Transactions and house prices could fall across the country in the event of a no-deal Brexit, business advice firm KPMG has warned.

It says that the average price drop would be 6%, but could be as high as 20%.

It is forecasting that London and Northern Ireland would be most affected by price falls, dropping 7% and 7.5% respectively, with Wales and the east midlands  least affected, each falling 5.4%.

KPMG says that while it expects the price correction to be milder than the crash of 2008, a “further shock to buyer confidence could tip the overall market into a much deeper slump”.

However, even if there is a deal, KPMG says house prices will still fall in some areas – by 4.7% in London and by 2.2%  in Northern Ireland. It believes house prices would be largely unaffected elsewhere, and go up in Scotland and the north-west.

The firm also believes that sales volumes will be more affected by a no-deal Brexit than prices.

Jan Crosby, head of housing at KPMG, said: “Transaction volumes will likely fall much more than prices.”

The Bank of England has modelled a possible 30% fall in house prices in a worst case scenario following a no-deal Brexit.