Castle joined the company in 2004 to set up its early fixed price contracting business Mace Plus and was appointed to the group board in 2013.
He will now become a Non-Executive Director to the Group Executive Board.
Jackson will take over the Chief Operating Officer for Construction role from April reporting to Gareth Lewis, Mace’s CEO for Construction.
Jackson is currently Managing Director for Mace’s International Technology business, delivering major projects in Europe.
He joined Mace in 2015 as business unit director for the residential sector.
Mark Reynolds, Mace’s Group Chief Executive, said: “I would like to thank Mark for the exceptional contribution to the Group over the last seventeen years.
“During this time our construction business has grown to a £1.7 billion business; delivering some of the most iconic projects in the world – and Mark has played a key role in making that happen.
“As we look towards our ambitious plans for the future – and our drive to become a more purpose-led business – our new COO for Construction, Andrew Jackson will support Gareth Lewis to take forward the construction business and continue to transform and improve delivery for our clients”.
Castle said: “Since joining Mace in 2004, it’s been a privilege to watch the construction business grow to one of the leading constructors in the UK – I have thoroughly enjoyed working with our talented teams to deliver many exciting projects; from the Tate Modern extension, New Tottenham Hotspur stadium to Chelsea Barracks and the Emirates Air Line cable car.
“I am immensely proud of our achievements and confident that the future holds fantastic opportunities for the business. I look forward to continuing to work closely and support the Board in my new role as a Non-Executive Director.”