| Business | Phone |
| Barge Waggoner Sumner & Cannon 2 Perimeter Park S # 370e, Birmingham 35243 | (205) 298-6074 |
| Malcolm Pirnie Inc 2170 Highland Ave S # 250, Birmingham 35205 | (205) 930-5700 |
| Engineering Design & Testing 500 Gene Reed Rd # 115, Birmingham 35215 | (205) 838-1040 |
| Clearlinx Design 100 Corporate Pkwy, Birmingham 35242 | (205) 408-7171 |