Mr Farrar has run the CITB for seven years. He will remain in post only until an interim CEO is appointed. The search for a permanent replacement has also begun already.
CITB chairman James Wates said: “Mark has led the organisation through challenging times in the industry, securing on-going levy and other funding. He leaves CITB with our thanks and wholehearted best wishes.
“The leadership organisation for the UK construction industry’s skills and training needs is now looking forward to facing new challenges in a new chapter of meeting industry’s future needs.”