| Labib Development LLC | B | 2023 | Active |
| Ladd Pro Builders | B | 2025 | Active |
| Lally Enterprises Inc | B + ASB | 2011 | Active |
| Largent & Sons Construction | B | 2026 | Active |
| Latka Engineering Inc | A, B + C10 | 1995 | Active |
| Layton Contractors Inc | A, B | 2020 | Active |
| Lee Shan Creative Build Inc | B | 2017 | Active |
| Leoline Construction Services Inc | B | 2018 | Active |
| Lido Building Company | B | 2021 | Active |
| Lim Solutions Inc | B + C20, C36, C46 | 2012 | Active |
| Linus Construction Inc | B | 1993 | Active |
| Litz Construction Inc | B | 1989 | Active |
| Lloyd Construction | B | 2026 | Active |
| Lombard Construction Services Inc | A, B + C8, C35, C39 +1 | 1995 | Active |
| Love Douglas Christopher Construction Inc | B | 2002 | Active |
| Lowe Builders | B | 1989 | Active |
| Luxury Home Services Inc | B | 2011 | Active |
| Lynco Environmental Engineering Inc | A | 2021 | Active |
| Macdonald Homes LLC | B | 2024 | Active |
| Mainland General & Electrical Contractors Inc | B + C10 | 2001 | Active |
| Majac Restoration Inc | B | 2014 | Active |
| Maki Contractor Services Inc | B | 2012 | Active |
| Mamelli Building & Painting | B + C33 | 2014 | Active |
| Mancini Construction Inc | B | 2007 | Active |
| Manfredi Scott Construction Inc | B | 1983 | Active |
| Manoscraft Build Co LLC | B + C4, C54 | 2026 | Active |
| Mason V R Inc | B + C9 | 1984 | Active |
| Mastercraft Remodel | B2 | 2025 | Active |
| MC Kay Mike Construction Inc | B | 1997 | Active |
| McCullough Framing Inc | B | 2025 | Active |
| Meppro Inc | A, B + C8, C12, C20 +2 | 2019 | Active |
| Milestone Pacific Builders Inc | B | 2019 | Active |
| Miller Construction Inc | B + ASB, C21 | 1977 | Active |
| Miller Development Group LLC | B | 2019 | Active |
| Mission Maintenance And Construction LLC | B | 2018 | Active |
| Modro & Company Builders Inc | B | 2023 | Active |
| Modro & Company Builders Of Ca Inc | B | 2025 | Active |
| Monarch Construction Services | B | 2023 | Active |
| Moser West Builders | B | 2025 | Active |
| Moss Company The | A, B + C8 | 1994 | Active |
| MTH Real Estate Design And Construction Inc | B | 2026 | Active |
| MTH Rehab And Construction | B | 2023 | Active |
| Murphy R J Construction Inc | B | 2000 | Active |
| Mustang Construction Corp | B | 2018 | Active |
| N J O Construction Services Inc | B | 2023 | Active |
| Nationwide General Construction Services | A, B + C12, C20, C21 +1 | 2017 | Active |
| New Pacific Construction One Inc | B | 2026 | Active |
| Newcastle Construction Inc | B | 2019 | Active |
| Newport Coast Elite Contractors | B | 2016 | Active |
| Next Construction Inc | B | 2019 | Active |
| North Shore Pile And Lifting Services Inc | A | 2025 | Active |
| Northington Design Build LLC | B | 2024 | Active |
| NXT Gen Construction Inc | B | 2025 | Active |
| O C Builders Inc | B + C54 | 2013 | Active |
| O C Home Builders Inc | B | 2018 | Active |
| Oc Design & Build Inc | B | 2019 | Active |
| Oc Renovations LLC | B | 2026 | Active |
| Oc Window Experts | B + C17 | 2023 | Active |
| Oceanview Construction Inc | B | 2019 | Active |
| Omnisense HVAC | B + C20 | 2025 | Active |
| Orange County Structures Inc | B + C8 | 1997 | Active |
| Orth Construction Co | B | 1966 | Active |
| Ott Montez Construction LLC | B | 2026 | Active |
| P B P S Inc | B + C10, C53 | 1997 | Active |
| P G & Sons Inc | B | 1996 | Active |
| Pace Development Cabinetry Inc | B + C6 | 1983 | Active |
| Pacific Carpets LLC | B + C15, C54 | 2021 | Active |
| Pacific Cities Construction Inc | B | 2021 | Active |
| Pacific Coast Craftsmen Construction | B | 2025 | Active |
| Pacific Home Improvement Inc | B | 2017 | Active |
| Pacific Paradise Pools | B + C53 | 1987 | Active |
| Pacific Power Electric | B + C10 | 2019 | Active |
| Pacific Southern Building Group LLC | B | 2026 | Active |
| Pacific Utility Inc | B + C10 | 2007 | Active |
| Paetz Richard Construction A California Corporation | B | 1996 | Active |
| Parker James B Construction Inc | B | 1989 | Active |
| Partner Construction Inc | B | 2022 | Active |
| Paulino Frank Construction Inc | B | 2019 | Active |
| Pink Panther Construction Inc | B | 2025 | Active |
| Pious Construction | B | 2025 | Active |
| Portermatt Electric Inc | B + C10 | 2000 | Active |
| PPR Enterprises Inc | B + C6 | 1999 | Active |
| Premier Builders And Repair LLC | B | 2021 | Active |
| Prysm Builders Inc | B | 2022 | Active |
| Pyramid Development & Maintenance Inc | B + C15 | 1998 | Active |
| Q3 Builders Inc | B + C10, C36 | 2017 | Active |
| Quality Construction & Consulting Inc | B | 1991 | Active |
| R & J Investments Inc | B | 2009 | Active |
| R B E Construction Group Inc | B + C10 | 1990 | Active |
| R F P Inc | B + C10, C16 | 2008 | Active |
| R Farris General Contracting Inc | B | 2024 | Active |
| R O M Construction Inc | B | 2008 | Active |
| R P B | B | 2017 | Active |
| Rain Gutter Store The | B + C43 | 1996 | Active |
| Ran Enterprises Inc | B + C20 | 2003 | Active |
| Rancho Pacific Homes Inc | B | 2007 | Active |
| Razi Construction & Development Company | A, B | 1993 | Active |
| Readymade Co LLC | B | 2024 | Active |
| Red Construction | B | 2019 | Active |
| Redline Electric | B2 + C10 | 2016 | Active |