Artek Electrical Services LLC | E2148D7896 | Apprenticeship Sponsor | Jun 30, 2027 |
| Middletown, CT | Artis Energy | 4154BC1ADE | Apprenticeship Sponsor | Jun 30, 2026 |
| Woodbury, CT | Artistic Irrigation LLC | 2DF8FBC3C7 | Apprenticeship Sponsor | Jun 30, 2011 |
| Berlin, CT | ARTISTIC PLUMBING AND HEATING | 94F40D512F | Apprenticeship Sponsor | Jun 30, 2026 |
| Wallingford, CT | Asbestos Workers JATC Local #33 Heat & Frost Insulators | 79B50351B4 | Apprenticeship Sponsor | Jun 30, 2027 |
| Fairfield, CT | Ascot Plumbing Co. L.L.C. | F58E7C503C | Apprenticeship Sponsor | Jun 30, 2006 |
| Winsted, CT | Ash Family Heating and Cooling | C149137098 | Apprenticeship Sponsor | Jun 30, 2026 |
| Wallingford, CT | ASHLAR VILLAGE INC MASONICARE AT ASHLAR VILLAGE | 877DEE293A | Restaurant Caterer + 2 more | Jun 10, 2027 |
| East Granby, CT | Ashmore Electric Inc. | 8B76A9660A | Apprenticeship Sponsor | Jun 30, 2006 |
| Danbury, CT | Asim's Plumbing, LLC | BD9A44EF27 | Apprenticeship Sponsor | Jun 30, 2017 |
| West Haven, CT | Asmus Electric Inc. | 19B3C3F91D | Apprenticeship Sponsor | Jun 30, 2014 |
| Springfield, MA | Assarian Electric Company | CDA77B38E3 | Apprenticeship Sponsor | Jun 30, 2006 |
| Waterford, CT | Assertive Solutions, Inc. | B3A2C28C27 | Apprenticeship Sponsor | Jun 30, 2014 |
| East Hartford, CT | Associated Electronic Systems, Inc. | FAA0C4BF43 | Apprenticeship Sponsor | Jun 30, 2018 |
| Winsted, CT | Associated Mechanical Contractors LLC | A304E00625 | Apprenticeship Sponsor | Jun 30, 2018 |
| East Hartford, CT | Associated Security Corp. | 560633555F | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Wolcott, CT | Associated Security Systems, LLC | 59DDDD5E00 | Apprenticeship Sponsor | Jun 30, 2027 |
| Bristol, CT | Associated Spring-Barnes Group Inc. DBA BARNES GROUP | 69821773D7 | Apprenticeship Sponsor | Jun 30, 2020 |
| Norwalk 06855, CT | ASTACIO PLUMBING, HVAC, ELECTRICAL | 155A411839 | Apprenticeship Sponsor | Jun 30, 2027 |
| Waterbury, CT | Astro Electric, Inc. | 3B8A28ABA4 | Apprenticeship Sponsor | Jun 30, 2027 |
| East Hampton, CT | Astro Electrical Contractors, Inc. | D90E86D0D5 | Apprenticeship Sponsor | Jun 30, 2008 |
| Hartford, CT | AT Mechanical, LLC | 3C1F3F6FDE | Apprenticeship Sponsor | Jun 30, 2006 |
| Waterbury, CT | ATI Electrical Construction, LLC | 5BFE55A5FA | Apprenticeship Sponsor | Jun 30, 2012 |
| Naugatuck, CT | Atlantic A/C, Refrigeration & Heating, Inc. | 00FE647457 | Apprenticeship Sponsor | Jun 30, 2011 |
| Milford, CT | Atlantic Coast Electric Inc. | 23CBB75C86 | Apprenticeship Sponsor | Jun 30, 2008 |
| Middlefield, CT | Atlantic Electric LLC | 452D0A84EF | Apprenticeship Sponsor | Jun 30, 2027 |
| South Windsor, CT | Atlantic Mechanical Services, LLC | 008FC9D7C9 | Apprenticeship Sponsor | Jun 30, 2027 |
| Prospect, CT | Atlantic Plumbing & Heating, LLC | B1A1573017 | Apprenticeship Sponsor | Jun 30, 2010 |
| Bristol, CT | Atlantic Precision Spring, Inc. | B3F9330FC4 | Apprenticeship Sponsor | Jun 30, 2023 |
| Glastonbury, CT | Atlantic Telecom | 4B739F6DF4 | Apprenticeship Sponsor | Jun 30, 2017 |
| Cromwell, CT | Atlantic Ventilating & Equipment Co. Inc. | 5E4677372C | Apprenticeship Sponsor | Jun 30, 2025 |
| Norwalk, CT | Atlantis Plumbing | 52DB4EDFD9 | Apprenticeship Sponsor | Jun 30, 2005 |
| Belchertown, MA | Atlas Electric Corp. | 79C081EDBD | Apprenticeship Sponsor | Jun 30, 2010 |
| Torrington, CT | Atlas Plumbing | 6BF1C2A3CD | Apprenticeship Sponsor | Jun 30, 2004 |
| Newington, CT | Atlas Stamping & Manufacturing Corporation | 9483FA6B0E | Apprenticeship Sponsor | Jun 30, 2027 |
| Stamford, CT | Atmosphere Cooling & Heating, LLC | 5319AD7101 | Apprenticeship Sponsor | Jun 30, 2022 |
| Hamden, CT | ATP ELECTRIC, LLC RLD ELECTRIC | 51832A31A7 | Apprenticeship Sponsor | Jun 30, 2027 |
| Sandy Hook, CT | ATS Electrical Contracting, LLC | FFFF25F22C | Apprenticeship Sponsor | Jun 30, 2020 |
| Terryville, CT | Atticus Plumbing Group, LLC | 2547F60303 | Apprenticeship Sponsor | Jun 30, 2020 |
| North Grosvenordale, CT | Aubin & Sons Plumbing and Heating | 5541A92B89 | Apprenticeship Sponsor | Jun 30, 2010 |
| Windsor, CT | Audacity, LLC | E7ABAA333F | Apprenticeship Sponsor | — |
| Sherman, CT | Audette Electrical Services, Inc. | E2B8D5C765 | Apprenticeship Sponsor | Jun 30, 2027 |
| Bridgeport, CT | Audio F/X LLC | F29B38D0CF | Apprenticeship Sponsor | Jun 30, 2007 |
| Norwalk, CT | AUDIOCOM INC REALM | 86A2ABF206 | Tv & Radio Dealer + 2 more | Aug 31, 2027 |
| Plantsville, CT | Augustine Builders, LLC | 21F40A3DDB | Apprenticeship Sponsor | Jun 30, 2027 |
| Fairfield, CT | Augustine Electric, Inc. | 2446CED3FA | Apprenticeship Sponsor | Jun 30, 2027 |
| Stratford, CT | Authentic Plumbing, LLC | 293058FE05 | Apprenticeship Sponsor | Jun 30, 2012 |
| Plainville, CT | Auto Glass Unlimited LLC | F4504354CE | Apprenticeship Sponsor | Jun 30, 2007 |
| Easton, CT | Auto Home Commercial Electronic Systems | 3457E7CD7B | Apprenticeship Sponsor | Jun 30, 2027 |
| Glastonbury, CT | Automated Building Systems, Inc. | 1C618A2A74 | Apprenticeship Sponsor | Jun 30, 2027 |
| Wallingford, CT | Automated Logic Corporation | F01C5C1B06 | Apprenticeship Sponsor | Jun 30, 2019 |
| Shelton, CT | Automatic Plumbing & Heating, Inc. | 323EB7215F | Apprenticeship Sponsor | Jun 30, 2027 |
| Shelton, CT | Automatic Rain Inc. | 5857601541 | Apprenticeship Sponsor | Jun 30, 2012 |
| Trumbull, CT | Autuori Electric L.L.C. | 66E0D9CA8A | Apprenticeship Sponsor | Jun 30, 2017 |
| North Branford, CT | Avallone Heating & Cooling, LLC | F121514392 | Apprenticeship Sponsor | Jun 30, 2027 |
| New London, CT | Avery Electric | 6FB1111475 | Apprenticeship Sponsor | Jun 30, 2015 |
| Watertown, CT | AVET Contracting, LLC | 237CD6709C | Apprenticeship Sponsor | Jun 30, 2021 |
| Torrington, CT | AVI International | CA7812A77C | Apprenticeship Sponsor | — |
| Manchester, CT | AVI-SPL | 5D7C358A9F | Apprenticeship Sponsor | Jun 30, 2027 |
| Westport, CT | AVILA ELECTRICAL SERVICES, LLC | 8F5D8DBE58 | Apprenticeship Sponsor | Jun 30, 2027 |
| New Britain, CT | AVNA | CC219EA877 | Apprenticeship Sponsor | Jun 30, 2027 |
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.