Apprenticeship Sponsor — page 16 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 |
|---|---|---|---|---|
| Wallingford, CT | RB Enterprises | 9D950D3512 | Apprenticeship Sponsor | Jun 30, 2019 |
| Torrington, CT | RBC Aircraft Products, Inc. | 5C4E355C38 | Apprenticeship Sponsor | Jun 30, 2027 |
| Oxford, CT | RBC Bearings-Engineered Components | 6FAE466AC4 | Apprenticeship Sponsor | Jun 30, 2022 |
| Beacon Falls, CT | RC Electrical Contractors, LLC | D91EF43CB8 | Apprenticeship Sponsor | Jun 30, 2022 |
| Newington, CT | RCI Electrical Contractors Inc. | 0E9B70619A | Apprenticeship Sponsor | Jun 30, 2005 |
| Wallingford, CT | RCMS Controls, Inc. | E7BEA62A39 | Apprenticeship Sponsor | Jun 30, 2010 |
| Bridgeport, CT | RCR Electrical | A248C92376 | Apprenticeship Sponsor | Jun 30, 2013 |
| Stamford, CT | RD Mechanical LLC | 7175EE88F5 | Apprenticeship Sponsor | Jun 30, 2019 |
| Bethany, CT | RDC Sheet Metal Company | 60E9F03E10 | Apprenticeship Sponsor | Jun 30, 2016 |
| Port Chester, NY | RDD Homes LLC DBA Grandview Electric | 1F515D4EBE | Apprenticeship Sponsor | Jun 30, 2027 |
| Madison, CT | RDI Electric | D9E00FFB76 | Apprenticeship Sponsor | Jun 30, 2009 |
| Stratford, CT | RDR Air, LLC | 6EA08D898D | Apprenticeship Sponsor | Jun 30, 2026 |
| Terryville, CT | RDS ELECTRIC LLC | 8031A1BC3A | Apprenticeship Sponsor | Jun 30, 2026 |
| New Canaan, CT | Ready Plumbing | C04A6623D8 | Apprenticeship Sponsor | Jun 30, 2023 |
| Bloomfield, CT | Real Goods Energy Tech Inc. | EAF7532065 | Apprenticeship Sponsor | Jun 30, 2020 |
| Stonington, CT | Real Goods Solar | 961CA35C7A | Apprenticeship Sponsor | Jun 30, 2016 |
| Brooklyn, CT | Reali Plumbing & Heating, LLC | D64F0F7261 | Apprenticeship Sponsor | Jun 30, 2008 |
| Katonan, NY | Rebel Heating & Cooling Corporation | 61AB10E031 | Apprenticeship Sponsor | Jun 30, 2024 |
| Waterbury, CT | REBELO ELECTRIC, LLC | 50B0231F8C | Apprenticeship Sponsor | Jun 30, 2027 |
| Watertown, CT | REBERS PLUMBING & HEATING, INC. | EA0F55C1FD | Apprenticeship Sponsor | Jun 30, 2025 |
| Burlington, CT | REC Electric LLC | B82A1A70BA | Apprenticeship Sponsor | Jun 30, 2017 |
| Stafford Springs, CT | Red Balloon Day Care Center Inc | D0CCB098AE | Apprenticeship Sponsor | Jun 30, 2027 |
| North Haven, CT | Red Hawk Fire & Security, LLC | B98259B1B8 | Apprenticeship Sponsor | Jun 30, 2020 |
| East Hartford, CT | Red Thread | B69E7E9B06 | Apprenticeship Sponsor | Jun 30, 2027 |
| Redding, CT | redding electrical | D7F474FF7A | Apprenticeship Sponsor | Jun 30, 2027 |
| Redding, CT | Redding Ridge Electric, LLC | C4D98CA989 | Apprenticeship Sponsor | Jun 30, 2025 |
| Coventry, CT | Redshaw Electric, LLC | 01F9D6FFF6 | Apprenticeship Sponsor | Jun 30, 2014 |
| Southington, CT | Reed Mechanical Solutions, LLC | 53F2C0266E | Apprenticeship Sponsor | Jun 30, 2027 |
| Sherman, CT | Reed Plumbing & Heating Services, LLC | 81C2561BB9 | Apprenticeship Sponsor | Jun 30, 2025 |
| West Haven, CT | Refrigeration Unlimited, Inc. | 04FC7522B4 | Apprenticeship Sponsor | Jun 30, 2016 |
| Higganum, CT | REGIONAL SCHOOL DIST #17 HADDAM-KILLINGWORTH | A83EBF84F0 | Apprenticeship Sponsor | Jun 30, 2027 |
| Milford, CT | Regional Solar Installations, LLC | AD311787E5 | Apprenticeship Sponsor | Jun 30, 2017 |
| South Easton, MA | Reilly Electrical Contractors, Inc. | 02E8CA1762 | Apprenticeship Sponsor | Jun 30, 2017 |
| Shelton, CT | Reilly Mechanical | E662440DAE | Apprenticeship Sponsor | Jun 30, 2027 |
| Ansonia, CT | Reliable Air Systems LLC | 7711B19622 | Apprenticeship Sponsor | Jun 30, 2027 |
| Woodbridge, CT | Reliable Air Systems, LLC | F4D410F1ED | Apprenticeship Sponsor | Jun 30, 2011 |
| Hamden, CT | Reliable Detection System's, LLC | E457D3BC10 | Apprenticeship Sponsor | Jun 30, 2011 |
| Middlebury, CT | Reliable Electric | 5B93B7F064 | Apprenticeship Sponsor | Jun 30, 2027 |
| Hartford, CT | Reliable Electric Motor, Inc. | 9951ED2246 | Apprenticeship Sponsor | Jun 30, 2026 |
| South Glastonbury, CT | Reliable Electrical Contractor, Inc. | 56D873825E | Apprenticeship Sponsor | Jun 30, 2011 |
| Wallingford, CT | Reliable Heating & Cooling, LLC | 152E79E23D | Apprenticeship Sponsor | Jun 30, 2005 |
| Brookfield, CT | Reliable Heating, LLC | 6B75553759 | Apprenticeship Sponsor | Jun 30, 2024 |
| Hartford, CT | Reliable Mechanical Contractors LLC | DC54C40D6E | Apprenticeship Sponsor | Jun 30, 2006 |
| Stamford, CT | Reliable Oil & Heat Co. Inc. | 0F0CF42AAE | Apprenticeship Sponsor | Jun 30, 2027 |
| Colchester, CT | Reliable Oil, LLC | 25FE0C5709 | Apprenticeship Sponsor | Jun 30, 2015 |
| East Hartland, CT | Reliable Plumbing & Pump Service | 7972B8DF9F | Apprenticeship Sponsor | Jun 30, 2014 |
| New Britain, CT | Reliable Protective Service Inc. | 53C123C47B | Apprenticeship Sponsor | Jun 30, 2006 |
| Hamden, CT | RELIABLE REFRIGERATION PLUS, INC. | 9BBB7E00A6 | Apprenticeship Sponsor | Jun 30, 2027 |
| Naugatuck, CT | Reliable Silver Corp. | 79340C8EF9 | Apprenticeship Sponsor | Jun 30, 2026 |
| Bristol, CT | Reliable Spring & Stamping, LLC | 1505563118 | Apprenticeship Sponsor | Jun 30, 2021 |
| Milford, CT | Reliable Tool & Die Inc. | A530586315 | Apprenticeship Sponsor | Jun 30, 2023 |
| Newington, CT | Reliance Mechanical, LLC | 76F08D1E7C | Apprenticeship Sponsor | Jun 30, 2020 |
| Old Lyme, CT | Reliant Electric Co. LLC | 0DE7D875BC | Apprenticeship Sponsor | Jun 30, 2023 |
| Bridgeport, CT | Remington Products Company, L.L.C. | 8CF0CDD472 | Apprenticeship Sponsor | Jun 30, 2004 |
| Sutton, MA | Renaud Electrical & Communications, Inc. | EAA8F9D855 | Apprenticeship Sponsor | Jun 30, 2016 |
| Putnam, CT | Renchel Tool, Inc. | C5C8F1AD60 | Apprenticeship Sponsor | Jun 30, 2020 |
| Stamford, CT | Renewable Resources Energy Solutions | D527710121 | Apprenticeship Sponsor | Jun 30, 2013 |
| Salem, CT | Renn. Co. Plumbing and Heating | D02B3426AA | Apprenticeship Sponsor | Jun 30, 2026 |
| New London, CT | Renshaw Construction | 4C8FEC3D63 | Apprenticeship Sponsor | Jun 30, 2023 |
| New London, CT | Renshaw Plumbing, Heating & Cooling, LLC | 6A009FFE16 | Apprenticeship Sponsor | Jun 30, 2027 |
| Milford, CT | Renz Heating and Air Conditioning, LLC | 0F177322C0 | Apprenticeship Sponsor | Jun 30, 2022 |
| Bethel, CT | Renz Plumbing & Heating, Inc. | 220BBE8EB2 | Apprenticeship Sponsor | Jun 30, 2027 |
| Stratford, CT | Repko Electric | 29326290E8 | Apprenticeship Sponsor | Jun 30, 2016 |
| Danbury, CT | Resourceone | 7B68927063 | Apprenticeship Sponsor | Jun 30, 2019 |
| Norwalk, CT | Restorations Unlimited, LLC | FABAF1A77E | Apprenticeship Sponsor | Jun 30, 2013 |
| Ellington, CT | REUTTER MECHANICAL, LLC | 20EB87F274 | Apprenticeship Sponsor | Jun 30, 2027 |
| Meriden, CT | REVOLUTION ELECTRICAL CONTRACTORS LLC | CBFDFA8621 | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Torrington, CT | Rexam Cosmetic Packaging, Inc. | C4CAE0E597 | Apprenticeship Sponsor | Jun 30, 2004 |
| Thomaston, CT | Reynolds Carbide Die Co., Inc. | 8DC4564F0C | Apprenticeship Sponsor | — |
| Auburn, MA | RH White Construction Co., Inc. | B87E70DC01 | Apprenticeship Sponsor | Jun 30, 2027 |
| Simsbury, CT | Rhenium Salon and Spa | 2B79144695 | Apprenticeship Sponsor | Jun 30, 2027 |
| Guilford, CT | Rhodes Pump Service, LLC | 1C5AF5C91D | Apprenticeship Sponsor | Jun 30, 2027 |
| Torrington, CT | Rich Carlson Heating & Cooling LLC | CFA9E906A2 | Apprenticeship Sponsor | Jun 30, 2026 |
| Shelton, CT | Rich Plumbing & Heating, LLC | B8760CA9B9 | Apprenticeship Sponsor | Jun 30, 2010 |
| Enfield, CT | Rich's Plumbing, Heating & A/C | 3B1BD01794 | Apprenticeship Sponsor | Jun 30, 2027 |
| Terryville, CT | Richard Belonick Plumbing | 72DD0702B1 | Apprenticeship Sponsor | Jun 30, 2025 |
| Putnam, CT | Richard Electric Inc. | 646EC850A8 | Apprenticeship Sponsor | Jun 30, 2027 |
| Milford, CT | Richard Manufacturing Company, Inc. | BC3C90CF35 | Apprenticeship Sponsor | — |
| New Milford, CT | RICHARD T LAYTON CO LTD | 0F2C72CD96 | Home Heating Fuel Dealer + 2 more | Sep 30, 2027 |
| Newington, CT | RICHARD'S MACHINE TOOL CO., INC. | 32779E8C03 | Apprenticeship Sponsor | Jun 30, 2027 |
| Terryville, CT | RICHARDS CORPORATION | 17C6428F30 | Major Contractor + 4 more | Jun 30, 2027 |
| Stamford, CT | Richards Electrical Contractors | 3EC40FF906 | Apprenticeship Sponsor | Jun 30, 2006 |
| Wolcott, CT | Richards Metal Products, Inc. | 2CB0BA58BF | Apprenticeship Sponsor | Jun 30, 2005 |
| Hebron, CT | Richie's Electric LLC | 0DA165EB88 | Apprenticeship Sponsor | Jun 30, 2008 |
| Shelton, CT | Rick Sekelsky Plumbing and Heating | 41AB0BBF75 | Apprenticeship Sponsor | — |
| Milford, CT | Rick's Plumbing Service, Inc. | 917CE9D31E | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Redding, CT | Rick's Pump & Water Service, LLC | 73246576AD | Apprenticeship Sponsor | Jun 30, 2027 |
| North Haven, CT | Riddick's Electrical Services LLC | C93B028531 | Apprenticeship Sponsor | Jun 30, 2026 |
| Ridgefield, CT | RIDGEFIELD ELECTRIC, LLC | 0E611CC4B0 | Apprenticeship Sponsor | Jun 30, 2027 |
| Ridgefield, CT | Ridgefield Plumbing & Heating, LLC | 0836F2B226 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Portland, CT | Ridgeline Electric, LLC | C09D8891A3 | Apprenticeship Sponsor | — |
| Canaan, CT | RIGA CONSTRUCTION LLC | 623C204974 | New Home Construction Contractor + 2 more | Mar 31, 2027 |
| Canton, CT | Riiska Electric Company | 27B785453C | Apprenticeship Sponsor | Jun 30, 2013 |
| Canton Center, CT | Riiska Electrical Contractors, LLC | 8C445AFB2A | Apprenticeship Sponsor | Jun 30, 2026 |
| Botsford, CT | Rikki Electric Inc. | 1359CF7F68 | Apprenticeship Sponsor | Jun 30, 2008 |
| Windsor Locks, CT | Riley Electrical LLC | FC158480A0 | Apprenticeship Sponsor | Jun 30, 2024 |
| Colchester, CT | Riley Electrical Services LLC | 30453DBC67 | Apprenticeship Sponsor | Jun 30, 2015 |
| Kensington, CT | Riley Plumbing & Heating Co., Inc. | BF96D9199B | Apprenticeship Sponsor | Jun 30, 2021 |
| New Milford, CT | Riley's Heating Air Conditioning, LLC | 73E069C778 | Apprenticeship Sponsor | Jun 30, 2022 |
| North Stonington, CT | Riley's Heating Service | 590AED75F3 | Apprenticeship Sponsor | Jun 30, 2027 |
| Rocky Hill, CT | Rinaldi Electric | 264AFF66B7 | Apprenticeship Sponsor | Jun 30, 2012 |
| Waterbury, CT | Rinaldi Plumbing & Heating | 8BB10C0172 | Apprenticeship Sponsor | Jun 30, 2011 |
| Manchester, CT | Rising Star Plumbing LLC | 119E16EC67 | Apprenticeship Sponsor | Jun 30, 2011 |
| South Windsor, CT | Ritchie Mechanical Services, LLC DBA Advanced Heating & Air Conditioning | 2E0656436A | Apprenticeship Sponsor | Jun 30, 2027 |
| Burlington, CT | Rivco Construction, LLC | E14D546520 | Apprenticeship Sponsor | Jun 30, 2022 |
| Chester, CT | Riveira Electric Inc. | 0E1F2015F4 | Apprenticeship Sponsor | Jun 30, 2010 |
| Lisbon, Ct, CT | River Electric LLC | DC1E5C7298 | Apprenticeship Sponsor | Jun 30, 2027 |
| Chester, CT | River Valley Electric, LLC | EA1A2B082A | Apprenticeship Sponsor | Jun 30, 2026 |
| East Hartford, CT | Rivermead Inc. | 26CDA43F23 | Apprenticeship Sponsor | Jun 30, 2012 |
| Norwalk, CT | Rizzo Benincaso Electrical Contractors, Inc. | 223BAB71EC | Apprenticeship Sponsor | Jun 30, 2006 |
| Derby, CT | RJL Electric Corporation | FFC34F779D | Apprenticeship Sponsor | Jun 30, 2008 |
| Cheshire, CT | RK Electric, LLC | DDFC4619FA | Apprenticeship Sponsor | Jun 30, 2015 |
| Killingworth, CT | RLD Heating & Cooling, Inc. | 739EF86BA6 | Apprenticeship Sponsor | Jun 30, 2025 |
| Durham, CT | RLI ELECTRIC, LLC | 0EAB23B121 | Apprenticeship Sponsor | Jun 30, 2027 |
| Torrington, CT | RMF Heating & Cooling LLC | 7868BA7190 | Apprenticeship Sponsor | Jun 30, 2010 |
| Manchester, CT | RMS Electrical Contractors LLC | A5861B7D35 | Apprenticeship Sponsor | Jun 30, 2009 |
| Oxford, CT | RNB ENTERPRISES INC | E1C75171CB | Tv & Radio Dealer + 2 more | Aug 31, 2027 |
| East Hartford, CT | RO'S PLUMBING LLC | 4D81811F20 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Bethel, CT | Ro-Tam Sheetmetal Company | 973879BBA1 | Apprenticeship Sponsor | Jun 30, 2009 |
| Enfield, CT | Rob Roy Electric, LLC | 6F4E5206A1 | Apprenticeship Sponsor | Jun 30, 2019 |
| Sandy Hook, CT | Rob Rozz LLC | 1C698EC46D | Apprenticeship Sponsor | Jun 30, 2027 |
| Plainville, CT | Roberge Plumbing, Inc. | 78D1B8708B | Apprenticeship Sponsor | Jun 30, 2023 |
| Salisbury, CT | Robert A. Smith, Jr. Electrical Work | 034DF3D7C7 | Apprenticeship Sponsor | Jun 30, 2011 |
| Niantic, CT | Robert Cassidy Jr. Plumbing & Heating, Inc. | B06E26E21E | Apprenticeship Sponsor | Jun 30, 2011 |
| Manchester, CT | Robert Damaschi Electrical Contractor | 9A8E660A38 | Apprenticeship Sponsor | Jun 30, 2014 |
| Windsor Locks, CT | Robert G. Heim Company | 68FAF22EFA | Apprenticeship Sponsor | Jun 30, 2005 |
| Waterford, CT | Robert Giusti Plumbing & Heating | DDC50BA21A | Apprenticeship Sponsor | Jun 30, 2027 |
| Manchester, CT | Robert J. Bonino Electric | 638901859E | Apprenticeship Sponsor | Jun 30, 2025 |
| Stamford, CT | Robert J. Boucher Jr. Plumbing & Heating, LLC | CCEA42D9FD | Apprenticeship Sponsor | Jun 30, 2027 |
| Norwalk, CT | Robert Riith, Jr. Plumbing & Heating Inc. | 0F8515B0F6 | Apprenticeship Sponsor | Jun 30, 2007 |
| Riverside, CT | Robert Rozmus Plumbing & Heating, Inc. | F1DC87C3D2 | Apprenticeship Sponsor | Jun 30, 2027 |
| Milford, CT | Robert Simone LLC | D44F9DFAA2 | Apprenticeship Sponsor | Jun 30, 2028 |
| Norwalk, CT | Robert W. Geitz | 857D1758DB | Apprenticeship Sponsor | Jun 30, 2004 |
| Somers, CT | Roberts Air | 2E02486A92 | Apprenticeship Sponsor | Jun 30, 2021 |
| New London, CT | Roberts Audio Video | 2A25059FC3 | Apprenticeship Sponsor | Jun 30, 2011 |
| Waterbury, CT | Roberts Electric | C8343B9C6F | Apprenticeship Sponsor | Jun 30, 2023 |
| Waterbury, CT | Roberts Electrical LLC | E691547E26 | Apprenticeship Sponsor | Jun 30, 2023 |
| Danbury, CT | Robin Brundage Electrical Contractor, Inc. | 106178136F | Apprenticeship Sponsor | Jun 30, 2020 |
| Greenwich, CT | Robinson Electric, Inc. | 02B087C29C | Apprenticeship Sponsor | Jun 30, 2013 |
| Rocky Hill, CT | ROCAMORA ACQUISITIONS LLC | AE558C5045 | New Home Construction Contractor + 2 more | Mar 31, 2027 |
| Cos Cob, CT | Rocco Kohut Electrical Installations & Repairs, LLC | 1925FC3FD0 | Apprenticeship Sponsor | Jun 30, 2015 |
| Stamford, CT | Rocco Water Systems, Incorporated | 69E920AFC4 | Apprenticeship Sponsor | Jun 30, 2013 |
| South Windsor, CT | Rocco's Plumbing & Heating, LLC | 5F7CD3729E | Apprenticeship Sponsor | Jun 30, 2025 |
| Plantsville, CT | Rochefort's Heating & Air Conditioning, Inc. | 8E32C1D5E1 | Apprenticeship Sponsor | Jun 30, 2011 |
| Tolland, CT | ROCK-VERN ELECTRIC INC. | 79E56A138B | Apprenticeship Sponsor | Jun 30, 2022 |
| Meriden, CT | Rockfall Company, The | ED597BA69D | Apprenticeship Sponsor | Jun 30, 2012 |
| Rocky Hill, CT | Rocky Hill Electric | 0E916F5F35 | Apprenticeship Sponsor | Jun 30, 2018 |
| Rocky Hill, CT | Rocky Hill Oil & Transport & Towing | B629FD9933 | Apprenticeship Sponsor | Jun 30, 2006 |
| Southbury, CT | Rodger Craig Pump & Well Service LLC | 5241C241F2 | Apprenticeship Sponsor | Jun 30, 2016 |
| Danbury, CT | Rodrigues Electric LLC | FC14BCB7B9 | Apprenticeship Sponsor | Jun 30, 2008 |
| Old Lyme, CT | Roger Crampton, LLC | E973B668ED | Apprenticeship Sponsor | Jun 30, 2027 |
| Danbury, CT | Roger Electric, Inc. | 93BDFC71B1 | Apprenticeship Sponsor | Jun 30, 2027 |
| Enfield, CT | Rogers Heating & Air Conditioning | 05C35D62E4 | Apprenticeship Sponsor | Jun 30, 2027 |
| Granby, CT | Rolin-Rooter Inc. | 70BA3BD6E3 | Apprenticeship Sponsor | Jun 30, 2006 |
| Stamford, CT | Rollease Acmeda, Inc. | 4926CC77F5 | Apprenticeship Sponsor | Jun 30, 2021 |
| Middlebury, CT | Roller Bearing Co. of America, Inc. dba: PIC Design | D8829194FA | Apprenticeship Sponsor | Jun 30, 2021 |
| Tolland, CT | Roman Electric LLC | 21D60B5ABF | Apprenticeship Sponsor | Jun 30, 2025 |
| Meriden, CT | ROMAN OIL CO | EEFEABECAE | Home Heating Fuel Dealer + 2 more | Sep 30, 2027 |
| Danbury, CT | Romano Heating & Cooling, LLC | 23B3B049A4 | Apprenticeship Sponsor | Jun 30, 2018 |
| Bristol, CT | Romar Electric Co., LLC | D4880144F9 | Apprenticeship Sponsor | Jun 30, 2012 |
| Southbury, CT | Romatic Manufacturing I, LLC | B04FBE9D68 | Apprenticeship Sponsor | Jun 30, 2017 |
| Bloomfield, CT | Romco Contractors, Inc. | 0C5F6CE6DC | Apprenticeship Sponsor | Jun 30, 2027 |
| Milford, CT | Rome Fastener Corporation | 7ECD653C04 | Apprenticeship Sponsor | Jun 30, 2024 |
| Killingworth, CT | Ron Imbriglio | 470A55C4F4 | Apprenticeship Sponsor | Jun 30, 2017 |
| Madison, CT | Ron M. McGlinchey Plumbing & Heating INC | ED584DEBFF | Apprenticeship Sponsor | Jun 30, 2007 |
| Shelton, CT | Ron Rich Jr. Plumbing & Heating, LLC | 9EBE2F0613 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Stafford Springs, CT | Ron's Plumbing | 7DAC13F871 | Apprenticeship Sponsor | Jun 30, 2014 |
| Canaan, CT | Ronald E. Carpenter, Electrical Contractor | EDBEC670A5 | Apprenticeship Sponsor | Jun 30, 2027 |
| Danbury, CT | Ronald Morelli LLC DBA Romeo Morelli & Sons | 626E860098 | Apprenticeship Sponsor | Jun 30, 2027 |
| Middletown, CT | Roof Diagnostics Solar and Electric of Connecticut LLC/ DBA: NRG Home Solar | B53E372147 | Apprenticeship Sponsor | Jun 30, 2016 |
| Ridgefield, CT | Roosters MGC | 70D0C63881 | Apprenticeship Sponsor | Jun 30, 2019 |
| Windsor Locks, CT | Rooter Express LLC | 017436DF30 | Apprenticeship Sponsor | Jun 30, 2010 |
| Newington, CT | Rooterman Hartford LLC | D6BAB5B16F | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Vernon, CT | Rosa Electric Co. Inc. | 1297D148A9 | Apprenticeship Sponsor | Jun 30, 2026 |
| Milford, CT | Rosado Builders | 66D19CE918 | Apprenticeship Sponsor | Jun 30, 2007 |
| New Britain, CT | ROSS MECHANICAL CONTRACTORS LLC | 2A2938CDDB | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Danbury, CT | Ross Solar Group, LLC | B5E1C24A90 | Apprenticeship Sponsor | Jun 30, 2018 |
| Enfield, CT | Rossi Electric LLC | 4D29C7053C | Apprenticeship Sponsor | Jun 30, 2022 |
| Bridgeport, CT | Rotair Aerospace Corp. | 3FE62A9A3F | Apprenticeship Sponsor | Jun 30, 2023 |
| Avon, CT | ROTHA CONTRACTING COMPANY, INC. | 1616245234 | Apprenticeship Sponsor + 2 more | Jun 30, 2027 |
| Torrington, CT | Rothen Electric Company | 3CA52D360E | Apprenticeship Sponsor | Jun 30, 2012 |
| Stratford, CT | Roto-Rooter Services Company | 32468D7B2C | Apprenticeship Sponsor | Jun 30, 2027 |
| Putnam, CT | Rounder Electric, LLC | 5CC5817982 | Apprenticeship Sponsor | Jun 30, 2008 |
| North Haven, CT | Rousseau Plumbing & Heating LLC | 82FB5B02A8 | Apprenticeship Sponsor | Jun 30, 2027 |
| Putnam, CT | Rovatti Plumbing & Heating, Inc. | AE7D0D0BD3 | Apprenticeship Sponsor | Jun 30, 2009 |
| Rowayton, CT | Rowayton Electric Co., LLC | 13F65F2818 | Apprenticeship Sponsor | Jun 30, 2020 |
| Norwalk, CT | ROWAYTON FUEL & OIL CO INC | 9A5A2BF509 | Home Heating Fuel Dealer + 3 more | Sep 30, 2027 |
| Bristol, CT | Rowley Spring & Stamping Corp. | 7F19B50EE6 | Apprenticeship Sponsor | Jun 30, 2027 |
| Roxbury, CT | Roxbury Electric, Inc. | 8A1D36506D | Apprenticeship Sponsor | Jun 30, 2004 |
| Bloomfield, CT | Royal Mane Hair Studio | D6B05D9744 | Apprenticeship Sponsor | — |
| New Britain, CT | Royal Razor Barbershop, LLC | 5DBDD62C55 | Apprenticeship Sponsor | Jun 30, 2027 |
| Middlefield, CT | ROYBAL & SONS FIRE EQUIPMENT CO. | 96E5FA1C6E | Apprenticeship Sponsor | Jun 30, 2017 |
| Naugatuck, CT | RP3 Electric, LLC | F50AD1776D | Apprenticeship Sponsor | — |
| Greenwich, CT | RPL Plumbing & Heating | E6E98B90A5 | Apprenticeship Sponsor | Jun 30, 2012 |
| South Glastonbury, CT | RS Electric LLC | A06706EE24 | Apprenticeship Sponsor | Jun 30, 2013 |
| Manchester, CT | RT Pro Plumbing, LLC | B4EC9BF338 | Apprenticeship Sponsor | Jun 30, 2027 |
| East Hartford, CT | RTX Technology Research Center | 3626104D76 | Apprenticeship Sponsor | Jun 30, 2026 |
| New London, CT | Ruby Glass Co. Inc. | CAC62081DC | Apprenticeship Sponsor | Jun 30, 2027 |
| Greenwich, CT | Rudolph Biagi & Son Plumbing and Heating | 133601FAD2 | Apprenticeship Sponsor | Jun 30, 2018 |
| Darien, CT | Rudy's Grooming Club LLC | 0CE8888B3A | Apprenticeship Sponsor | Jun 30, 2027 |
| New Haven, CT | Ruotolo Mechanical, Inc. | 686F1F694E | Apprenticeship Sponsor | Jun 30, 2011 |
| Westport, CT | RURAL ENERGY, LLC | 8BFEF0DC9D | Apprenticeship Sponsor | Jun 30, 2027 |
| North Granby, CT | Rush Air Mechanical Services | 739369C9A0 | Apprenticeship Sponsor | Jun 30, 2027 |
| Milford, CT | Russ Electrical Services LLC | 58F60678D8 | Apprenticeship Sponsor | Jun 30, 2007 |
| Waterbury, CT | Russ Turner Heating & Cooling | 9E8F4487E9 | Apprenticeship Sponsor | Jun 30, 2011 |
| Enfield, CT | Russell Electric LLC | C21BD368A0 | Apprenticeship Sponsor | Jun 30, 2025 |
| Litchfield, CT | Russell Electric, Inc. | 8BE9033FF8 | Apprenticeship Sponsor | Jun 30, 2009 |
| Morris, CT | Russell Electric, LLC | 0746E48F47 | Apprenticeship Sponsor | Jun 30, 2027 |
| Enfield, CT | Russell Electrical, LLC | 5CB0F68C66 | Apprenticeship Sponsor | — |
| Canton Center, CT | Russell J. Richardson, Inc. | E3C743CCA2 | Apprenticeship Sponsor | Jun 30, 2023 |
| Montville, CT | Russell Rice Contracting, LLC | 3AD122E2C2 | Apprenticeship Sponsor | Jun 30, 2015 |
| New Britain, CT | RUTKOWSKI PAINT & HARDWARE CO., INC. | 48DAA61880 | Apprenticeship Sponsor | Jun 30, 2027 |
| Bethel, CT | Rux Electric | 6FC41C4A8D | Apprenticeship Sponsor | Jun 30, 2025 |
| Middletown, CT | RVOS, Inc. River Valley Oil Service, LLC | 431A52873B | Apprenticeship Sponsor | Jun 30, 2027 |
| Oxford, CT | RW Electric, LLC | 521BA3316F | Apprenticeship Sponsor | Jun 30, 2027 |
| New Haven, CT | RWA Well Services, LLC DBA Carboni Plumbing & Heating | 777292841A | Apprenticeship Sponsor | Jun 30, 2027 |
| Danbury, CT | RWE Clean Energy, Inc. AKA: CES Danbury Solar, LLC | 652A306B85 | Apprenticeship Sponsor | Jun 30, 2024 |
| New Milford, CT | Ryan F. Murphy Heating & Cooling, LLC | 056D6657E5 | Apprenticeship Sponsor | Jun 30, 2027 |
| Hamden, CT | RYAN OIL CO | E44A58232A | Home Heating Fuel Dealer + 2 more | Sep 30, 2027 |
| Cromwell, CT | Ryan P. Ireton Services, LLC | ADA55F03DF | Apprenticeship Sponsor | Jun 30, 2018 |
| New Milford, CT | Ryan Perlowsky Electric, LLC | 1F59C7A96E | Apprenticeship Sponsor | Jun 30, 2027 |
| West Hartford, CT | S & J Electric LLC | FF940C4E82 | Apprenticeship Sponsor | Jun 30, 2016 |
| Plymouth, CT | S & P ELECTRIC, LLC | 3B86A21FEA | Apprenticeship Sponsor | Jun 30, 2027 |
| West Haven, CT | S & P Electrical Systems, LLC | FA80E3C9B3 | Apprenticeship Sponsor | Jun 30, 2015 |
| Danbury, CT | S & R Plumbing & Heating, Inc. | 1C6028A3F0 | Apprenticeship Sponsor | Jun 30, 2011 |
| Bloomfield, CT | S & S Centerless Grinding Inc. | E3D0B56C8D | Apprenticeship Sponsor | Jun 30, 2027 |
| Bethel, CT | S & S Electric, Electrical Contractors LLC | 58BB758254 | Apprenticeship Sponsor | Jun 30, 2017 |
| Wolcott, CT | S&G Electrical, LLC | 2CB4CE3D3A | Apprenticeship Sponsor | Jun 30, 2027 |
| Bristol, CT | S. Carpenter Construction Co. | 5C3843BC99 | Apprenticeship Sponsor | Jun 30, 2015 |
| Torrington, CT | S. Clark Plumbing and Heating, LLC | 2691BE6280 | Apprenticeship Sponsor | Jun 30, 2018 |
| East Hampton, CT | S. Marchant Plumbing LLC | B063982618 | Apprenticeship Sponsor | Jun 30, 2009 |
| Seymour, CT | S. Marcinczyk Electric, LLC | 40A4A0D0E0 | Apprenticeship Sponsor | Jun 30, 2027 |
| Riverside, CT | S.D.R. Plumbing and Heating, Inc. | D9F4308639 | Apprenticeship Sponsor | Jun 30, 2027 |
| Brookfield, CT | S.L. Kelley Electric Co., Inc. | 314E1C5A92 | Apprenticeship Sponsor | Jun 30, 2024 |
| East Haven, CT | S.L. Liston, LLC | 11B420643B | Apprenticeship Sponsor | Jun 30, 2027 |
| Stamford, CT | Sabanski Plumbing & Heating, LLC | 960D03DE70 | Apprenticeship Sponsor | Jun 30, 2027 |
| Bethel, CT | Sabella Brothers Electric | 55ED15E2E6 | Apprenticeship Sponsor | Jun 30, 2026 |
| Wilton, CT | Sabella Electric | 0270333699 | Apprenticeship Sponsor | Jun 30, 2009 |
| Stamford, CT | SAC Capital Advisors | 2DE6CAF698 | Apprenticeship Sponsor | Jun 30, 2008 |
| Willington, CT | SADOW EXCAVATION INC | 91BED26171 | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Old Greenwich, CT | SAFE AND SOUND ELECTRIC, LLC | F566DF85B5 | Apprenticeship Sponsor | Jun 30, 2027 |
| Milford, CT | Safe and Sound Systems | F675E8A59B | Apprenticeship Sponsor | Jun 30, 2020 |
| Middletown, CT | SAFE HOME SECURITY INC | 7BC934CCC2 | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Plantsville, CT | Safeguard Electric, LLC | 786432BCC7 | Apprenticeship Sponsor | Jun 30, 2008 |
| Windsor Locks, CT | Safeguard Security and Surveillance Inc | 64C8FF90D9 | Apprenticeship Sponsor | Jun 30, 2026 |
| Salem, CT | SAFELAWNS OF SALEM, INC | 1D5557DEEB | Pesticide Application Business Registration + 1 more | Aug 31, 2027 |
| Stratford, CT | Safelite Auto Glass | 57B2D479B1 | Apprenticeship Sponsor | Jun 30, 2027 |
| Bridgeport, CT | Safety Marking, Inc. | 9EB29BFA5F | Apprenticeship Sponsor | Jun 30, 2023 |
| Shelton, CT | Sage Electrical Services | 301CA2D3B6 | Apprenticeship Sponsor | Jun 30, 2011 |
| Winsted, CT | SAIL ENERGY, LLC DBA KLEBE FUEL | 74224AB326 | Apprenticeship Sponsor | Jun 30, 2027 |
| Waterbury, CT | SAINT MARY'S HOSPITAL CORP | 7439D64DBA | Controlled Substance Registration For Hospitals + 2 more | Feb 28, 2027 |
| Bloomfield, CT | SAJE AEROSPACE INC | 16819DE641 | Apprenticeship Sponsor | Jun 30, 2027 |
| Seymour, CT | Sal Mangione & Sons Construction, Inc. | DCDCD01F64 | Apprenticeship Sponsor | Jun 30, 2027 |
| Stamford, CT | SAL SABIA ELECTRICAL CONTRACTORS, INC. | 01EB1B1AA3 | Apprenticeship Sponsor | Jun 30, 2027 |
| Darien, CT | Sal's Electric, LLC | 08023EAF48 | Apprenticeship Sponsor | Jun 30, 2016 |
| Woodbridge, CT | Sal-War, Inc. | F8C91EA599 | Apprenticeship Sponsor | Jun 30, 2004 |
| Middletown, CT | Salafia Electric, LLC | 860838C250 | Apprenticeship Sponsor | Jun 30, 2027 |
| North Salem, NY | Salem Electric Inc. | 3B00ADA711 | Apprenticeship Sponsor | Jun 30, 2010 |
| Greenwich, CT | Salerno Plumbing & Heating LLC | 6A2C599DAE | Apprenticeship Sponsor | Jun 30, 2010 |
| West Hartford Ct, CT | Sally Patrick Moynihan Plumbing Co., LLC | 2CB71BCEC3 | Apprenticeship Sponsor | Jun 30, 2027 |
| Madison, CT | Salon H | B047C9BC12 | Apprenticeship Sponsor | — |
| Mystic, CT | Salon Nevieve | D78BA26D08 | Apprenticeship Sponsor | Jun 30, 2026 |
| North Haven, CT | SALON SPACE, LLC | 8B6BC30E17 | Apprenticeship Sponsor | Jun 30, 2027 |
| Meriden, CT | SalonCelines | 39EE379528 | Apprenticeship Sponsor | Jun 30, 2027 |
| Rocky Hill, CT | Salone Electric, Inc. | 2B2369A958 | Apprenticeship Sponsor | Jun 30, 2026 |
| East Hartland, CT | Salvatore Electric, LLC | 1D3C789CBC | Apprenticeship Sponsor | Jun 30, 2017 |
| Danbury, CT | Salvatore Plumbing LLC | D82A912EF4 | Apprenticeship Sponsor | Jun 30, 2027 |
| Fairfield, CT | Salvioli Electric | A3138EE433 | Apprenticeship Sponsor | Jun 30, 2027 |
| New Fairfield, CT | Samanna Plumbing & Heating | 58D7644B80 | Apprenticeship Sponsor | Jun 30, 2024 |
| North Branford, CT | Sampson Electric, LLC | 3BCCF0E626 | Apprenticeship Sponsor | Jun 30, 2027 |
| Wolcott, CT | Samson Machine, Inc. | F592A2C8FD | Apprenticeship Sponsor | Jun 30, 2020 |
| Brooklyn, CT | SANACO INC. DBA HOMETOWN HEATING | 63EB0E7DF1 | Apprenticeship Sponsor | Jun 30, 2027 |
| Stamford, CT | Sandalo Plumbing & Heating, Inc. | 9D6944DA0E | Apprenticeship Sponsor | Jun 30, 2011 |
| Windsor, CT | Sandamena Plumbing & Heating | C992A6885B | Apprenticeship Sponsor | Jun 30, 2005 |
| New Milford, CT | Sander Plumbing & Mechanical | 4E990D601F | Apprenticeship Sponsor | Jun 30, 2008 |
| Waterford, CT | Sanders Electric LLC | 2171AAA506 | Apprenticeship Sponsor | Jun 30, 2027 |
| Sandy Hook, CT | SANDY HOOK PLUMBING & HEATING LLC | 39609A25FD | Home Improvement Contractor + 1 more | Mar 31, 2027 |
| Wolcott, CT | Sandy's TV & Appliance Inc. | 03F3F80DCB | Apprenticeship Sponsor | Jun 30, 2011 |
| Darien, CT | Sanford Electric LLC | 4F9A18833D | Apprenticeship Sponsor | Jun 30, 2008 |
| Hampton, CT | Sanford Plumbing | 2AE56A6C77 | Apprenticeship Sponsor | Jun 30, 2026 |
| Bridgeport, CT | Santa Energy | 44A55FEEF8 | Apprenticeship Sponsor | Jun 30, 2027 |
| Wethersfield, CT | Santabono, Inc. | A202D730C2 | Apprenticeship Sponsor | Jun 30, 2027 |
| New Britain, CT | SANTANA ELECTRICAL CONTRACTORS, LLC | 56C9CBABC8 | Apprenticeship Sponsor | Jun 30, 2023 |
| New Canaan, CT | Santella Electric Inc. | B2D183E53A | Apprenticeship Sponsor | Jun 30, 2027 |
| Shelton, CT | Santilli Fuel LLC | D7E19872D0 | Apprenticeship Sponsor | Jun 30, 2027 |
| North Windham, CT | Santor Electrical Contractors, LLC | 8DB856739B | Apprenticeship Sponsor | Jun 30, 2027 |
| Berlin, CT | SANTORO ELECTRIC LLC | CAEC74E2E3 | Apprenticeship Sponsor | Jun 30, 2027 |
| Prospect, CT | Santoro's Plumbing & Well Service | CABB0750F9 | Apprenticeship Sponsor | Jun 30, 2027 |
| Waterbury, CT | Santos Electric | D1F95A54CF | Apprenticeship Sponsor | Jun 30, 2017 |
| Trumbull, CT | Santos Heating & Cooling Inc. | B59D0CD6FF | Apprenticeship Sponsor | Jun 30, 2007 |
| Greenwich, CT | SARGEANT ELECTRIC CO LLC | B877F3F2C9 | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| New Haven, CT | Sargent Manufacturing Company | 8C86DF2921 | Apprenticeship Sponsor | Jun 30, 2027 |
| Waterbury, CT | SARRACCO MECHANICAL SERVICES INC | 9D6C9A473B | Major Contractor + 1 more | Jun 30, 2027 |
| North Branford, CT | SARTRON, LLC | 02E6DC8F0E | Apprenticeship Sponsor | Jun 30, 2018 |
| Madison, CT | Sattler Electric Company, LLC | 7623DE1EE0 | Apprenticeship Sponsor | Jun 30, 2008 |
| Plantsville, CT | SAUCIER MECHANICAL SERVICES, INC. | 9082D9BB09 | Apprenticeship Sponsor | Jun 30, 2027 |
| Southington, CT | SAV-MOR COOLING & HEATING INC | A8A29C573A | Major Contractor + 2 more | Jun 30, 2027 |
| Bristol, CT | SAVKAT, INC | 0794C33ACF | Apprenticeship Sponsor + 1 more | Jun 30, 2027 |
| Oxford, CT | Savoy Mechanical Services, LLC | 9C3EA0E145 | Apprenticeship Sponsor | Jun 30, 2010 |
| Old Saybrook, CT | Saybrook Contractors | BF4F3B86F6 | Apprenticeship Sponsor | Jun 30, 2006 |
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.