As well his work at Wimpey, Roxburgh has been a strong advocate of planning reform, being a member of the urban taskforce's land condition record working party.
A Wimpey spokesperson stressed that the departure was amicable. She said: "He wanted to move on. We are sorry to see him go." She said that a new strategy for the merged Wimpey Homes and McLean Homes divisions would be ready by the end of February.