Spain’s hottest housing market for billionaires in 2026

A coastal spot in Mallorca is attracting wealthy international buyers as Knight Frank forecasts a 40% rise in Spain’s billionaire population by 2031.
Spain’s Hottest Billionaire Housing Market
Deià, Mallorca. Vicenç Salvador Torres Guerola, CC BY-SA 3.0 Creative commons

One village in the Balearic Islands is emerging as one of Spain’s most closely watched ultra-prime housing markets for 2026, according to Knight Frank’s The Wealth Report 2026. The global property consultancy identifies the small north-west Mallorca location among the neighbourhoods expected to outperform. 

Why Deià is emerging as the Spanish luxury market to watch

Deià sits beneath the Teix mountain on Mallorca’s north-west coast, where the availability of high-end homes is limited by both geography and regulation.

Knight Frank says strict planning controls and UNESCO protection restrict supply in the village, which is characterised by stone houses, terraced olive groves and views across the mountains and Mediterranean. In a market where large-scale development is not readily possible, existing homes in the most desirable positions carry particular value.

The report identifies Deià as a destination where the appeal extends beyond short holiday use. Demand is increasingly shaped by buyers seeking homes suitable for longer stays and relocation, as well as second-home ownership.

Who is buying in Deià?

According to Knight Frank, buyers in Deià are primarily from Britain, the United States and northern Europe.

Second-home owners remain the main buyer group, though the report says the village is drawing a broader international audience as longer stays and relocations become more common.

This reflects Knight Frank’s wider finding that ultra-wealthy households are increasingly spreading their lives and property holdings across several jurisdictions.

What buyers pay for property in Deià

Knight Frank puts the starting price for a two-bedroom village house in Deià at around US$2.4 million. Four-bedroom villas with swimming pools and sea views start at approximately US$8 million, according to the report. The price guidance reflects the ultra-prime nature of a market where the supply of luxury homes is constrained. 

The average property price across the Balearic Islands, according to idealista's June 2026 report, was €5,337 per m². At that average, a 150-square-metre villa would be marketed at roughly €800,550, before taking account of factors such as plot size, condition, sea views, a pool, privacy or the severe supply constraints affecting locations including Deià.

The Balearic Islands’ highest reported municipal asking prices were in Formentera (€9,002 per m²), Sant Joan de Labritja (€8,221 per m²) and Santa Eulalia del Río (€8,036 per m²). 

At those respective average prices, a 150-square-metre home would equate to approximately:

  • Formentera: €1,350,300
  • Sant Joan de Labritja: €1,233,150
  • Santa Eulalia del Río: €1,205,400

Explore luxury homes for sale in Deià.

Spain’s expanding wealthy population is supporting prime demand

Knight Frank forecasts that Spain’s billionaire population will increase from 38 in 2026 to 53 in 2031, representing growth of 40% over five years. Spain ranks 14th in the consultancy’s global table for forecast billionaire-population growth over that period.

The report also projects growth in Spain’s ultra-high-net-worth individual population, from 6,355 in 2021 to 6,845 in 2026, before reaching 10,633 in 2031.

Madrid and Marbella show the breadth of Spain’s luxury market

Madrid recorded 5% price growth and is among the European cities attracting internationally mobile wealth, according to Knight Frank. The report groups Madrid with Milan and Malta as locations drawing European buyers looking for more tax-efficient bases, while retaining access to major-city business, culture and connectivity.

American demand has also become more apparent in the capital. US buyers accounted for more than 8% of Madrid prime sales in 2025, up from 0.5% in 2018, Knight Frank says.

Marbella recorded 8.1% price growth and remains a leading European second-home market for buyers seeking generational family retreats.