The proportion of housing loans written at high loan-to-valuation ratios rose during the September quarter, according to the Australian Prudential Regulation Authority.APRA's latest report on the property exposures of authorised deposit-taking institutions, published yesterday, shows that of A$76.6 billion of new residential loans approved by ADIs in the September quarter, A$10.8 billion (14.1 per cent by value) had loan-to-valuation ratios of 90 per cent or above.Another 20.6 per cent of the value of new loans had LVRs of between 80 and 90 per cent.Lenders approved $2.3 billion of residential loans (three per cent by value) outside serviceability, which means that the lender considered that an exception to its serviceability test was appropriate.In the June quarter, 13.5 per cent of the value of new loans had LVRs of 90 per cent or more, and 19.3 per cent had LVRs of between 80 and 90 per cent.