| Red Ops | A, B | 2026 | Active |
| Red Pointe Roofing LP | B + C39 | 2013 | Active |
| Regal Commercial Services | B + C15, C33, C54 +2 | 2009 | Active |
| Renaissance Kithchen Bath & Flooring Inc | B + C15 | 2011 | Active |
| Resolute Construction Inc | B | 2024 | Active |
| Rick Hamm Construction Inc | B + C8, C21, C29 +1 | 1986 | Active |
| Ridgevian Development Group | A, B | 2024 | Active |
| Rivera Construction Services | B | 2024 | Active |
| Riverview Development Group Inc | B | 2026 | Active |
| RM Construction & Development LLC | B | 2025 | Active |
| Roberto General Construction | B | 2022 | Active |
| Rock Bottom Construction Inc | B + C10, C27 | 2002 | Active |
| Roman Restoration | B | 2020 | Active |
| Rowe Electric Inc | B + C10 | 2004 | Active |
| Rox Builders | B | 2023 | Active |
| RPG Enterprises | B + D28 | 1996 | Active |
| Rubicon Engineering Corporation | A, B + HAZ | 2004 | Renew by Nov 30, 2026 |
| RW Scherrer Inc | B | 2020 | Active |
| S & D Associates | B | 1982 | Active |
| S & P Premier Home Builders Inc | B + C10, C33 | 1983 | Active |
| S L P Design & Associates Inc | B | 2012 | Active |
| S O S Facility Maintenance Inc | B + C6 | 2012 | Active |
| S P Carpet Pros Inc | B | 2002 | Renew by Nov 30, 2026 |
| Scott Richardson Construction Inc | B | 2021 | Active |
| Seib Construction | B + C6 | 2007 | Active |
| Shamrock Construction Services Inc | B | 2012 | Renew by Oct 31, 2026 |
| Shepherd Custom Construction LLC | B | 1985 | Active |
| Slater General Inc | B | 2010 | Active |
| SLCC | B | 2018 | Active |
| Slim Construction Inc | B | 2024 | Active |
| SM General Builder Inc | B | 2024 | Active |
| So Cal Unlimited Construction | B | 2023 | Active |
| Solari Enterprises Inc | B | 1994 | Active |
| South Coast Construction Services Inc | B | 2010 | Active |
| South Coast Deck Inspections | B | 2024 | Active |
| SPC Building Services | B + C33 | 1994 | Active |
| Stalwart Construction Inc | B | 2024 | Active |
| Stice Company Inc | A + C12, C21 | 1987 | Active |
| Storm Water Innovative Solutions Inc | A | 2016 | Active |
| Sunsmart Patios | B + C8, D03 | 2008 | Active |
| Synergy Property Improvements Experts Corp | B | 2025 | Active |
| System Pavers LLC | B + C27, D06, D12 | 1992 | Active |
| Systems Integration | B + C10 | 2004 | Active |
| Tanc And Vogel Construction LLC | B | 2017 | Active |
| Tapia Homes Inc | B | 2025 | Active |
| Taylor - Made Waterproofing | B | 2010 | Active |
| TDS Premier Enterprise Inc | B + C7 | 2024 | Active |
| Tekton Services Inc | B | 2026 | Active |
| Telacu Construction Management Inc | B | 1997 | Active |
| Terra Oc Design Build Inc | B + C27 | 2026 | Active |
| Tesoro Homebuilders Inc | B | 2006 | Active |
| The Ca Builders Inc | B | 2025 | Active |
| The Dock Company JV Inc | A, B | 2023 | Active |
| The Hatch Group Inc | B | 2004 | Active |
| The Ocip Co | B | 2020 | Renew by Nov 30, 2026 |
| Thomas Construction & Remodeling Inc | B | 2026 | Active |
| Thomas N T Construction Inc | B | 2001 | Active |
| Tiger Services | A, B + C10 | 1981 | Active |
| Tiller Constructors Partnership Inc | B + C10, C36 | 1990 | Active |
| TMC Enterprises | B | 2022 | Active |
| Today's Entry Doors | B + D28 | 1988 | Active |
| Tolly Incorporated | B + C27 | 2001 | Active |
| Total Health Environment LLC | B | 2017 | Active |
| Total Telco Specialists Inc | B + C7 | 1996 | Active |
| Treni Cole Builders Inc | B | 2015 | Active |
| Tru Landscape Services | B + C27 | 2007 | Active |
| Truadditions Corp | B | 2019 | Active |
| Truebuilt Construction Inc | B | 2019 | Active |
| TSW Corporation | B | 1992 | Active |
| Tumser & Associates | B | 1995 | Active |
| Tyreman Construction Corp | B | 1988 | Active |
| Vanguard Property Construction Services | B | 2025 | Active |
| Vasquez Construction Inc | B | 2009 | Active |
| Vi Trac Inc | B + C7, C10, C17 | 1986 | Active |
| Vic's Electric Inc | B + C10, C36 | 2000 | Active |
| Visosky Dean Contractors Inc | B + C8, C27 | 2015 | Active |
| Wally Fix It All Construction | B2 | 2026 | Active |
| Wehner Framing Inc | B | 2003 | Active |
| West Coast Building Group Inc | B + C33 | 2012 | Active |
| West-Cal Construction Company | B | 1973 | Active |
| Whelks Building Group LLC | B | 2017 | Active |
| Wimbleton Group The | B | 2024 | Active |
| World Restoration Inc | B | 1994 | Active |
| Yrz Company | B + C33, C45, D03 +6 | 2020 | Active |
| Zadeh Contracting | A, B | 1996 | Active |
| Zaretsky Building Solutions | B + C10, C20, D62 | 2025 | Active |