| Cemco Construction | A, B + C8 | 2010 | Active |
| Cerrato Construction Inc | B | 2024 | Active |
| Chadwick's Home Improvement LLC | B2 | 2024 | Active |
| Champas Construction Company Inc | B | 2003 | Active |
| Chand's Construction | B | 2002 | Renew by Nov 30, 2026 |
| Chapco Construction LLC | A | 2024 | Active |
| Cherenkov Code Consulting LLC | B + C39 | 2026 | Active |
| Chilelli Michael J General Contractor Inc | B | 1988 | Active |
| Chriswell Home Improvements Inc | B + C39, D03, D12 +2 | 2010 | Active |
| Citadel Construction Co | B | 2024 | Active |
| City Builders Inc | B | 2013 | Active |
| Cityline Construction Inc | B + C15 | 2025 | Active |
| Civil Pacific Inc | A | 2016 | Active |
| Clark Ross Material Handling & Ergonomic Solutions Inc | B + D24 | 1998 | Renew by Dec 31, 2026 |
| Clear View Builders Inc | B + C17 | 2022 | Active |
| Cleo Construction Inc | B | 2026 | Active |
| Cobex Construction Group | B + C39, C47 | 2017 | Active |
| Colmenares Plaster And Decking Inc | B + C35, D12 | 2009 | Active |
| Comfort Systems Construction Inc | B + C10, C20, C46 | 1988 | Active |
| Comfortbuild | B | 2026 | Active |
| Community Resource Project Inc | B + C17, C20, C36 | 1991 | Active |
| Conable Trim Incorporated | B | 1998 | Active |
| Confluence Design Build Inc | B | 2003 | Active |
| Conrad Ethan Construction Inc | B | 2015 | Active |
| Construction | B2 | 2024 | Active |
| Construction | B | 2021 | Active |
| Construction | B | 2025 | Active |
| Construction Maven | B | 2021 | Active |
| Construction Services By J&P LLC | B | 2015 | Active |
| Constructivo Construction Inc | B | 2024 | Active |
| Contemporary & Modern Homes | B | 2021 | Active |
| Contractor Hero | B | 2025 | Active |
| Cooke Construction | B | 1999 | Active |
| Cordano Construction Company Inc | B | 2023 | Active |
| Cornerstone Construction | B | 2022 | Active |
| Cornett Construction | B | 2022 | Active |
| Corollary Construction Inc | B | 2025 | Active |
| Craftman Strong Builders Inc | B | 2023 | Active |
| CT Builders LLC | B | 2022 | Active |
| Custom Fireside Shops Inc | B + D34 | 1990 | Active |
| Cuttle Construction Co Inc | B | 1968 | Active |
| D & D Plumbing | A, B + C36 | 1992 | Active |
| D & J Kitchens And Baths Inc | B | 2003 | Active |
| D & L Construction | A | 2019 | Active |
| D & S General Contractors | B | 2006 | Active |
| D D K Mechanical Inc | B + C20, C36, C43 | 2005 | Active |
| D H Construction | B + C15, D52 | 1978 | Active |
| D N B Infrastructure Inc | A, B + ASB | 2004 | Active |
| D&S Development | B | 2009 | Active |
| Dainamic Builders Inc | A, B | 2015 | Active |
| Danko Builders | B | 2026 | Active |
| DB Baker Construction Inc | B | 2010 | Active |
| Delta Construction Project Management Inc | A, B | 1998 | Active |
| Den Defenders | B + C29, D28, D52 | 2009 | Active |
| Denicola Kingdom Builds Inc | B | 2026 | Active |
| Denis Burduja Inc | A | 2025 | Active |
| Depiazza And Reed Construction | B + C6 | 2015 | Active |
| DHS Renovation | B2 | 2025 | Active |
| Diablo Valley Construction Inc | B | 2023 | Active |
| Diamante Builders | B + D12 | 2024 | Active |
| Diamond Grit Construction Inc | B + C10 | 2025 | Active |
| Diamond Home Builders Inc | B | 2024 | Active |
| Diesel Engineering And Asphalt Inc | A | 2013 | Active |
| Dietz Joshua | B + C54 | 2003 | Active |
| Dig Civil Construction | A | 2026 | Active |
| Dinuova Building & Design LLC | B | 2023 | Active |
| DL Design Construction Inc | B | 2017 | Active |
| Dna Restoration By Elite LLC | B | 2025 | Active |
| Dominguez Landscape Services Inc | A, B + C27 | 1989 | Active |
| Dos Amigos Construction | B | 2021 | Active |
| Doumit Construction Inc | A | 2001 | Active |
| DPR Construction A General Partnership | A, B + C2, C8, C9 +3 | 2021 | Active |
| Dpr-Sundt A Joint Venture | B | 2022 | Active |
| Dr General Engineering | A | 2024 | Active |
| Dream Builder Construction + Development | B + C10 | 2019 | Active |
| Dyer Construction Inc | A, B | 1992 | Active |
| DZ Build | B | 2026 | Active |
| E & L Builders LLC | B + C20 | 2026 | Active |
| E2w Construction Inc | B | 2024 | Active |
| Eagle Builders | B2 | 2023 | Active |
| Eccl Solutions Inc | A, B + C10 | 2025 | Active |
| Eco - Alpha Environmental And Engineering Services Inc | A | 2024 | Active |
| Ecoevergreen Construction Services | B | 2023 | Active |
| Edward R Bacon Company Inc | A, B + C10 | 2007 | Active |
| Edwards & Hill Construction Inc | B | 2025 | Active |
| Efficient Energy Solutions Inc | B + C2, C10, C17 +5 | 1978 | Active |
| Eichhorn Construction | B | 2020 | Active |
| Einstein Solutions Inc | B + D16, D28, D62 | 2013 | Active |
| Elevated Construction C | B | 2018 | Active |
| Elevated Home Services | B2 | 2026 | Active |
| Elevation Energy Solutions Inc | B + C10 | 2024 | Renew by Dec 31, 2026 |
| Elevator Technology Inc | B + C11 | 2001 | Active |
| Elite Construction And Remodel | B | 2012 | Active |
| Elite Construction Group Inc | B | 2024 | Active |
| Elite Precision Construction LLC | B | 2017 | Active |
| Elite Service Experts Inc | B + C10, C27, C36 +1 | 2017 | Active |
| Elliott PM Inc | B | 2020 | Active |
| Ellis L G Plumbing Inc | A + C4, C16, C20 +3 | 1979 | Active |
| Emerald Site Services Inc | A + C27 | 2012 | Active |
| Emira Construction LLC | B | 2023 | Active |