It's the AIM-listed company with what's been described as a 'stratospheric' valuation.
Purplebricks is a new breed of estate agent with an online focus. It made headlines when it raised almost £50mil in around 24 hours last week to fund a US expansion.
It's now valued in the region of £647mil - close to the major players Countrywide and Foxtons.
So what's behind the rise? Share Radio's Peta Fuller reports.
Surveyors have warned of a "dire shortage" of housing in the UK, which is continuing to drive up prices.
The warning, from the Royal Institution of Chartered Surveyors comes ahead of a government White Paper on housing supply, expected this month.
Rics said that house hunters were returning to the market after the EU referendum in June, but there was not enough property for them to buy.
Simon Rose speaks to RICS's chief economist Simon Rubinsohn for more.