The Town Hall was declared quake-prone in 2009, it was closed in 2013 following the Seddon earthquake, with strengthening work starting in 2019.
The quake-strengthening project involves lifting and propping the building to install new base isolators (flexible pads that reduce shaking in an earthquake) and extensive deep piling, while having to protect and restore the fabric of the category 1 heritage-listed building.
Wellington City Council Chief Executive Barbara McKerrow says at the time the current budget of $145.3 million was approved in 2019, the Council was fully aware of the project risks it was taking on that could not be fully and accurately costed at the time.