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Building age in Sion

Municipality in the canton of Valais · FSO no. 6266

Building register (GWR) export of September 2026, parcel data of July 2025.

Key figures

Parcels with a building
5’062
4’689 of them with a known construction year
Median construction year
1975Canton: 1980Switzerland: 1976
Median building age
51 yearsCanton: 46 yearsSwitzerland: 50 years
Built 1960 or earlier
30.6%Canton: 29.4%Switzerland: 32.5%
Built after 2000
26.3%Canton: 29.5%Switzerland: 23.3%

About the building stock in Sion

The parcel data lists 5’062 parcels with a building in Sion. For 4’689 of them (92.6%) the federal building register (GWR) gives a construction year, taken from the newest building on the parcel. The median construction year is 1975, so the median parcel with a building is 51 years old. 30.6% of the parcels with a known year were built in 1960 or earlier and 26.3% after 2000. The largest period is 1981-2000 with 21.6%. For comparison, the median construction year is 1980 in the canton of Valais and 1976 in Switzerland. 373 parcels with a building have no usable construction year and are left out of the shares.

Construction-year histogram

Parcels with a building by construction period, as a share of the 4’689 parcels with a known year. The periods are not equally long, so read the bars as shares of the stock, not as building activity per year.

  1. 10.6%before 1920: 10.6%, 497 parcels
  2. 7.8%1920-1945: 7.8%, 365 parcels
  3. 12.2%1946-1960: 12.2%, 573 parcels
  4. 21.4%1961-1980: 21.4%, 1’004 parcels
  5. 21.6%1981-2000: 21.6%, 1’015 parcels
  6. 11.8%2001-2010: 11.8%, 551 parcels
  7. 11.4%2011-2020: 11.4%, 536 parcels
  8. 3.2%2021 and later: 3.2%, 148 parcels

Building age distribution

The same parcels grouped by the age of their newest building in 2026.

  • 66 years or older (built 1960 or earlier)30.6%1’435 parcels
  • 46 to 65 years (built 1961-1980)21.4%1’004 parcels
  • 26 to 45 years (built 1981-2000)21.6%1’015 parcels
  • Up to 25 years (built 2001 or later)26.3%1’235 parcels

How to read these figures

The parcel data links every parcel to the federal building register (GWR). A parcel counts once, with the construction year of its newest building. Where the register gives only a construction period, the middle of the period is used.

The figures count parcels with a building, not individual buildings. A parcel with several buildings counts once, and a parcel without a building is not counted.

Building age is 2026 minus the construction year. Every share divides by the parcels with a known construction year.

See it on the map

roots colors every parcel by construction year, from deep red for the oldest buildings to pale cream for the newest.

Open the roots map in Sion

Other large municipalities in the canton of Valais