I'm three months into my property search with preapproval expiring shortly but I have found a property of interest which I'll bid at next weekend.
However, after recent interest rate changes, I have found a comparison rate better than the lender I have preapproval with (0.06% pa difference which will amount to ~$800/yr) with similar features (redraw/offset, no fees). Is it worth trying to get a new preapproval with the new lender (Athena) in the next week or should I just go with my existing lender (and refinance sooner rather than later)?
Absolutely you should try to get new pre-approval sorted out ASAP. As long as you have the 10% payment at auction win, you still have a little time to sort it out afterwards too. At very least you have the original to fall back on. No brainer.