Average asking prices for August were 4.6% higher than a year earlier.
The number of monthly sales agreed is the highest measured since Rightmove began tracking this figure 10 years ago, up by 38% on 2019, and 20% higher than the previous record, set in March 2017.
However, asking prices did reach new record highs in August in seven nations and regions - Scotland, Wales, Yorkshire and the Humber, North West England, the East Midlands, the East of England, and the West Midlands.
The summer months are usually quieter for the housing market as people go on holiday.
Only in London was there the typical 2 per cent monthly fall in asking prices, with prices up nearly everywhere else in Britain other than London's commuter belt. This is because "sellers try to tempt holiday distracted buyers".
But the number of houses available is down 8% compared to this time past year, meaning although people are looking to move, they have fewer houses to choose from.
However, in London, prices recorded a downward skid and fell around 2 per cent over the past month.
Rather than just a release of existing pent-up demand due to the suspension of the housing market during lockdown, there's an added layer of additional demand due to people's changed housing priorities after the experience of lockdown.
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The Royal Institution of Chartered Surveyors (RICS) also warned that the mini-boom in property activity might turn sour once the government's jobs subsidy programme closes and stamp duty rises again.
"Not only are we seeing an unusually busy summer period, but also parts of the lending and legal sectors are having to cope with capacity constraints, as some staff will still be on furlough while many will still be working from home", Miles added.
He also said that the increase in sales was not just due to the chancellor's stamp duty cut in England and Northern Ireland. The property website said that amid a busy pace of the housing market that is likely to prevail in the short-term, it is advised to be alerted of the wider economic concerns that could unfold in the times to come. London has 69% more properties coming to market, with the South East at 60% and the East at 56%.
"Record levels of buyer activity lead to processing delays and mean that patience is required to get sales agreed to completion", Rightmove said. With a ten year high, that is expected to increase further whilst buyers approach the end of the stamp duty holiday, there is the worry on how time scales and deadlines will be affected.
Post lockdown period has seen an increased demand for homes with spacious living spaces and garden areas.
Russell Quirk, property expert at MovingHomeAdvice.com, said: "This latest set of numbers from the especially authoritative Rightmove must surely correct even the most morose of property market bulls, for now at least".
Dominic Murphy, running director of DM & Co estate agents in Solihull, reported: "I suspect that the market place will continue being buoyant right until career losses filter by way of and truly start out to hit the marketplace in total drive".