Olten: observed built density
Municipality in the canton of Solothurn · FSO no. 2581 · Parcel data as of July 2025
- Parcels
- 3’631
3 % of the canton
- Municipal zones
- 41
- Median utilization
- 100 %
Canton: 29 %
Switzerland: 10 %
- Median GFZ
- 0.80
Canton: 0.10
Switzerland: 0.09
- Median height
- 12.1 m
Canton: 9.2 m
Switzerland: 9.5 m
- Median floors
- 2.8
Canton: 2.2
Switzerland: 2.3
About Olten
Olten is a municipality in the canton of Solothurn. The parcel data lists 3’631 parcels in 41 municipal zone types. The zone types with the most parcels are Zweigeschossige Wohnzone (0.5) (794), Zweigeschossige Wohnzone (0.6) (765) and Dreigeschossige Wohnzone (477).
The median parcel is built to a volume utilization of 100 %; half of the parcels lie between 51 % and 139 %. The canton median is 29 %, so Olten sits above it.
The median building height is 12.1 m at 2.8 floors, and the median floor-area ratio (GFZ) is 0.80. Parcels built in the last 20 years reach a mean volume utilization of 544 % (268 parcels), higher than the 175 % across all building years.
Parcels by municipal zone
| Zone | Parcels | Median utilization |
|---|---|---|
| Zweigeschossige Wohnzone (0.5) | 794 | 140 % |
| Zweigeschossige Wohnzone (0.6) | 765 | 115 % |
| Dreigeschossige Wohnzone | 477 | 98 % |
| Verkehrszone Strasse | 323 | 0 % |
| Kernrandzone (Gestaltungsplanobligatorium) | 226 | 77 % |
| Dreigeschossige Mischzone | 216 | 89 % |
| Kernzone (Gestaltungsplanobligatorium) | 124 | 90 % |
| Zweigeschossige Wohnzone (0.4) | 92 | 116 % |
| Altstadtzone | 88 | 101 % |
| Zweigeschossige Mischzone | 79 | 85 % |
| Gewerbezone mit Wohnanteil | 70 | 102 % |
| Gewerbezone | 60 | 86 % |
| Other zones (29) | 317 | - |
Volume utilization (ratioV)
Of the 3’584 parcels with a value, half lie between 51 % and 139 %. The median is 100 % and the mean 109 %.
Share of parcels by range
- below 50 %25 %
- 50 % to below 100 %25 %
- 100 % to below 150 %29 %
- 150 % and above21 %
Floor-area ratio (GFZ)
Of the 3’584 parcels with a value, half lie between 0.43 and 1.20. The median is 0.80 and the mean 1.00.
Share of parcels by range
- below 0.5028 %
- 0.50 to below 1.0035 %
- 1.00 to below 1.5020 %
- 1.50 and above16 %
Building height
Of the 2’870 parcels with a value, half lie between 10.4 m and 13.9 m. The median is 12.1 m and the mean 12.7 m.
Share of parcels by range
- below 8 m6 %
- 8 m to below 12 m42 %
- 12 m to below 20 m46 %
- 20 m and above6 %
Number of floors
Of the 2’678 parcels with a value, half lie between 2.1 and 3.4. The median is 2.8 and the mean 2.9.
Share of parcels by range
- below 210 %
- 2 to below 325 %
- 3 to below 556 %
- 5 and above9 %
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 | 3’631 | 175 % |
| Last 60 years | 866 | 337 % |
| Last 40 years | 528 | 380 % |
| Last 20 years | 268 | 544 % |
| Last 15 years | 207 | 676 % |
| Last 10 years | 54 | 97 % |
| Last 5 years | 20 | 87 % |
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).