Steve Briggs and Mick Regan are to become Contractors Director and Operations Director respectively.
Briggs joined the company as a contracts manager in 1995, and has worked alongside current director Nigel Wyatt to build the company's reputation in the golf market.
Regan was appointed as a construction manager in 2000 and took over responsibility for day-to-day operations following the retirement of Michael Abbott in 2005.
MJ Abbott managing director Jonathon Abbott said: "We are delighted that Steve and Mick have demonstrated their long-term commitment to the company by accepting promotion. We now have a superb management team in place to ensure the continuing success of the business."