More landlords are selling up amid fears of an imminent capital gains rise.
According to Zoopla, the percentage of homes for sale that had previously been rented has risen in every area of the country.
The trend is most prominent in London and the southeast, where previously rented properties for sale make up 13% and 8% of the market respectively, compared with 5% and 4% a year earlier.
However, the homes for sale represent less than 1% of total rental stock.
The chancellor ordered a review of capital gains tax last July, the results of which could be published as part of next week’s budget.