In 2017, Parliament embarked on a full restoration of the clock, which was described as an architectural and technological challenge of unprecedented scale. The project was primarily aimed at repairing the damage done by German bombs during World War II.

The iconic Elizabeth Tower, which houses the bell known as Big Ben, underwent its most extensive restoration in history between 2017 and 2022. While the tower was originally completed in 1859, it had never received a comprehensive overhaul. The project was necessary to address significant structural issues, including decaying stonework and corrosion of the cast-iron roof. Architects and engineers discovered that damage from World War II bombings had never been fully repaired, leading to further deterioration over the decades. The restoration involved dismantling the entire clock mechanism, repairing thousands of intricate iron components, and replacing over 1,000 stones. Modern upgrades were also added, such as an elevator for accessibility, a new fire alarm system, and energy-efficient LED lighting behind the clock faces. This multi-year effort, costing approximately £80 million, was essential to safeguard the tower's future and ensure that the famous chimes could continue to ring out across London for another century.