The lending attitude index for home-backed loans came in at minus 7 for the July-September quarter, according to the Bank of Korea (BOK).
The index gauges banks' attitude toward an expanded loan to households and companies.
The reading below zero indicates banks planning to tighten loan standard.
The tightened standard for mortgage loans came as the government unveiled a set of measures to curb speculative investment in the property market in a bid to moderate the record-breaking household debts.
The lending attitude index for credit loan to households rose to 7 for the third quarter from zero in the prior quarter, meaning that banks planned to ease credit loan standard in the September quarter.
The index for bank loan to small firms stood at 17 in the third quarter, while the reading for loan to big corporations came to zero in the quarter.
The credit risk index for households was forecast to fall to 7 during the third quarter from 10 in the previous quarter.
The readings for small and big companies stood at 23 and 7 each for the third quarter.
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