Homer joins from Morgan Sindall where he has been managing director of construction in the southern region since 2004.
Homer has also held executive positions at BAM Construct UK and Galliford Try.
His appointment follows the recent announcement that the company’s chairman and chief executive Robert Moyle is stepping down from his role as chief executive to become executive chairman.
Moyle said: “I am extremely pleased that John has joined the group.
“He has a wealth of experience in the construction industry and will embrace our culture. He will play an important role in the future growth and development of the group.”
Homer added: “I am delighted to be joining a company that has people at its heart and exceptional customer service embedded in its culture.”