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Zaha Hadid鈥檚 Olympic aquatics centre is facing a third set of design cutbacks, it has emerged.

Project insiders say the distinctive wave-form roof designed by Hadid could now be built using timber instead of steel to drive costs down.

Talks over the change have come after the design of the roof was twice put through a value engineering process amid concerns about the construction programme鈥檚 budget.

The pool itself is likely to be built out of stainless steel, understood to be a first for an Olympic pool. As a result, the client and the sole remaining bidder, Balfour Beatty, are looking to minimise the use of steel elsewhere in the structure. This is understood to be a key reason why Eiffel, a steel contractor, dropped out of the running for the project. It is also thought to have contributed to Hochtief鈥檚 decision to pull out.

Balfour Beatty is now working with partners to value engineer the project to an acceptable cost.

John Armitt, the chairman of the Olympic Delivery Authority, told the London Assembly last week that it was too early to give a final budget for the aquatics centre, but said the cost of building the Olympic stadium was now 拢496m, compared with 拢216m in the original bid.

A project source said: 鈥淐hanging the material from steel to timber has been discussed. The roof has been changed twice already and now this is being looked at a third time. It is really frustrating for everyone involved.鈥�

Hadid scaled back the design in November 2006, cutting the size of the roof by almost a third.

An ODA spokesperson said: 鈥淎 position has not been taken on what materials will be used for the construction of the aquatics centre. It is a decision that will be made with the contractor when the bidding is finalised.鈥�