Current DG Robson owner Danny Robson and his fellow executive directors Clive Carr, Richard Exell and Andy Sofroniou will remain with the business for a minimum of three years following the acquisition.

T Clarke will also pay out a £775,000 cash bonus to the owners if earnings targets are met during the next two years.

DG Robson is a specialist mechanical services and public health contractor based in Brentwood which employs 80 staff and operatives.

For the year ended 31 March 2010, the firm reported revenues of £7.7m and a pre-tax profit of £1.3m.

T Clarke has worked with DG Robson on a number of schemes including the Westfield London retail development and the refurbishment of the media and broadcasting centre for Associated Press.

The acquisition will enable T Clarke to address its clients changing needs and position the group for new opportunities requiring a “complete M&E solution.”

DG Robson’s recent and current projects include Stansted Airport Extension,Associated Press, Kelmscott School, North Middlesex Hospital,Royal London Hospital and the Rolls Building.

The firm is also carrying-out the multi service pipe work installation for the Shard development at London Bridge.

Mark Lawrence, Chief Executive of T.Clarke said: “We believe that with DG Robson being part of the Group there is an excellent opportunity to improve our service offering and to build upon the scale and number of projects that DG Robson undertakes.”

Danny Robson, Managing Director of DG Robson said: “We are excited to become part of the T.Clarke Group, a company I have long admired with its history, its reputation and credibility in the industry.

“By joining the Group we will now be able to offer an ever broader range of services to our existing customers and to those of T.Clarke.”