The firm has secured an extension of its framework with the Environment Agency to manage part of its flood defence, waterways and water resources capital works programme in England and Wales.
Galliford Try is one of six core contractors on the framework and expects to win £30m worth of work during the extension which will run until March 2013..
Three schemes are currently on site at Wakefield, Wigan and Banbury.
Galliford also confirmed its appointment to two highway maintenance contracts worth in excess of £20m over a four year term.
The first job is for three framework lots of re-surfacing, traffic management and carriageway markings work for existing client, East Riding of Yorkshire Council.
The second contract is for new client, Stoke-on-Trent City Council, and covers highway maintenance minor works to carriageways, footways and structures.
Galliford has also been confirmed as one of the contractors on a new framework for leading London-based housing association A2 Dominion.
The deal, which will deliver new affordable housing totalling over £300m for the association, will run for four years.
Galliford is one of 14 contractors for projects in the £5-10m bracket and one of nine contractors for projects worth £10m and upwards.