Throughout Central Pennsylvania, MML Construction has sub-contracted their erection services to established construction firms. Companies utilizing our services include:
| ASP Services | Shamokin Dam |
| Boyle Assoc. | Lehigh Valley |
| Consolidated Construction | Lancaster |
| Cresswell Brothers | Pottsville |
| Dolan Construction | Reading |
| Hayes Construction | Reading |
| High Construction | Lancaster |
| Hollenbach Construction | Boyertown |
| Horst Construction | Lancaster |
| Lancaster Metal Sales | Lancaster |
| Lebanon Building Systems | Lebanon |
| Mericle Construction | Wilkes Barre |
| Mid-State, Inc. | Harrisburg |
| Nauman Construction | Lancaster |
| Utilicon | Pheonixville |