The capital of Valais, overlooked by its hills of Valère and Tourbillon, Sion holds the deepest property market in the canton between vineyards and the Rhône plain.
Flats in Sion change hands around CHF 6,300 per m², well above what the rest of Valais pays. The premium is priced into the land more than into the building, which is why two similar houses here can be valued very differently. Paying 15 percent more than the cantonal median buys location, not floor space. The same budget moved to a neighbouring commune would typically add a room, and that is the trade most buyers here have already made. Out of 67 communes measured in Valais, Sion sits at position 13. The communes immediately above and below are the ones a buyer will actually compare against, far more than the cantonal average.
Houses carry a premium of 8 percent per square metre over flats in Sion, CHF 6,800 against CHF 6,300. Households buying a house here are mostly trading up from a flat nearby, so demand holds even when volumes drop. The last twelve months added 4.0 percent in Sion. Rises of this order usually come from a shortage of listings rather than from a wave of new buyers, and they unwind faster than they build.
Within the Sion district, Sion lands 0 percent from the local median. A cantonal average mixes city and countryside, so it flatters some communes and penalises others. The district figure removes most of that distortion. No single period defines Sion, though 1946-1960 leads with 12 percent. That mix works in a buyer's favour, since you can choose between period character and low running costs without leaving the commune.
At 3.3 rooms and 90 m² on average, homes in Sion are sized for households rather than single occupants. If you are looking for a studio or a two-room flat, expect a thinner choice and less room to negotiate. Half the flats sold in Sion went above CHF 6,300 per m² and half below, which puts the commune 15 percent from the Valais median. One exceptional sale barely moves a median, and that is why we use it instead of an average. The 25-year record opens at CHF 3,800 and closes at CHF 8,200, +116 percent apart. Use it to sanity-check an estimate rather than to project forward, since nothing in the series promises the next decade repeats it.
Sion turns over enough stock to give a reliable read. The practical benefit shows at negotiation, where both sides can point to comparable sales from the same year, which shortens the distance between asking price and signature. A price level like the one in Sion leaves little room for approximation. An estimate built on the actual characteristics of your property, floor, condition, view and exposure, will tell you more than any commune average.
Building stock data: Federal Register of Buildings and Dwellings, FSO, updated August 3, 2026
Market data updated on August 24, 2026
A range set against the price levels of your commune and the profile of your property.
Value my property →Around CHF 6,300 per m² for a flat, which is 15 percent from the Valais median. Houses are priced separately and usually land somewhere else entirely, so work from the figure that matches your property type.
The reference is CHF 6,800 per m² in Sion. It averages a small number of sales, since houses change hands far less often than flats, so treat it as a bracket to work inside rather than as a price.
12 percent of homes in Sion date from 1946-1960. That age band sets the technical agenda for a buyer here, since insulation, heating system and windows are what decide running costs for the next twenty years.