The average amount released by Responsible Life customers has risen 31% in 12 months, climbing from £86,000 to £112,700 in April.
The average value of homes being used to secure lifetime mortgages is 19.4% higher than a year ago, at £487,000 — which is nearly double the average UK house price of £256,405.
Even after accounting for house price inflation (10.2%), the average value of the properties being mortgaged was still 8.2% higher.
The broker also believes that a pandemic home improvement boom buoyed by the extra time people were forced to spend at home during repeated lockdowns has helped to drive up the level of borrowing.
Home improvement remains the second most popular reason to use a lifetime mortgage.
Steve Wilkie, executive chairman of Responsible Life, said: “There’s no doubt there has been a middle-class stampede for lifetime mortgages over the past year thanks to interest rates sinking to historic lows.
“Wealthier homeowners have cottoned on to how rates have come down and now see lifetime mortgages as an affordable way to improve their standard of living in retirement.
“Gone are the days when they were considered a product of last resort. That couldn’t be further from the truth now.
“The pandemic has also played its part in driving up the level of borrowing. Repeated lockdowns have not only spurred huge housing demand but there has also been a home improvement frenzy.
“This remains the second most popular reason to take out a lifetime mortgage.”