The northland seems to be better covered by their own councils GIS (Graphical Information System) and in better (almost scary!) detail. You can get down to cars in the car parks, and as you get down to street level the street name and property boundries are superimposed on the screen.
The real scary bit is is the layer options you can set to see just about any feature you want and if you select the "get info" bit you can view plot number and plot size. Nice tool if your looking at properties or just have tons of time to kill..
http://www.wdc.govt.nz/gis/
Boz