If you are building or installing a swimming or spa pool you will need consent regardless of the size or capacity of the pool.
It is also your responsibility to fence your pool in accordance with the Fencing of Swimming Pools Act 1987. This is to protect young children from the danger of drowning. All pools over 400mm in depth must be fenced, whether they are in-ground, above-ground or spa pools. Inflatable and temporary pools over 400 mm in depth, also require fencing. 
Resource consent information has moved
You'll find it on the Auckland Council Website
Moving towards a single council
The councils in the Auckland region have been working cooperatively to move smoothly to the new Auckland Council on 1 November 2010.
The cooperation has helped us standardise the most popular Resource Consent online information and produce a single set of associated forms, which you can use now at any local government organisation in the Auckland area. This includes resource consent swimming and spa pools.
Visit the Auckland Council website for comprehensive information on: