The contract to provide highways and transportation professional services is worth around£3.5 million a year and is extendible for a further three years. The in-house team, Environment Consultancy Division, saw off both Mott MacDonald and WS Atkins.
Consultant PricewaterhouseCoopers oversaw the selection process and said the council had ensured that all the bidders had full and detailed information before choosing the 120-strong ECD team.
In the light of Mott MacDonald's submission, Surrey has agreed to explore joint working in the area of highways and materials testing.
ECD head Trevor Urwin said: 'We are very proud of our in-house team. Their professionalism and our use of best practices from both the public and the private sectors led to our success.'