UBS Bubble Index rises to 0.69 points – Risk in the homeownership market increases

On May 7, 2026, UBS published the latest edition of its Swiss Real Estate Bubble Index. The indicator climbed from 0.46 to 0.69 points in the first quarter. This is already the second strong quarterly jump in a row, after the previous quarter recorded the strongest movement since the late 1980s. UBS economists formally continue to classify the risk of overheating in the Swiss homeownership market as "moderate," but the path to the warning threshold of 1.0 points is visibly getting shorter.

What the Bubble Index actually measures

The UBS Bubble Index is not a price barometer in the classic sense, but an early warning system for imbalances. It condenses six sub-indices into a single measure, expressing how far the market has moved away from sustainable long-term levels.

Four comparison metrics are used: the ratio of home prices to rent levels, the ratio to household income, the ratio of mortgage loans to gross domestic product, and construction investment relative to GDP. In addition, there are two dynamic components: the real change in prices over three and ten years. UBS classifies the result into four zones. Below zero points, the market is considered undervalued, between 0 and 1 as balanced, between 1 and 2 as a risk zone, and from 2 points as a bubble. Historically, the index reached values of over 2 points during the real estate crisis of the early 1990s, which is why this threshold serves as a calibrated reference point.

Why 0.69 is more meaningful than a pure price figure

In recent weeks, Hypothek.ch has already reported on the price dynamics in the first quarter. According to UBS, residential property prices increased by 3.5 percent, while household income – despite higher inflation – fell slightly. However, a pure price increase says little about whether a market remains affordable. As long as incomes, rents, and mortgage loans grow in sync, higher prices can be justified from a macroeconomic perspective.

It is precisely this gap that the Bubble Index closes. It shows whether prices are rising faster than the fundamental supporting factors. In the first quarter of 2026, the gap has widened further: prices are rising, nominal incomes are falling, and mortgage debt is expanding again. The fact that the index increases this much in two consecutive quarters is a clearer signal than a single price jump. UBS cites as reasons above all the policy rate of the Swiss National Bank, which has been back at zero since the beginning of the year, and a weak economy, which makes residential property relatively attractive compared to other asset classes.

Regional hotspots

A familiar pattern stands out on UBS's regional map. Increased valuation risks are identified in the tourism regions of Grisons, where second homes drive up prices even further. Einsiedeln, the city of Zurich, and the canton of Nidwalden are also considered areas with above-average tense price levels in relation to local incomes. In rural areas of Jura, Valais, and Ticino, valuations remain comparatively moderate. Anyone buying in a hotspot should be aware that a correction there could trigger larger absolute losses than in a location with a balanced price structure.

Significance for affordability and purchasing decisions

For individual affordability calculations, the rise in the Bubble Index initially changes nothing. Banks continue to calculate with a hypothetical interest rate of around 5 percent, incidental costs of 1 percent of the property value, and amortization to two-thirds of the mortgage within 15 years. This calculated hurdle remains the decisive filter for whether a mortgage is approved.

Indirectly, however, the indicator does influence the market. If prices continue to grow faster than incomes, the required equity rises in absolute terms, the calculated burden increases, and the number of affordable properties decreases. Buyers in the aforementioned hotspots thus face a double hurdle: higher entry prices and higher valuation risk. While a fixed-rate mortgage with a long term locks in the interest cost, it does not lock in the market value of the property. With later refinancing, lower lending values may lead to adjustments.

Is 0.69 a warning signal?

In UBS's view, the risk remains "moderate." The index is still clearly below the warning threshold of 1.0 points, and the picture is not comparable to the pronounced overheating of the early 1990s. Quiet construction activity and strict regulatory requirements for equity and affordability further dampen the dynamics.

At the same time, the market is not idle. Two strong quarterly movements in a row, without a visible correction mechanism, are rather the exception in the history of the index. UBS continues, for the time being, to expect nominal price growth of around 3 percent per year, which would lead the index toward the warning zone in the foreseeable future without a trend reversal. A more restrictive monetary policy by the SNB or a significant recovery in real wages are the most plausible factors that could slow this path.

Outlook

The Bubble Index is not a timing tool, but a structural indicator. It does not predict when a correction will occur, only how vulnerable the market would be in the event of a shock. At 0.69 points, vulnerability is higher than a year ago, but there is no bubble. For buyers, the environment remains two-edged: low interest rates keep ongoing costs low, but valuation risk is increasing. Anyone purchasing property in the coming months would do well to take regional differences seriously and make conservative affordability assumptions.

Sources: UBS Swiss Real Estate Bubble Index Q1 2026, cash.ch, Swissinfo.