| Killen Enterprises Inc | B | 2007 | Active |
| Kinetics Mechanical Service Inc | A | 2007 | Active |
| Kinetics Mechanical Service Inc | B + C20, C36, C38 | 1998 | Renew by Dec 31, 2026 |
| Kitchen Fantastic | B | 2017 | Active |
| L C Construction LLC | B | 2014 | Active |
| Lancar Development Inc | B | 1997 | Active |
| Landmark Exteriors | B | 1992 | Active |
| Lci Green Construction Inc | B | 2016 | Active |
| Left Coast Construction | B | 2010 | Active |
| Lilja Corp | A + C10 | 1992 | Active |
| Logistics Engineering And Design Inc | B + D24 | 1993 | Active |
| M C H Electric Inc | A + C10 | 1992 | Active |
| M&G Grading & Excavation | A | 2025 | Active |
| Marshall Brothers Enterprises Inc | A + C27 | 2010 | Active |
| Matarazza Incorporated | B | 1998 | Active |
| MC Donald Ross Company Inc | B + D34 | 1975 | Active |
| McGrath Rentcorp | B | 1983 | Active |
| Milano Construction & Stone Inc | B + C54 | 2023 | Active |
| MJ Repairs & Installations LLC | B | 2024 | Active |
| Moran Roofing And Inspection Company Inc | B + C39 | 1979 | Active |
| Mountain Cascade Inc | A + HAZ | 1982 | Active |
| MSL Construction And Management Inc | B | 2025 | Active |
| Norcal Construction & Development Inc | B | 2008 | Active |
| Norcal Made Inc | B + C10, C47 | 2025 | Active |
| Norcal Restoration & Remediation Inc | B + D64 | 2023 | Active |
| Northern California Nail Company Inc | B | 1991 | Active |
| Nu Rev Communications Inc | B + C7 | 2011 | Active |
| O'Neill J M Inc | B | 1983 | Active |
| Omni Mechanical Solutions | B + C20, C38 | 2017 | Active |
| On Site General Engineering Inc | A | 2015 | Active |
| On Top Construction Inc | B | 1989 | Active |
| On-Site Commercial Services Inc | A, B | 2009 | Active |
| Orth Construction Inc | B | 1998 | Active |
| P F C Remodeling Inc | B | 1989 | Active |
| Pacheco Landscape & Construction Inc | A + C27, C33 | 1983 | Active |
| Payne Robert Construction Inc | B | 2015 | Active |
| Plate Line Framers Inc | B | 2000 | Active |
| Platinum Pipeline Inc | A | 2006 | Active |
| Point One Electrical Systems Inc | B + C7, C10 | 1998 | Active |
| Pranschke Construction LLC | B | 2022 | Active |
| Presidio Systems Inc | A + C10 | 2004 | Active |
| Prime Mechanical Service Inc | B + C4, C20, C36 +1 | 2003 | Active |
| Primitivo Construction Inc | B | 2009 | Active |
| Pringle R Construction Inc | B | 2021 | Active |
| Proforma Construction Inc | A, B + C9 | 2009 | Active |
| Purus Inc | B + C7, C10, C28 | 2019 | Active |
| QRS Remodeling Inc | B | 2019 | Active |
| Quick Set Construction Co Inc | B | 1988 | Active |
| R S Q Construction Services Inc | B | 1996 | Active |
| Randazzo Constructions Inc | B | 1983 | Active |
| Red Top Electric Co Emeryville Inc | B + C7, C10 | 1959 | Active |
| Remedy Building Services LLC | B | 2024 | Active |
| Restoration Management Company | B + ASB, C15, C22 | 1999 | Active |
| Ronbow Corporation | B | 2022 | Active |
| Roofmax | B + C2, C39 | 2004 | Active |
| S B C Silveira Built Customs LLC | B | 2025 | Active |
| S K Contracts Inc | B | 1997 | Active |
| S Wang General Contractor | B | 2021 | Active |
| Safeco Builders Inc | B | 1981 | Active |
| Sansei Gardens Inc | A + C8, C27 | 1974 | Renew by Dec 31, 2026 |
| Shames Construction Company LTD | B | 1988 | Active |
| Shamrock Development & Construction Inc | A, B | 2007 | Active |
| Simply Better Remodels | B | 2008 | Active |
| Sine Metu Services Corp | B, B2 | 2024 | Active |
| Smith Denison Construction Co | A, B + C10, C36 | 1990 | Active |
| SMP Construction & Maintenance LLC | B + C8, D06, D12 +2 | 2026 | Active |
| Sosa Kitchen & Bath Remodeling | B + C54 | 1987 | Active |
| Spacetone Acoustics Inc | B + C2, C9 | 1981 | Active |
| Sposeto Engineering Inc | A + C8 | 1975 | Active |
| Synergy Power | B + C10 | 2017 | Active |
| T D W Construction Inc | A | 1985 | Active |
| Tenant Improvement Construction & Consulting Inc | B | 2005 | Active |
| Tennyson Electric LLC | A + C7, C10 | 1996 | Active |
| The Driveway Co | B + C27 | 2018 | Active |
| Today's Kitchen & Bath | B | 2015 | Active |
| Triangle Construction Tri - Valley Inc | B | 2006 | Active |
| Trinity Perfect Construction Inc | A, B | 2017 | Active |
| Tritek Construction Inc | B + C5, C6 | 1981 | Active |
| TWC Global Inc | B | 2023 | Active |
| Unique Environments | B + C27 | 1989 | Active |
| Universal Cell Site Services Inc | B | 2009 | Active |
| Valdez Property Construction LLC | B | 2024 | Active |
| VC & KW Builders | B | 2017 | Active |
| Vigus & Miller Construction Inc | B | 1992 | Active |
| W M A Landscape Construction Inc | A, B + C8, C27, D59 | 2011 | Active |
| Western Abatement Inc | A + C21, C22, HAZ | 1990 | Active |
| Wilcon Inc | B + C36 | 2001 | Active |
| World Exteriors Inc | B + C39 | 2010 | Active |
| Your Energy Solutions | B + C10, C20, C39 | 2009 | Active |
| Z Lab Installation Inc | B + C6 | 1994 | Active |