Economic experts are predicting an increase in house prices if National and ACT take over in October.

Commentator Bernard Hickey says house prices could rise by 10-20 percent under a National-ACT Government after some key policy changes are implemented.

Bernard Hickey reckons both parties will likely make changes to interest deductibility, bright-line property rules and introduce a tighter fiscal policy around spending and borrowing.

"You'd likely see in the weeks after an election win, very busy auction houses, very busy open homes."

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