While U-turns in UK government policy are expected to calm markets and ease pressure on mortgage rates, this has not fed through to consumers yet, according to research from Moneyfacts.
The average rate for two-year fixed rate loan rose to 6.53% on Tuesday, Moneyfacts said.
That was the highest rate for such a deal since August 2008.
The average interest rate on a five-year fixed rate mortgage has risen to 6.36%, Moneyfacts said, the highest since November 2008.
Mortgage rates have been rising for months as central banks raise interest rates to try to get to grips with soaring inflation, but have increased sharply since September due to market fallout from the government’s mini-budget.
While new Chancellor Jeremy Hunt has of his predecessor Kwasi Kwarteng’s tax cuts, the pressure on mortgage rates has not yet eased.
At least 100,000 people per month are coming to the end of their current mortgage deal, and face steep rises in monthly repayments.