Rightmove has this morning announced what looks like an extraordinary tactical give-away as the portals war hots up.

In a surprise move, it will offer the technical specifications for its Real-time Data Feed (RTDF) free of charge to rival portals.

Development of Rightmove’s RTDF has been very costly, both in terms of research hours and financial investment.

It means the Rightmove version– which allows a property to be launched within minutes –  looks now to become the industry standard.

The offer could be interpreted as sheer generosity to  Zoopla or, more especially, Agents’ Mutual.

However, it is thought that both have been developing their own RTDFs at great expense, but could now have to walk away from their redundant investments.

The  money spent by Agents’ Mutual, and possibly Zoopla, may now have to be  thrown away, as none of the software suppliers will now want to adopt a different industry standard from the one Rightmove has said.

However, a Rightmove spokesperson said yesterday evening that there was no catch in the free offer. She insisted it was a move that Rightmove hoped would help agents and data-feed providers.

Rightmove is currently the only property portal that offers sales and lettings agents RTDF, which enables properties to be live to home-hunters within minutes.

Other data-feed uploads can take several hours or overnight for properties to appear.

On Rightmove, the feed works alongside new instant property alerts that home-hunters can sign up to so they can find out about new properties first.

Recent research shows that two-thirds of sellers (63%) would be more likely to choose an agent who could upload their property on to Rightmove immediately after property details are prepared, rather than wait several hours or longer.

James Micklethwait, Rightmove’s head of product development, said: “It took us 6,500 man hours to develop, test and implement RTDF.

“Other portals will save some of that effort by taking up this offer, but will still have several months to get their own systems ready, so it’s important they get cracking.

“This also means that the data-feed providers won’t have to find additional budget to develop a solution for another real-time format.

“It’s a helping hand from Rightmove as it means there is just one spec to deal with for the whole industry.”

Rightmove’s commercial director, Miles Shipside, said: “We are here to help agents and the industry improve service standards for home-movers, so if any property portal wants to approach us for our RTDF specification so they can copy and implement it into their own data feed, then give us a call.”

Rightmove said that research and experience of the thousands of branches which now benefit from real-time Rightmove feeds show that many landlords with a void looming, and many sellers, want to get full property exposure quickly.

It said RTDF can get their property launched immediately within minutes. Floor plans, photography and brochure sign-off can often delay marketing, so Rightmove’s goal is to help agents remove further inefficiency in the industry by allowing everyone access to RTDF, to provide an enhanced experience for home-hunters.

Ian Springett of Agents’ Mutual said: “I am pleased that Rightmove has reached this conclusion.

“The simple transfer of data between businesses which work for agents – software houses and portals – needs to be kept simple so unnecessary costs are avoided.”