| Garcia Freddy Plumbing Inc | C36 | 2023 | Active |
| Garcia Plumbing And Mechanical Company Inc | C36 | 2000 | Active |
| Gech Inc | C36 + A, B, C10 | 2006 | Active |
| Genteel Plumbers Inc The | C36 + B | 2017 | Active |
| Gilmore E B & Sons Mechanical Services Inc | C36 + C2, C4, C10 +3 | 1997 | Active |
| Gonzalez Painting LLC | C36 + B, C33 | 2010 | Active |
| Gorsneg Construction | C36 + A, B, C10 +1 | 2022 | Active |
| H & L Construction Inc | C36 + B, C16 | 2016 | Active |
| Handyman Heroes Inc | C36 + B | 2015 | Active |
| Hard Core Plumbing Contractor Inc | C36 | 1996 | Active |
| Heaven's Earth Co Inc | C36 + A, B, C10 +2 | 2001 | Active |
| Heidis House Construction | C36 + B | 2018 | Active |
| Heises Plumbing | C36 + A, C10, C20 | 2022 | Active |
| Hetherington Mechanical & Plumbing | C36 + B, C4, C10 +1 | 1993 | Active |
| Highq Inc | C36 + B | 2023 | Active |
| Holland Plumbing Works | C36 | 2003 | Active |
| Hollon Plumbing Inc | C36 | 2018 | Active |
| Hong Wei Construction Inc | C36 + B, C10, C16 | 2010 | Active |
| Hyan Construction Company | C36 + B, C10 | 2006 | Active |
| Hydro Flow Systems Inc | C36 | 2015 | Active |
| Hydro Plumbing & Rooter Inc | C36 | 2008 | Active |
| Ibr Construction Inc | C36 + A, B, C10 | 2022 | Active |
| Infinity Plumbing & Rooter Inc | C36 | 2018 | Active |
| Integrity First Plumbing Inc | C36 | 2015 | Active |
| J & J Professional Plumbing Inc | C36 + B, C16 | 2025 | Active |
| J & K Pro Plumbing Inc | C36 + C16 | 2024 | Active |
| J M Pacific Bay Plumbing Inc | C36 | 2014 | Active |
| Ja Plumbing Inc | C36 | 2004 | Active |
| Jimenez Construction S F Inc | C36 + B, C10 | 2003 | Active |
| Jin's Plumbing Inc | C36 | 2006 | Active |
| JLH Plumbing Co Inc | C36 | 2025 | Active |
| K & D General Construction Inc | C36 + B, C10 | 1991 | Active |
| Kearney Plumbing Inc | C36 | 2016 | Active |
| Kim Yon W And Associates Design & Construction Company | C36 + A, B, C10 | 2005 | Active |
| Kirkwood Commercial Plumbing Corporation | C36 | 2021 | Active |
| Kwan Chok Kee Inc | C36 + B, C10, C16 | 2022 | Active |
| KX Construction LLC | C36 + B, C10, C20 +1 | 2026 | Active |
| Kyj Construction Inc | C36 + B, C10, C16 | 2026 | Active |
| L & Y Plumbing | C36 | 2012 | Active |
| L C Builders Inc | C36 + B | 2012 | Renew by Nov 30, 2026 |
| Larratt Bros Plumbing Inc | C36 | 1990 | Active |
| Lee Incorporated | C36 + A, ASB, B +3 | 1996 | Active |
| Lee Shelley And Associates Design & Construction Company | C36 + A, B, C10 | 2005 | Active |
| Lee Stacey And Associates Design And Construction Company | C36 + A, B, C10 | 2005 | Active |
| Lego Plumbing | C36 | 2025 | Active |
| Leong D & S Associates Inc | C36 + B, C4, C16 | 1991 | Active |
| Loughran Construction Inc | C36 + B, C4 | 1996 | Active |
| Lutz Plumbing Inc | C36 + C16, C20 | 1987 | Active |
| M E C Construction Division | C36 + B | 2006 | Active |
| M V Construction | C36 + B, C10 | 1990 | Active |
| Mac Tec Construction Company Inc | C36 + A, B, C10 +3 | 2014 | Renew by Dec 31, 2026 |
| Madden Plumbing LLC | C36 + C16 | 2003 | Active |
| Magic Plumbing Heating & Cooling | C36 + C20 | 1994 | Active |
| Malcolm Plumbing & Mechanical | C36 + C4 | 2006 | Active |
| Marco Polo Plumbing Inc | C36 | 2017 | Active |
| MC Construction Services | C36 + B, C10 | 2026 | Active |
| Mech 23 Inc | C36 + B, C20 | 2019 | Active |
| Method Design - Build LLC | C36 + B, C10 | 2024 | Active |
| Mirkovich R & Sons Inc | C36 | 1990 | Active |
| Mitchell Engineering | C36 + A, B, C10 +2 | 1998 | Active |
| Modern Technology Resources Inc | C36 + A, B, C27 +2 | 2011 | Active |
| Modern Vision Construction Inc | C36 + B, C16 | 2025 | Active |
| Moonraker Plumbing Corporation | C36 | 2026 | Active |
| MW Success Construction Inc | C36 + B, C10 | 2026 | Active |
| N T K Construction Inc | C36 + A, B, C31 +1 | 2004 | Renew by Dec 31, 2026 |
| Nature House Plumbing & Electrical Inc | C36 + C10 | 2022 | Renew by Nov 30, 2026 |
| Neng Construction Inc | C36 + B | 2018 | Active |
| Neng Plumbing Inc | C36 + B | 2022 | Active |
| North South Plumbing Inc | C36 | 2007 | Active |
| North Star Plumbing & Fire Protection Inc | C36 + C16 | 2017 | Active |
| O'Brien Mechanical Inc II | C36 + C4 | 1998 | Active |
| O'Donovan Plumbing Inc | C36 + C16 | 1989 | Active |
| O'Keeffe Mechanical Co Inc | C36 + B, C4, C10 +4 | 1994 | Active |
| Oceanside Sheetmetal Inc | C36 + B, C20, C43 | 2011 | Active |
| One Source Plumbing & Rooter Inc | C36 | 2013 | Active |
| Oran Plumbing Corp | C36 | 1999 | Active |
| Orebend Bldrs Inc | C36 + B, C4, C60 | 2016 | Active |
| Ovisco Inc | C36 + B | 1986 | Active |
| P F Construction Co | C36 + B | 1989 | Active |
| Pacific Plumbing Solution Inc | C36 | 2017 | Active |
| Pagco Construction Inc | C36 + C10, C16 | 1995 | Active |
| Parkson Construction Company | C36 + A, B | 2018 | Active |
| Phe Plumbing Inc | C36 | 2025 | Active |
| Ping's Plumbing Inc | C36 | 2017 | Active |
| Pinnacle Plumbing Inc | C36 | 2024 | Active |
| Pipeworks Inc | C36 | 2009 | Active |
| Plumbing Construction | C36 | 2022 | Active |
| Plumbing Pros Consulting LLC | C36 | 2024 | Active |
| Prague Property Management Inc | C36 + B, C10 | 2014 | Active |
| Precise Plumbing And Drain Inc | C36 | 2023 | Active |
| Precision Flow Plumbing Inc | C36 | 2026 | Active |
| Pro Plumbing & Fire Sprinkler Inc | C36 + C16 | 2015 | Active |
| R & A Golden City Plumbing Inc | C36 | 2024 | Active |
| R & D Construction Co Inc | C36 + B | 2003 | Active |
| R & M Plumbing Co | C36 | 2016 | Active |
| Rafael Plumbing Plus Inc | C36 | 2023 | Active |
| Rapid Flow Plumbing & Rooter Inc | C36 + B | 2024 | Active |
| Recinos Plumbing A Partnership | C36 | 2024 | Active |
| Red Wrench Plumbing Inc | C36 | 2011 | Active |
| Reichel C R Engineering Co Inc | C36 + C4, C10, C16 +3 | 1957 | Active |