| Caisteal Homes Inc | B | 2025 | Active |
| Cal - Best Construction Co Inc | B | 2012 | Active |
| Calco Construction Services Inc | A, B + C21, C35 | 2010 | Renew by Nov 30, 2026 |
| Caliba Inc | A, B | 1992 | Active |
| Calidad Construction | B | 2014 | Active |
| California Auger Boring Inc | A + D09 | 2009 | Active |
| California Boring Inc | A | 2009 | Active |
| California Gate And Entry Systems | B + C7, C10, D28 | 1987 | Active |
| California Locating Services Inc | A | 2010 | Active |
| California Luxury Home Remodeling Inc | B | 2022 | Active |
| California Signature Kitchen Bath & Flooring Inc | B + C6, C15, C54 | 2026 | Active |
| Caloft | B | 2012 | Renew by Dec 31, 2026 |
| Camacho's Construction Corp | B | 2025 | Active |
| Canyon Concrete Cutting Inc | A + D06 | 2007 | Active |
| Castleton Development And Management Inc | B | 2012 | Active |
| Centerpointe Contractors | B + C2, C9 | 1989 | Active |
| Champion Property Services | B + C39 | 2021 | Active |
| Chau's Construction Inc | B | 2022 | Active |
| Chief Construction Services Inc | B + C36 | 1993 | Active |
| Childs Play | A, B | 1997 | Active |
| Chorak Enterprises Inc | A, B + C9 | 2011 | Active |
| City Renovation | B | 2022 | Active |
| Clear Blue Environmental | A + HAZ | 2017 | Active |
| CNC Builders Inc | B | 2018 | Active |
| Coast 2 Coast Plumbing Inc | B + C36 | 2007 | Active |
| Coastal Kitchen & Bath Remodeling Inc | B + C6 | 2015 | Active |
| Coleman Environmental Engineering Inc | A + C21, C31, C49 | 1999 | Active |
| Concrete Cutting Services | B + D06 | 1990 | Active |
| Construction Solutions & Remodeling | B | 2020 | Active |
| Continental Concrete Cutting Inc | B + C8, D06 | 1995 | Active |
| Continental Design Build Inc | B + C20, HAZ | 1971 | Active |
| Control Air Enterprises LLC | B + C2, C4, C10 +3 | 2019 | Active |
| Cook Quality Construction Inc | B | 2018 | Active |
| Cooper Andrew D Company | B + C20, C36 | 1963 | Active |
| Coorg Corporation | A, B + C39, C51 | 1991 | Active |
| Coventry Construction Services Inc | B + C36 | 2025 | Active |
| Creative Building | B + C54 | 2024 | Active |
| Creative Construction Solutions LLC | B | 2021 | Active |
| Cura Construction Services | B | 2022 | Active |
| Custom Painting And Decorating Inc | B + C33 | 2018 | Active |
| Davart Pro Construction & Plumbing Inc | B + C36 | 2020 | Active |
| Davidson Steve Construction Inc | B | 1981 | Active |
| De Hoop Company Inc The | B | 1973 | Active |
| De Investment LLC | B | 2024 | Renew by Dec 31, 2026 |
| De La Riva Construction Inc | B + C21 | 2006 | Active |
| Deb Construction L L C | B | 1979 | Active |
| Declark Construction Inc | B | 2015 | Active |
| Del Ray Development Inc | B | 2014 | Renew by Nov 30, 2026 |
| Delta Floors Carpet One Floor & Home | B + C15, C54 | 2003 | Active |
| Details CC Inc | B + C6, C15 | 2008 | Renew by Dec 31, 2026 |
| Di Franco Stone Specialist | B + C8, C54 | 2004 | Active |
| Diaz Design And Remodel Inc | B | 2021 | Active |
| Diaz R D Construction Inc | B | 2000 | Active |
| Dickman Construction Inc | B | 2025 | Active |
| Dimaggio Construction | B | 2018 | Active |
| Dinamic Mod Construction Inc | B | 2008 | Active |
| Diversified Thermal Services LLC | B + C10, C20, C38 | 1991 | Active |
| Donco & Sons Inc | B + C10, C45, D40 | 1983 | Active |
| Donssen Construction Inc | B | 2026 | Active |
| DPK General Engineering Inc | A, B | 2016 | Active |
| Dreyfuss Builders,llc | B | 2022 | Active |
| DRS Contracting | A + C12 | 2018 | Renew by Dec 31, 2026 |
| Dumarc Corporation | A, B | 1957 | Active |
| Dust Collector Services Inc | B + D34 | 1994 | Active |
| Dymond Builders Inc | B | 2004 | Active |
| E C Applications LLC | A + D12 | 2015 | Active |
| E C G Companies Inc | B + C51 | 2013 | Active |
| Earth & Sun Construction Inc | B + C20, C33, C36 | 2020 | Active |
| Earth Basics Contracting Corporation | A | 1994 | Active |
| Easterday Building Maintenance | B | 2024 | Renew by Dec 31, 2026 |
| Easy Build Construction Inc | B | 2023 | Active |
| Eco Home Solutions | B + C20, C36 | 2014 | Active |
| Ecogreenvision LLC | B | 2020 | Active |
| Edessa Construction Inc | A, B + C10, C33, D06 | 2001 | Active |
| Effective Builds | B + C36, HAZ | 2022 | Active |
| Electrician Services Corp | B + C10, C20 | 2005 | Active |
| Elevat Construction LLC | B | 2018 | Active |
| Elite Construction | B + C10 | 2021 | Active |
| Elite Construction And Manufacturing Inc | B | 2016 | Active |
| Elite Installs Inc | B + D03 | 2023 | Active |
| Elite Modern Builders LLC | B + C10 | 2020 | Active |
| Embers West Inc | B | 2013 | Active |
| Emerald Builders And Developers | B | 2020 | Active |
| Empire Design & Build LLC | A, B | 2020 | Renew by Nov 30, 2026 |
| Energy Core Construction | B + C17 | 2018 | Active |
| Environmental Remediation Contractors Inc | B + ASB, C21, C22 +1 | 2002 | Active |
| Erosion Control Applications Inc | A + C27, D12 | 2007 | Active |
| Esquivel Remodeling Inc | B | 2020 | Active |
| Eun Hye Contractor Inc | B | 2019 | Active |
| Evergreen Glass And Aluminum | B + C17 | 2011 | Active |
| Everyday Patio Inc | B + D03 | 2020 | Active |
| F R Construction Inc | A, B + HAZ | 2004 | Active |
| F W A General Construction Inc | B | 2022 | Active |
| Facility Builders & Erectors Inc | A, B + C43, C51 | 1993 | Active |
| Falcon Hill Construction Inc | A, B + C16, C27, C53 | 2002 | Renew by Nov 30, 2026 |
| Fantastic General Construction Inc | B + C33 | 2018 | Active |
| Far Builders | B + C10 | 2011 | Active |
| Far East Innovation And Construction | B | 2015 | Active |
| Far Solutions Inc | B | 2026 | Active |
| Farwest Insulation Contracting | A + ASB, C2, C22 +2 | 2004 | Renew by Dec 31, 2026 |