london luxury block of flats housing skyscraper glass development rich A new luxury penthouse development at One Hyde Park (L) is located next to The Hyde Park Hotel in Knightsbridge on April 16, 2014 in London, England. The capital continues to see growth and house price inflation is rising at a much faster rate than the rest of the United Kingdom. Peter Macdiarmid/Getty Images

LONDON – The supercharged London housing market is slowing down.

According to data from Hometrack UK, the annual rate of house price growth in London declined from 13% a year ago to just 3.5% last month, the lowest growth rate since 2012.

"Looking ahead we expect current trends to continue with house price growth losing momentum in cities across southern England where housing unaffordability is at a record high and has priced large numbers of households out of the market," Hometrack said.

"Weaker investor demand supports this trend, taking demand out of the market and adding to supply as investors look to rationalise and de-leverage portfolios in the wake of tax changes."

If inflation rises above the 2-3% growth expected, London could see its first real decline in house prices since 2011, according to the study.

A combination of Brexit uncertainty, stamp duty changes and a rule change to ensure foreign companies must register before buying property has taken the heat out of the market.

Here's the chart: