| 1st Concept Construction Inc | B | 2008 | Active |
| 3gm Builders | B | 2022 | Active |
| 3n Construction Inc | B | 2023 | Active |
| 4 Point Contracting Inc | B | 2024 | Active |
| 40 Plus Home Improvement Inc | B + C20 | 2019 | Active |
| 646 Construction Services | B | 2020 | Active |
| A & O Engineering Construction Inc | A | 1979 | Active |
| A C H C Construction | B | 2018 | Active |
| A O West Contracting Inc | B | 2021 | Active |
| A S L Construction Inc | B | 2022 | Active |
| A To Z Construction | B | 2019 | Active |
| A&A Pro Construction Incorporated | B | 2025 | Active |
| Ab Remodelers Inc | B + C9 | 2002 | Active |
| Access General Contracting Inc | A, B + C8, C12, C36 +1 | 2014 | Active |
| Ace Handyman Services Corona Norco | B + C13, C23 | 2023 | Active |
| Action Acoustics Inc | B + D50 | 1996 | Active |
| Action Repair Service | B + C20, C38 | 1995 | Active |
| Active Plumbing & Rooter Inc | B + C36 | 2021 | Active |
| Advanced Door Assemblies Inc | B + D16, D28 | 2013 | Active |
| Advanced Framing Structures Inc | B | 2010 | Active |
| Affordable Fencing Company | B + C13 | 2007 | Active |
| Ak Electrical Services | B + C8, C10 | 2004 | Active |
| All American Asphalt | A + C12 | 1971 | Active |
| All Americans Precision Construction | B | 2024 | Active |
| All Around Builders LLC | B | 2026 | Active |
| All Star Restoration Inc | B | 2014 | Active |
| Allstate Restoration Management Inc | B | 2021 | Active |
| Almil General Contruction Inc | B | 2026 | Active |
| Alpha Environmental Engineering Construction | A + HAZ | 2015 | Active |
| Alson General Construction | B + C10 | 2022 | Active |
| Alta Construction Incorporated | B | 2007 | Active |
| Alta Contracting | A, B + C21 | 1997 | Active |
| Alvarado Construction & Logistics | B | 2016 | Active |
| Amara Construction Enterprises Inc | B | 2026 | Active |
| American Home Remodeling Inc | B + C36 | 2002 | Active |
| American Innovation LLC | B + C20, C27, C36 | 2023 | Active |
| American Iron Engineering | A | 2023 | Active |
| Ampco Contracting Inc | A, B + ASB, C21, HAZ | 2004 | Active |
| Ams So Cal Builders Inc | B | 2019 | Active |
| Anaya's Construction Services | B | 2025 | Active |
| Aramexx Construction | A, B + C27 | 2011 | Active |
| Arcbuilding Inc | B | 2024 | Active |
| Arizona Pipeline Company | A + C10, C31, C34 +2 | 1982 | Active |
| Arredondo's CL And Fam GC Enterprises | B | 2025 | Active |
| Artisan Premier Inc | B | 2016 | Renew by Nov 30, 2026 |
| Asphalt Paving Systems Inc | A | 2022 | Renew by Nov 30, 2026 |
| Averra Contracting Inc | B | 2026 | Active |
| Axl General Building Co | B | 2021 | Active |
| Aztec Electric | B + C10 | 1997 | Active |
| Aztecs Telecom Inc | A, B + C7, C10 | 2007 | Active |
| B C B Construction And Investments Inc | B | 2015 | Active |
| B C C Contracting Inc | B | 2009 | Active |
| Backstrom & Son's Framing | B | 2024 | Active |
| Baghouse And Industrial Sheet Metal Services | A, B + C16, C43 | 1992 | Active |
| Baseband Telecom Corporation | A + C10, C34, C36 | 2020 | Active |
| BCRR LLC | B | 2023 | Active |
| Beelders Group | B | 2025 | Active |
| Benchmark Renovations | B | 2023 | Active |
| Bis Construction Inc | B | 1990 | Active |
| BJ Culver Construction Inc | B | 1998 | Active |
| Blackstone W M Construction | B | 2016 | Renew by Oct 31, 2026 |
| Boberg Engineering & Contracting Inc | A + C12, C21 | 2002 | Active |
| Boudreau Construction Inc | A | 2022 | Active |
| Boudreau Pipeline Corporation | A + C10, C34, C36 | 2001 | Active |
| Brady Commercial Construction Services Inc | B | 1995 | Active |
| Bravo Patio Covers | B + D03 | 2017 | Active |
| Brayer Construction Services Inc | B | 2018 | Renew by Oct 31, 2026 |
| BRB Construction | B | 2026 | Active |
| Build It | B | 2026 | Active |
| C & K General Contracting Inc | B | 1988 | Active |
| C C K Builders Inc | B | 2005 | Active |
| C K R Home Corporation | B | 2023 | Active |
| C P R Builders Inc | B | 2019 | Active |
| C S P S Inc | B + C32 | 2020 | Active |
| Cal Elite Underground Inc | A | 2022 | Active |
| Cal Empire Engineering Inc | A | 2016 | Active |
| Cal Star Mobile Home Construction Inc | B + C47 | 2013 | Active |
| Calcom Roofing Inc | B + C39 | 2012 | Active |
| California Builders Bros Inc | B + C10 | 2024 | Active |
| Calvillo Construction Corp | B | 2011 | Active |
| Cantilever Incorporated | B | 2000 | Active |
| Carmelita Enterprises Inc | B | 2025 | Active |
| Casa Valenzuela Construction Inc | B + C13 | 2017 | Active |
| Casey Enterprises | B + C10 | 2006 | Active |
| Charge Bliss Inc | B | 2024 | Active |
| Claiborne Construction | B | 2024 | Active |
| Classic Customs Inc | B | 2006 | Active |
| Classic Handyman Services | B + C16, C20, C36 | 2017 | Active |
| Clinton Homes Inc | B + C9 | 2006 | Active |
| Company The | A | 2013 | Active |
| Complus - Nova Creations Construction | B | 2025 | Active |
| Construction Services And Maintenance | B + C33 | 2009 | Active |
| Construlux Inc | B | 2016 | Active |
| Contrast Services LLC | B + D12 | 2012 | Active |
| Cooper Engineering Incorporated | A | 1989 | Active |
| Cordoba Construction Corp | B + D28 | 1988 | Active |
| Core & Main LP | A | 2022 | Active |
| Core Resource Services LLC | B + C31 | 2024 | Active |
| Core Tree Care LLC | A, B + C31, C49 | 2016 | Active |
| Cornerstone Capital Development Services Inc | B | 2016 | Active |