Swiss bank UBS has initiated coverage of the UK estate agent sector.

The bank expects UK-wide housing transactions to fall 6% this year and 5% the next – with a 10% drop in London in 2017.

It has put Foxtons and Savills at ‘buy’, Countrywide at ‘neutral’ and Purplebricks at ‘sell’.

It said that Purplebricks’ valuation is stretched.

However, UBS said online-only agents are structurally altering the landscape of the sector and are gaining “significant” market share as consumer awareness of them, and willingness to use them, both grow.

UBS said conventional agents most able to differentiate themselves, such as Foxtons and Savills, justify a premium price and will be most successful in withstanding the changes.

As far as Foxtons is concerned, UBS said the UK referendum result has added significant uncertainty, in particular for the London housing market.

It has factored in a declining market in the second half of this year and 2017 within its forecasts.

However, in the medium term it sees organic growth potential at the company, driven by a roll-out of five to seven new branches per year.

It said Countrywide was most at risk from this shift to onliners, with pressure on commissions over the last six years indicative of its limited ability to respond to online competition.

On Purplebricks, UBS said: “With the business not yet in profit and on EV/sales of 18x, we see valuation risks.

“The model has been proven fit for growth, but the self-employed nature of franchisees, as well as the large revenue cut that Purplebricks takes from its franchisees, for us creates question marks around scalability.

“There are also significant costs associated with growing a web-based company.”

Foxtons’ shares finished up 2.75p on the day at 130p, wiping out the falls after its profit warning of last month.

Savills, however,  ended down 3p at 645p.