Between £30m and £50m is expected to be spent on advisory fees over the course of the airport modernisation programme.
The client is aiming to set up a professional management framework, with several panels covering specific services.
Around seven firms are expected to be appointed.
In July, Gatwick Airport named 10 industry heavyweights for its contractor framework. These are: Balfour Beatty, Bouygues, Carillion, Costain, Mace, Morgan Sindall, Laing O’Rourke, Vinci, Volker Fitzpatrick and Willmott Dixon.
Typical works will include new aircraft piers, modernised baggage systems and new retail, security and immigration areas.
Information and documentation on the professional team requirements are available on https://www.delta-esourcing.com/delta with expressions of interest due in by 14 November.
Requests for a proposals will go out to selected firms two weeks later.