The restoration of Big Ben was estimated to last four years (2017 to 2021).
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The damage was repaired at the time, but in major refurbishment from 2017 it was found that the tower had sustained greater damage than originally thought, and asbestos, lead paint and broken glass were discovered, increasing the refurbishment cost from an estimated £29m to nearly £80m.
Although the clock will only be out of action for two years, the bells have to be silenced for the entire renovation period to protect the workers' hearing. The Big Ben bell weighs 13.76 tonnes and chimes at 118 decibels. At that volume, people would suffer hearing damage after just 14 seconds of exposure.
However, it is one of the most unusual aspects of the Elizabeth Tower. 114 steps up inside the tower is the Prison Room, but you don't need to worry about being locked up there yourself. The prison room was used for MPs who breached codes of conduct, but it hasn't been used since 1880.