The inflation of property prices by online portals has become one of the biggest challenges in Spain’s housing market. Buyers and sellers alike often rely on platforms such as Idealista reports to set prices. Yet behind these numbers can lie an artificial bubble.

Meet Manuel, a proud owner who’s decided it’s time to sell his coastal house. He fires up Idealista, sees that the average price in his neighborhood is €4,500/m², and—blink and you’ll miss it—concludes his well‑worn parquet and avocado‑green tiles must be worth €5,200/m². “It’s my home,” he shrugs to his estate agent, “I know my value.” And no amount of market data will budge him.

Across town, Carmen—also a proud owner—logs onto Fotocasa. She spots a few recently sold flats at €4,700/m², but her newly repainted “rose quartz” kitchen surely tips the scales to €5,000/m². So up goes her asking price. Voilà: a self‑reinforcing spiral of over‑ambitious listings that nobody’s brave enough to deflate.

a whopping 41.000 homes on the market

1. Why Portals Spark a Price Arms Race

Real‑estate sites (Idealista, Fotocasa, Habitaclia) scrape every listing and convert it out a neat €/m² average. But when Manuel and Carmen both lean on those figures—and then add a generous “because it’s mine”—the algorithm dutifully cranks the next neighborhood average a notch higher. Rinse and repeat, and soon everyone’s asking prices look like they’ve inhaled helium.

2. The Mechanics Behind the Spiral

• Automated Averages: Portals take all active listings—Manuel’s €5,200/m² and Carmen’s €5,000/m² included—and compute a simple mean.

• Stale “Hope Prices”: Listings that linger for months at unrealistic levels remain in the data pool, skewing averages upward.

• Premium Placement: Manuel paid extra to “feature” his ad, so the portal shows it more—boosting the perceived norm further.

3. The Real‑World Toll

• Buyers’ Wallets: They anchor their expectations on these inflated averages and end up over‑budgeting (and over‑borrowing).

• Agents’ Headaches: As the local agent, you’re stuck explaining that this might not be the real market price, but after all these are their houses so little you can do to convince them to lower the prices!

• Market Uncertainty: With nobody admitting who started the bubble, every listing just copies the last, like a game of “follow the leader.”

  

  Average looking house in Calafell

4. How to Break the Cycle

1. Filter by Freshness: Ignore listings older than 180 days—those are usually Manuel’s and Carmen’s “hope prices.” And take this advice: eventually THEY’LL LOWER THE PRICE!

2. Use Multiple Portals: If different portals shows different prices: always trust the lower number and inform to the agent/owner.

3. Set a Safety Margin: Base your offer or appraisal on the official average minus 5–10% to account for baby‑boomer optimism.

4. Make sure your agent acknowledges the fact when a property is over-priced and is not alluring you into a “expat trap”.

A Personal Note (Not a Critique)

This is simply what I observe every day working in Catalonia (and it goes the same for any coastal region in the whole of Spain) real‑estate trenches—not a judgment on Manuel, Carmen, or anyone trying to fund their next move. After all, they’re not just inflating numbers for fun: they need enough equity to buy a flat closer to medical services and family, where prices have skyrocketed too!. My aim is to shed light on the market quirks so we can all make smarter decisions—and maybe help Manuel and Carmen find their next home without breaking the bank.

More info on this article on 5 días newspaper.