Gempen: observed built density
Municipality in the canton of Solothurn · FSO no. 2474 · Parcel data as of July 2025
- Parcels
- 1’286
1 % of the canton
- Municipal zones
- 14
- Median utilization
- 7 %
Canton: 29 %
Switzerland: 10 %
- Median GFZ
- 0.07
Canton: 0.10
Switzerland: 0.09
- Median height
- 8.9 m
Canton: 9.2 m
Switzerland: 9.5 m
- Median floors
- 2.1
Canton: 2.2
Switzerland: 2.3
About Gempen
Gempen is a municipality in the canton of Solothurn. The parcel data lists 1’286 parcels in 14 municipal zone types. The zone types with the most parcels are Landwirtschaftszone (407), Wald (382) and Wohnzone 2-geschossig (263).
The median parcel is built to a volume utilization of 7 %; half of the parcels lie between 3 % and 41 %. The canton median is 29 %, so Gempen sits below it.
The median building height is 8.9 m at 2.1 floors, and the median floor-area ratio (GFZ) is 0.07. Parcels built in the last 20 years reach a mean volume utilization of 103 % (77 parcels), higher than the 43 % across all building years.
Parcels by municipal zone
| Zone | Parcels | Median utilization |
|---|---|---|
| Landwirtschaftszone | 407 | 0 % |
| Wald | 382 | 0 % |
| Wohnzone 2-geschossig | 263 | 81 % |
| Kernzone | 59 | 94 % |
| Verkehrsfläche Strasse | 53 | 0 % |
| Verkehrszone Strasse | 43 | 0 % |
| Wohnzone 2-geschossig, reduziert | 37 | 85 % |
| Reservezone Wohnzone, Mischzone, Kernzone und Zentrumszone | 16 | 0 % |
| Freihaltezone | 9 | 9 % |
| Zone für öffentliche Bauten und Anlagen | 6 | 40 % |
| Sondernutzungszone Sonnhalde | 4 | 101 % |
| Gewerbezone ohne Wohnen | 3 | 100 % |
| Other zones (2) | 4 | - |
Volume utilization (ratioV)
Of the 1’269 parcels with a value, half lie between 3 % and 41 %. The median is 7 % and the mean 33 %.
Share of parcels by range
- below 50 %76 %
- 50 % to below 100 %13 %
- 100 % to below 150 %8 %
- 150 % and above4 %
Floor-area ratio (GFZ)
Of the 1’269 parcels with a value, half lie between 0.03 and 0.10. The median is 0.07 and the mean 0.14.
Share of parcels by range
- below 0.5090 %
- 0.50 to below 1.008 %
- 1.00 to below 1.501 %
- 1.50 and above1 %
Building height
Of the 346 parcels with a value, half lie between 7.4 m and 10.4 m. The median is 8.9 m and the mean 9.0 m.
Share of parcels by range
- below 8 m33 %
- 8 m to below 12 m59 %
- 12 m to below 20 m9 %
- 20 m and above0 %
Number of floors
Of the 268 parcels with a value, half lie between 1.7 and 2.5. The median is 2.1 and the mean 2.2.
Share of parcels by range
- below 210 %
- 2 to below 366 %
- 3 to below 524 %
- 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 | 1’286 | 43 % |
| Last 60 years | 270 | 108 % |
| Last 40 years | 193 | 106 % |
| Last 20 years | 77 | 103 % |
| Last 15 years | 44 | 104 % |
| Last 10 years | 18 | 96 % |
| Last 5 years | 4 | 121 % |
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).