He will take-up a similar role at the London based specialist engineering contractor next month.
Maguire left Multiplex in June and has held previous senior roles at Laing O’Rourke.
McGee Group Managing Director, Seb Fossey, said: “I’m delighted to be welcoming Paul as he joins the board at McGee.
“His pedigree working as Commercial Director across a range of self-delivery businesses is perfectly aligned with our offering as a leading Specialist Engineering Contractor.
“Paul brings with him extensive experience both working with clients in the London commercial sector and of delivering major programmes of work in the infrastructure arena.
“When you combine this with McGee’s depth of delivery expertise it will further catalyse our ability to deliver high value outcomes that are focused on supporting the needs of our clients.”
The appointment came as McGee unveiled a strong set of results for the year ending to 30 November 2019.
Pre-tax profit remained stable at £8.3m on turnover, which increased by 9% to £109m.
The impact of Covid is set to reduce turnover this year but McGee is still predicting it will make a profit.
Group Finance Director, Paul Hickey, said: “The Board has undertaken a comprehensive review of the Group’s forecasts to November 2021 in the context of the current Covid-19 situation.
“Perhaps unsurprisingly, this review indicates that the turnover for Financial Year 2020 will reduce to between circa £80m to £85m.
“However, the Board has been proactive in managing the Group’s cost base and continues to project a pre-tax profit for financial year 2020.
“Early indications suggest that we will see a recovery in turnover into Financial Year 2021”.