| Land & Sea Diving Services LLC | A | 2024 | Active |
| Leggett Construction Inc | B | 1988 | Active |
| Levanta Ge | A | 2024 | Active |
| Luke Construction Corp | B + C35 | 2004 | Active |
| M 3 General Engineering Inc | A | 2018 | Active |
| M H Building Inc | B | 2005 | Active |
| Mabry Construction Inc | B | 1989 | Active |
| Maib Construction Company Inc | B | 2019 | Active |
| Mario Custom Builder Inc | B | 2014 | Active |
| Mavericks Builders Inc | B | 2018 | Active |
| MC Construction And Concrete LLC | B + C8 | 2001 | Active |
| MC Daniel Mechanical Construction Inc | A + C36, C60 | 1996 | Active |
| McCollister Robert Construction Inc | B | 2010 | Active |
| Modern Method Roofing Co Inc | B + C39 | 1995 | Active |
| Mogino Group Inc | B | 2022 | Active |
| Moore Creative Construction Inc | B + C54 | 2002 | Active |
| Mr Rooter Plumbing | A, B + C36, C42 | 1987 | Active |
| Napa Build Inc | B | 2019 | Active |
| Napa Recycling & Waste Services LLC | A | 2019 | Active |
| Napa Valley Builders | B | 2011 | Active |
| Napa Valley Builders Co LLC | B | 2019 | Active |
| Napa Valley Dream LLC | B | 2009 | Active |
| Napa Valley Roofing & Construction LLC | B + C39 | 2000 | Active |
| New Visions Building & Specialties Inc | B | 1984 | Active |
| Nivco Construction Corporation | B | 1994 | Active |
| Noble House Construction & Development Inc | B | 2019 | Active |
| Nova Designs Builds Inc | B | 2001 | Active |
| Nova Group Inc | A, B + C10 | 1976 | Active |
| Nova Probst A Joint Venture | A + C10 | 2017 | Active |
| O'Brien Builders | B | 1981 | Active |
| Oak Design And Build | B + C27 | 2024 | Active |
| Oak Knoll Group The | B + C36, D39 | 2022 | Active |
| Oakville Pump Service Inc | A, B + C10, C16, C36 +3 | 1998 | Active |
| Paradise Pools And Landscapes Inc | B + C27, C53 | 1984 | Renew by Dec 31, 2026 |
| Pathway Home Solutions Inc | B | 2025 | Active |
| Peck & Hiller Company | B + C8 | 1949 | Active |
| Perfection Carpentry Inc | B | 2020 | Active |
| Pivotal Ground Inc | B | 2025 | Active |
| Plaka Construction Inc | B | 2018 | Active |
| Pridmore Brothers Construction Inc | A, B | 1979 | Active |
| Pridmore Construction LLC | A | 2019 | Active |
| Pridmore Don & Son Construction Inc | A + C10 | 1989 | Active |
| Pursell Brad General Engineering Inc | A | 2019 | Active |
| Quality Incorporated Site Work & Underground | A | 1991 | Active |
| Quality Works Construction LLC | B | 2025 | Active |
| R & M Grading Inc | A + C12 | 1996 | Active |
| R & R Maher Construction Company Inc | A, B + C8 | 1987 | Active |
| R & Son Construction Inc | B | 2025 | Active |
| R D & Sons Builders Inc | B | 1991 | Active |
| R Heritage Design Build Inc | B | 2024 | Active |
| R N R Concrete Inc | B + C8 | 2020 | Active |
| Rabbitt Henry J & Sons Inc | B | 1981 | Active |
| Real Time Production LLC | B | 2011 | Active |
| Regan & Sons Incorporated | B | 1984 | Active |
| Remodeling Specialties By Roldan | B | 2006 | Renew by Nov 30, 2026 |
| Robben Rick Construction LLC | B | 2019 | Active |
| Rodman Paul Construction Inc | B | 2005 | Active |
| Roots Strong Builder | A, B + C5, C8 | 2026 | Active |
| Rootstock Development | B | 2016 | Active |
| Roscoe Inc | B | 2022 | Active |
| Rose General Contracting Inc | B | 2014 | Active |
| Rossi Residential Construction Inc | B | 2004 | Active |
| Ruiz Roofing | B + C39 | 2026 | Active |
| Sax And Roscoe Construction Inc | B | 2002 | Active |
| Sax Construction Inc | B | 1999 | Active |
| Schindler Judy Design & Build Inc | B | 2004 | Active |
| Shaw Curtis Construction Inc | B | 2020 | Active |
| Sherwood Inc | B | 2007 | Active |
| SKN Construction Inc | B + C36 | 2020 | Active |
| Slarve Construction LLC | B | 2018 | Active |
| SLP Construction Inc | B | 2017 | Active |
| Smart Finish | B | 2014 | Active |
| Smartbuilt Inc | B + C10, C27, C46 | 2025 | Active |
| Specialized Construction And Fabrication Inc | B | 2020 | Active |
| Specialized Storage Solutions Inc | B | 2026 | Active |
| Stagner Construction Inc | B | 1995 | Active |
| Standard HVAC | B + C20 | 2007 | Active |
| Steve Silva Plumbing Inc | B + C16, C36 | 1985 | Active |
| Stockhome Construction LLC | B | 2026 | Active |
| Studio D'Arte Inc | B + C33 | 2004 | Renew by Nov 30, 2026 |
| Sullivan Construction And Home Repair Inc | B | 2009 | Active |
| Tamayo General Construction LLC | B | 2017 | Active |
| TBC Plaster Artisans Inc | B + C35 | 1991 | Active |
| Teresi Construction Corporation | B + C39 | 2017 | Active |
| Titan Builders Corporation | B | 2007 | Active |
| TPM Construction Inc | B | 1995 | Active |
| Troy Heathcote Grading & Landscaping | A + C27 | 1994 | Renew by Dec 31, 2026 |
| Trumble Construction Inc | B | 2006 | Active |
| Tucker Bruce Construction Inc | B | 2006 | Active |
| Utility & Site Inc | A + C7 | 1989 | Active |
| Uva Country Construction Inc | B | 2017 | Active |
| Vega Builders Inc | B | 2024 | Active |
| Vino Design Build | B | 2017 | Active |
| Vivan Construction Inc | B | 2002 | Active |
| W F Maudru Construction Inc | B | 2021 | Active |
| Walker Michael Construction Inc | B | 1994 | Active |
| Welsh D T Construction Inc | B | 1978 | Active |
| West C Builders Inc | B | 2006 | Active |
| Whitney & Sons Inc | A, B | 1999 | Active |
| Wine Country Development Inc | B | 2019 | Active |