Are homebuyers living in a fool's paradise? Property values have remained buoyant thanks mainly to low interest rates. According to economist Simon Rubinsohn at Gerrard, the typical mortgage repayment in London accounts for just 20% of earnings, compared with a long-term average of 27%. In the rest of the country, a home loan will only eat an average 14% of pay, compared to a typical 22% over the past 30 years. That has encouraged people to move into bigger and better properties.