Rorschach: observed built density
Municipality in the canton of St. Gallen · FSO no. 3215 · Parcel data as of July 2025
- Parcels
- 1’512
1 % of the canton
- Municipal zones
- 21
- Median utilization
- 86 %
Canton: 58 %
Switzerland: 10 %
- Median GFZ
- 0.95
Canton: 0.28
Switzerland: 0.09
- Median height
- 13.5 m
Canton: 9.6 m
Switzerland: 9.5 m
- Median floors
- 3.5
Canton: 2.4
Switzerland: 2.3
About Rorschach
Rorschach is a municipality in the canton of St. Gallen. The parcel data lists 1’512 parcels in 21 municipal zone types. The zone types with the most parcels are BauG Wohnzone W3 (370), BauG Wohnzone W2 (232) and BauG übriges Gemeindegebiet Strasse Weg (193).
The median parcel is built to a volume utilization of 86 %; half of the parcels lie between 34 % and 132 %. The canton median is 58 %, so Rorschach sits above it.
The median building height is 13.5 m at 3.5 floors, and the median floor-area ratio (GFZ) is 0.95. Parcels built in the last 20 years reach a mean volume utilization of 103 % (112 parcels), close to the 99 % across all building years.
Parcels by municipal zone
| Zone | Parcels | Median utilization |
|---|---|---|
| BauG Wohnzone W3 | 370 | 108 % |
| BauG Wohnzone W2 | 232 | 119 % |
| BauG übriges Gemeindegebiet Strasse Weg | 193 | 0 % |
| BauG Wohn-Gewerbezone WG3 | 192 | 97 % |
| BauG Kernzone K5 | 132 | 63 % |
| BauG Kernzone Altstadt | 92 | 119 % |
| BauG zentrumsnahes Wohnen WZ4 | 65 | 107 % |
| BauG Wohn-Gewerbezone WG4 | 55 | 69 % |
| BauG Zone für öffentliche Bauten und Anlagen | 43 | 61 % |
| BauG Gewerbe-Industriezone GI A | 37 | 100 % |
| BauG zentrumsnahes Wohnen WZ3 | 34 | 90 % |
| BauG Wohnzone W4 | 23 | 61 % |
| Other zones (9) | 44 | - |
Volume utilization (ratioV)
Of the 1’492 parcels with a value, half lie between 34 % and 132 %. The median is 86 % and the mean 91 %.
Share of parcels by range
- below 50 %30 %
- 50 % to below 100 %28 %
- 100 % to below 150 %24 %
- 150 % and above17 %
Floor-area ratio (GFZ)
Of the 1’492 parcels with a value, half lie between 0.31 and 1.69. The median is 0.95 and the mean 1.17.
Share of parcels by range
- below 0.5032 %
- 0.50 to below 1.0020 %
- 1.00 to below 1.5019 %
- 1.50 and above29 %
Building height
Of the 1’144 parcels with a value, half lie between 11.0 m and 16.3 m. The median is 13.5 m and the mean 13.9 m.
Share of parcels by range
- below 8 m6 %
- 8 m to below 12 m29 %
- 12 m to below 20 m58 %
- 20 m and above7 %
Number of floors
Of the 915 parcels with a value, half lie between 2.7 and 4.3. The median is 3.5 and the mean 3.6.
Share of parcels by range
- below 23 %
- 2 to below 316 %
- 3 to below 562 %
- 5 and above20 %
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 | 1’512 | 99 % |
| Last 60 years | 390 | 146 % |
| Last 40 years | 248 | 144 % |
| Last 20 years | 112 | 103 % |
| Last 15 years | 77 | 104 % |
| Last 10 years | 40 | 105 % |
| Last 5 years | 21 | 89 % |
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).