Dubai Aviation Engineering Projects (DAEP) has set a new tender closing date of 31 May for the contract to establish infrastructure that will be used during the construction of the Al-Maktoum International airport expansion.

The previous deadline was 17 May.

The works involve building site offices, roadways, drainage and sewage lines, and other utilities that will be used by contractors working on the estimated $33bn expansion project.

The contract is the second construction deal to be tendered for the expansion. DAEP received bids from contractors for an enabling works package in March. It is also evaluating proposals from consultants for the design of the terminal building and other landside facilities.

The expansion means Al-Maktoum International, Dubai’s second airport, will become the world’s largest airport by 2025, with a capacity to handle 130 million passengers annually. Subsequent phases of the project are expected to bring total capacity to more than 220 million passengers by 2050.

The planned construction work includes the new terminal building, six nodes or concourses connected to the terminal by people-movers, and new runways.

An expansion to the existing terminal at the airport is also under way. In March, DAEP awarded the local Alec the contract to expand the passenger terminal building at Al-Maktoum International airport. The contract involves expanding the airport’s built-up area from the existing 66,107 square metres to 145,926 sq m by June 2017.

The local Al-Naboodah Contracting was awarded an estimated AED275m ($75m) contract to complete the external works for the passenger terminal building expansion project.