| Quality Painting Solutions Inc | B + C33 | 2016 | Active |
| Quality Restoration | B | 2024 | Active |
| R & M Interior Construction | B | 2022 | Active |
| Raincross Development Group LLC | B | 2022 | Active |
| Rake Building Solutions Inc | B | 2019 | Active |
| Ramsey Oil Company Inc | A + C12 | 2019 | Active |
| RC Construction & Design | B | 2015 | Active |
| RCR Construction Services Inc | B | 2008 | Active |
| RCSS Inc | A + C10, C31 | 2025 | Active |
| Regan Paving | A | 1988 | Active |
| Reliable Construction Services LLC | A + D21 | 2013 | Active |
| Reliable Renovation Inc | B + C6, C15, D12 | 2005 | Active |
| Reliant Tower LLC | B + C10 | 2021 | Active |
| Remodel Experts Inc | B | 2005 | Active |
| Renewable Energy Partners Inc | B + C10 | 2014 | Active |
| Resto Bros Plumbing & Restoration | A, B + ASB, C2, C36 +1 | 2022 | Active |
| Ri Construction Inc | B | 2024 | Active |
| Richmond American Homes Of Maryland Inc | B | 1986 | Active |
| RJM & Associates Inc | B | 1995 | Active |
| Robles Contractors Inc | B + C36 | 2008 | Active |
| Rockland Framing Inc | B | 1999 | Active |
| Rodpaz Bros Inc | A | 2009 | Active |
| Rodsal Builders | B | 2013 | Active |
| Rojas Construction General Contractor Inc | B | 2022 | Active |
| Rolcom Inc | A, B + C10 | 2006 | Active |
| Rosales General Engineering Contracting Inc | A | 2015 | Active |
| RS Renovations Inc | B2 | 2026 | Active |
| Ruelas General Construction | B | 2026 | Active |
| S & S Commercial Environmental Services Inc | A, B + ASB, C2, C36 +2 | 1997 | Active |
| S & S Directional Drilling Inc | A + D09 | 2001 | Active |
| S C P Construction Inc | B + C33 | 2009 | Active |
| S E C C Corporation | A + C7, C10 | 1995 | Active |
| S E Nelson Construction Inc | A | 2003 | Active |
| Sal's Remodeling Co | B2 | 2026 | Active |
| Sanvinet Inc | B + C7 | 2018 | Active |
| Sar Construction | B | 2021 | Active |
| Scott General Contracting Inc | B | 2017 | Active |
| Seamless Care Inc | B | 2011 | Active |
| Secc Wireless | A + C7, C10 | 2023 | Active |
| Sekoya Construction | B | 2019 | Active |
| Sequoias Design Build LLC | B | 2026 | Active |
| Servpro Of Corona | B | 2001 | Active |
| Servpro Of Fontana Construction | B | 2022 | Active |
| Servpro Of Garden Grove West/Stanton | B + C10 | 2023 | Active |
| Servpro Of North San Bernardino City | B | 2024 | Active |
| Shook Building Systems Inc | B + C51 | 1973 | Active |
| Signature Flooring | B | 2015 | Active |
| Sloan Security Group Inc | A, B + C13, D28 | 2006 | Active |
| Smart Solutions Construction | B | 2021 | Active |
| SNS Renovations Inc | B | 2026 | Active |
| SNS Renovations LLC | B | 2026 | Active |
| So Cal Sandbags Inc | A | 1991 | Active |
| Socal Millworks Inc. | B2 | 2023 | Active |
| Socal Remodeling Crew Inc | B | 2018 | Renew by Nov 30, 2026 |
| Sogood Construction | B | 2025 | Active |
| Southern California Patios Inc | B | 2010 | Active |
| Southstar Construction Inc | A, B + C10, C36 | 2021 | Active |
| Ssi Construction Inc | B + C36 | 2016 | Active |
| Stellar Building Designs | B | 2020 | Renew by Nov 30, 2026 |
| Stevens R T Construction Inc | B | 2007 | Active |
| Stevenson Team Construction Corp | A | 2012 | Active |
| Stewart Construction Company Corp | A, B | 2021 | Active |
| Stitt J M Construction Inc | B | 1994 | Active |
| Straus Designs/Build | B | 2014 | Active |
| Structa Construction | B | 2026 | Active |
| Summit Building Company | B | 2020 | Active |
| Sun Escape Patios LLC | B | 2011 | Active |
| Sunny Coast Construction Inc | B | 2014 | Active |
| Superior Construction Inc | B | 1976 | Renew by Nov 30, 2026 |
| T C P N Inc | B + C51 | 2016 | Active |
| T J Gold | B | 2016 | Active |
| T W G | B + C17 | 2007 | Active |
| T W R Enterprises Inc | B | 1986 | Active |
| T3 Construction And Handyman Service Inc | B | 2023 | Active |
| Tabikha Incorporated | B | 2006 | Active |
| Telecommunication Development & Construction Inc | A, B + C7, C8, C10 +4 | 2019 | Active |
| The Quality Plus Group | A, B + C47, D03 | 2021 | Active |
| Thiena Corporation | A, B + C39 | 2007 | Active |
| Timber & Tact LLC | B | 2026 | Active |
| TLG Paving Company Inc | A + C12 | 2005 | Active |
| TLH Maintenance Inc | B | 2015 | Active |
| Tony Doumani Creations | B + C53 | 2000 | Active |
| Town Wood California | B | 2023 | Active |
| Traks R US | B | 2003 | Active |
| Trencore Plastering Inc | B + C35 | 2014 | Active |
| Tri County Development & Construction Inc | A, B + C7, C8, C10 +4 | 2013 | Active |
| Tributary Management Group Inc | B | 1978 | Active |
| Tricon General Contracting Inc | B | 2011 | Active |
| Trinity Exteriors And Design LLC | B | 2025 | Active |
| Tripp Construction | B | 1988 | Active |
| Turnkey Residential Solutions | B2 | 2026 | Active |
| Uac Builders | B + C10 | 2005 | Active |
| Unified Modular Corporation | B | 2020 | Active |
| United Connect Services | B | 2023 | Active |
| United Partition Systems Inc | B + D34 | 1983 | Active |
| United Paving Co | A + C12 | 2005 | Active |
| Usig Construction | B | 2023 | Active |
| Va Builders LLC | A, B | 2026 | Active |
| Van Daele Development Corporation | B | 1987 | Active |
| Van Daele Development Of Northern California | B | 2012 | Renew by Dec 31, 2026 |