Repairing the crumbling Houses of Parliament could be "billions more" than expected, according to an MP involved in scrutinising the plans.
A parliamentary committee recommended an estimated £4 billion to restore the Palace of Westminster, but now an MP on the committee has warned that the true cost of the work could be significantly higher.
SNP MP Neil Gray, a member of the joint committee for the Palace of Westminster, has suggested abandoning the site in favour of a purpose-built new facility.
He told The House magazine that until decisions were made about the scope of the work it would be difficult to finalise a budget but he said: "I can almost guarantee the costs are going to be higher than £4 billion."
The current plan involves moving MPs and peers of the Houses of Parliament while urgent repairs are carried out to prevent a "catastrophic event" at the historic building.
Bit Mr Gray has called for consideration to be given to leaving the Palace of Westminster permanently.
"My concern the whole way through the process on the committee was 'are we artificially crow-barring a parliament into an old palace at a premium?' I think that is borne out in the costs that we're looking at," he said.
"I think there are potential opportunities in a new-build parliament. If you go to the Scottish Parliament, it's an open bright, accessible building.
"Say what you will about the exterior - some people love it, some people hate it - but when you're in the building, it's well-functioning, easy to operate. Contrast that with the Palace and it's completely the opposite."