Therwil: observed built density
Municipality in the canton of Basel-Landschaft · FSO no. 2775 · Parcel data as of July 2025
- Parcels
- 4’030
3 % of the canton
- Municipal zones
- 40
- Median utilization
- 57 %
Canton: 41 %
Switzerland: 10 %
- Median GFZ
- 0.43
Canton: 0.22
Switzerland: 0.09
- Median height
- 8.8 m
Canton: 9.6 m
Switzerland: 9.5 m
- Median floors
- 2.1
Canton: 2.1
Switzerland: 2.3
About Therwil
Therwil is a municipality in the canton of Basel-Landschaft. The parcel data lists 4’030 parcels in 40 municipal zone types. The zone types with the most parcels are W2 (1’331), W1 (793) and Landwirtschaftszone (460).
The median parcel is built to a volume utilization of 57 %; half of the parcels lie between 7 % and 90 %. The canton median is 41 %, so Therwil sits above it.
The median building height is 8.8 m at 2.1 floors, and the median floor-area ratio (GFZ) is 0.43. Parcels built in the last 20 years reach a mean volume utilization of 104 % (256 parcels), higher than the 55 % across all building years.
Parcels by municipal zone
| Zone | Parcels | Median utilization |
|---|---|---|
| W2 | 1’331 | 69 % |
| W1 | 793 | 80 % |
| Landwirtschaftszone | 460 | 0 % |
| WG2 | 274 | 67 % |
| Wald | 231 | 0 % |
| Strasse innerhalb ZPS | 201 | 0 % |
| Wohnzonen | 192 | 95 % |
| Strasse ausserhalb ZPS | 145 | 0 % |
| Kernzone | 71 | 76 % |
| W2a | 37 | 82 % |
| Zone für öffentliche Werke und Anlagen | 36 | 17 % |
| 2. Ausbauetappe | 34 | 0 % |
| Other zones (28) | 225 | - |
Volume utilization (ratioV)
Of the 3’979 parcels with a value, half lie between 7 % and 90 %. The median is 57 % and the mean 53 %.
Share of parcels by range
- below 50 %46 %
- 50 % to below 100 %37 %
- 100 % to below 150 %15 %
- 150 % and above3 %
Floor-area ratio (GFZ)
Of the 3’978 parcels with a value, half lie between 0.07 and 0.72. The median is 0.43 and the mean 0.43.
Share of parcels by range
- below 0.5056 %
- 0.50 to below 1.0035 %
- 1.00 to below 1.508 %
- 1.50 and above1 %
Building height
Of the 2’451 parcels with a value, half lie between 6.9 m and 10.4 m. The median is 8.8 m and the mean 8.5 m.
Share of parcels by range
- below 8 m37 %
- 8 m to below 12 m57 %
- 12 m to below 20 m5 %
- 20 m and above< 1 %
Number of floors
Of the 2’386 parcels with a value, half lie between 1.5 and 2.8. The median is 2.1 and the mean 2.2.
Share of parcels by range
- below 223 %
- 2 to below 342 %
- 3 to below 534 %
- 5 and above1 %
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 | 4’030 | 55 % |
| Last 60 years | 1’927 | 86 % |
| Last 40 years | 1’047 | 91 % |
| Last 20 years | 256 | 104 % |
| Last 15 years | 157 | 106 % |
| Last 10 years | 81 | 103 % |
| Last 5 years | 32 | 110 % |
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).