| Socal Cabinet Renovations | B + C6 | 2015 | Active |
| Socal Construction Corporation | B | 2023 | Active |
| Socal Flooring And Construction Inc | B + C15 | 2021 | Active |
| Soho Construction Inc | A, B + C6, C54 | 2014 | Active |
| Solidstone Homes Inc | B | 2026 | Active |
| Source Racks LLC | B | 2026 | Active |
| South Coast Construction 1 Inc | B | 2014 | Active |
| Southern California Grading Inc | A + C12 | 1972 | Active |
| Southern Fireplace Distributors Inc | B + D34 | 1996 | Active |
| Southwest Builders | B | 2017 | Active |
| Speedy Fix Inc | B | 2018 | Active |
| SSD Constructors Inc | A, B + C10 | 2025 | Active |
| Standard Construction Company Inc | B | 2020 | Active |
| STC Management LLC | A, B | 2018 | Active |
| Stone Development Inc | B | 2025 | Active |
| Studio Amaar LLC | A, B + C20, C36 | 2025 | Active |
| Studio Eight Design Build LLC | B | 2025 | Active |
| Suncoast Kitchen & Bath | B | 2025 | Active |
| Suntrust Remodeling | B | 2022 | Active |
| T E S | A, B | 1999 | Active |
| T I R F U Construction Inc | B | 2007 | Active |
| Talisse Construction Inc | B | 2006 | Active |
| Tama Construction Inc | B | 1999 | Active |
| TDC Home Remodeling | B2 | 2026 | Active |
| Tec Management Consultants Inc | A, B + C8, C9, C54 +1 | 1998 | Active |
| Techcraft Construction Inc | B | 2002 | Active |
| Tenaya Construction Inc | A, B | 2020 | Active |
| Terra Pacific Group Incorporated | A + HAZ | 2006 | Active |
| Terra Pacific Waste Management Construction Inc | B | 2011 | Active |
| Tevron Construction Co | A, B + C10, C21 | 2026 | Active |
| Texim Incorporated | B | 2017 | Active |
| Tezo Inc | B | 2010 | Active |
| Thanh Trung Construction LLC | B | 2025 | Active |
| Times Construction Inc | B | 2019 | Active |
| Times Group U S A Inc | B | 2009 | Active |
| Tint Master Enterprise And Affiliates Inc | B + C33 | 1991 | Active |
| TJ HVAC Services | B + C20, C54 | 2026 | Active |
| Toltec Fire Protection | B + C10, C16 | 2026 | Active |
| Tompkins Flooring Inc A California Corporation | B + C15 | 2000 | Active |
| Top & Top Enterprises | B | 2022 | Active |
| Top Pro Team Inc | B | 2026 | Active |
| Top Way Construction Inc | B | 2007 | Active |
| Total Incharge Inc | B | 2026 | Active |
| TRC Engineers Inc | A | 2019 | Active |
| TRC Solutions Inc | A | 1981 | Active |
| Tre D Inc | B | 2017 | Active |
| Tri County Construction | B | 2019 | Active |
| Tri Pointe Homes | B | 2016 | Active |
| Trident CPM Building & Consulting | B | 2025 | Active |
| Trimark Raygal LLC | B + C38, D34 | 2016 | Active |
| Trio-Bros Builder | B + C36 | 2025 | Active |
| True Home Builders Inc | B + C10, D06 | 2021 | Active |
| Tryangle Construction Inc | B | 2022 | Active |
| TSP Roof Systems Inc | B + C39 | 2012 | Active |
| Tulum General Contracting | B | 2025 | Active |
| U J Thinktank Inc | B | 2020 | Renew by Dec 31, 2026 |
| U S Builders And Consultants Inc | A, B | 2020 | Renew by Dec 31, 2026 |
| Ucoc Inc | B | 2008 | Active |
| United Construction & Development | B + C10 | 2002 | Active |
| Uprite Construction Corporation | A, B | 2009 | Active |
| Urban Garage Door | B + D28 | 2019 | Active |
| Urgent Garage Doors | B + D28 | 2019 | Active |
| USA Home Remodeling Inc | B | 2021 | Active |
| Utility Power Construction | A | 2023 | Active |
| Uzun Construction | B | 2025 | Active |
| V & J Design And Builders | B + C27 | 2020 | Active |
| Varisco Design Build Group | B + C6 | 1986 | Active |
| Vci Builds LLC | B | 2020 | Active |
| Venguard Construction Inc | B | 2024 | Active |
| Verdantas Inc | A + HAZ | 2005 | Active |
| Veritech Plumbing LLC | B + C36 | 2021 | Active |
| Vertex Civil LLC | A, B + C21 | 2021 | Active |
| Vertical Construction Inc | B | 1981 | Active |
| Veterans Utility Services | A | 2026 | Active |
| Vicorel | B | 2025 | Active |
| Vieko Innobuild Inc | B + C39 | 2025 | Active |
| Vimvi California Corporation | B | 2023 | Active |
| Vincero Construction & Management LLC | B | 2022 | Renew by Nov 30, 2026 |
| Virzi Charles Construction Inc | B | 2004 | Active |
| W Home Construction&Development | B | 2019 | Active |
| Walker J L Construction Services Inc | B | 2020 | Active |
| Wardour Construction LLC | B | 2021 | Active |
| WCCS Construction Inc | B | 2026 | Active |
| Wei Design & Construction Inc | B | 2025 | Active |
| Wesdev Construction USA Inc | B + C15, C17 | 2011 | Active |
| West Coast Building Masters Inc | B | 2024 | Active |
| Westco Development Inc | B | 2020 | Active |
| Western National Builders | B | 2012 | Active |
| Western National Contractors | B | 2004 | Active |
| Westinch Construction | B, B2 | 2024 | Active |
| Whitsell Restoration & Remodel LLC | B | 2021 | Active |
| William Baile Construction Services | B | 2025 | Active |
| William Baile Construction Services LLC | B | 2021 | Active |
| William Lyon Homes Inc | B | 1988 | Active |
| Winchell Dale R Construction Inc | B | 1984 | Active |
| Winsun Construction | B | 2025 | Active |
| Woodbury Construction | B | 2025 | Active |
| World Of Remodeling & Construction Inc | B | 2022 | Renew by Dec 31, 2026 |
| WPL Builder Inc | A, B + C10, C16, C36 | 2023 | Active |
| Wynmore Remodel | B2 | 2022 | Active |