| Santiago Communities Inc | A, B + C47 | 2001 | Active |
| Santiago Homes Inc | B + C47 | 2007 | Active |
| SDS Design Build | B | 2025 | Active |
| Sean Murphey Construction, Inc. | B + C53 | 1994 | Active |
| Seashore Construction Inc | B | 1985 | Active |
| Seaview Construction Services Inc | B | 2015 | Active |
| Service First | B + C2, C9, C10 +6 | 1989 | Active |
| Servicemaster By One Call Restoration | B | 2012 | Active |
| Sierra Pacific Construction Inc | B | 2022 | Renew by Nov 30, 2026 |
| Sierra S Pacific Builders Inc | B | 2021 | Active |
| Skye Construction | B | 2020 | Active |
| Smart Building Construction | B | 2023 | Active |
| Socal Flood Restoration And Design | B | 2020 | Active |
| Socal Removal | A, B + ASB, C21, HAZ | 2013 | Active |
| Sol Builders Inc | B | 2024 | Active |
| Solo Homes Corporation | B | 2013 | Active |
| South Coast Construction Services | B + C33 | 2023 | Active |
| South Coastal Construction | B + C8 | 2024 | Active |
| South County Drywall Inc | B + C9 | 2007 | Active |
| Southern Counties Quality Masonry | B + C29 | 1965 | Active |
| Southern Vision Windows Inc | B + C17 | 2024 | Active |
| Spartan General Contractors | B | 2022 | Active |
| Ssi Construction Management Services Inc | B | 2023 | Active |
| Star Quality Construction Inc | B | 2019 | Active |
| Straight Line Construction Services Inc | B | 2012 | Renew by Nov 30, 2026 |
| Sukut Construction Inc | A, B + HAZ | 1989 | Active |
| Sukut Construction LLC | A, B + C21, D49, HAZ | 2013 | Active |
| Sukut Development Inc | A, B + HAZ | 1998 | Active |
| Sunny Hills Restoration | B | 1996 | Active |
| Surgener Construction | B + C8 | 1988 | Active |
| Synergy Installers L A LLC | B | 2023 | Active |
| T & Y Inc | B | 2017 | Active |
| T M V Construction Inc | B | 2021 | Active |
| T R C Development Company Inc | B | 2020 | Active |
| T S Engineering & Services | A | 2019 | Active |
| Tait & Associates Inc | A + HAZ | 1969 | Active |
| Tait Environmental Services Inc | A + C10, HAZ | 1990 | Active |
| Tally Ron Construction Inc | B | 2003 | Active |
| Technique Construction Company | A, B | 2025 | Active |
| Tecta America Southern California Inc | B + C39, C43 | 2002 | Active |
| Tekne Development Inc | B | 2015 | Active |
| Terra-Chic Remodeling & Design Inc | B | 2024 | Active |
| Testa Construction Inc | B + C8 | 1986 | Renew by Dec 31, 2026 |
| The Labor Solution LLC | B + C15, C54, D12 | 2015 | Active |
| The Marque Construction Inc | B | 2026 | Active |
| The Original Cabinet Experts | B | 2013 | Active |
| The Ralph Hernandez Company Inc | A, B + C8 | 1984 | Active |
| The Termite Guy | B + C39 | 2026 | Active |
| The Water Damage Company | B | 2008 | Active |
| Theluve Construction Company | B | 2024 | Active |
| TLS Choice LLC | B | 2017 | Active |
| Tobin Steel Company Inc | A, B | 1984 | Active |
| Top Quality Builders LLC | B | 2025 | Active |
| Top Tier Home Renovation Inc | B + D24 | 2006 | Active |
| Total A Remodeling Corp | B2 | 2026 | Active |
| Totl Modular Construction Inc | B | 2013 | Active |
| Tractor Works | A | 2007 | Active |
| Trenchers West Construction Co Inc | A | 1983 | Active |
| Triaxis Construction Inc | A | 2026 | Active |
| Triple G Construction LLC | B + C15 | 2023 | Active |
| Trust Construction E & C Inc | B | 2024 | Active |
| Ultimate Home Services Inc | B | 2006 | Renew by Nov 30, 2026 |
| Upend Manor Renovation | B | 2016 | Active |
| USA Metal Construction Inc | B | 2025 | Active |
| V & V Builders Inc | B | 2006 | Active |
| V C D & Sons Inc | B | 1990 | Active |
| Valencia Construction Co Inc | B | 2019 | Active |
| Varciag Construction Inc | A, B | 1991 | Active |
| Ventmart Hoods Master | B + C16 | 2016 | Active |
| VHD Construction Inc | B | 2020 | Active |
| VHS Construction Inc | B | 2026 | Active |
| Vidal General Construction Inc | B | 2025 | Active |
| Vido Samarzich Inc | A | 1982 | Renew by Dec 31, 2026 |
| Villegas 10 | A, B | 2023 | Active |
| VL Renovations | B2 | 2022 | Active |
| Ward - Tek Construction Inc | B | 2003 | Active |
| Wayne Engineering Construction | A + C51 | 2017 | Active |
| Williams & Maher Inc | B + C10 | 1985 | Active |
| Woodbridge Glass Inc | B + C8, C17, C43 +1 | 1987 | Active |
| XPRT Construction | B + C15 | 2003 | Active |
| Y & J Construction Inc | B + C39 | 2022 | Active |
| Y N G Construction Inc | B | 2016 | Renew by Dec 31, 2026 |
| Zamarripa Roland Construction | B | 1984 | Renew by Nov 30, 2026 |
| Zarate Construction Inc | B + C27 | 2009 | Active |
| Zion General Maintenance And Construction Incorporated | B | 2021 | Active |
| ZZ Construction Inc | A, B | 2019 | Active |