The work is part of Gatwick's transformation programme, with projects totalling up to £750m.
The airport has published contract notices for two of the four construction frameworks it is putting together.
One will involve more straightforward operational projects, involving contracts of up to £1.5m.
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The second will include 'minor works' projects for contracts between £1m and £10m.
Three lots will be awarded within each framework; building, civil engineering and mechanical/electrical work.
The two frameworks are expected to be in place by the end of the first quarter of 2016.
Details of the two other major works projects will be available later this year.
Lee Hewitt, Capital Procurement at Gatwick Airport said: "We intend to appoint a framework of competent, cost effective civil engineering, building and mechanical/electrical contractors, including smaller and local firms, to support Gatwick's Capital Investment Programme.
"The major works will help Gatwick to deliver on the next phase of our transformation which has already seen over £1 billion invested since Gatwick entered private ownership in 2009."
(LM)
