| Business | Phone |
| Hess Mechanical Corp 9600 Fallard Ct, Upper Marlboro 20772 | (301) 856-4700 |
| J & L Mavilia Inc 11209 Brown Rd, Upper Marlboro 20774 | (301) 952-1938 |
| Plumbing Services Unlimited 6254 Fallard Dr, Upper Marlboro 20772 | (301) 599-5515 |
| Duffy Mechanical Corp 15875 Commerce Ct, Upper Marlboro 20774 | (301) 390-2300 |
| G W Mechanical Contractors Inc 6249 Crain Hwy, Upper Marlboro 20772 | (301) 952-8126 |