Grenchen: observed built density
Municipality in the canton of Solothurn · FSO no. 2546 · Parcel data as of July 2025
- Parcels
- 4’060
3 % of the canton
- Municipal zones
- 49
- Median utilization
- 78 %
Canton: 29 %
Switzerland: 10 %
- Median GFZ
- 0.43
Canton: 0.10
Switzerland: 0.09
- Median height
- 10.3 m
Canton: 9.2 m
Switzerland: 9.5 m
- Median floors
- 2.4
Canton: 2.2
Switzerland: 2.3
About Grenchen
Grenchen is a municipality in the canton of Solothurn. The parcel data lists 4’060 parcels in 49 municipal zone types. The zone types with the most parcels are Wohnzone, Bauklasse 3 (915), Wohnzone, Bauklasse 2 (796) and Wohnzone, Bauklasse 2 am Hang (542).
The median parcel is built to a volume utilization of 78 %; half of the parcels lie between 9 % and 119 %. The canton median is 29 %, so Grenchen sits above it.
The median building height is 10.3 m at 2.4 floors, and the median floor-area ratio (GFZ) is 0.43. Parcels built in the last 20 years reach a mean volume utilization of 124 % (438 parcels), higher than the 84 % across all building years.
Parcels by municipal zone
| Zone | Parcels | Median utilization |
|---|---|---|
| Wohnzone, Bauklasse 3 | 915 | 94 % |
| Wohnzone, Bauklasse 2 | 796 | 100 % |
| Wohnzone, Bauklasse 2 am Hang | 542 | 78 % |
| Verkehrszone Strasse | 343 | 0 % |
| Landwirtschaftszone | 339 | 0 % |
| Wohnzone, Bauklasse 4 | 125 | 93 % |
| Verkehrsfläche Strasse | 116 | 0 % |
| Zentrumszone, Bauklasse 4 | 101 | 158 % |
| Arbeitszone 1, Bauklasse 4 | 100 | 86 % |
| Zentrumszone, Bauklasse 5 | 81 | 109 % |
| Wohnzone, Bauklasse 3 am Hang | 73 | 131 % |
| Arbeitszone 2, Bauklasse 5 | 63 | 80 % |
| Other zones (37) | 466 | - |
Volume utilization (ratioV)
Of the 4’001 parcels with a value, half lie between 9 % and 119 %. The median is 78 % and the mean 81 %.
Share of parcels by range
- below 50 %35 %
- 50 % to below 100 %29 %
- 100 % to below 150 %22 %
- 150 % and above13 %
Floor-area ratio (GFZ)
Of the 3’998 parcels with a value, half lie between 0.08 and 0.74. The median is 0.43 and the mean 0.54.
Share of parcels by range
- below 0.5058 %
- 0.50 to below 1.0028 %
- 1.00 to below 1.508 %
- 1.50 and above6 %
Building height
Of the 2’826 parcels with a value, half lie between 8.3 m and 13.0 m. The median is 10.3 m and the mean 10.9 m.
Share of parcels by range
- below 8 m21 %
- 8 m to below 12 m47 %
- 12 m to below 20 m30 %
- 20 m and above2 %
Number of floors
Of the 2’362 parcels with a value, half lie between 1.9 and 3.3. The median is 2.4 and the mean 2.7.
Share of parcels by range
- below 28 %
- 2 to below 345 %
- 3 to below 542 %
- 5 and above6 %
Building age cohorts
Mean volume utilization of the parcels built inside each window, from all years on record down to the last five. The windows overlap: the last 20 years include the last 5.
| Built in | Parcels | Mean utilization |
|---|---|---|
| All years | 4’060 | 84 % |
| Last 60 years | 1’398 | 115 % |
| Last 40 years | 970 | 119 % |
| Last 20 years | 438 | 124 % |
| Last 15 years | 334 | 131 % |
| Last 10 years | 165 | 132 % |
| Last 5 years | 65 | 105 % |
How to read this page
room shows observed built density: what has been built on the parcels, not what the zoning permits. Volume utilization (ratioV) compares the built volume of a parcel with the reference volume of its municipal zone type. The floor-area ratio (GFZ) is floor area divided by parcel area; building height and number of floors are taken from the buildings on a parcel. Figures pool all municipal zones of the area. Medians and quartiles are read from bins 10 points (ratioV), 0.1 (GFZ), 2 m (height) and 1 floor wide, so they are exact to within one bin; means are exact. A parcel counts in a distribution only when the parcel data has a value for it. The floors distribution leaves out parcels without a building (0 floors).