Why the public allowed to go inside big ben?

The public is not currently allowed inside Big Ben. The Elizabeth Tower, which houses Big Ben, has been undergoing renovations since 2017 and is not expected to be completed until 2023. Prior to the renovations, visitors were able to take guided tours of the Elizabeth Tower and climb the 334 steps to the belfry to see Big Ben up close. However, these tours have been suspended during the renovations.