Birrwil: observed built density
Municipality in the canton of Aargau · FSO no. 4132 · Parcel data as of July 2025
- Parcels
- 1’282
< 1 % of the canton
- Municipal zones
- 20
- Median utilization
- 7 %
Canton: 35 %
Switzerland: 10 %
- Median GFZ
- 0.07
Canton: 0.13
Switzerland: 0.09
- Median height
- 9.9 m
Canton: 9.3 m
Switzerland: 9.5 m
- Median floors
- 2.3
Canton: 2.2
Switzerland: 2.3
About Birrwil
Birrwil is a municipality in the canton of Aargau. The parcel data lists 1’282 parcels in 20 municipal zone types. The zone types with the most parcels are Landwirtschaftszone (421), Perimeter des Hallwilersee-Schutzdekretes (238) and Wald (203).
The median parcel is built to a volume utilization of 7 %; half of the parcels lie between 4 % and 48 %. The canton median is 35 %, so Birrwil sits below it.
The median building height is 9.9 m at 2.3 floors, and the median floor-area ratio (GFZ) is 0.07. Parcels built in the last 20 years reach a mean volume utilization of 122 % (88 parcels), higher than the 40 % across all building years.
Parcels by municipal zone
| Zone | Parcels | Median utilization |
|---|---|---|
| Landwirtschaftszone | 421 | 0 % |
| Perimeter des Hallwilersee-Schutzdekretes | 238 | 0 % |
| Wald | 203 | 0 % |
| Ein- und Zweifamilienhauszone | 151 | 91 % |
| Wohn- und Gewerbezone 2 Geschosse | 70 | 82 % |
| Wohnzone 2 Geschosse | 67 | 61 % |
| Wohnzone 3 Geschosse | 42 | 71 % |
| Kernzone | 18 | 42 % |
| Dorfzone | 15 | 72 % |
| Kantonsstrasse | 12 | 0 % |
| Magere Fettwiese | 10 | 0 % |
| Spezialzone Färbi | 10 | 14 % |
| Other zones (8) | 25 | - |
Volume utilization (ratioV)
Of the 1’266 parcels with a value, half lie between 4 % and 48 %. The median is 7 % and the mean 35 %.
Share of parcels by range
- below 50 %75 %
- 50 % to below 100 %10 %
- 100 % to below 150 %8 %
- 150 % and above6 %
Floor-area ratio (GFZ)
Of the 1’265 parcels with a value, half lie between 0.03 and 0.23. The median is 0.07 and the mean 0.15.
Share of parcels by range
- below 0.5088 %
- 0.50 to below 1.0010 %
- 1.00 to below 1.502 %
- 1.50 and above< 1 %
Building height
Of the 383 parcels with a value, half lie between 8.2 m and 11.7 m. The median is 9.9 m and the mean 9.9 m.
Share of parcels by range
- below 8 m22 %
- 8 m to below 12 m57 %
- 12 m to below 20 m21 %
- 20 m and above0 %
Number of floors
Of the 289 parcels with a value, half lie between 1.8 and 2.9. The median is 2.3 and the mean 2.4.
Share of parcels by range
- below 29 %
- 2 to below 352 %
- 3 to below 537 %
- 5 and above2 %
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 | 1’282 | 40 % |
| Last 60 years | 251 | 116 % |
| Last 40 years | 157 | 118 % |
| Last 20 years | 88 | 122 % |
| Last 15 years | 69 | 128 % |
| Last 10 years | 30 | 119 % |
| Last 5 years | 13 | 133 % |
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).