Corby Cube needs extra £500,000 to be completed

The building has had many problems since it was built in 2010

An estimated £500,000 will be needed to complete Northamptonshire's Corby Cube, council officers have said.

The civic building, which houses a theatre, register office and library, was built 2010 and has so far run over its £35m budget by about £12m.

Corby borough councillors will be asked to release funds to cover the costs of the work at a meeting on Tuesday.

Norman Stronach, acting chief executive of the council, said it was "disappointing".

The figure does not include work to complete the building's fourth floor.

'Final one'

The report to councillors, which was made by a team that included Mr Stronach, reads: "It is very disappointing that this request for additional funding toward the Cube is having to be made.

"However, in order to complete the building in its current form it is necessary to increase the budget.

"Officers are keeping these costs as low as possible and it is hoped, but not guaranteed, that this request is the final one in this respect."

It is the latest in a string of problems at the Cube.

In May there were problems with the water mains at the building, which led to tap water having a "yellow tinge" for four days.

A report found the Cube was built with "dangerous" design flaws including a staircase described as "like a helter skelter", which had to be corrected.

The MP for Corby requested a confidential report into the overspend on the building be made public.

Conservative Louise Mensch said: "If there has been failings on this project then the people of Corby have a right to know."