Collex-Bossy: observed built density
Municipality in the canton of Geneva · FSO no. 6615 · Parcel data as of July 2025
- Parcels
- 733
1 % of the canton
- Municipal zones
- 5
- Median utilization
- 21 %
Canton: 49 %
Switzerland: 10 %
- Median GFZ
- 0.09
Canton: 0.23
Switzerland: 0.09
- Median height
- 8.8 m
Canton: 9.3 m
Switzerland: 9.5 m
- Median floors
- 2.2
Canton: 2.4
Switzerland: 2.3
About Collex-Bossy
Collex-Bossy is a municipality in the canton of Geneva. The parcel data lists 733 parcels in 5 municipal zone types. The zone types with the most parcels are Zone agricole (284), Zone de développement 4B protégée (267) and Zone des bois et forêts (89).
The median parcel is built to a volume utilization of 21 %; half of the parcels lie between 5 % and 108 %. The canton median is 49 %, so Collex-Bossy sits below it.
The median building height is 8.8 m at 2.2 floors, and the median floor-area ratio (GFZ) is 0.09. Parcels built in the last 20 years reach a mean volume utilization of 123 % (77 parcels), higher than the 82 % across all building years.
Parcels by municipal zone
| Zone | Parcels | Median utilization |
|---|---|---|
| Zone agricole | 284 | 0 % |
| Zone de développement 4B protégée | 267 | 95 % |
| Zone des bois et forêts | 89 | 0 % |
| Zone de développement 5 | 88 | 80 % |
| Zone de verdure | 5 | 0 % |
Volume utilization (ratioV)
Of the 726 parcels with a value, half lie between 5 % and 108 %. The median is 21 % and the mean 76 %.
Share of parcels by range
- below 50 %56 %
- 50 % to below 100 %18 %
- 100 % to below 150 %11 %
- 150 % and above16 %
Floor-area ratio (GFZ)
Of the 726 parcels with a value, half lie between 0.05 and 0.44. The median is 0.09 and the mean 0.33.
Share of parcels by range
- below 0.5079 %
- 0.50 to below 1.0012 %
- 1.00 to below 1.504 %
- 1.50 and above6 %
Building height
Of the 389 parcels with a value, half lie between 7.2 m and 10.0 m. The median is 8.8 m and the mean 8.7 m.
Share of parcels by range
- below 8 m33 %
- 8 m to below 12 m60 %
- 12 m to below 20 m6 %
- 20 m and above< 1 %
Number of floors
Of the 301 parcels with a value, half lie between 1.6 and 2.9. The median is 2.2 and the mean 2.2.
Share of parcels by range
- below 219 %
- 2 to below 342 %
- 3 to below 539 %
- 5 and above0 %
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 | 733 | 82 % |
| Last 60 years | 283 | 118 % |
| Last 40 years | 197 | 126 % |
| Last 20 years | 77 | 123 % |
| Last 15 years | 52 | 117 % |
| Last 10 years | 36 | 125 % |
| Last 5 years | 14 | 165 % |
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).