Gretzenbach: observed built density
Municipality in the canton of Solothurn · FSO no. 2576 · Parcel data as of July 2025
- Parcels
- 1’346
1 % of the canton
- Municipal zones
- 21
- Median utilization
- 79 %
Canton: 29 %
Switzerland: 10 %
- Median GFZ
- 0.30
Canton: 0.10
Switzerland: 0.09
- Median height
- 8.8 m
Canton: 9.2 m
Switzerland: 9.5 m
- Median floors
- 2.1
Canton: 2.2
Switzerland: 2.3
About Gretzenbach
Gretzenbach is a municipality in the canton of Solothurn. The parcel data lists 1’346 parcels in 21 municipal zone types. The zone types with the most parcels are Wohnzone 2 (614), Landwirtschaftszone (270) and Wohnzone Hang (126).
The median parcel is built to a volume utilization of 79 %; half of the parcels lie between 7 % and 115 %. The canton median is 29 %, so Gretzenbach sits above it.
The median building height is 8.8 m at 2.1 floors, and the median floor-area ratio (GFZ) is 0.30. Parcels built in the last 20 years reach a mean volume utilization of 112 % (141 parcels), higher than the 93 % across all building years.
Parcels by municipal zone
| Zone | Parcels | Median utilization |
|---|---|---|
| Wohnzone 2 | 614 | 101 % |
| Landwirtschaftszone | 270 | 0 % |
| Wohnzone Hang | 126 | 101 % |
| Verkehrszone Strasse | 69 | 0 % |
| Wald | 65 | 0 % |
| Arbeitszone | 40 | 97 % |
| Kernzone 2 | 33 | 77 % |
| Industriezone | 29 | 18 % |
| Verkehrsfläche Strasse | 19 | 0 % |
| Gewerbezone mit erlaubter Wohnnutzung | 16 | 83 % |
| Wohnzone 3 | 14 | 92 % |
| Grünzone | 13 | 16 % |
| Other zones (9) | 38 | - |
Volume utilization (ratioV)
Of the 1’326 parcels with a value, half lie between 7 % and 115 %. The median is 79 % and the mean 86 %.
Share of parcels by range
- below 50 %39 %
- 50 % to below 100 %25 %
- 100 % to below 150 %24 %
- 150 % and above12 %
Floor-area ratio (GFZ)
Of the 1’326 parcels with a value, half lie between 0.07 and 0.45. The median is 0.30 and the mean 0.29.
Share of parcels by range
- below 0.5082 %
- 0.50 to below 1.0016 %
- 1.00 to below 1.502 %
- 1.50 and above< 1 %
Building height
Of the 848 parcels with a value, half lie between 7.3 m and 10.2 m. The median is 8.8 m and the mean 8.8 m.
Share of parcels by range
- below 8 m35 %
- 8 m to below 12 m58 %
- 12 m to below 20 m6 %
- 20 m and above0 %
Number of floors
Of the 652 parcels with a value, half lie between 1.7 and 2.4. The median is 2.1 and the mean 2.1.
Share of parcels by range
- below 211 %
- 2 to below 369 %
- 3 to below 520 %
- 5 and above0 %
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 | 1’346 | 93 % |
| Last 60 years | 627 | 130 % |
| Last 40 years | 424 | 128 % |
| Last 20 years | 141 | 112 % |
| Last 15 years | 95 | 111 % |
| Last 10 years | 39 | 110 % |
| Last 5 years | 9 | 135 % |
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).