Trélex: observed built density
Municipality in the canton of Vaud · FSO no. 5730 · Parcel data as of July 2025
- Parcels
- 776
< 1 % of the canton
- Municipal zones
- 14
- Median utilization
- 21 %
Canton: 9 %
Switzerland: 10 %
- Median GFZ
- 0.09
Canton: 0.09
Switzerland: 0.09
- Median height
- -
Canton: -
Switzerland: 9.5 m
- Median floors
- 2.3
Canton: 2.4
Switzerland: 2.3
About Trélex
Trélex is a municipality in the canton of Vaud. The parcel data lists 776 parcels in 14 municipal zone types. The zone types with the most parcels are Zone d'habitation de très faible densité 15 LAT (290), Zone agricole 16 LAT (173) and Zone centrale 15 LAT (96).
The median parcel is built to a volume utilization of 21 %; half of the parcels lie between 5 % and 84 %. The canton median is 9 %, so Trélex sits above it.
Parcels built in the last 20 years reach a mean volume utilization of 106 % (64 parcels), higher than the 56 % across all building years.
Parcels by municipal zone
| Zone | Parcels | Median utilization |
|---|---|---|
| Zone d'habitation de très faible densité 15 LAT | 290 | 68 % |
| Zone agricole 16 LAT | 173 | 0 % |
| Zone centrale 15 LAT | 96 | 103 % |
| Aire forestière 18 LAT | 53 | 0 % |
| Zone agricole protégée 16 LAT | 52 | 0 % |
| Zone de desserte 15 LAT | 47 | 0 % |
| Zone intermédiaire 18 LAT | 19 | 0 % |
| Zone de verdure 15 LAT | 14 | 6 % |
| Zone viticole 16 LAT | 13 | 0 % |
| Zone affectée à des besoins publics 15 LAT | 6 | 21 % |
| Zone d'activités économiques 15 LAT | 5 | 69 % |
| Zone des eaux 17 LAT | 3 | 0 % |
| Other zones (2) | 5 | - |
Volume utilization (ratioV)
Of the 762 parcels with a value, half lie between 5 % and 84 %. The median is 21 % and the mean 51 %.
Share of parcels by range
- below 50 %57 %
- 50 % to below 100 %25 %
- 100 % to below 150 %13 %
- 150 % and above6 %
Floor-area ratio (GFZ)
Of the 762 parcels with a value, half lie between 0.05 and 0.27. The median is 0.09 and the mean 0.18.
Share of parcels by range
- below 0.5093 %
- 0.50 to below 1.004 %
- 1.00 to below 1.502 %
- 1.50 and above1 %
Building height
The parcel data has too few values for this measure here.
Number of floors
Of the 279 parcels with a value, half lie between 1.8 and 2.8. The median is 2.3 and the mean 2.3.
Share of parcels by range
- below 29 %
- 2 to below 354 %
- 3 to below 537 %
- 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 | 776 | 56 % |
| Last 60 years | 306 | 88 % |
| Last 40 years | 187 | 97 % |
| Last 20 years | 64 | 106 % |
| Last 15 years | 37 | 109 % |
| Last 10 years | 23 | 115 % |
| Last 5 years | 14 | 113 % |
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).