Bubble Index 2026 as a Travel Map

01 — What UBS actually scored

The 2026 edition covers 23 cities, scored on a scale where anything above 1.5 means high bubble risk, 1.0–1.5 elevated, 0.5–1.0 moderate and below 0.5 low. Market data run through the second quarter of 2026; the editorial deadline was 21 September. Two cities sit in the high band, five in elevated — and the composition of that top seven is the story of the year.

02 — Wealth is the new income

The report’s central finding is a regime change. Housing demand in the trophy cities is no longer set by local wages but by accumulated financial wealth: strong equity markets have boosted affluent households’ purchasing power, enabling larger down payments and outright cash purchases, while the AI investment boom is generating substantial — and highly concentrated — new wealth. UBS is explicit that prime districts now diverge from citywide trends, with San Francisco and Seoul as the clearest evidence.

Miami is the arithmetic of the new regime: home prices have tripled over 15 years while household incomes rose just 25%. For the traveller, the translation is direct — rate power in these cities tracks the equity market, not the local payroll. As long as portfolios compound, the suites stay full at any price; when equities flinch, the highest-score cities discount first.

03 — The fortress cities: Zurich and Tokyo

Zurich tops the index at 1.69. Real prices have risen nearly 140% in two decades against rental growth of 40% and income growth of 30%; vacancy is close to zero, listings of owner-occupied homes are two-thirds below their level of 20 years ago, and the price-to-rent ratio of 46 is the highest in the study — Geneva follows at 40, itself elevated at 1.12. Tokyo, at 1.54, has added roughly 50% in real terms in seven years, with prices and rents both up 6% year on year. In fortress cities there is no structural rate relief coming: pay up, shift dates, or shift neighbourhoods.

04 — Dubai’s hard braking

Dubai keeps an elevated score of 1.16, but the chapter title — “Hard braking” — carries the news. After real price growth above 10% in 2025, the boom stopped abruptly at the onset of the conflict involving Iran; real prices have fallen back to mid-2025 levels and real rents sit below their year-earlier mark. This is precisely the two-sided market our Dubai dossiers have tracked since spring. We devote a companion signal to what the reset is worth.

05 — Lisbon debuts elevated — the gap closes

Lisbon enters the index for the first time and lands directly in the elevated band at 1.04: real prices up nearly 7% a year for a decade — the fastest rate among all 23 cities — plus another 10% since mid-2025. In September we priced the Algarve at a 20–40% discount to comparable Costa del Sol product and called it Europe’s clearest convergence trade. A capital city in the elevated band pulls the national market behind it: the convergence we forecast is arriving on schedule, and the discount window is narrowing.

06 — Momentum and laggards

Among the momentum trades, Seoul rose 11% over four quarters on AI-hub capital, and Madrid — up 9% year on year — is the strongest city in the moderate band, though tighter short-term-rental rules began cooling demand in spring 2026. Hong Kong is rebounding sharply from a 30% real decline between 2018 and 2025, yet still requires around 15 years of average income to buy a 60-square-metre flat — the least affordable market in the study. The laggards are Canadian and British: Toronto, nearly 30% below its 2022 peak, is the weakest record in the index; Vancouver’s sales have hit a 25-year low; and London — more than 15% below 2021 in real terms — recorded its first population decline since the late 1980s, pandemic years aside.

07 — How to use the map

Sources: UBS Global Real Estate Bubble Index 2026 (23 cities; market data as of Q2 2026; editorial deadline 21 September 2026); TIO destination dossiers for Dubai, Lisbon and the Algarve. Figures verified as of 13 October 2026.