The biggest names in online home shopping are fighting over access to listings. A new consumer study suggests buyers visiting their websites are usually looking at the same houses.
The Consumer Policy Center’s October 13 report found that 74.3% of sampled properties appeared on Zillow, Redfin, Realtor.com and Homes.com. Another way to read the overlap: 83.4% appeared on at least three.
For agents selling clients on exposure, that is a useful reality check. Being visible on a major portal matters. Claiming one website opens an entirely different housing market requires evidence.
The research, written by CPC senior fellow Stephen Brobeck, examined more than 2,000 listings representing approximately 500 properties across 21 communities in or near 10 metropolitan areas during August and September.
That distinction matters. Researchers did not examine 2,000 separate homes, and the report explicitly cautions against treating its findings as nationally representative.
Its coverage focused on residential properties represented by agents, excluding builder, auction and owner listings. This was a snapshot of selected markets, not a complete audit of American housing inventory.
The broad overlap has a straightforward explanation: the portals draw extensively from the same local and regional multiple listing services.
However, similar inventory does not mean identical search results.
Some homes missing from a portal’s community search could still be found individually on that website. Geographic boundaries, property categories and differences in update timing helped explain discrepancies.
For a buyer, that can make a familiar address worth searching directly rather than assuming it disappeared because it failed to appear on a neighborhood map.
Compass listings provided a clearer exception.
The research identified 14 coming soon properties associated with Compass and its affiliated companies that appeared only on Redfin among the four portals. Redfin labeled them Early Access. Those properties were concentrated in four of the communities studied.
That finding supports a limited conclusion: checking another portal can uncover additional opportunities. It does not establish that Redfin has exclusive access to a large share of homes nationwide.
The more consequential difference may be how old a listing looks.
Brobeck told Real Estate News that Redfin was most likely to reset days on market downward. One property in Volente, Texas, appeared on Redfin with 27 hours of market time while the other three websites showed 77 days.
According to that reporting, Redfin’s figure changed after the property was repriced.
A buyer seeing a newly refreshed clock could interpret a stale listing as a fresh opportunity attracting immediate competition. That perception can influence urgency, negotiating confidence and the decision to request concessions.
But the study does not prove deliberate manipulation by a portal.
Most displayed market times agreed. Among substantial discrepancies, Homes.com had 20, Redfin had 14, Realtor.com had 13 and Zillow had eight. Every divergent Redfin figure was lower than figures on at least two competing portals.
Those are different measurements: Homes.com had more discrepancies overall, while Redfin’s identified differences consistently pointed downward.
For agents, the response should be practical.
Before recommending an offer, compare the property’s listing history with its current market time. Identify withdrawals, price changes and relistings. Ask whether the displayed number measures the present listing period or the property’s broader marketing history.
Then explain what that history actually means. A long marketing period can support tougher negotiations, but it does not automatically prove distress. A seller may have changed plans, completed repairs or simply started too high.
Sellers deserve the same discipline. Ask the listing agent to confirm where the home appears, whether its status is accurate and whether inquiries reach the intended representative.
Portal visibility alone also cannot measure an agent’s performance. Sellers should examine qualified inquiries, showing feedback, marketing execution and the quality of pricing advice.
The useful question is whether online exposure produces informed buyers who can realistically close.
The portal battle makes noise. The buyer still needs a clear picture of the property.
When websites disagree, a good agent investigates and explains why. A persuasive logo should never substitute for a verified listing history or a defensible offer price.
