UK house prices fell 0.7 per cent in December and price growth for last year dropped to its slowest pace since 2013, according to the latest Nationwide House Price Index.

The average price of a house fell to £212,281 in December, compared with £214,044 in November, and the rate of growth dipped to 0.5 per cent for 2018, down from 2.6 per cent the year before.

The building society said the primary cause of the slowdown was the “unusually uncertain” economic outlook.

“It is likely that the recent slowdown is attributable to the impact of the uncertain economic outlook on buyer sentiment, given that it has occurred against a backdrop of solid employment growth, stronger wage growth and continued low borrowing costs,” said Nationwide chief economist Robert Gardner.

“Near term prospects will be heavily dependent on how quickly this uncertainty lifts, but ultimately the outlook for the housing market and house prices will be determined by the performance of the wider economy – especially the labour market.

“The economic outlook is unusually uncertain. However, if the economy continues to grow at a modest pace, with the unemployment rate and borrowing costs remaining close to current levels, we would expect UK house prices to rise at a low single-digit pace in 2019.”

Northern Ireland recorded the strongest growth, with prices rising 5.8 per cent in 2018, and Wales recorded an average increase of 4 per cent, while Scotland and England were considerably slower with growth of 0.9 per cent and 0.7 per cent, respectively.

Meanwhile, the London market saw another decline, with prices falling 0.8 per cent last year, the sixth consecutive quarter of slowing growth recorded in the capital.

Property experts said Brexit uncertainty was to blame for the disappointing data.

“The disappointing house price growth is no surprise, as the majority of buyers and sellers begin to wind down for the festive season, with the majority on the fence whilst Brexit negotiations continue,” said Mark Readings, founder and managing director of online estate agency House Network.

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“As we move into 2019, with political instability fears around Brexit still playing a huge part in the lack of certainty amongst both buyers and sellers, we expect to see this confidence slowly regained once the government’s plans to leave the EU are finalised.”

However, economists forecast an improvement in house price growth over the coming year.

“While the supply of homes for sale also has dwindled, the balance of demand and supply has shifted in buyers’ favour. That said, we continue to doubt that a sustained period of falling house prices is likely,” said Samuel Tombs at Pantheon Macroeconomics.

“The unemployment rate is at a 43-year low and business surveys still point to steady growth in employment over the coming months.