An important point is that the materials used should be free of heavy metals, most particular zinc
When purchasing you should explicitly point out that no zinc should be present in the coating.

Cages of brass (= alloy of zinc and copper) should not be used either. Aviaries decorated with turrets and overlaying extensions are not suitable for the vigorous and agile kakariki.

When buying an aviary/cage, you should also make sure that the bottom grill can be removed without creating a gap big enough for the bird to escape.
A gap should not be wider than 2cm to prevent a kakariki from being able to sticking his head through.If, in those unfortunate circumstances, the bird should panic, chances are it won’ t be able to release himself.
See pic to the right, the gap in the feeding shaft had to be widened using a screwdriver as wig in order for Maya to be able to free herself.

Floor grills are not suitable for kakariki because they love to forage on the floor looking for food. Here are some pictures that show how much they love to scratch and play with the bedding at the bottom of this aviary.

You could decide on building your own aviary. Use stainless steel wire.
For the frame you could use either wood or pre fab aluminum square tubes.

Indoors the wood does not necessarily have to be impregnated. Since kakariki master in spreading the juices of fruit etc. all over the place, a lacquer layer simplifies the cleaning of the aviary.
Use certified, children safe, acrylic paint .
Even olive oil or linseed oil can be used. However, if the birds have access to the balcony, impregnation is necessary.
 

The basic equipment should consist out of swings and natural wooden- or mineral perches.
Perches should vary in diameter and not have too smooth a surface.
Tubes made of cork are often used as sleeping quarters and serve as occupational therapy (see also "Behaviour").
Leave the birds enough room to romp!

There is a heated debate going on about cage bedding's. We like to use a mix containing bird sand, wood pellets and/or beech chips.
The latter not too close to a water bowl because of the risk of mold. Hemp bedding has proofed itself as well and is our most common used cage bedding.
We place the waterbowls on large coasters to avoid/reduce the risk of wet bedding. (please check "bathing"). After cleaning the aviary, we always mix a few grains of food into the bedding, in order to meet their need to grubb and scratch.