Houston based Leading Engineering and Fabrication Company for the Energy Industry | T-REX Engineering + Construction SITE_GLOBAL_SITEPRIMARYKEYWORDS }} T-REX Engineering + Construction, headquartered in Houston, TX, is becoming known as one of the leading EPC, engineering and fabrication companies for the energy industry. T-REX sets itself apart in its ability to provide engineering, fabrication or complete EPC services--depending on the scope of the project.