There are almost half a million property listings on the latest challenger to the established property portals.
OneDome, which acquired Nethouseprices last year and launched its own free property portal last Feberuary, says there are now 480,000 listings across the two sites.
The two businesses are on track to integrate shortly.
Traffic is running at over 15m monthly visits, with OneDome claiming to generate roughly 1.7 property enquiries per minute to agents.
OneDome CEO Babek Ismayil said the business is offering an alternative to major portals and is now a player in the listings market.
OneDome launched its website contractually offering free listings for 100 years.
Ismayil said he is expecting more agents to join.
He also said that OneDome has become a listing partner with Facebook Marketplace.
Agents who provide OneDome with a direct feed of their listings will have them automatically listed on Facebook Marketplace, again at no charge.
Agents receive leads in the same way as they do from OneDome.
Ismayil said: “Our mission is to build the next generation property platform, which offers free listings and leads to the estate agency industry and provides them an opportunity to generate extra revenue.
“We will continue with our mission to make property marketing free for agents.”
He added: “We are very pleased to work with the Facebook Marketplace team as their listing partner.
“Facebook Marketplace doesn’t charge for listings and has over 800m people using it globally. We see this as a great benefit to estate agents, particularly when the cost of marketing of properties is on the rise via other channels.”
OneDome has so far been focused on sales, enabling buyers and sellers to conduct an end to end property transaction online, including engaging with agents, mortgage brokers and conveyancers. They can also register the property title online.
OneDome has told agents that it is offering more than free listings – it will even pay for them in some circumstances.