| Nicaragua Remodel Inc | B2 | 2025 | Active |
| NK Building Construction Group Inc | B + C10 | 2015 | Active |
| NKC Builders Inc | B + C10 | 2026 | Active |
| Norcal Bay Construction Inc | B + C20, C36 | 2019 | Active |
| Norcal Construction & Maintenance Inc | B + C33, D06 | 2001 | Renew by Dec 31, 2026 |
| Norcal Construction Group Corporation | B | 2015 | Active |
| Norcal Custom Builders And Construction Inc | B | 2017 | Active |
| Norcal General Construction Corporation | A + C10 | 2008 | Active |
| Norhausen Incorporated | B | 1988 | Active |
| North Current Builders Inc | B | 2014 | Active |
| North Side Of The City LLC | B | 2026 | Active |
| Northern California Construction Services Inc | B | 2010 | Active |
| Northern Path Construction Inc | B | 2026 | Active |
| Northern Vintage Construction | B | 2010 | Active |
| NTS Construction | B | 2014 | Active |
| Nuhome Remodeling | B | 2020 | Active |
| NW Sunstars Construction Inc | B | 2022 | Active |
| O & M Construction LLC | B | 2023 | Active |
| O G G Builders Inc | B | 2023 | Active |
| O'Maoinagh Brian Construction Inc | B | 2017 | Active |
| Oak Hammer Construction Inc | B | 2023 | Active |
| Ocean General Contractors LLC | B | 2025 | Active |
| Ocegueda Builders Inc | B | 2016 | Active |
| Odyssey GC LLC | B | 2019 | Active |
| Omni Sheet Metal Inc | B + C43 | 2005 | Active |
| On - Site Construction Inc | B + C27 | 2003 | Active |
| On Design & Remodeling Inc | B | 2021 | Active |
| One Call Construction And Remodeling Inc | B | 2026 | Active |
| One Day Complete Repipe Inc | B + C36, C42 | 2006 | Active |
| One Hand Construction | B | 2019 | Active |
| One-Up Builders | B | 2023 | Active |
| Onit Remodeling | B2 | 2025 | Active |
| Onpoint Construction | B | 2020 | Active |
| Opi Commercial Builders Inc | B | 2003 | Active |
| Optimal Earthwork And Grading Inc | A + C12, C21 | 2022 | Active |
| Optiwise Landscape | B2 + C27 | 2021 | Active |
| Opulent Bay Homes Inc | B | 2018 | Active |
| Oracle Construction Inc | B | 2023 | Active |
| Orange Home Builders Inc | B | 2024 | Active |
| Orozco Construction Inc | B | 2022 | Renew by Nov 30, 2026 |
| Ortiz Anduaga Construction Inc | B | 2018 | Renew by Dec 31, 2026 |
| Oscar Builders Inc | B + C6 | 2025 | Active |
| Ot Bay Builders Inc | B | 2022 | Active |
| Outermost Metal Panels | B + D24 | 2022 | Active |
| Outertainment Construction Inc | B | 2016 | Active |
| Oveisi Construction Inc | B | 2021 | Renew by Dec 31, 2026 |
| Owen Plumbing And General Contracting Inc | B + C36 | 1971 | Active |
| Ozzy Construction Inc | B + C5, C10, C36 | 2013 | Active |
| P & T General Construction Company Inc | B | 1984 | Active |
| P And L Sheetmetal | B + C20, C43 | 2002 | Active |
| P C R Builders Inc | B | 2015 | Active |
| P F B Construction Inc | B | 2020 | Active |
| P H P Construction Inc | B | 2018 | Active |
| P N C Builders Company | B | 2023 | Active |
| Pacific Coast General Construction Inc | B | 2005 | Active |
| Pacific Coast Home Services | B + C10, C20, C27 +1 | 2005 | Active |
| Pacific Custom Construction Inc | B | 2021 | Active |
| Pacific Electric Contracting Inc | A + C10 | 1977 | Renew by Dec 31, 2026 |
| Pacific Gates Construction Inc | B | 2023 | Active |
| Pacific Kitchen & Bath Co Inc | B | 2015 | Active |
| Pacific States Dirtmarket Joint Venture | A | 2019 | Active |
| Pacific Underground Construction Inc | A + C16 | 1982 | Active |
| Palermo Craig Inc | B | 1995 | Active |
| Pan Cal Corporation | B | 2017 | Active |
| Paramount Construction Group LLC | B | 2025 | Active |
| Paramount Drywall | B | 2023 | Active |
| Paramount Maintenance Inc | B | 2009 | Active |
| Parker Construction | B | 2007 | Active |
| Passion Bay Builders Inc | B | 2026 | Active |
| Peak Construction Group | B | 2023 | Active |
| Peletz C M Co | A, B | 1958 | Active |
| Penguin Fireplace Inc | B2 + D34 | 2017 | Active |
| Peninsula Crane & Rigging | A, B + C51 | 1974 | Active |
| Peninsula Home Advisors Inc | B | 2022 | Active |
| Pereira Paving Inc | A | 2010 | Active |
| Perez Don House Movers & Mobile Homes Inc | B + C21 | 1955 | Renew by Dec 31, 2026 |
| Perry G L Construction Inc | B | 1980 | Active |
| Petro Construction Inc | B | 2022 | Active |
| Pho Construction Inc | B | 2018 | Active |
| Phoenix Design And Construction | B | 2024 | Renew by Dec 31, 2026 |
| Phoenix Legend Corp | B | 2021 | Active |
| Pierre Designs Inc | B | 2025 | Active |
| Pine Property Services Inc | B | 2022 | Active |
| Pinnacle Construction And Modular Inc | B | 1990 | Active |
| Pinnacle Development Group | B | 2024 | Renew by Nov 30, 2026 |
| Piper John Company Inc | B | 1999 | Active |
| Pivot Interiors Inc | B + D34 | 1973 | Active |
| PKB Saratoga Inc | B | 2026 | Active |
| Plateau Building Group Inc | B | 2008 | Active |
| Platinum Builders Inc | B | 2007 | Active |
| Platinum One Construction Inc | B | 2021 | Active |
| Platinum Rooter & Plumbing Inc | A + C36, C42 | 2021 | Active |
| Plus Plumbing Inc A | B + C36 | 2002 | Active |
| PMG Builders Inc | A, B + C10 | 2021 | Active |
| PN Custom Home Builders | B | 2024 | Active |
| Polygon Builder Inc | B | 2023 | Active |
| Pomerlo Engineering Inc | A, B | 2023 | Active |
| Ponce Construction SJ Inc | A | 2025 | Active |
| Pony Construction Inc | B + C8 | 2016 | Active |
| Portola Design Build Inc | B | 2021 | Active |