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Building age in Olten

Municipality in the canton of Solothurn · FSO no. 2581

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

Key figures

Parcels with a building
2’975
2’970 of them with a known construction year
Median construction year
1938Canton: 1982Switzerland: 1976
Median building age
88 yearsCanton: 44 yearsSwitzerland: 50 years
Built 1960 or earlier
67.4%Canton: 28.5%Switzerland: 32.5%
Built after 2000
10.8%Canton: 23.5%Switzerland: 23.3%

About the building stock in Olten

The parcel data lists 2’975 parcels with a building in Olten. For 2’970 of them (99.8%) the federal building register (GWR) gives a construction year, taken from the newest building on the parcel. The median construction year is 1938, so the median parcel with a building is 88 years old. 67.4% of the parcels with a known year were built in 1960 or earlier and 10.8% after 2000. The largest period is 1920-1945 with 30.4%. For comparison, the median construction year is 1982 in the canton of Solothurn and 1976 in Switzerland. 5 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 2’970 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. 24.2%before 1920: 24.2%, 720 parcels
  2. 30.4%1920-1945: 30.4%, 904 parcels
  3. 12.7%1946-1960: 12.7%, 377 parcels
  4. 11.5%1961-1980: 11.5%, 342 parcels
  5. 10.3%1981-2000: 10.3%, 306 parcels
  6. 3.8%2001-2010: 3.8%, 114 parcels
  7. 6.3%2011-2020: 6.3%, 187 parcels
  8. 0.7%2021 and later: 0.7%, 20 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)67.4%2’001 parcels
  • 46 to 65 years (built 1961-1980)11.5%342 parcels
  • 26 to 45 years (built 1981-2000)10.3%306 parcels
  • Up to 25 years (built 2001 or later)10.8%321 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 Olten

Other large municipalities in the canton of Solothurn