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Building age in Birr

Municipality in the canton of Aargau · FSO no. 4092

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

Key figures

Parcels with a building
790
772 of them with a known construction year
Median construction year
1993Canton: 1986Switzerland: 1976
Median building age
33 yearsCanton: 40 yearsSwitzerland: 50 years
Built 1960 or earlier
7.9%Canton: 22.1%Switzerland: 32.5%
Built after 2000
32.1%Canton: 27.7%Switzerland: 23.3%

About the building stock in Birr

The parcel data lists 790 parcels with a building in Birr. For 772 of them (97.7%) the federal building register (GWR) gives a construction year, taken from the newest building on the parcel. The median construction year is 1993, so the median parcel with a building is 33 years old. 7.9% of the parcels with a known year were built in 1960 or earlier and 32.1% after 2000. The largest period is 1981-2000 with 35.8%. For comparison, the median construction year is 1986 in the canton of Aargau and 1976 in Switzerland. 18 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 772 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. 2.1%before 1920: 2.1%, 16 parcels
  2. 1.6%1920-1945: 1.6%, 12 parcels
  3. 4.3%1946-1960: 4.3%, 33 parcels
  4. 24.2%1961-1980: 24.2%, 187 parcels
  5. 35.8%1981-2000: 35.8%, 276 parcels
  6. 14.9%2001-2010: 14.9%, 115 parcels
  7. 12.0%2011-2020: 12.0%, 93 parcels
  8. 5.2%2021 and later: 5.2%, 40 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)7.9%61 parcels
  • 46 to 65 years (built 1961-1980)24.2%187 parcels
  • 26 to 45 years (built 1981-2000)35.8%276 parcels
  • Up to 25 years (built 2001 or later)32.1%248 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 Birr

Other large municipalities in the canton of Aargau