Thônex: observed built density
Municipality in the canton of Geneva · FSO no. 6640 · Parcel data as of July 2025
- Parcels
- 2’512
3 % of the canton
- Municipal zones
- 10
- Median utilization
- 61 %
Canton: 49 %
Switzerland: 10 %
- Median GFZ
- 0.29
Canton: 0.23
Switzerland: 0.09
- Median height
- 7.9 m
Canton: 9.3 m
Switzerland: 9.5 m
- Median floors
- 2.1
Canton: 2.4
Switzerland: 2.3
About Thônex
Thônex is a municipality in the canton of Geneva. The parcel data lists 2’512 parcels in 10 municipal zone types. The zone types with the most parcels are Zone de développement 5 (1’834), Zone de développement 3 (401) and Zone agricole (122).
The median parcel is built to a volume utilization of 61 %; half of the parcels lie between 9 % and 99 %. The canton median is 49 %, so Thônex sits above it.
The median building height is 7.9 m at 2.1 floors, and the median floor-area ratio (GFZ) is 0.29. Parcels built in the last 20 years reach a mean volume utilization of 118 % (524 parcels), higher than the 99 % across all building years.
Parcels by municipal zone
| Zone | Parcels | Median utilization |
|---|---|---|
| Zone de développement 5 | 1’834 | 64 % |
| Zone de développement 3 | 401 | 43 % |
| Zone agricole | 122 | 0 % |
| Zone de développement 4B protégée | 104 | 64 % |
| Zone de développement industriel et artisanal | 29 | 23 % |
| Zone de verdure | 11 | 0 % |
| Zone ferroviaire | 4 | 23 % |
| Zone des bois et forêts | 3 | 0 % |
| Zone des eaux et des rives | 2 | 0 % |
| Zone sportive | 2 | 50 % |
Volume utilization (ratioV)
Of the 2’493 parcels with a value, half lie between 9 % and 99 %. The median is 61 % and the mean 88 %.
Share of parcels by range
- below 50 %40 %
- 50 % to below 100 %35 %
- 100 % to below 150 %11 %
- 150 % and above13 %
Floor-area ratio (GFZ)
Of the 2’493 parcels with a value, half lie between 0.08 and 0.49. The median is 0.29 and the mean 0.64.
Share of parcels by range
- below 0.5076 %
- 0.50 to below 1.0014 %
- 1.00 to below 1.503 %
- 1.50 and above8 %
Building height
Of the 1’759 parcels with a value, half lie between 6.7 m and 9.5 m. The median is 7.9 m and the mean 9.2 m.
Share of parcels by range
- below 8 m53 %
- 8 m to below 12 m35 %
- 12 m to below 20 m7 %
- 20 m and above6 %
Number of floors
Of the 1’434 parcels with a value, half lie between 1.6 and 2.9. The median is 2.1 and the mean 2.5.
Share of parcels by range
- below 221 %
- 2 to below 346 %
- 3 to below 524 %
- 5 and above10 %
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 | 2’512 | 99 % |
| Last 60 years | 1’391 | 116 % |
| Last 40 years | 996 | 107 % |
| Last 20 years | 524 | 118 % |
| Last 15 years | 359 | 126 % |
| Last 10 years | 278 | 136 % |
| Last 5 years | 112 | 155 % |
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).