The growth of house prices slumped to its slowest rate in a year in June as uncertainty surrounding the EU referendum took hold.
Based on its own lending figures, Halifax said house prices rose 8.4% in the year to June. But the change from May was just 1.2%, which it says is the slowest growth since December 2014.
The latest figures from Halifax mean the average house price in the UK is now £216,823, a new record high.
The data was collected before the outcome of the referendum was known.
Martin Ellis, senior economist at Halifax, said: "House prices continue to increase, albeit at a slower rate, but this precedes the EU referendum result, therefore it is far too early to determine any impact since.
However, Howard Archer, chief UK economist at IHS global Insight, believes the figures are a sign of a "serious risk of an extended and marked downturn" following the Brexit vote.
He said: "Despite the Halifax reporting a marked rise in house prices in June itself, we believe that the prospects for the housing market have deteriorated markedly following the Brexit vote.
"Housing market activity and prices now look to be at very serious risk of an extended, marked downturn following the UK's vote to leave the EU."