A second senior official has resigned from the controversial National Children’s Hospital project this week, five years into the job.

The project director for the new National Children’s Hospital, engineer John Pollock, said he felt that it was an “opportune point” for him to move on, with his resignation set to see him step down in June.

Pollock is the second senior figure to leave the development project in the past few months, following on from the resignation of the former chairperson of the board of the National Children’s Hospital, Tom Costello, who departed his post last month.

In a statement on his resignation, Pollock said he is “very proud” of what has been achieved in the development of the hospital so far. He said: “All these milestones achieved over the past five years have been hugely satisfying, and I am very proud of what has been achieved.

“The vision to build a new children’s hospital in Ireland has been planned for decades, but has become a reality since the current Board’s appointment in 2013.

“The construction of the new children’s hospital will be completed in 2022 and will open its doors to staff, patients and children in 2023.”

The construction of the National Children’s Hospital has come under intense fire for the overspend on the project, which may go on to exceed more than €1.4bn, making it one of the most expensive buildings in the world upon completion.

The Government originally approved a figure of €983m for the development in 2017. A Government-commissioned report into the overspend is due to be released next week.