| 1 Plumber 4 U Inc | PLB, NGF, GFC + LPG | 2005 | Active |
| A J Lyons Construction Inc | PLB, GFC + RBC, CBC, ELE +1 | 2003 | Active |
| A Step In Time Inc | PLB, GFC + CBC, RBC, HVA | 2011 | Active |
| A-1 American Services Inc | PLB, GFC + HVA | 2000 | Active |
| A-1 Plumbing Companies LLC | PLB, GFC | 2018 | Active |
| A-1 Plumbing The Drain Doctor Inc. | PLB, GFC | 2015 | Active |
| A/C Central Heating And Air Conditioning LLC | NGF + RBC, CBC, HVA | 2008 | Active |
| Aable Plumbing Services Of Virginia Inc | PLB, GFC + HVA | 1996 | Active |
| Abr Mechanical Services LLC | GFC + HVA | 2019 | Active |
| Accurate Air Conditioning And Heating Inc. | GFC + HVA | 1999 | Active |
| Ace Mechanical Inc. | GFC + CIC, HIC, HVA | 2008 | Active |
| Acosta Builders LLC | PLB + HVA, HIC | 2024 | Active |
| Adam Myers Plumbing Inc | PLB, GFC + HVA | 2006 | Active |
| Adrian Builders Group LLC | GFC + RBC, CBC, HVA | 2014 | Active |
| Advanced Modular Services Incorporated | PLB, GFC + CBC, RBC, ELE +1 | 2000 | Active |
| Advantage Heating And Cooling Inc | NGF, GFC + LPG, HVA | 2003 | Active |
| Affordable Plumbing And Drain LLC | PLB | 2024 | Active |
| Air Care Experts Inc | GFC + HVA | 2014 | Active |
| Alan S Plumbing Inc | PLB, GFC | 2025 | Active |
| All Day Plumbing Inc | GFC, PLB | 2016 | Active |
| Alnam Corp | PLB + AES, CBC, RBC +5 | 1991 | Active |
| American Termite & Pest Control Inc | PLB + CBC, RBC | 1992 | Active |
| Amw Plumbing LLC | PLB | 2021 | Active |
| Anchor Exteriors Inc | PLB + ELE, HIC | 2016 | Active |
| Anderson S Plumbing LLC | PLB | 2021 | Active |
| Aow Plumbing LLC | PLB | 2020 | Active |
| Applied Mechanical Rersources Inc | NGF, GFC + RBC, CBC, MCC +5 | 2002 | Active |
| Atlantic Heating & Cooling Service Inc | NGF + LPG, H/H, ENV | 2007 | Active |
| Bay Area Plumbing LLC | PLB, GFC | 1997 | Active |
| Bay Mechanical LLC | PLB + CBC, HVA | 2026 | Active |
| Bayside Heating And Air Conditioning Co Inc | GFC + HVA | 1994 | Active |
| Bayview Plumbing Services LLC | PLB | 2026 | Active |
| Bda Builders LLC | PLB, GFC + ELE, RBC, HVA | 2021 | Active |
| Beach Plumbing LLC | PLB | 2025 | Active |
| Bertolino Brothers Inc | GFC, PLB + RBC, HVA, CBC +1 | 1992 | Active |
| Best Remodelers Of Virginia Inc | PLB, GFC + PTC, CIC, HIC +1 | 2009 | Active |
| Best Value Heating And Cooling LLC | GFC + HVA | 2019 | Active |
| Betty S Plumbing & Heating Inc | PLB, GFC + HVA | 2013 | Active |
| Big Bull The Plumber Inc | PLB | 1998 | Active |
| Big Dog Plumbing & Heating LLC | PLB, NGF, GFC + LPG, RBC, CBC +1 | 2009 | Active |
| Blair S Plumbing LLC | PLB, GFC + HVA | 2007 | Active |
| Blessings Plumbing Inc | PLB, GFC | 1997 | Active |
| Built With Integrity Inc | PLB, GFC + RBC, CBC, ELE +1 | 2017 | Active |
| Butt Plumbing And Heating Incorporated | NGF, PLB + HVA | 1991 | Active |
| CCG LLC | GFC + ELE, RBC, HVA | 2025 | Active |
| Charles E Warren Inc | PLB + HVA | 2019 | Active |
| Chim Chimney LLC | GFC + HVA, HIC | 2016 | Active |
| Chris Mechanical Services Inc | PLB, GFC + ELE, HVA | 2011 | Active |
| Chuck S Mechanical Appliance Service Inc | GFC + HVA | 2003 | Active |
| Classic Air Care LLC | GFC + ELE, HVA | 2010 | Active |
| Clear Day Plumbing LLC | PLB | 2026 | Active |
| Coastal Virginia Piping Systems | PLB + HVA | 2025 | Active |
| Commercial Refrigeration Services Inc | GFC + ELE, HVA | 2018 | Active |
| Conner Services Inc | PLB, GFC + HVA | 1999 | Active |
| Coradi Contracting LLC | PLB + HIC | 2009 | Active |
| CPS Contractor Group LLC | PLB, GFC | 2018 | Active |
| Crest Foodservice Equipment Co Inc | GFC + HVA, EMC | 2007 | Active |
| Cyclone Mechanical Inc | GFC + HVA | 2005 | Active |
| CZ Mechanical | GFC + HVA | 2026 | Active |
| Dacu Mechanical LLC | GFC + HVA | 2017 | Active |
| Dailey & Sons Heating And Cooling LLC | GFC + HVA | 2021 | Active |
| Dan & Son Mechanical LLC | GFC + HVA | 2008 | Active |
| Davcon Inc | PLB, GFC + HVA | 1993 | Active |
| Davken Mechanical Inc | PLB, GFC + HVA | 2001 | Active |
| DBM Corporation | GFC, PLB | 2017 | Active |
| Divergent Construction Management Group Inc | GFC, PLB + CBC, HVA, RBC +1 | 2023 | Active |
| DLD Plumbing Contractors Inc | PLB, GFC | 1999 | Active |
| DMJ Contracting Inc | PLB + RBC, CBC, PTC +4 | 2008 | Active |
| Dr Degrees HVAC LLC | GFC + HVA | 2016 | Active |
| Ductman HVAC Services Inc | GFC + HVA | 2022 | Active |
| Eastern Plumbing Services Inc | PLB, GFC | 1998 | Active |
| Economou Enterprises Inc | PLB, GFC + RBC, CBC | 2007 | Active |
| Edge Mechanical Inc | PLB, GFC + HVA | 2003 | Active |
| Elevated Plumbing Design LLC | GFC, PLB | 2022 | Active |
| Elite Plumbing Inc | PLB | 2006 | Active |
| Eln Enterprises LLC | PLB, GFC + RBC, CBC, ELE +2 | 2008 | Active |
| Everything Plumbing LLC | PLB | 2026 | Active |
| Fluid Plumbing Repair LLC | PLB | 2026 | Active |
| Galactic Air Incorporated | GFC + HVA | 2015 | Active |
| Gas Specialty Company Inc | GFC + HVA | 2001 | Active |
| Gelardi Enterprises LLC | PLB + RBC, CBC, ELE | 2012 | Active |
| GK Plumbing Inc | PLB | 2017 | Active |
| Gravity Plumbing LLC | PLB | 2018 | Active |
| Great Deal Plumbing & Gas LLC | PLB, GFC | 2018 | Active |
| Green Run Inc | GFC + CBC, HVA | 2017 | Active |
| Guaranteed Plumbing LLC | PLB, GFC + HVA | 2012 | Active |
| Haney S All Trade Services LLC | PLB, GFC + HVA | 2018 | Active |
| Hats Off Heating & Cooling Inc. | GFC + HVA | 2017 | Active |
| Home Modernization Center Inc | PLB, GFC + CBC, RBC, ELE +1 | 1997 | Active |
| HTC LLC | GFC + HVA | 2021 | Active |
| Hutchinson Mechanical Energy Specialists Inc | GFC + HVA | 2004 | Active |
| Inlet Plumbing & Drain Inc | PLB, GFC + HVA | 2006 | Active |
| Interior Systems Of Virginia Inc. | PLB + RBC, CBC | 2015 | Active |
| Ireland Electric Company | PLB + ELE, EMC | 1999 | Active |
| J Hutson & Company | PLB, GFC + RBC, CBC, ELE | 2013 | Active |
| Jes Construction LLC | PLB + RBC, CBC, ELE | 2002 | Active |
| Jim Bertolino Plumbing And Drain Service Inc | PLB, GFC + ELE, HVA | 1998 | Active |
| JNJ Enterprises LLC | PLB + RBC | 2026 | Active |
| Joint Resources Solutions LLC | GFC + HVA | 2016 | Active |
| Joyner S Heating & Cooling Inc. | GFC + HVA | 2013 | Active |