"The relative value of homes in different price bands now poses a serious risk to homeowners and investors in the run-up to March 2019."
Its data shoed that places like Stevenage, Watford and Hastings are will "feel the full brunt of the no-deal sledgehammer" because the price gap between flats and houses are among the greatest in Britain and have widened the fastest.
The average detached house in Stevenage was 197% more than the average flat (£553,697 vs £186,422) - the fifth largest gap anywhere in the UK with growth of 68.2% in five years.
The combination of these two measures makes the Hertfordshire town the most polarised property market in Britain, followed by Watford, Bedfordshire, Hastings, East Sussex.
The price gap between flats and houses in Watford has grown 53.2% to 201.4%, while in Hastings it has widened by 63% to 184.7%.
The warning comes after Bank of England Governor Mark Carney warned a chaotic withdrawal from the EU could cause house prices to crash as much as 33% in a worst case scenario.
At the other end of the spectrum was Doncaster, where the average detached house was 140.6% more than the average flat, while the gap between prices over the five years increased just 18.4%.
Doncaster was followed by Stoke-on-Trent, with a price gap of 131.2% that had grown just 26.9%, and Blackpool where prices were 153.9% apart, after widening 12.3% in five years.
James Newbery, investment manager at British Pearl, commented: “Parts of the UK property market have made considerable gains and, the relative value of homes in different price bands now poses a serious risk to homeowners and investors in the run-up to March 2019.
“The fallout from no-deal is most likely to be felt hardest in the capital’s commuter belt, where markets have moved too far and too fast. That is bad news for both ordinary investors and homeowners, particularly those who have borrowed to make their purchase.
“However, the study also shows being diligent about the area you buy in can help you avoid these increased risks, with huge variations being seen in this polarisation measure across the country.”
