Home and contents is something like $2K per year for me. $225K won't get you much unless you live in a small town or way way out. The bank will look at your outgoings and decide for themselves what you can afford.
Kiwisaver for first home can take a long time to process. You have to apply (from memory) at least a month before settlement date, but you have to have all your forms and procedures worked out well in advance. Ask your lawyer. Lawyer might cost you $2k, plus you may have other expenses like builders reports. If you don't get a house, say in a tender, you may still have significant legal bills.
Once you get the house you may need to do repairs.
Don't stretch yourself too thin.


