The moves come as bets ramp up on the timing for Bank of England interest rate cuts, with forecasters predicting a fall of 75bps by the end of 2024.
The so-called 'top-of-the-ladder' sector saw its strongest price growth since 2014 in April, Rightmove said.
The number of highly energy-efficient homes in the UK is steadily growing — check out this selection on Earth Day.