Riehen: observed built density
Municipality in the canton of Basel-Stadt · FSO no. 2703 · Parcel data as of July 2025
- Parcels
- 4’807
22 % of the canton
- Municipal zones
- 26
- Median utilization
- 73 %
Canton: 99 %
Switzerland: 10 %
- Median GFZ
- 0.44
Canton: 1.35
Switzerland: 0.09
- Median height
- 10.3 m
Canton: 14.6 m
Switzerland: 9.5 m
- Median floors
- 2.4
Canton: 3.3
Switzerland: 2.3
About Riehen
Riehen is a municipality in the canton of Basel-Stadt. The parcel data lists 4’807 parcels in 26 municipal zone types. The zone types with the most parcels are Bauzone 2A innerhalb Siedlungsgebiet (1’453), Bauzone 2R innerhalb Siedlungsgebiet (1’034) and Landwirtschaftszone (550).
The median parcel is built to a volume utilization of 73 %; half of the parcels lie between 9 % and 107 %. The canton median is 99 %, so Riehen sits below it.
The median building height is 10.3 m at 2.4 floors, and the median floor-area ratio (GFZ) is 0.44. Parcels built in the last 20 years reach a mean volume utilization of 111 % (304 parcels), higher than the 84 % across all building years.
Parcels by municipal zone
| Zone | Parcels | Median utilization |
|---|---|---|
| Bauzone 2A innerhalb Siedlungsgebiet | 1’453 | 85 % |
| Bauzone 2R innerhalb Siedlungsgebiet | 1’034 | 80 % |
| Landwirtschaftszone | 550 | 0 % |
| Grünzone ausserhalb Siedlungsgebiet | 421 | 5 % |
| Bauzone 2 innerhalb Siedlungsgebiet | 347 | 97 % |
| Wald | 202 | 0 % |
| Bauzone 3 innerhalb Siedlungsgebiet m. überlag. Nutzung Wohn-u. Arbeitsmischgeb | 168 | 82 % |
| Schonzone mit überlagernde Nutzung Wohn- u. Arbeitsmischgebiet innerhalb Siedlun | 126 | 129 % |
| Bauzone 2 innerhalb Siedlungsgebiet m. überlag. Nutzung Wohn-u. Arbeitsmischgeb | 99 | 86 % |
| Bauzone 3 innerhalb Siedlungsgebiet | 82 | 86 % |
| Schonzone innerhalb Siedlungsgebiet | 61 | 85 % |
| Grünzone innerhalb Siedlungsgebiet | 53 | 95 % |
| Other zones (14) | 211 | - |
Volume utilization (ratioV)
Of the 4’762 parcels with a value, half lie between 9 % and 107 %. The median is 73 % and the mean 77 %.
Share of parcels by range
- below 50 %36 %
- 50 % to below 100 %35 %
- 100 % to below 150 %20 %
- 150 % and above9 %
Floor-area ratio (GFZ)
Of the 4’761 parcels with a value, half lie between 0.08 and 0.77. The median is 0.44 and the mean 0.52.
Share of parcels by range
- below 0.5056 %
- 0.50 to below 1.0029 %
- 1.00 to below 1.5011 %
- 1.50 and above4 %
Building height
Of the 3’432 parcels with a value, half lie between 8.5 m and 12.0 m. The median is 10.3 m and the mean 10.2 m.
Share of parcels by range
- below 8 m18 %
- 8 m to below 12 m57 %
- 12 m to below 20 m25 %
- 20 m and above< 1 %
Number of floors
Of the 3’582 parcels with a value, half lie between 1.5 and 3.1. The median is 2.4 and the mean 2.4.
Share of parcels by range
- below 224 %
- 2 to below 330 %
- 3 to below 543 %
- 5 and above3 %
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 | 4’807 | 84 % |
| Last 60 years | 1’625 | 116 % |
| Last 40 years | 811 | 107 % |
| Last 20 years | 304 | 111 % |
| Last 15 years | 208 | 116 % |
| Last 10 years | 165 | 114 % |
| Last 5 years | 82 | 124 % |
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).