More people would search for a property on just Rightmove rather than search on a combination of Rightmove and Zoopla.

However, the majority would search all three sites, Rightmove, Zoopla and OnTheMarket.

A new survey also shows marked lack of consumer awareness, with one in four saying they would not search for a property on any of these sites, or did not know which portal they would use.

The independent survey, conducted for consumer site SellingUp, asked 1,000 people at the start of this month – six weeks after the launch of OnTheMarket – the question:

“Imagine you are looking to buy a property in the UK today. Of these three property websites, Rightmove, Zoopla and OnTheMarket.com – which would you be likely to search on?”

The answers were:

Just Rightmove – 20.98%

Just Zoopla – 7.19%

Just OnTheMarket.com – 2.10%

Rightmove and Zoopla – 17.18%

Rightmove and OnTheMarket.com – 2.00%

Zoopla and OnTheMarket.com – 0.80%

All: Rightmove, Zoopla and OnTheMarket.com – 25.57%

None of them – 13.49%

Don’t know – 10.69%

Oliver Lewis, editor of the site which advises home movers, said: “We ran the survey to find out what the implications might be for property sellers whose estate agents were no longer advertising on Rightmove or Zoopla, which are by far the two biggest portals.

“There is clearly a lot of overlap where buyers search on both Rightmove and Zoopla and perhaps others besides, but there are also significant numbers who only search on their particular favourite site.

“We understand that many estate agents feel they need to quit either Rightmove or Zoopla because they might pay less to be with OnTheMarket.com, but sellers need to be aware that if their properties are not on both of the big two portals they are likely to be seen by fewer potential buyers.

“The survey shows that if an estate agent has already decided it must join OnTheMarket.com for commercial reasons, then it probably makes more sense to stick with Rightmove over Zoopla as its ‘one other portal’.

“However, SellingUp.com, as a supporter of the best deal for property sellers, would urge estate agents to put pressure on OnTheMarket.com to drop its restrictive rule so that sellers can benefit from as wide a coverage for their properties as possible.”

The full survey is here

* Separately, another new survey released yesterday evening from an estate agency IT firm found that almost 91% of agents who have gone with OnTheMarket had stopped using Zoopla, and that 63% were using the new portal. However, the survey was answered by only 146 agents out of a total of 7,000 who had been sent it, said a spokesperson for easymate software. She admitted the response had been disappointing.