The average price tag on a home fell by just over £1,000 in August, according to a property website.
It marked the first monthly fall in the average price of property coming to market so far in 2021 and was predominantly due to a cooling at the higher end of the market, the website added.
The fall was driven by bigger homes with at least four bedrooms, it said.
By contrast, activity remains strong in the “mass market” sector including homes with fewer bedrooms.
Despite the monthly dip, the average asking price is still 5.6% higher than a year ago.
Tim Bannister, Rightmove’s director of property data, said: “New sellers dropping their asking prices can ring economy alarm bells, especially when it’s the first time so far this year, so it’s important to dig underneath the headline figures.
“Firstly, we are in the holiday season which means that sellers have traditionally tempted distracted buyers with lower prices, though that might well be less applicable this year with many buyers having to stay a lot closer to home.
“Indeed, our analysis shows that average prices have only fallen in the upper-end sector, which is usually more affected by seasonal factors such as the summer holidays and has also seen the greatest withdrawal of stamp duty incentives.
“The mass market of properties that cater for first-time buyers and second-steppers is still seeing high demand and upwards price pressure leading to new, record high, average prices in those sectors.
“In England there remains a smaller stamp duty saving of up to £2,500, though the window to take advantage of this saving by buying now and completing by the end of September is pretty much closed.”
Rightmove predicts that there will be an autumn bounce. In the first week of August, individual buyer inquiries to agents were up by 56% on the same period in the pre-Covid year of 2019.
The number of sales agreed was also up by 9% on the same period in 2019.
Many sellers are choosing to have a buyer lined up subject to contract before trying to secure their own purchase, Rightmove said.
Mr Bannister added: “Sell before you buy is a successful tactic in fast moving markets, especially the current one where any new listings popular in both specification and location are selling in days rather than weeks.”
Toby Philips, managing director for Countrywide said: “Although we’re seeing glimmers of a downturn in house prices as a result of the tapered stamp duty holiday deadline, we’re seeing this predominantly in the premium end of the market.
“Across our southern region, in particular, we’re seeing a continued surge in the volume of new buyers looking to purchase the limited housing stock available. This is creating a fast moving, favourable market for sellers.
“We can see little sign of this abating and would go as far as predicting an autumn bounce in prices if buyer demand continues as it is.”