Commonwealth Bank is again lifting mortgage rates for investor and interest-only loans as lenders continue to tweak pricing to keep in line with regulatory demands.

The bank's fixed-rate interest-only owner-occupier loans are going up by 0.25 percentage points on Friday, as are most of its fixed-rate principal and interest loans for investors.

Most of its fixed-rate interest-only investor loan rates are going up by 0.5 percentage points, while the one-year fixed rate rises by 0.25 percentage points.

Owner-occupier principal and interest rates remain unchanged.

CBA, which lifted its variable rates for interest-only investor loans by 0.12 percentage points on April 3, again attributed the hikes to the need to abide by industry regulations.

"Commonwealth Bank is increasing home loan fixed interest rates for investment home loans and interest only customers to ensure we continue to meet our regulatory requirements," the bank said in a statement on Friday.

Worried about a buildup of risks in the housing market, the Australian Prudential Regulation Authority since 2014 has restricted banks to a 10 per cent annual increase in the amount they lend to property investors.

In March, it told them they must also limit interest-only loans to 30 per cent of new residential mortgages.