| Business | Phone |
| Catora Diesel 3169 River Dr, Lawrenceville 30044 | (770) 985-0855 |
| Strickland Mechanical 1390 Appian Way, Lawrenceville 30045 | (770) 318-8970 |
| T & R Mechanical Contractors 1740 Campbell Ives Dr, Lawrenceville 30045 | (770) 682-7904 |
| Spinks Mechanical 3076 Lawrenceville Hwy, Lawrenceville 30044 | (770) 381-7772 |
| Reliance Mechanical 233 Swanson Dr A, Lawrenceville 30043 | (770) 338-1794 |