| P M K Professional Inc | B + C7, C10 | 2011 | Active |
| Pacific Coast Engineering Contractors LLC | A | 2020 | Active |
| Pacific Coast Land & Construction Inc | B | 1997 | Active |
| Pacific Custom Homes LLC | B | 2023 | Active |
| Pacific Enterprise Solutions Group | A, B + HAZ | 2025 | Active |
| Pacific West F.P Co Inc | B | 1992 | Active |
| Page T M Construction Inc | B | 1994 | Active |
| Palm Communities | B | 1982 | Active |
| Papaya Construction Group | B + C27 | 2025 | Active |
| Paragonsun | B + C10, C46 | 2017 | Active |
| Parshall Construction Plus | B | 2023 | Active |
| Patios By B & B Inc | B | 1977 | Active |
| Patriot Restoration Inc | B | 2020 | Active |
| PCH Restoration Team | B | 2009 | Renew by Nov 30, 2026 |
| Pelican Adu Builders | B | 2023 | Active |
| Perfect 20 Construction LLC | B | 2024 | Renew by Dec 31, 2026 |
| Peterson-Chase General Engineering Construction Inc | A + C13, C32 | 1991 | Active |
| Pioneer Construction Inc | B | 2023 | Active |
| Precision Community Construction | B + C36 | 2011 | Active |
| Pridemark Contractors Inc | B | 1978 | Active |
| Prime Properties Construction | B + D52 | 2018 | Active |
| Primior Inc | B | 2014 | Active |
| Priority Home Specialists | B | 2025 | Active |
| Prisco Services Inc | B + C36 | 2024 | Renew by Dec 31, 2026 |
| Prismatic Construction | A, B | 2025 | Active |
| Pro A Line Construction | B | 2025 | Active |
| Project Delivery Group West | B | 2015 | Active |
| Projekta Inc | B | 2016 | Active |
| Protek Integration Inc | B + C7, C10, D16 | 2009 | Renew by Dec 31, 2026 |
| Puretech Construction Inc | B | 2026 | Active |
| PV Guru Inc | B + C10, C46 | 2013 | Active |
| Quacom Electric LLC | B + C10 | 2023 | Active |
| Quality Development & Construction Inc | B | 2015 | Active |
| Quinn Enterprises Inc | B | 1996 | Active |
| R & L Group Inc | B | 2011 | Active |
| R 3 Construction Services Inc | B | 2007 | Active |
| R C I Roman Construction Inc | B + C33 | 2017 | Active |
| R D Olson Construction Inc | B | 2010 | Active |
| R G Construction Pros | B + C10 | 2016 | Active |
| Rad Estate Management Inc | B | 2024 | Active |
| Rainbow International Of Orange County | B + C15 | 2017 | Active |
| Ramboll US Consulting Inc | A | 1995 | Active |
| Rana Development | B | 2025 | Active |
| Rayane | A, B | 1993 | Active |
| Reagent World Inc | B + C20 | 2018 | Renew by Dec 31, 2026 |
| Redhawk Builders Inc | B | 1994 | Active |
| Redwood Construction Inc | B | 2001 | Active |
| Reindeer Homes | B + C10 | 2021 | Active |
| Reliance Contracting Inc | B | 2023 | Active |
| Remodel Right Inc | B | 2023 | Active |
| Remomax Inc | B | 2018 | Active |
| Renault And Moran Construction LLC | B | 2018 | Active |
| Restoration 1 Of Irvine | B | 2024 | Active |
| Restotech Dki | B + C15 | 2006 | Active |
| Revel Solar Energy | B + C10 | 2023 | Active |
| Revive HQ Inc | B | 2023 | Active |
| Righteous Remodeling | B2 | 2026 | Active |
| Riot Renovation | B2 | 2025 | Active |
| Risewell Homes | B | 2009 | Active |
| Riverlake Development Inc | B | 2022 | Active |
| Roberts T E Inc | A + C34 | 1990 | Active |
| Rocha A A Construction Inc | B | 2021 | Active |
| Rodewe Construction Inc | B | 2025 | Active |
| Roseen Builders Inc | B + C21 | 2002 | Active |
| Rover USA LLC | A | 2026 | Active |
| Royalty Renovation Inc | B + C15, C33, C54 | 2025 | Active |
| Rubix Engineering | A, B | 2024 | Active |
| S&B Construction Management Services Inc | B | 2009 | Active |
| Sadra Construction | B | 2024 | Active |
| Sage Interior Inc | B + C6 | 2006 | Active |
| Salt And Light Development Inc | B | 2020 | Active |
| Sauers Lopez Construction Inc | B | 1997 | Active |
| Savoy Ritz Group Inc | B | 2015 | Active |
| SC Development | B | 1995 | Active |
| Scci Electric | A, B + C10 | 2016 | Active |
| Scott Murray Construction Inc | B | 1999 | Active |
| Sea Pointe Construction And Development Inc | B | 1993 | Active |
| Serafina Inc | B | 2025 | Active |
| Seremgo Remodeling LLC | B | 2025 | Active |
| Servco Inc | B | 2009 | Active |
| Service One Construction Inc | B + C20 | 2010 | Active |
| Servpro Of Irvine | B | 2025 | Active |
| Shimmick / Cec Joint Venture | A, B + C10, HAZ | 2016 | Active |
| Shimmick / Disney JV | A, B + C10, HAZ | 2017 | Active |
| Shimmick Construction Company Inc | A, B + C10, C33, C36 | 1990 | Active |
| Shimmick/Danny's Joint Venture | A, B + C10, C13, C51 | 2015 | Active |
| Shimmick/Fcc/Impregilo JV | A, B + C10, HAZ | 2012 | Active |
| Shimmick/Stacy And Witbeck, A Joint Venture | A, B + C10, C33, C36 +1 | 2025 | Active |
| Shoffeitt Pipeline Inc | A + C34 | 2014 | Active |
| Shur - Dry | B + C15 | 2010 | Active |
| Silver Lining Interiors Group Inc | B + C35 | 2007 | Active |
| Simpson David Construction Co Inc | B | 1979 | Active |
| Sissom Door Company Inc | B + D28 | 1985 | Active |
| SK Ecoplant Americas Corporation | B | 2010 | Active |
| SL Carson Builders LLC | B | 2018 | Active |
| SM Construction Co Inc | B | 2007 | Active |
| Snyder Langston LLC | A, B | 2016 | Active |
| Snyder Langston Residential LLC | B | 2016 | Renew by Dec 31, 2026 |
| So Cal Builders Services | B | 1998 | Active |
| So Cal Casitas & Adus Inc | B | 2020 | Active |