New standards for foundations have been introduced for areas of Christchurch most prone to liquefaction in an earthquake.
Under the new standards all of the flat part of the city has been divided into three colour zones, which will determine what level of foundations that repairs, or new builds, have to meet.
The standards will require a geotechnical investigation into the ground conditions and the most suitable foundations in areas most prone to liquefaction.
Those in the areas least prone to liquefaction can use standard foundation techniques.
Earthquake Recovery Minister Gerry Brownlee says the change will allow those with damaged homes to rebuild with more confidence.
He says if a home has not been damaged there is no need or requirement to bring the foundation up to the new standards.
Residents can check the zoning of their home on the landcheck website (www.landcheck.org.nz).