| C B Custom Contruction Inc | B2 | 2022 | Active |
| C B G Building Company LLC | B | 2015 | Active |
| C C & R Construction | B + C15, C36, C39 | 2002 | Active |
| C C S Proclean | B + C33, D12 | 2017 | Active |
| C L P Construction | B + C6 | 1988 | Active |
| C R G General Construction | B | 2007 | Active |
| Cabinets Galore (Orange County) Inc | B + C6 | 2007 | Active |
| Cairns Craft Remodeling | B | 2007 | Active |
| Cairo Construction Company | A, B | 1970 | Renew by Dec 31, 2026 |
| Cal Pac Development | B | 2003 | Active |
| Cal Pacific Construction & Remodel Inc | B | 2008 | Active |
| Cal Renovation Inc | B | 2026 | Active |
| Cal-Prop Realty Inc | B + C36 | 2020 | Active |
| Calafata Construction And Electric Inc | B + C10 | 2004 | Active |
| Calderon Builders Inc | B + C7 | 2004 | Active |
| Calderon Services Inc | B | 2008 | Active |
| Calegacy Construction Inc | B | 2024 | Renew by Nov 30, 2026 |
| Calframe Construction Inc | B | 2017 | Active |
| Cali Bath And Kitchen | B | 2016 | Renew by Dec 31, 2026 |
| Cali Carpentry And Remodeling Inc | B | 2020 | Renew by Nov 30, 2026 |
| Cali Coast Contractors Inc | A, B + C10 | 2025 | Active |
| Cali Construction Inc | B | 1987 | Active |
| Caliber Construction & Remodeling | B | 2021 | Active |
| Caliber Contracting San Diego | B + C10 | 2024 | Active |
| California Attic & Build Inc | B + C2 | 2023 | Active |
| California Bath & Kitchen | B + D12 | 2000 | Active |
| California Bathrooms Inc | B2 | 2022 | Active |
| California Clean And Seal | B + D06, D12 | 2016 | Active |
| California Coast Builders Inc | B | 2011 | Active |
| California Construction Concepts | B + C39 | 2003 | Active |
| California Construction Superior | B | 2022 | Active |
| California Development & Construction Corp | A, B | 2012 | Active |
| California Home Builders Inc | B | 2001 | Active |
| California Level Up Construction Inc | B | 2026 | Active |
| California Solar Integrators Inc | B + C10, C46 | 2015 | Active |
| Call Glenn Again LLC | B2 | 2023 | Active |
| Callison Construction | B | 2025 | Active |
| Calshah Construction Inc | A | 2023 | Active |
| Caltech Co Inc | A, B | 2011 | Active |
| Cambridge Management Group Inc | B | 2007 | Active |
| Camson Construction LLC | B | 2013 | Active |
| Capstone Concrete | B + D06 | 2005 | Active |
| Cardinal General Contracting Inc | B | 2022 | Active |
| Carlisle Development Inc | B | 1999 | Active |
| Carmel Co Design & Build | B | 2026 | Active |
| Carpenter Rigging & Supply Co | A | 1996 | Active |
| Carrion Construction Inc | B | 1988 | Active |
| Casa Construction | B2 | 2025 | Active |
| Casas Construction | B | 2025 | Active |
| Cascata Construction | B | 2019 | Active |
| Cassidy & Associates Property Maintenance & Development | B | 1996 | Active |
| Cast Build Inc | B | 2024 | Renew by Dec 31, 2026 |
| Caster Properties Inc | B | 2000 | Active |
| Castillo Contracting Company Inc | B + C33 | 2007 | Active |
| Catlin General Contracting | B | 2007 | Active |
| Cats General Engineering | A + C12 | 2001 | Active |
| CBH Construction | B | 2017 | Active |
| CBH Construction Inc | B | 2019 | Active |
| Ccrus Construction | B | 2023 | Active |
| Ceja Builders Inc | B | 2021 | Active |
| Celedon Builders Inc | B | 2015 | Active |
| Centerview Commercial Window Treatments | B + D52 | 2007 | Active |
| Ceramic And Stone Creations Inc | B + C54 | 1993 | Active |
| Certified Group Contracting Inc | B | 2026 | Active |
| Certified Restoration | B + C15, D64 | 2008 | Active |
| Cervantes Enterprises Group Inc | B + C13 | 2009 | Active |
| Cge Builds Inc | B | 2025 | Active |
| Cgo Construction | B | 2008 | Active |
| CH Court Tech Inc | A | 1997 | Active |
| Chadwick Builders | B | 2002 | Renew by Dec 31, 2026 |
| Champion Restoration Inc | B | 2023 | Active |
| Champion Restorations LLC | B | 2023 | Active |
| Chapas Construction Inc | B | 2026 | Active |
| Charlie Dimock Construction Company | B + D64 | 1989 | Active |
| CHC Commercial | B | 2018 | Active |
| Chemco Construction | B | 2019 | Active |
| Chic Design & Remodeling Inc | B | 2023 | Active |
| Chism Commmercial Painting And Contracting | B + C33 | 1986 | Active |
| Choice Construction And Remodeling | B | 2009 | Active |
| Chris O'Malley BLDG | B + C10 | 2007 | Active |
| Christian Contracting Inc | A, B + C8 | 2008 | Active |
| Chrysalis Homes Incorporated | B | 2008 | Active |
| Chung / Bui Construction | B | 2019 | Active |
| Cibrian Construction Inc | B | 2002 | Active |
| Cima Builders LLC | B + C39 | 2021 | Active |
| Cira Construction Inc | B | 2025 | Active |
| Citrine Build Group | B | 2022 | Active |
| Citymark Construction Inc | B | 2001 | Active |
| Cityscapes Construction Inc | B + C27 | 2011 | Active |
| CJS Remodeling Inc | B2 | 2024 | Active |
| CK Spaces | B | 2023 | Active |
| Clark Builders L P | B | 2006 | Active |
| Clark Realty Builders L P | B | 2004 | Active |
| Clarketon Restoration | B | 2021 | Active |
| Clarketon Restoration | B + HAZ | 2022 | Renew by Nov 30, 2026 |
| Classic Builder Inc | B | 2017 | Active |
| Classic Construction | A, B | 2009 | Active |
| Classic Home Contractors Inc | B | 2024 | Active |
| Clear Blue Energy Corp | B + C10 | 2010 | Active |
| Clear Vision Remodelling Inc | B | 2019 | Active |