The company's custom-build plant and 3D design arm, both in London, and its modular and portable display business in Salisbury will be relocated to premises close to Heathrow, west London next month.
SG director Paul Green will head the new division, called Service Exhibitions.
SG director Ben Moss said: "The move is about better internal communication and bringing our exhibition skills base into one site to create a more effective business. The market is having a tough time and you have to come up with different ideas to get market share. We are budgeting for a 10% increase on last year's numbers."