Building age in Niederhelfenschwil
Municipality in the canton of St. Gallen · FSO no. 3423
Building register (GWR) export of September 2026, parcel data of July 2025.
Key figures
- Parcels with a building
- 981
- 961 of them with a known construction year
- Median construction year
- 1993Canton: 1977Switzerland: 1976
- Median building age
- 33 yearsCanton: 49 yearsSwitzerland: 50 years
- Built 1960 or earlier
- 17.8%Canton: 30.4%Switzerland: 32.5%
- Built after 2000
- 34.2%Canton: 22.0%Switzerland: 23.3%
About the building stock in Niederhelfenschwil
The parcel data lists 981 parcels with a building in Niederhelfenschwil. For 961 of them (98.0%) 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. 17.8% of the parcels with a known year were built in 1960 or earlier and 34.2% after 2000. The largest period is 1981-2000 with 33.6%. For comparison, the median construction year is 1977 in the canton of St. Gallen and 1976 in Switzerland. 20 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 961 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.
- 11.0%before 1920: 11.0%, 106 parcels
- 2.8%1920-1945: 2.8%, 27 parcels
- 4.0%1946-1960: 4.0%, 38 parcels
- 14.4%1961-1980: 14.4%, 138 parcels
- 33.6%1981-2000: 33.6%, 323 parcels
- 14.6%2001-2010: 14.6%, 140 parcels
- 15.2%2011-2020: 15.2%, 146 parcels
- 4.5%2021 and later: 4.5%, 43 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)17.8%171 parcels
- 46 to 65 years (built 1961-1980)14.4%138 parcels
- 26 to 45 years (built 1981-2000)33.6%323 parcels
- Up to 25 years (built 2001 or later)34.2%329 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 Niederhelfenschwil