| A 2 Z Restoration | B + D64 | 2017 | Active |
| A I X Construction Inc | B | 2016 | Active |
| Absolute Plumbing And Drain | A, B + C31, C34, C36 | 2007 | Active |
| Advanced Trenchless Inc | A, B + C36, C42 | 2012 | Active |
| All Contract Inc | B | 2022 | Active |
| All Heart Construction Inc | B | 1994 | Active |
| All Things Interior Inc | B | 2004 | Active |
| Anstirman Construction Inc | B | 2023 | Active |
| Apex General Construction And Renovations | B | 2024 | Active |
| Armando Sanchez Construction | B + C8 | 1997 | Active |
| Baja Construction Co Inc | B + C51 | 1981 | Active |
| Baldwin Construction LLC | B2 | 2025 | Active |
| Ballentine Construction Services | B | 2024 | Active |
| Bay Area Reconstruction Services | B | 2023 | Active |
| Bay Counties General Contractors LLC | B | 2025 | Active |
| Bel Air Mechanical Inc | B + C4, C10, C20 +3 | 2004 | Active |
| Bocce Builders Of America | A | 1986 | Active |
| Boydstun Construction Inc | B | 1999 | Active |
| Brown Robert L Construction Inc | B | 1979 | Active |
| BRP Enterprises LLC | B | 2025 | Active |
| Busby Scott Construction Inc | A, B + C17 | 2009 | Active |
| C D & Power | A + C10 | 1998 | Active |
| C Fer Construction Inc | B + C8 | 2019 | Active |
| Calco Partners Inc | A | 2025 | Active |
| Calixto Construction Group Inc | B | 2026 | Active |
| Calseismic Construction Inc | B | 2023 | Active |
| Clean Lakes Inc | A | 2002 | Active |
| Cold Temp Solutions | B + C20, C38 | 2018 | Active |
| Construction West Services Inc | B | 2011 | Active |
| Contra Costa Electric Inc | A, B + C10 | 1953 | Active |
| Cowan & Thompson Construction Inc | A + C12 | 1990 | Active |
| Crader Construction Services Inc | B | 2006 | Active |
| Dabri Inc | B | 2002 | Active |
| Danville Home Repair And Remodeling | B | 1999 | Active |
| Darrah Trucking & Excavating Inc | A | 2008 | Active |
| Diablo Valley Engineering Inc | A | 2016 | Active |
| Dobson Construction Incorporated | B | 2009 | Active |
| E A C Quality Construction Inc | B | 2022 | Active |
| Eisen Environmental And Construction Services | B + ASB, C22 | 2006 | Active |
| Engineering Remediation Resources Group Inc | A + C21, C22, HAZ | 1997 | Active |
| Euro American Construction | B | 2026 | Active |
| Farr James H Construction Incorporated | B | 1980 | Active |
| FCR Fence & Deck | B + C13, C27 | 2011 | Active |
| Finesse Builder Inc | B | 2017 | Active |
| Gilbert E E Construction Inc | A | 2001 | Active |
| Gim Builder | B | 2021 | Active |
| Gipson Construction LLC | B + C10, C16 | 2025 | Active |
| GLV Contractors Inc | B | 2025 | Active |
| Griffs Construction Services | B | 2024 | Active |
| Gusco Building Maintenance Inc | B | 2018 | Active |
| H M Concrete Inc | A + C8 | 1996 | Active |
| Holland Brooks Builders Inc | B | 2012 | Active |
| Ironrock Builders | A, B | 2022 | Active |
| J B R Builders Inc | B + D41 | 2023 | Active |
| J R E Construction LLC | B | 2020 | Active |
| JC Services Corp | B + C33 | 2022 | Active |
| JFC Construction Inc | A, B | 1990 | Active |
| Justice Construction Co | B | 1977 | Active |
| K Bali Construction Inc | B | 2011 | Active |
| Kepkee Construction Inc | B | 2024 | Active |
| Kiowa Construction Inc | B | 2026 | Active |
| Lci Langsdale Construction Inc | B | 2021 | Active |
| Level A Solutions Inc | A | 2009 | Active |
| Loebel T R Construction | A | 2004 | Active |
| Lucas J V Paving Inc | A + C12 | 1960 | Active |
| Lucas Paving Inc | A, B + C21 | 2014 | Active |
| Mario Mazzamuto Construction | B | 2024 | Active |
| Martinez Sheet Metal Inc | B + C4, C20, C36 +2 | 1963 | Active |
| Mason BPP Inc | B + C2, C20 | 2017 | Active |
| Mazzamuto Construction Inc | B | 2024 | Active |
| McKay Alan Construction Inc | B | 2019 | Active |
| Mse Environmental Inc | A, B + ASB, C22, HAZ | 2009 | Active |
| Niche Construction | B | 2018 | Active |
| North By West Construction Inc | B | 2019 | Active |
| Northington Innovations Inc | B | 2001 | Active |
| O'Hara Scott Construction Inc | A, B | 1997 | Active |
| One Stop Shop Construction | B | 2012 | Active |
| P G Emminger Inc | B + C6 | 1983 | Active |
| Pacific Underground Services | A + HAZ | 1996 | Active |
| Pair-A-Dice Builders Inc | B | 2015 | Active |
| Pars Home Improvement Inc | B | 2025 | Active |
| Past The Gate | B + C27 | 1999 | Active |
| Progreso Construction | B | 2021 | Active |
| Prorenovating | B | 2015 | Active |
| Prosiding Inc | B + D41 | 2004 | Active |
| Q G L Inc | B + C27 | 1997 | Active |
| R K L Builders | B + C36 | 2016 | Active |
| Ramon's Home Improvement Services Inc | B | 2012 | Active |
| Rangel G L | B | 1993 | Active |
| Redo House LLC | B2 | 2026 | Active |
| Reedco Building Innovations Inc | B | 2014 | Renew by Nov 30, 2026 |
| Ricker Thermline Incorporated | B | 1990 | Active |
| RM General Construction | B | 2015 | Active |
| S R Construction And Landscape Inc | B + C27 | 2011 | Active |
| Searls And Son Builders Inc | B | 1985 | Active |
| Sonnikson And Stordahl Construction | A + HAZ | 1993 | Active |
| Soria Construction Inc | B | 2009 | Active |
| St Germain Shawn Construction Inc | B | 2001 | Active |
| Stevens - Hemingway - Stevens Construction | B | 1997 | Active |
| Straight Line Imports Inc | B | 2001 | Active |