| 99 North Construction & Plumbing Inc | B + C36 | 2018 | Active |
| 99 North General Engineering | A, B + C10, C16, C20 +1 | 2023 | Active |
| A & J Fencing | B + C13 | 2006 | Active |
| A Cut Above Builders Inc | B | 2019 | Active |
| A To Z Electric LLC | B + C10 | 2013 | Active |
| A-S Pipelines Inc | A | 1982 | Active |
| Aames Home Improvement | B + C17 | 2006 | Active |
| Aaron Chapman Builders Inc | B | 2005 | Active |
| Aci Inc | B | 2026 | Active |
| Acustruct | A, B + C10, C50 | 2002 | Active |
| Adval Construction Inc | B | 2019 | Active |
| Advance Construction And Development Inc | B | 1982 | Active |
| Agt Builders Inc | B | 2026 | Active |
| Airtight Construction Inc | A, B + C39 | 2003 | Active |
| Aloha Concrete And Design | B + C8 | 2019 | Active |
| American Refrigerant Services Inc | B + C10, C20 | 1966 | Active |
| Anderson Home Solutions Inc | B + C2 | 2016 | Active |
| Aniv Construction | B | 2026 | Active |
| Anro Inc | B + C54 | 2009 | Active |
| Apartment Renovation Specialists Inc | B | 2014 | Active |
| Apex Grading Inc | A + C12 | 2001 | Active |
| Armandillo Craft Building Inc | B | 2026 | Active |
| Arp Intl Inc | B | 2017 | Active |
| Arrowhead Contracting Company | A | 2026 | Active |
| Artbuild Contractor Inc | B | 2026 | Active |
| Ash Bay Construction Inc | B | 2023 | Active |
| B C McCosker Construction Inc | A, B | 1992 | Active |
| B L S Contractors Incorporated | B + C27, C39 | 1990 | Active |
| B M T Construction And Maintenance Inc | B | 2018 | Active |
| B S M Construction Inc | B + C10, C27, C39 | 2003 | Active |
| Bam Construction And Development Inc | B | 2019 | Active |
| Bay Area Drainage Inc | A + C12, C27 | 1999 | Active |
| Bay Area Earthworks Inc | A + C12, C21 | 2021 | Active |
| Bay Area Greenscapes Inc | A + C12, C27 | 2009 | Active |
| Bay Area Spartans Construction | B | 2019 | Active |
| Bay Cities Paving & Grading Inc | A + C21, HAZ | 1965 | Active |
| Bay Cities/Myers & Sons Joint Venture | A | 2024 | Active |
| Bay Crest Construction | B | 2023 | Active |
| Bay Valley Roofing | B + C12, C39 | 2013 | Active |
| Bay View Building And Remodeling | B | 2026 | Active |
| Bayside Contractors | B + D06 | 2009 | Active |
| Bayside Insulation & Construction Inc | B + C2 | 2014 | Active |
| BCR Construction Corporation | B | 2025 | Active |
| Bear River Builders Incorporated | B | 2007 | Active |
| Black Diamond Residential Remodeling Inc | B2 | 2022 | Active |
| Blueline Engineering Inc | A, B + C6 | 2010 | Active |
| BMC Co Inc | B | 2014 | Active |
| Bosco Development & Construction Inc | B | 2026 | Active |
| Bracelin Company | B | 2007 | Active |
| Brown Nick Construction Inc | B | 2012 | Active |
| Building Services / System Maintenance Incorporated | B + C10, C27, C39 +1 | 2006 | Active |
| Burton Underground Inc | A, B | 2008 | Active |
| C C R Construction Inc | B | 1988 | Active |
| C N D Construction Company Inc | B | 2021 | Active |
| C T E Group | B | 2004 | Active |
| Cal-Neva Environmental Systems | B + C4, C10, C20 +1 | 1978 | Active |
| Cali Home Constructors | B | 2026 | Active |
| California Highway Construction Group Inc | A, B | 2017 | Active |
| Carbone Construction Inc | B | 2014 | Active |
| Carone & Company Inc | A, B + HAZ | 1995 | Active |
| Carrasco Construction Inc | B | 2001 | Active |
| Caspian C Drywall Construction | B + C9 | 2025 | Active |
| Cemcon Inc | B + C8, D06 | 2008 | Active |
| Cesar's Construction & Handyman Services Inc | B | 2016 | Active |
| Christensen Brothers Construction Company | B + C5, C6 | 2000 | Active |
| Cloverwood Construction Inc | B | 2024 | Active |
| Clyde Ned Construction Inc | A | 1981 | Active |
| Complete Plumbing And Construction | B + C16, C36 | 2020 | Active |
| Conco | A, B + C8, C50, C51 +2 | 1961 | Active |
| Concord Carpet And Hardwood Inc | B + C15 | 2014 | Active |
| Considerate Contracting Inc | B + C36 | 2012 | Active |
| Contra Costa Roofworks Inc | B + C39 | 1996 | Active |
| Cornerstone Environmental Contractors Inc | A + C10, D21, HAZ | 1996 | Active |
| Cornerstone Home Improvements | B | 1996 | Active |
| Current Electric & Lighting Inc | B + C10 | 2002 | Active |
| D & D Learning Spaces | B + D34 | 2004 | Active |
| D C C Construction LLC | B | 2024 | Active |
| D R B Construction Inc | B | 2006 | Active |
| D R V Remodeling & Construction | B | 2024 | Active |
| D Squared Construction | B | 2014 | Active |
| Daveo Inc | B | 2025 | Active |
| De Nova Homes Inc | A, B | 1999 | Active |
| Decorayal Remodeling Inc | B2 | 2026 | Active |
| Delamar Construction Corp | B | 2022 | Active |
| Devengenzo & Company | A, B + C27 | 1989 | Active |
| Diablo Custom Screen | B + C17 | 1997 | Active |
| Diablo Telecom & Construction Inc | B + C10 | 2022 | Active |
| Dino's Contracting Inc | B | 1999 | Active |
| Discovery Builders Inc | A, B | 1998 | Active |
| Diverse Trade Services Inc | B + C39 | 1989 | Active |
| DMZ Builders | A, B + C10, C21 | 2013 | Active |
| Dmz/Comstock JV | A + C10 | 2026 | Active |
| Dorantes J Construction | B | 2019 | Active |
| E J & A Handyman And Remodeling Services | B | 2019 | Active |
| E-Z Builds Inc | B | 2024 | Active |
| Eco-Construction & Electric Corp | B + C10 | 2007 | Active |
| Elevate Kitchen & Bath Inc | B | 2008 | Active |
| Encompass Construction Development Group Inc | A, B + C10, C33 | 2019 | Active |
| Engineered Construction Services Corp | A, B + C17 | 1995 | Active |
| Enterprise Roofing Service Inc | B + ASB, C20, C39 +1 | 1963 | Active |