Au (SG): observed built density
Municipality in the canton of St. Gallen · FSO no. 3231 · Parcel data as of July 2025
- Parcels
- 2’278
1 % of the canton
- Municipal zones
- 23
- Median utilization
- 70 %
Canton: 58 %
Switzerland: 10 %
- Median GFZ
- 0.41
Canton: 0.28
Switzerland: 0.09
- Median height
- 9.2 m
Canton: 9.6 m
Switzerland: 9.5 m
- Median floors
- 2.2
Canton: 2.4
Switzerland: 2.3
About Au (SG)
Au (SG) is a municipality in the canton of St. Gallen. The parcel data lists 2’278 parcels in 23 municipal zone types. The zone types with the most parcels are BauG Wohnzone W2b (896), BauG Wohn-Gewerbezone WG3 (234) and BauG übriges Gemeindegebiet Strasse Weg (185).
The median parcel is built to a volume utilization of 70 %; half of the parcels lie between 9 % and 103 %. The canton median is 58 %, so Au (SG) sits above it.
The median building height is 9.2 m at 2.2 floors, and the median floor-area ratio (GFZ) is 0.41. Parcels built in the last 20 years reach a mean volume utilization of 130 % (291 parcels), higher than the 76 % across all building years.
Parcels by municipal zone
| Zone | Parcels | Median utilization |
|---|---|---|
| BauG Wohnzone W2b | 896 | 84 % |
| BauG Wohn-Gewerbezone WG3 | 234 | 81 % |
| BauG übriges Gemeindegebiet Strasse Weg | 185 | 0 % |
| BauG Wohn-Gewerbezone WG2 | 168 | 89 % |
| BauG Landwirtschaftszone | 163 | 0 % |
| BauG Wohnzone W3 | 128 | 75 % |
| BauG Wohnzone W1 | 105 | 72 % |
| BauG Zone für öffentliche Bauten und Anlagen | 62 | 49 % |
| BauG Kernzone K4 | 56 | 62 % |
| Hinweis.Wald | 49 | 0 % |
| BauG Kernzone K3 | 43 | 92 % |
| BauG Gewerbe-Industriezone GI A | 37 | 95 % |
| Other zones (11) | 152 | - |
Volume utilization (ratioV)
Of the 2’246 parcels with a value, half lie between 9 % and 103 %. The median is 70 % and the mean 69 %.
Share of parcels by range
- below 50 %36 %
- 50 % to below 100 %37 %
- 100 % to below 150 %20 %
- 150 % and above7 %
Floor-area ratio (GFZ)
Of the 2’246 parcels with a value, half lie between 0.09 and 0.66. The median is 0.41 and the mean 0.46.
Share of parcels by range
- below 0.5061 %
- 0.50 to below 1.0030 %
- 1.00 to below 1.507 %
- 1.50 and above2 %
Building height
Of the 1’619 parcels with a value, half lie between 7.6 m and 11.3 m. The median is 9.2 m and the mean 9.6 m.
Share of parcels by range
- below 8 m29 %
- 8 m to below 12 m51 %
- 12 m to below 20 m19 %
- 20 m and above1 %
Number of floors
Of the 1’298 parcels with a value, half lie between 1.8 and 3.0. The median is 2.2 and the mean 2.4.
Share of parcels by range
- below 210 %
- 2 to below 355 %
- 3 to below 532 %
- 5 and above4 %
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 | 2’278 | 76 % |
| Last 60 years | 1’096 | 102 % |
| Last 40 years | 756 | 114 % |
| Last 20 years | 291 | 130 % |
| Last 15 years | 216 | 142 % |
| Last 10 years | 141 | 160 % |
| Last 5 years | 70 | 200 % |
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).