Apprenticeship Sponsor — page 18 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 |
|---|---|---|---|---|
| Canton, CT | SUBURBAN SANITATION SERVICE INC | 2DFF525A6F | Home Improvement Contractor + 2 more | Mar 31, 2027 |
| Northford, CT | Suburban Service Company, LLC | A942531A11 | Apprenticeship Sponsor | Jun 30, 2027 |
| Danbury, CT | Suggs Electric | 084B804988 | Apprenticeship Sponsor | Jun 30, 2016 |
| Deep River, CT | Sullivan Electric, LLC | 22CFADA168 | Apprenticeship Sponsor | Jun 30, 2018 |
| Ivoryton, CT | SULLIVAN LAWN SERVICES, L.L.C. | AD92905B7C | Pesticide Application Business Registration + 2 more | Aug 31, 2027 |
| Plainville, CT | Sullivan-Benson, LLC | 1F8EDCF68C | Apprenticeship Sponsor | Jun 30, 2014 |
| Manchester, CT | Sumitomo Bakelite North America | BF56AFFED4 | Apprenticeship Sponsor | Jun 30, 2009 |
| Trumbull, CT | Summ Mechanical, LLC | 1621476386 | Apprenticeship Sponsor | Jun 30, 2016 |
| Milldale, CT | SUMMA CONSTRUCTION SERVICES LLC | A84B9647CF | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Greenwich, CT | SUMMER RAIN SPRINKLER SYSTEMS, INC. LANDSCAPE LIGHTING/ELECTRICAL CONTRACTORS INC | 3E360972C9 | Apprenticeship Sponsor | Jun 30, 2027 |
| New Fairfield, CT | Summit Air Conditioning & Heating LLC | B321CFD6D1 | Apprenticeship Sponsor | Jun 30, 2012 |
| Trumbull, CT | Summit Electrical and Communication Contractors LLC | B693059988 | Apprenticeship Sponsor | Jun 30, 2027 |
| Middletown, CT | SUMMIT FIRE & SECURITY | 49DF9F41B8 | Apprenticeship Sponsor | Jun 30, 2027 |
| New Fairfield, CT | Sun Electric LLC | B5FBB0176C | Apprenticeship Sponsor | Jun 30, 2013 |
| Prospect, CT | Sun-Ray Electric LLC | 13C7EF06D6 | Apprenticeship Sponsor | Jun 30, 2009 |
| Newington, CT | Sunbelt Rentals, Inc. | EF867724A4 | Apprenticeship Sponsor | Jun 30, 2010 |
| Ridgefield, CT | Sunburst Plumbing & Heating Inc. | FB94D68ACD | Apprenticeship Sponsor | Jun 30, 2027 |
| New Haven, CT | Sunderland Electric LLC | 48B31B8893 | Apprenticeship Sponsor | Jun 30, 2027 |
| Southport, CT | Sunlight Electric, LLC | 1ACE28D44E | Apprenticeship Sponsor | Jun 30, 2027 |
| New Haven, CT | Sunlight Solar Energy, Inc. | D2DDBF9BD4 | Apprenticeship Sponsor | Jun 30, 2023 |
| Wallingford, CT | Sunnova Energy Corp. | 49C86A81EA | Apprenticeship Sponsor | Jun 30, 2025 |
| Newington, CT | SunPower Corporation Systems | 0B2A30B297 | Apprenticeship Sponsor | Jun 30, 2024 |
| North Haven, CT | SUNRISE COVE PARTNERS LLC SRC PARTNERS | 1403C2C7D8 | New Home Construction Contractor + 1 more | Mar 31, 2027 |
| Rocky Hill, CT | Sunrun Installation Services, Inc. | B5DF286CDB | Apprenticeship Sponsor | Jun 30, 2027 |
| Guilford, CT | Sunsearch, LLC | 16B6AA6D2F | Apprenticeship Sponsor | Jun 30, 2008 |
| Ellington, CT | SUNSET VALLEY CONSTRUCTION LLC | FBE3646D99 | Demolition Contractor + 3 more | Aug 31, 2027 |
| Waterbury, CT | Sunshine Oil, Inc. | 57F0C2DEDD | Apprenticeship Sponsor | Jun 30, 2006 |
| Stamford, CT | Super K Electric LLC | E31C25E15D | Apprenticeship Sponsor + 2 more | Jun 30, 2027 |
| Bethel, CT | Superior Air Systems LLC | 348B35404D | Apprenticeship Sponsor | Jun 30, 2007 |
| Ansonia, CT | Superior Comfort Heating & Air Conditioning | 06CFFE2892 | Apprenticeship Sponsor | Jun 30, 2027 |
| Trumbull, CT | Superior Electric & Security | D4C2696AE6 | Apprenticeship Sponsor | Jun 30, 2015 |
| Newington, CT | SUPERIOR ELECTRIC, LLC | 27D0856F3C | Apprenticeship Sponsor | Jun 30, 2027 |
| Hamden, CT | Superior Electrical Construction, LLC | BC8D4B59BE | Apprenticeship Sponsor | Jun 30, 2011 |
| Waterbury, CT | Superior Fuel, Inc | C30F4A04AC | Apprenticeship Sponsor | Jun 30, 2019 |
| Berlin, CT | Superior Heating & Cooling, Inc. | 7BC3C766A1 | Apprenticeship Sponsor | Jun 30, 2027 |
| Oxford, CT | Superior Mechanical Insulation, LLC | 36484B9E42 | Apprenticeship Sponsor | Jun 30, 2020 |
| Fairfield, CT | Superior Mechanical, Inc. | 6F7128B404 | Apprenticeship Sponsor | Jun 30, 2020 |
| Norwalk, CT | Superior Plumbing & Heating, LLC | 3BAF8B7486 | Apprenticeship Sponsor | Jun 30, 2019 |
| Seymour, CT | Superior Plus Energy Services | 5F647D851B | Apprenticeship Sponsor | Jun 30, 2024 |
| Cheshire, CT | Superior Service Group, LLC | 70B6E5D181 | Apprenticeship Sponsor | Jun 30, 2009 |
| Mystic, CT | Superior Sewer & Drain Service | 353F247809 | Apprenticeship Sponsor | Jun 30, 2027 |
| Seymour, CT | Superior Water & Radon Systems, LLC | 48F01BA6D9 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Bristol, CT | Supreme Electric, LLC | BEE76FA409 | Apprenticeship Sponsor | Jun 30, 2026 |
| Waterbury, CT | Supreme Plumber | 09F79EEC69 | Apprenticeship Sponsor | Jun 30, 2023 |
| Colchester, CT | Suroviak's Electric, Inc. | EC9C1C2DE0 | Apprenticeship Sponsor | Jun 30, 2006 |
| Plainville, CT | SVMH, LLC | 1CC64294E6 | Apprenticeship Sponsor | Jun 30, 2023 |
| Newington, CT | Swan Associates, Inc. | 3AC210A2BA | Apprenticeship Sponsor | Jun 30, 2027 |
| Wolcott, CT | Swan Electric LLC | E684B55C65 | Apprenticeship Sponsor | Jun 30, 2023 |
| Litchfield, CT | Swanson Electric LLC | 4CBB8CF3AA | Apprenticeship Sponsor | Jun 30, 2027 |
| Norwalk, CT | Swanson Plumbing & Heating, LLC | 523996CE31 | Apprenticeship Sponsor | Jun 30, 2005 |
| North Haven, CT | Sweeney & Sweeney Home Technology dba Hometronics Lifestyles | 154944C117 | Apprenticeship Sponsor | Jun 30, 2006 |
| Hamden, CT | Sweeney Excavation | A39347B099 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Enfield, CT | Sweetman Electric | 536766083C | Apprenticeship Sponsor | Jun 30, 2027 |
| Shelton, CT | SWITCH ELECTRIC LLC | AF7681CA67 | Apprenticeship Sponsor | Jun 30, 2026 |
| Deep River, CT | SWPC Plastics, LLC | 3D8E074F10 | Apprenticeship Sponsor | Jun 30, 2022 |
| Westerly, RI | Synergy Electrical Systems - RI | 6BD898278E | Apprenticeship Sponsor | Jun 30, 2021 |
| Plainville, CT | Synergy Electrical Systems, LLC | DA89F579E2 | Apprenticeship Sponsor | Jun 30, 2027 |
| Monroe, CT | Synergy Security Systems, Inc. | D113D2D9BA | Apprenticeship Sponsor | Jun 30, 2009 |
| Middletown, CT | Synergy Smart Homes, LLC | B70AA67B11 | Apprenticeship Sponsor | Jun 30, 2026 |
| Farmington, CT | Systematic Automation Inc. | FDC5CB4987 | Apprenticeship Sponsor | Jun 30, 2027 |
| Southington, CT | SYSTEMONE, LLC | B6CE283086 | Apprenticeship Sponsor | Jun 30, 2027 |
| Vernon, CT | Systems Electric LLC | 97D57A52A4 | Apprenticeship Sponsor | Jun 30, 2014 |
| East Hampton, CT | Systems Operating Services LLC | 3BD1B2B95D | Apprenticeship Sponsor | Jun 30, 2008 |
| Bridgeport, CT | Systems Resources Syre Corp. | C0A37B482E | Apprenticeship Sponsor | Jun 30, 2007 |
| Brooklyn, CT | T & A Mechanical, LLC | F78A3AA872 | Apprenticeship Sponsor | Jun 30, 2023 |
| South Windsor, CT | T & H Electric, Inc. | E52990D73F | Apprenticeship Sponsor | Jun 30, 2027 |
| Unionville, CT | T & J Electric, Inc. | 4A717A88AB | Apprenticeship Sponsor | Jun 30, 2008 |
| Dalton, MA | T & M Electric Inc. | 95716B8A33 | Apprenticeship Sponsor | Jun 30, 2014 |
| Central Village, CT | T & S Electric LLC | 6F10D93E89 | Apprenticeship Sponsor | Jun 30, 2027 |
| Portland, CT | T & S HEATING & AIR CONDITIONING DUTCH OIL COMPANY INC | 8C42183DE6 | Home Heating Fuel Dealer + 1 more | Sep 30, 2027 |
| Moosup, CT | T & S OIL CO | F658DD7147 | Retail Gasoline Dealer + 4 more | Oct 31, 2027 |
| Hartford, CT | T & T ELECTRICAL CONTRACTORS, INC. | FEF6A5E92F | Apprenticeship Sponsor | Jun 30, 2027 |
| Meriden, CT | T & T Plumbing | 2F2438751D | Apprenticeship Sponsor | Jun 30, 2015 |
| North Stonington, CT | T & W Plumbing & Heating, Inc. | C8D3B28DAD | Apprenticeship Sponsor | Jun 30, 2025 |
| Marlborough, MA | T K Bridge Electrical Services Inc. | 4DA70EAB86 | Apprenticeship Sponsor | Jun 30, 2006 |
| Vernon, CT | T. F. Jones Plumbing LLC | 0CA71B9587 | Apprenticeship Sponsor | Jun 30, 2026 |
| North Stonington, CT | T. I. G. Electric, Inc. | FF8120F87F | Apprenticeship Sponsor | Jun 30, 2012 |
| North Haven, CT | T. Jermine & Son's Inc. | EFE3F7A382 | Apprenticeship Sponsor | Jun 30, 2026 |
| Stamford, CT | T. Sessa & Son Inc. | 2F83D22AF4 | Apprenticeship Sponsor | Jun 30, 2014 |
| Bristol, CT | T.A.P. Plumbing & Heating, LLC | 73C718E4FF | Apprenticeship Sponsor | Jun 30, 2027 |
| New Milford, CT | T.B. Mechanical, LLC | F3803324DD | Apprenticeship Sponsor | Jun 30, 2017 |
| Bloomfield, CT | T.C. PLUMBING & HEATING | A0EC54470B | Apprenticeship Sponsor | Jun 30, 2026 |
| Orange, CT | T.C.'s Plumbing & Heating LLC | 731ABF4CE5 | Apprenticeship Sponsor | Jun 30, 2027 |
| Milford, CT | T.J. Murphy Plumbing & Heating, LLC | 3CBF804E34 | Apprenticeship Sponsor | Jun 30, 2025 |
| West Haven, CT | T.J. Plumbing Supplies & Service, LLC | EA751B0EE1 | Apprenticeship Sponsor | Jun 30, 2023 |
| Danbury, CT | T.J. Russell Electric, LLC | 3DAE19B2EC | Apprenticeship Sponsor | Jun 30, 2026 |
| Northford, CT | T.K.W. Electric, Inc. | DC580B1438 | Apprenticeship Sponsor | Jun 30, 2016 |
| Southington, CT | T.P. Heating & Cooling, LLC | 443EDFC276 | Apprenticeship Sponsor | Jun 30, 2023 |
| West Haven, CT | T.P.L. Electric, LLC | E1A5156A8B | Apprenticeship Sponsor | Jun 30, 2027 |
| Bristol, CT | TABACCO & SON BUILDERS INC | 74D587B4E4 | Major Contractor + 4 more | Jun 30, 2027 |
| Rocky Hill, CT | Tabshey Plumbing Contractors | C25470449E | Apprenticeship Sponsor | Jun 30, 2022 |
| Shelton, CT | Tadduni's Plumbing & Heating | 90BDD081E5 | Apprenticeship Sponsor | Jun 30, 2018 |
| East Canaan, CT | Tadiello Electric | 3659627513 | Apprenticeship Sponsor | Jun 30, 2015 |
| West Hartford, CT | TAG Constructors of New England, LLC | 4575B93636 | Apprenticeship Sponsor | Jun 30, 2019 |
| Wilton, CT | Tait Heating & Cooling LLC | 02F1B25C46 | Apprenticeship Sponsor | Jun 30, 2008 |
| Collinsville, CT | Talcott Electrical Services, LLC | 6E4BDB5668 | Apprenticeship Sponsor | Jun 30, 2023 |
| East Granby, CT | Talcott View Development Co., Inc. | 5ED94B143B | Apprenticeship Sponsor | Jun 30, 2015 |
| Orange, CT | TAMARO OIL CORPORATION | 2FAD9C0467 | Home Heating Fuel Dealer + 2 more | Sep 30, 2027 |
| Bristol, CT | TANKFARM LOGISTICS INC TANKFARM | FC42A576ED | Home Heating Fuel Dealer + 3 more | Sep 30, 2027 |
| Beacon Falls, CT | Tanner's Plumbing LLC | 9FCB5DCA1A | Apprenticeship Sponsor | Jun 30, 2009 |
| Norwalk, CT | Tarala Electric Group, LLC | 05255D06D9 | Apprenticeship Sponsor | Jun 30, 2027 |
| Norwalk, CT | Tarala Electrical, LLC | DEADE0F00F | Apprenticeship Sponsor | Jun 30, 2017 |
| Stamford, CT | Tarzia Electric Inc. | C8E11543BC | Apprenticeship Sponsor | Jun 30, 2009 |
| Stamford, CT | Tarzia Plumbing & Heating | 1BEA0D7644 | Apprenticeship Sponsor | Jun 30, 2026 |
| Dayville, CT | Tavernier Electric | 0E11C42399 | Apprenticeship Sponsor | Jun 30, 2011 |
| Danbury, CT | Taylor & Sons Plumbing L.L.C. | 65745DB845 | Apprenticeship Sponsor | Jun 30, 2009 |
| Hartford, CT | Taylor Electric, LLC | CC83FDFC4F | Apprenticeship Sponsor | Jun 30, 2027 |
| Hamden, CT | Taylor Freezer of Connecticut, Inc. | 59C2C8104C | Apprenticeship Sponsor | Jun 30, 2025 |
| Wolcott, CT | TD Electric, LLC | 482358E69D | Apprenticeship Sponsor | Jun 30, 2027 |
| Newington, CT | TDJ Services, LLC | ED3AA9F1BC | Apprenticeship Sponsor | Jun 30, 2008 |
| Windsor, CT | Team AVS | 7CCA1F15D5 | Apprenticeship Sponsor | Jun 30, 2005 |
| Southbury, CT | Team Electric, Inc. | C2C5525A4B | Apprenticeship Sponsor | Jun 30, 2012 |
| East Hartford, CT | Team Mechanical LLC | A51C3A44E0 | Apprenticeship Sponsor | Jun 30, 2027 |
| Waterbury, CT | TEC Corp. | 1D7752878C | Apprenticeship Sponsor | Jun 30, 2010 |
| Meriden, CT | TEC Electrical Service LLC | 165E5CB0C4 | Apprenticeship Sponsor | Jun 30, 2015 |
| Stamford, CT | Tech Electrical Contractors, LLC | 1F395A0341 | Apprenticeship Sponsor | Jun 30, 2005 |
| East Hampton, CT | Tech Unlimited, LLC | E319477AB0 | Apprenticeship Sponsor | Jun 30, 2024 |
| Uncasville, CT | Tech-Air Inc. | E79ED9F6A1 | Apprenticeship Sponsor | Jun 30, 2015 |
| Manchester, CT | Technical Engineering, LLC | 59D73631C1 | Apprenticeship Sponsor | Jun 30, 2018 |
| Torrington, CT | Technical Industries, Inc. | 75460D8744 | Apprenticeship Sponsor | — |
| Naugatuck, CT | Technical, Electrical & Communications, Inc. | 8FAE62F214 | Apprenticeship Sponsor | Jun 30, 2010 |
| Bethel, CT | Technology Investments LLC | 3603C2BAE4 | Apprenticeship Sponsor | Jun 30, 2008 |
| West Hartford, CT | Ted's Plumbing & Heating, Inc. | 9DF2F59929 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Manchester, CT | TEDDY'S OIL & ENERGY LLC | EE7324FFEF | Home Heating Fuel Dealer + 1 more | Sep 30, 2027 |
| Stamford, CT | Tedmar Electric Inc. | 1596C6D411 | Apprenticeship Sponsor | Jun 30, 2016 |
| Somers, CT | Teehan Electrical Services | F4CE79E4C9 | Apprenticeship Sponsor | Jun 30, 2016 |
| Niantic, CT | Telaid Industries, Inc. | C2DA3A5500 | Apprenticeship Sponsor | Jun 30, 2014 |
| Bridgeport, CT | Telenet Communications Inc. | 9EF638E407 | Apprenticeship Sponsor | Jun 30, 2021 |
| Southbury, CT | TELESCO ELECTRIC LLC | 6E5515602E | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Glastonbury, CT | TELEWORKS COMMUNICATIONS, INC. | 8DE7529E00 | Apprenticeship Sponsor | Jun 30, 2027 |
| Stamford, CT | Temp Air Co., Inc. | E06EC4BDA6 | Apprenticeship Sponsor | Jun 30, 2027 |
| Rocky Hill, CT | Temperature Technology Services, LLC | 2F6720EBCD | Apprenticeship Sponsor | Jun 30, 2006 |
| South Windsor, CT | Tempered Heating and Cooling | 1E8A744A54 | Apprenticeship Sponsor | Jun 30, 2026 |
| Broadbrook, CT | Tempered Heating and Cooling, LLC | 2C80CCE482 | Apprenticeship Sponsor | Jun 30, 2027 |
| East Hartford, CT | TempRite LLC | 50C27002AC | Apprenticeship Sponsor | Jun 30, 2009 |
| Danbury, CT | Tenesaca Electric, LLC | A946F6B430 | Apprenticeship Sponsor | Jun 30, 2026 |
| Higganum, CT | TERNULLO ELECTRIC, LLC | 142827FCB3 | Apprenticeship Sponsor | Jun 30, 2008 |
| New London, CT | Terry Associates | 9C278894BC | Apprenticeship Sponsor | Jun 30, 2018 |
| Griswold, CT | Tescis Communications, LLC | 6D24E4C007 | Apprenticeship Sponsor | Jun 30, 2006 |
| East Granby, CT | Tesla Energy | 89E05C7219 | Apprenticeship Sponsor | Jun 30, 2027 |
| Danbury, CT | Testa Refrigeration, LLC | B9CD54085A | Apprenticeship Sponsor | Jun 30, 2023 |
| Thompson, CT | Tewksbury Electric, LLC | DD554085B3 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Canterbury, CT | Thames Valley Fire Protection, LLC | 8B5F6624BB | Apprenticeship Sponsor | Jun 30, 2027 |
| Pawcatuck, CT | Thavenet Machine Company, Inc. | 49D857DB8D | Apprenticeship Sponsor | — |
| Groton, CT | ThayerMahan, Inc. | E10F1F0DB3 | Apprenticeship Sponsor | Jun 30, 2025 |
| Bloomfield, CT | The Able Electric Co., Inc. | 53EF55A628 | Apprenticeship Sponsor | Jun 30, 2027 |
| Bristol, CT | The Arthur G. Russell Co., Inc. | 7D1E7C0916 | Apprenticeship Sponsor | Jun 30, 2027 |
| Branford, CT | The Best Connections LLC | 23339B861B | Apprenticeship Sponsor | Jun 30, 2024 |
| North Haven, CT | The Boston Solar | 7D68A3C106 | Apprenticeship Sponsor | Jun 30, 2016 |
| Watertown, CT | THE CARBY CORPORATION | FD3FEAE630 | Apprenticeship Sponsor | Jun 30, 2027 |
| Chelsea, MA | The Chappy Corporation | 55280A644C | Apprenticeship Sponsor | Jun 30, 2018 |
| Ansonia, CT | The Clog Dr, LLC | C0E2097556 | Apprenticeship Sponsor | Jun 30, 2027 |
| Torrington, CT | The Colonial Bronze Company | 2F33797C7F | Apprenticeship Sponsor | Jun 30, 2027 |
| North Branford, CT | The Curly Hair Salon | 09853B1BB6 | Apprenticeship Sponsor | Jun 30, 2025 |
| New Haven, CT | The Curly Hair Salon | 345FA05760 | Apprenticeship Sponsor | Jun 30, 2027 |
| Ridgefield, CT | The Dapper Den Barbershop, LLC | 1DD0C69688 | Apprenticeship Sponsor | Jun 30, 2027 |
| Holyoke, MA | The Darcy Company | 8A34A3928D | Apprenticeship Sponsor | Jun 30, 2015 |
| Glastonbury, CT | The Electrician & Beth | CC7AAA6EE1 | Apprenticeship Sponsor | Jun 30, 2009 |
| Old Saybrook, CT | The Electricians, LLC | 4B39F08D1A | Apprenticeship Sponsor | Jun 30, 2022 |
| New Britain, CT | The Engel Company, Inc. | 21B03214AB | Apprenticeship Sponsor | Jun 30, 2012 |
| Bloomfield, CT | The Eugene Steinberg Co. | 87FD2B1AFA | Apprenticeship Sponsor | Jun 30, 2024 |
| Stratford, CT | The Fade Factory | 67482FC06A | Apprenticeship Sponsor | Jun 30, 2026 |
| Plainville, CT | The Field of Plumbing & Heating, LLC | 68CC3C143D | Apprenticeship Sponsor | Jun 30, 2020 |
| Vernon, CT | The Flint Family, LLC DBA Flint's Barbershop | 74E96999B2 | Apprenticeship Sponsor | Jun 30, 2020 |
| New London, CT | The Garside Group | C1BDBC1C8B | Apprenticeship Sponsor | — |
| Putnam, CT | The Gentleman’s Choice Barbershop | E99A649B4A | Apprenticeship Sponsor | Jun 30, 2026 |
| Gilman, CT | The Gilman Brothers Company | 307F4D9FFF | Apprenticeship Sponsor | Jun 30, 2021 |
| Bloomfield, CT | THE GREEN MACHINE, INC. | C102AEEDF0 | Pesticide Application Business Registration + 4 more | Aug 31, 2027 |
| Watertown, CT | The Ground Up Company | F0609EC626 | Apprenticeship Sponsor | Jun 30, 2020 |
| Chester, CT | The Guild, LLC | B879B1C1B0 | Apprenticeship Sponsor | — |
| Killingworth, CT | The Hair Loft | 0E4C932392 | Apprenticeship Sponsor | Jun 30, 2027 |
| Old Greenwich, CT | The Haircut Place | EE5385107E | Apprenticeship Sponsor | Jun 30, 2024 |
| Hartford, CT | The Hartford Courant Company, LLC | FE5FB8228D | Apprenticeship Sponsor | Jun 30, 2018 |
| Uncasville, CT | The Heat People, Inc. | ECDB0388B4 | Apprenticeship Sponsor | Jun 30, 2025 |
| Wallingford, CT | The L. R. Brown Mfg. Co., Inc. | 3193B5648C | Apprenticeship Sponsor | Jun 30, 2024 |
| Essex, CT | The Lee Company | CCD5528923 | Apprenticeship Sponsor | Jun 30, 2015 |
| Windsor, CT | The Loomis Chaffee School | E080CFFBB0 | Apprenticeship Sponsor + 1 more | Jun 30, 2024 |
| Newington, CT | The Lost Art Barbershop | AFD317206B | Apprenticeship Sponsor | Jun 30, 2024 |
| South Windsor, CT | THE MAIN CONNECTION OF CT LLC | DAC1EFEA9D | Apprenticeship Sponsor | Jun 30, 2027 |
| Middletown, CT | The Main Switch Beauty Salon | 65319D4F0D | Apprenticeship Sponsor | — |
| Waterford, CT | The Nasi Group LLC | DBD986A611 | Apprenticeship Sponsor | Jun 30, 2017 |
| Danbury, CT | THE NETWORK SUPPORT COMPANY | C9FE221EE7 | Apprenticeship Sponsor | Jun 30, 2014 |
| Westport, CT | THE O'DELL GROUP LLC | FCFFF5CA16 | New Home Construction Contractor + 2 more | Mar 31, 2027 |
| Danbury, CT | The Otto Company | B6DCCE26BC | Apprenticeship Sponsor | Jun 30, 2027 |
| Farmington, CT | The Paneloc Corp. | 58918730A7 | Apprenticeship Sponsor | Jun 30, 2023 |
| Thomaston, CT | The Petit Tool Co. | 1531854510 | Apprenticeship Sponsor | Jun 30, 2022 |
| Woodbridge, CT | The Plastic Forming Company, Inc. | 60944409F4 | Apprenticeship Sponsor | Jun 30, 2027 |
| Waterbury, CT | The Platt Brothers & Co. | 2CF7382276 | Apprenticeship Sponsor | Jun 30, 2024 |
| Norwalk, CT | The Plumbing Artisans | CADB75C203 | Apprenticeship Sponsor | Jun 30, 2023 |
| Cheshire, CT | The Quaker Corporation | D35479ADC7 | Apprenticeship Sponsor | Jun 30, 2027 |
| Rockfall, CT | The Rogers Manufacturing Company | D6FA0A1008 | Apprenticeship Sponsor | Jun 30, 2020 |
| Watertown, CT | The Sambrook Group, LLC | EF72245BAE | Apprenticeship Sponsor | Jun 30, 2021 |
| Bristol, CT | The Shaffer Co., LLC | 7E9F18A4B8 | Apprenticeship Sponsor | Jun 30, 2022 |
| Watertown, CT | The Siemon Company | D60F2F043F | Apprenticeship Sponsor | Jun 30, 2027 |
| Stonington, CT | The Stonington Community Center, Inc. | F23A3323D5 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Waterbury, CT | THE WAREHOUSE STORE FIXTURE CO INC | FA02CD89B2 | Dealer of Weighing & Measuring Devices + 1 more | Dec 31, 2026 |
| Southington, CT | The Winterberry Group | D699EDCAE1 | Apprenticeship Sponsor | Jun 30, 2021 |
| Enfield, CT | The Wiring Whiz, LLC | F37AB644BF | Apprenticeship Sponsor | Jun 30, 2027 |
| Bridgeport, CT | THE WORKPLACE INC | 71CC9CEC2F | Public Charity + 1 more | May 31, 2027 |
| Southington, CT | Thermal Works, LLC | 849F3E8798 | Apprenticeship Sponsor | Jun 30, 2027 |
| Stamford, CT | Thermo Care, LLC | ED3CDB1469 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Broadbrook, CT | Thermodynamics Mechanical Services, Inc. | DFEF654504 | Apprenticeship Sponsor | Jun 30, 2027 |
| Middletown, CT | Thermomedics, LLC | 8E868EBDE7 | Apprenticeship Sponsor | Jun 30, 2019 |
| East Windsor, CT | Thibodeau Electric Inc. | 17B98DCBDE | Apprenticeship Sponsor | Jun 30, 2008 |
| Coventry, CT | Thiffeault Plumbing & Heating, LLC | AE501CD3AB | Apprenticeship Sponsor | Jun 30, 2022 |
| Plainfield, CT | THOMAS BUFFINGTON ASSOCIATES INC | 1059F4CC53 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Milford, CT | Thomas Connolly Electrical Contractor | 703716226F | Apprenticeship Sponsor | Jun 30, 2027 |
| Bristol, CT | Thomas Electric Co. LLC | 51C6634FF4 | Apprenticeship Sponsor | Jun 30, 2025 |
| East Granby, CT | Thomas Nigro & Son Plumbing, LLC | 20A827D20D | Apprenticeship Sponsor | Jun 30, 2024 |
| Berlin, CT | Thomas Oil Co. | D3AC67060B | Apprenticeship Sponsor | Jun 30, 2020 |
| Westport, CT | Thomas R. Sottile, Inc. | 6BFC8B9828 | Apprenticeship Sponsor | Jun 30, 2018 |
| Norwalk, CT | Thomas Ross & Son | CC7FFC4012 | Apprenticeship Sponsor | Jun 30, 2008 |
| Thomaston, CT | THOMASTON COMFORT CONTROL INC. | AE09D6CB3B | Apprenticeship Sponsor + 2 more | Jun 30, 2027 |
| Thomaston, CT | Thomaston Electrical Contractors | 630CDAC8A3 | Apprenticeship Sponsor | Jun 30, 2025 |
| Thomaston, CT | Thomaston Metalworks LLC | 2556C0AFA6 | Apprenticeship Sponsor | Jun 30, 2026 |
| Quinebaug, CT | Thompson Electric | 7F5734D434 | Apprenticeship Sponsor | Jun 30, 2010 |
| Riverside, CT | THOMPSON HEATING & AIR CONDITIONING | D73C1AB76C | Apprenticeship Sponsor | Jun 30, 2027 |
| Enfield, CT | Thompsonville Electric | E926B387F9 | Apprenticeship Sponsor | Jun 30, 2010 |
| Enfield, CT | Thorogood Electric, LLC | AABE1B2FA0 | Apprenticeship Sponsor | Jun 30, 2027 |
| Stamford, CT | Three J's Electric | 10DB39FAD4 | Apprenticeship Sponsor | Jun 30, 2005 |
| Norwalk, CT | Three Phase Electric, LLC | 5C6B38367B | Apprenticeship Sponsor | Jun 30, 2022 |
| Windsor Locks, CT | Three-Way Communications, Inc. | 7C93715446 | Apprenticeship Sponsor | Jun 30, 2027 |
| Bethel, CT | Thrive Brands, LLC DBA Teed & Brown | 7866BDC535 | Pesticide Application Business Registration + 1 more | Aug 31, 2027 |
| Naugatuck, CT | THURSTON ENERGY | F1A2F821BB | Home Heating Fuel Dealer + 2 more | Sep 30, 2027 |
| Waterbury, CT | Thurston's Heating & Cooling LLC | AAF389D1EA | Apprenticeship Sponsor | Jun 30, 2011 |
| Meriden, CT | TI Automotive | 5C8B8678C5 | Apprenticeship Sponsor | Jun 30, 2005 |
| New Britain, CT | Tiadora Plumbing & Heating | D31957335B | Apprenticeship Sponsor | Jun 30, 2007 |
| Redding, CT | Tibor Vig Electric LLC | F6B755459B | Apprenticeship Sponsor | Jun 30, 2015 |
| South Windsor, CT | Ticketnetwork | B3EB9A7625 | Apprenticeship Sponsor | Jun 30, 2026 |
| East Norwalk, CT | TIDEWATER ELECTRONICS, INC. | A17BFDDA90 | Apprenticeship Sponsor | Jun 30, 2027 |
| Newtown, CT | Tier One, LLC | 7673EF92F3 | Apprenticeship Sponsor | Jun 30, 2021 |
| Cobalt, CT | Tierney Electric, Inc. | 5C06A19CF5 | Apprenticeship Sponsor | Jun 30, 2026 |
| Danbury, CT | Tiger Electric Co. | A05BFAC7F0 | Apprenticeship Sponsor | Jun 30, 2017 |
| Southbury, CT | Tiger Technologies, LLC dba USA LED | AB7E0BE6B0 | Apprenticeship Sponsor | Jun 30, 2023 |
| Portland, CT | Tigersun Services Inc. dba: GC National | CC9C3513E7 | Apprenticeship Sponsor | Jun 30, 2026 |
| New Britain, CT | TILCON CONNECTICUT INC | EF46729862 | Major Contractor + 2 more | Jun 30, 2027 |
| Southbury, CT | Tim Conlan Company, LLC | 872DF70434 | Apprenticeship Sponsor | Jun 30, 2024 |
| South Glastonbury, CT | Timeline Irrigation, LLC | A97B97EE1F | Apprenticeship Sponsor | Jun 30, 2013 |
| Watertown, CT | Timken Corporation | FEACF486B5 | Apprenticeship Sponsor | Jun 30, 2007 |
| Niantic, CT | TIMOTHY MAHONEY PLUMBING | 13F4A40043 | Apprenticeship Sponsor | Jun 30, 2027 |
| West Haven, CT | Tin Knocker Duct Systems, LLC | 7D5A0391F5 | Apprenticeship Sponsor | Jun 30, 2008 |
| Middletown, CT | Tin Man Mechanical & Building Services, LLC | 74F543F8DD | Apprenticeship Sponsor | — |
| Windsor, CT | Tin Works Inc. | 1A6C14FF91 | Apprenticeship Sponsor | Jun 30, 2007 |
| Rocky Hill, CT | TineDale Corporation | FE92AA8A27 | Apprenticeship Sponsor | Jun 30, 2027 |
| Tolland, CT | Tinsley Heating and Cooling LLC | 4CAA907D51 | Apprenticeship Sponsor | Jun 30, 2026 |
| Norwalk, CT | Titan Electric LLC | 73D007E116 | Apprenticeship Sponsor | Jun 30, 2023 |
| Cheshire, CT | Titan Electrical Services, LLC | DB856F87F8 | Apprenticeship Sponsor | Jun 30, 2015 |
| Manchester, CT | Titan Mechanical Contractors, Inc. | 1844D4EBE9 | Apprenticeship Sponsor | Jun 30, 2008 |
| Norwalk, CT | Titanium Electric, LLC | 90D7263D34 | Apprenticeship Sponsor | Jun 30, 2027 |
| Willington, CT | TJF ELECTRIC LLC | 9DF878743B | Apprenticeship Sponsor | Jun 30, 2027 |
| Enfield, CT | TJN Properties, LLC | 2E7685C4B9 | Apprenticeship Sponsor | Jun 30, 2025 |
| Oxford, CT | TLC Electric, LLC | 60A3D43349 | Apprenticeship Sponsor | Jun 30, 2027 |
| Trumbull, CT | TLC Plumbing LLC | 1CC957D7AC | Apprenticeship Sponsor | Jun 30, 2027 |
| Bristol, CT | TM Electric, LLC | F5DFD48A9D | Apprenticeship Sponsor | Jun 30, 2027 |
| Mystic, CT | TMG COMPANIES LLC TMG PLUMBING & DISASTER SOLUTIONS | 8CAF3FEBE0 | Major Contractor + 2 more | Jun 30, 2027 |
| Colchester, CT | TNT Heating & Cooling, LLC | 049346799D | Apprenticeship Sponsor | Jun 30, 2027 |
| Litchfield, CT | TNT Refrigeration LLC | 5C9D1073D3 | Apprenticeship Sponsor | Jun 30, 2021 |
| Windsor Locks, CT | Tobacco Valley Electric, LLC | 777BF4877C | Apprenticeship Sponsor | Jun 30, 2028 |
| Oxford, CT | TOIGO HVAC, LLC | 8A6941F348 | Apprenticeship Sponsor | Jun 30, 2025 |
| Wallingford, CT | Tolla Electrical Contracting LLC | 752436E040 | Apprenticeship Sponsor | Jun 30, 2011 |
| Seymour, CT | TOM BALLARO PLUMBING | 5D3E420C03 | Apprenticeship Sponsor | Jun 30, 2027 |
| Griswold, CT | Tom Buehler Plumbing | AA44DE30B1 | Apprenticeship Sponsor | Jun 30, 2017 |
| Naugatuck, CT | Tom Gleason Electric | 63A2F0A46E | Apprenticeship Sponsor | Jun 30, 2021 |
| Prospect, CT | Tom Lawlor & Sons Construction, LLC | ECD1FAB74E | Apprenticeship Sponsor | Jun 30, 2024 |
| Enfield, CT | Tom's Advanced Plumbing & Heating LLC | 1179B7C3D7 | Apprenticeship Sponsor | Jun 30, 2022 |
| Gales Ferry, CT | TOM'S PLUMBING & HEATING | BDBE89B459 | Apprenticeship Sponsor | Jun 30, 2027 |
| Norwalk, CT | Tomas Electric, LLC | 58AF05CDB9 | Apprenticeship Sponsor | Jun 30, 2027 |
| Bantam, CT | Tomascak Plumbing LLC | 55D2BFC2D5 | Apprenticeship Sponsor | Jun 30, 2020 |
| Rocky Hill, CT | Tomasino Electric | 668CD6DD88 | Apprenticeship Sponsor | Jun 30, 2014 |
| Waterford, CT | Tomaszek & Sons Plumbing, Heating & Pumps | 57F19A6170 | Apprenticeship Sponsor | Jun 30, 2012 |
| East Lyme, CT | TOMASZEK & SONS PLUMBING, HEATING & PUMPS, LLC | 8C16AC0A7E | Apprenticeship Sponsor | Jun 30, 2027 |
| Portland, CT | Tomaszewski Electric, LLC | BFBAA1F441 | Apprenticeship Sponsor | Jun 30, 2006 |
| Orange, CT | Tomax, LLC (DBA: Tomax Heating & Cooling) | D5D41E641E | Apprenticeship Sponsor | Jun 30, 2019 |
| Fairfield, CT | Tomis Electrical Contractors, LLC | 913416A70D | Apprenticeship Sponsor | Jun 30, 2019 |
| Ledyard, CT | Tomis Landscape Company | 23FC168B89 | Apprenticeship Sponsor | Jun 30, 2011 |
| Glastonbury, CT | Tommy's Oil Inc. | 9C64686F37 | Apprenticeship Sponsor | Jun 30, 2013 |
| Old Saybrook Ct, CT | Tone Klear Communication | F37CDC5974 | Apprenticeship Sponsor | Jun 30, 2027 |
| New Fairfield, CT | Tony Morelli LLC | 12F277D65A | Apprenticeship Sponsor | Jun 30, 2027 |
| Middlebury, CT | Tony's Plumbing and Heating LLC | 2AA9962D7C | Apprenticeship Sponsor | Jun 30, 2023 |
| Ashford, CT | TOOLMAX DESIGNING & TOOLING, INC. | F2640684CC | Apprenticeship Sponsor | Jun 30, 2026 |
| Deep River, CT | Top Notch Electrical Services, LLC | 97C81BB63B | Apprenticeship Sponsor | Jun 30, 2024 |
| Plainville, CT | TOP NOTCH MECHANICAL, LLC | 866695DF17 | Apprenticeship Sponsor | Jun 30, 2020 |
| Windsor Locks, CT | TOP TIER FUEL LLC | 30B85599D0 | Home Heating Fuel Dealer + 2 more | Sep 30, 2027 |
| East Hartford, CT | TOP-TIER-TEMPS, LLC | 069C1ECFDA | Apprenticeship Sponsor | Jun 30, 2025 |
| Danbury, CT | Topfield Electric, LLC | 223904D897 | Apprenticeship Sponsor | Jun 30, 2014 |
| Waterbury, CT | TORRES INTERIORS LLC | 00F288CAC1 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Torrington, CT | Torrington Public Schools | A81A9A47EB | Apprenticeship Sponsor | Jun 30, 2027 |
| North Branford, CT | Total Comfort Control | 0463DA0348 | Apprenticeship Sponsor | Jun 30, 2023 |
| Ledyard, CT | Total Comfort Mechanical Systems LLC | 2C5F8A6122 | Apprenticeship Sponsor | Jun 30, 2016 |
| Danbury, CT | TOTAL COMFORT, INC. | 0045A4C81B | Apprenticeship Sponsor | Jun 30, 2027 |
| East Hartford, CT | Total Communication, Inc. | 21E5CE6BAE | Apprenticeship Sponsor | Jun 30, 2017 |
| North Branford, CT | Total Electric Inc. | 525EA260F4 | Apprenticeship Sponsor | Jun 30, 2027 |
| Wolcott, CT | Total Energy Electric, Inc. | 09C98DC4D9 | Apprenticeship Sponsor | Jun 30, 2014 |
| Elmsford, NY | Total Fuel Serices Corp. | A914893865 | Apprenticeship Sponsor | Jun 30, 2010 |
| Plainville, CT | TOTAL MECHANICAL SYSTEMS LLC | CEC01F2C29 | Apprenticeship Sponsor | Jun 30, 2027 |
| Farmington, CT | Total Mechanical, LLC | 0F37CE465A | Apprenticeship Sponsor | Jun 30, 2004 |
| Woodbury, CT | Total Parts Services, LLC | 23F4ED151D | Apprenticeship Sponsor | — |
| East Haven, CT | TOTAL PLUMBING & HEATING INC | 626D247AA2 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Enfield, CT | Total Protection Security Systems, LLC | F66C82D85E | Apprenticeship Sponsor | Jun 30, 2025 |
| West Suffield, CT | Total Refrigeration | C712B0AAC8 | 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.