Dean and Dyball is a leading UK business working in southern England and Wales and a top 20 UK civil engineering contractor according to NCE's 2007 Contractors File.
Turnover to year end 30 September 2007 was £262M which produced a pretax profit of £4.5M. Predictions for 2008 were that the firm would hit the £300M turnover mark. The firm employs 1300 people.
"The acquisition is the latest stage in our strategy of building leading positions in regional UK civil engineering and building markets following the successful acquisition and integration of Mansell, Birse and Cowlin," said Balfour Beatty chief executive Ian Tyler.
"This transaction established a strong civil engineering base in an area where we currently have only a limited presence and adds further capability in the building sector."
The civil engineering company will operate under the Dean and Dyball name post acquisition. The civils arm has a strong record in coastal and marine works and framework agreements with the Environment Agency, Thames Water and the RNLI.
Dean and Dyball's building division will be merged with Mansell. Its busy rail company, which has been working with Network Rail to produce a new, modular rail station among recent projects will continue to trade as Dean and Dyball Rail.
The acquisition is Balfour Beatty's largest civils purchase in the UK since it bought Birse for £32M in 2006. It bought social housing contractor Cowlin for £52M in August last year.
Dean and Dyball was founded by Adrian Dyball's father Peter and John Dean in 1969.