as others said, it really depends on property, purchase price and comparison sales in area.
I revalued a property exactly after a week of settlement date:
Purchase price: $231K
Valuation(after reno): $245K
in contrast:
I signed a contract for a property purchase in perth and valuation came short by $10k off contract of sale price. we provided 3 latest sales higher than our contract price, but valuer doesn't want to change valuation, so i am up for $10k shortfall payment.