Cologny: observed built density
Municipality in the canton of Geneva · FSO no. 6617 · Parcel data as of July 2025
- Parcels
- 1’329
2 % of the canton
- Municipal zones
- 9
- Median utilization
- 70 %
Canton: 49 %
Switzerland: 10 %
- Median GFZ
- 0.27
Canton: 0.23
Switzerland: 0.09
- Median height
- 9.3 m
Canton: 9.3 m
Switzerland: 9.5 m
- Median floors
- 2.1
Canton: 2.4
Switzerland: 2.3
About Cologny
Cologny is a municipality in the canton of Geneva. The parcel data lists 1’329 parcels in 9 municipal zone types. The zone types with the most parcels are Zone de développement 5 (1’071), Zone de développement 3 (104) and Zone agricole (67).
The median parcel is built to a volume utilization of 70 %; half of the parcels lie between 9 % and 106 %. The canton median is 49 %, so Cologny sits above it.
The median building height is 9.3 m at 2.1 floors, and the median floor-area ratio (GFZ) is 0.27. Parcels built in the last 20 years reach a mean volume utilization of 107 % (255 parcels), higher than the 82 % across all building years.
Parcels by municipal zone
| Zone | Parcels | Median utilization |
|---|---|---|
| Zone de développement 5 | 1’071 | 73 % |
| Zone de développement 3 | 104 | 30 % |
| Zone agricole | 67 | 0 % |
| Zone de développement 4B protégée | 50 | 169 % |
| Zone de protection de la nature et du paysage | 21 | 0 % |
| Zone sportive | 8 | 6 % |
| Zone de verdure | 6 | 50 % |
| Zone des bois et forêts | 1 | 0 % |
| Zone des eaux et des rives | 1 | 100 % |
Volume utilization (ratioV)
Of the 1’317 parcels with a value, half lie between 9 % and 106 %. The median is 70 % and the mean 78 %.
Share of parcels by range
- below 50 %38 %
- 50 % to below 100 %34 %
- 100 % to below 150 %18 %
- 150 % and above10 %
Floor-area ratio (GFZ)
Of the 1’317 parcels with a value, half lie between 0.08 and 0.42. The median is 0.27 and the mean 0.45.
Share of parcels by range
- below 0.5083 %
- 0.50 to below 1.0011 %
- 1.00 to below 1.501 %
- 1.50 and above4 %
Building height
Of the 944 parcels with a value, half lie between 7.7 m and 11.3 m. The median is 9.3 m and the mean 10.0 m.
Share of parcels by range
- below 8 m28 %
- 8 m to below 12 m54 %
- 12 m to below 20 m16 %
- 20 m and above2 %
Number of floors
Of the 752 parcels with a value, half lie between 1.6 and 2.8. The median is 2.1 and the mean 2.3.
Share of parcels by range
- below 222 %
- 2 to below 345 %
- 3 to below 529 %
- 5 and above5 %
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 | 1’329 | 82 % |
| Last 60 years | 711 | 104 % |
| Last 40 years | 544 | 107 % |
| Last 20 years | 255 | 107 % |
| Last 15 years | 181 | 111 % |
| Last 10 years | 112 | 119 % |
| Last 5 years | 55 | 118 % |
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).