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Building age in Aarau

Municipality in the canton of Aargau · FSO no. 4001

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

Key figures

Parcels with a building
3’723
3’607 of them with a known construction year
Median construction year
1965Canton: 1986Switzerland: 1976
Median building age
61 yearsCanton: 40 yearsSwitzerland: 50 years
Built 1960 or earlier
43.3%Canton: 22.1%Switzerland: 32.5%
Built after 2000
19.6%Canton: 27.7%Switzerland: 23.3%

About the building stock in Aarau

The parcel data lists 3’723 parcels with a building in Aarau. For 3’607 of them (96.9%) the federal building register (GWR) gives a construction year, taken from the newest building on the parcel. The median construction year is 1965, so the median parcel with a building is 61 years old. 43.3% of the parcels with a known year were built in 1960 or earlier and 19.6% after 2000. The largest period is 1961-1980 with 18.9%. For comparison, the median construction year is 1986 in the canton of Aargau and 1976 in Switzerland. 116 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 3’607 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. 9.5%before 1920: 9.5%, 341 parcels
  2. 17.3%1920-1945: 17.3%, 623 parcels
  3. 16.6%1946-1960: 16.6%, 598 parcels
  4. 18.9%1961-1980: 18.9%, 680 parcels
  5. 18.2%1981-2000: 18.2%, 657 parcels
  6. 9.6%2001-2010: 9.6%, 346 parcels
  7. 8.1%2011-2020: 8.1%, 291 parcels
  8. 2.0%2021 and later: 2.0%, 71 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)43.3%1’562 parcels
  • 46 to 65 years (built 1961-1980)18.9%680 parcels
  • 26 to 45 years (built 1981-2000)18.2%657 parcels
  • Up to 25 years (built 2001 or later)19.6%708 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 Aarau

Other large municipalities in the canton of Aargau