The construction contracts to build HS2’s Birmingham stations will be awarded nearly two years later than those at the London end of the route, Construction News can reveal.

HS2 confirmed the awarding of the contracts for the northern stations, Birmingham Interchange and Birmingham Curzon Street, had been scheduled for Q2 2020, two years after the awarding of the southern station deals at Old Oak Common and Euston, which is set for Q2 2018.

The client also confirmed that procurement for the southern stations’ construction is scheduled to begin this summer, while the northern stations procurement is set to be launched in the autumn of 2018.

HS2 said the decision behind the staggered approach to procurement was due to the difference in complexity of the northern and southern stations.

Construction work on all four stations is expected to be completed by 2026.

HS2 is also currently consulting prospective suppliers over the contract type it will use to deliver the northern and southern stations.

The smaller Birmingham stations are most likely to be procured under a conventional design-and-build contract, with the contractors or consortiums receiving a lump sum to manage and deliver each project.

For the Euston and Old Oak Common stations, HS2 is considering a “construction partner” approach where the client will partner up with a construction firm to oversee the delivery of the scheme.

It is understood that, unlike the Birmingham station contracts, HS2 would have a lot more oversight of the delivery and awarding of subcontracts throughout the London stations build programme.

The client said the plans reflected the nature of each project, with the northern stations much more straightforward brownfield sites to work on, offering easier access and fewer interfaces with existing infrastructure.

HS2 said these approaches had not yet been finalised and it was still in discussion with the supply chain.

Earlier this month, HS2 launched the bidding for the multi-million-pound contracts covering the design of the four stations.

The procurement included four packages for the design totalling £220m.

The design contract for the Birmingham Interchange is expected to be worth £23m, while Birmingham Curzon is valued at £30m.

The contracts for the London stations will account for three-quarters of the £220m figure, with Euston valued at £98m and Old Oak Common £70m.

HS2 is also undertaking a separate procurement to select a master development partner for Euston.

Last week HS2 published an updated version of its timetable for construction contracts on the £55.7bn project.

Included in the list was the commercial management services framework, the procurement for which will be rerun, it emerged earlier this month, after HS2 found conflict with the bidders.

The client said that it was reassessing the scope of the contract and that the first packages on the framework would now be allocated through Highways England’s Specialist Professional and Technical Services Framework.

The firms considered under the revised commercial services framework deal include Arcadis, Mott MacDonald and Turner & Townsend, all of which had been shortlisted for HS2’s initial commercial management services framework.

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