Oates left GMI Construction just over five years ago to join specialist industrial contractor TSL Projects where he became project director.
He previously spent more than 16 years with GMI, starting as a site manager before progressing to contracts manager.
He returns to lead the north east growth strategy from a new Teesside office. He is also joined by new North East commercial manager Paul Raine, who joins from Leeds-based Torsion Group.
Lee Powell, divisional managing director, said: “Both these appointments underline our commitment to the North East and we are resolved to play a greater role in creating jobs and generating economic prosperity.
“Gary is highly experienced and committed and, as such, is the right person to lead our North East division and grow this business in a region that is already enjoying the benefits of the levelling up agenda. We’re also delighted to welcome Paul to the team, who brings with him extensive commercial knowledge.
“GMI Construction Group has a long association with the North East and has been involved in several high-profile developments, allowing it to build a strong relationship with local suppliers and sub-contractors.”
This month, GMI will start work on a £30m contract to construct 362,600 sq. ft of commercial units as part of the first phase of the Hillthorn Business Park development at Washington, near Sunderland.
Appointed lead contractor by client Legal & General, GMI is due to complete the seven units, ranging in size from 21,000 sq. ft to 83,000 sq. ft, by September 2022.
It is part of a £60m two-phased development designed to stimulate economic growth by supporting the needs of industrial, advanced manufacturing, storage, and distribution businesses in the area.