Landlords in London last year made a £248,120 average gross gain from selling their properties, according to data collected by Hamptons International.
The data shows that the above figure is 3.1 times the average gain across England and Wales, where the average landlord made a £79,770 gross gain last year.
Regionally, landlords in the North East made the smallest average gain at £11,810. This was followed by Yorkshire and the Humber at £26,870.
In contrast, after London, landlords in the South East made the largest average gains at £108,220. Followed by the East at £88,410.
The analysis is based on the occupants having inhabited the property for 9.6 years.
Furthermore, rental growth rose to 2.1 per cent in Great Britain as of April 2019, its highest rate since January 2018 – with the cost of a new let currently at £972.
Year-on-year, rents rose in every region, with London leading the way rising 3.9 per cent, from £1,672 to £1,738.
Meanwhile, Scotland saw the smallest rise in the year to April 2019, rising 0.3 per cent from £628 to £631.
Hamptons International head of research Aneisha Beveridge comments: “The average landlord who sold their BTL last year did so for nearly £80,000 more than they paid for it.
“Over the 9.6 years that the average landlord has owned their BTL house price growth has driven their gains, with prices having risen around 30 per cent over the period.
“However, given lower expected future house price growth and tighter mortgage regulation, more investors are shifting their focus from capital gains to yields.”