A multi-million dollar repair job has begun to re-level the Christchurch Art Gallery.
The building, which weighs 30,000 tonnes, had one side sink 15 centimetres as a result of the earthquakes.
Engineering consultants Aurecon are leading the job to level it. Technical director Steve Hogg said raising and levelling the building would be done by pumping quick-setting grout between the foundations and newly-built columns beneath the floor.
Mr Hogg said a job of this size had never been attempted in New Zealand, however they had successfully used the technique on a smaller building in Christchurch.
The gallery is set to re-open in late 2015. It was used as Civil Defence headquarters following the February 2011 earthquake.