All greater Christchurch land is being progressively mapped into land zones.
You can check the land zone and technical category that applies to your property at http://cera.govt.nz/my-property
Areas in the flat land residential red zone have area-wide land and infrastructure damage, and an engineering solution to repair the land would be uncertain, costly, and is likely to be highly disruptive.
In the Port Hills, red zone areas are those which are either:
- affected by cliff collapse and there are immediate risks to life, land remediation is not considered viable and infrastructure would be difficult and costly to maintain, or
- affected by rock roll and the risk to life is considered unacceptable, is unlikely to reach an acceptable level in a reasonable timeframe, and protective works to mitigate the life safety risk are not considered practicable.
More information: Residential red zone
Green zone areas are generally considered to be suitable for residential construction.
What happens next and when will depend on a number of factors including:
- the status of the land (TC1, TC2, TC3 or TC N/A - not applicable)
- Council consent requirements
- on-going seismic activity
- foundation guidelines
More information: Residential green zone technical categories
Land classified as white meant that complex geotechnical issues relating to land slip and rockroll required further assessment and observation before land decisions could be made.
There are no longer any white zones, all such zones having now been rezoned to red or green.
Land classified as orange meant that engineers needed to undertake further investigation.
There are no longer any orange zones, all such zones having now been rezoned to red or green.
Maps of affected areas