Doha has extended the tender closing dates for contracts to build two of its planned football stadiums for Fifa’s 2022 football World Cup.

Firms are preparing to submit bids on 5 November for the Al-Wakrah stadium. The previous closing date was 26 October.

Contractors submitted technical proposals and unit rates in September.

The groups that have been invited to bid include:

The stadium will have the capacity to seat 45,000 people during the tournament. The original plans involved the top tiers of the structure being modular and, following the tournament, the capacity of the stadium being reduced to 20,000, with 25,000 seats removed. The plan is for these seats to be donated and reconstructed in developing countries.

Meanwhile, contractors are preparing to submit bids on 25 November for the Al-Bayt stadium in Al-Khor. The original closing date was 29 October.

The project is divided into three main construction packages. The largest involves the construction of a 60,000-seat stadium for the 2022 World Cup. The others include the construction of a retail precinct and a utilities centre. Completion is expected in 2018.

The stadium will be modular and once the World Cup is over, the upper tiers will be removed, leaving a capacity of 32,000. The design of the stadium (and its name) comes from Bayt al-Shaar, which is a black and white tent traditionally used by Qataris.

In May, the Supreme Committee for Delivery & Legacy awarded the local HBK Contracting Company the enabling works contract for the project. The enabling works phase, which began in May, is scheduled to conclude around March 2015. The deal entails bulk earthworks including site clearance, excavation and disposal, and fill, as well as underground services and stadium foundations.

In May 2013, the US’ Aecom was appointed design consultant and the local office of Kuwait-based KEO Consultants as project manager for the Al-Wakrah stadium project.

In early April, Qatar awarded the first World Cup stadium construction contract to a joint venture of Belgium’s Six Construct and the local Midmac Contracting Company.

The estimated $300m deal involves upgrading the existing Khalifa stadium and increasing its seating capacity to 60,000, from the current 45,000. The 24-month contract will also include the renovation of the museum at the surrounding Khalifa Sports City. The consultant is Lebanon’s Dar al-Handasah. The client is Aspire Academy for Sports Excellence.

US-based CH2M Hill is the programme manager for the stadiums.