Birr: observed built density
Municipality in the canton of Aargau · FSO no. 4092 · Parcel data as of July 2025
- Parcels
- 1’146
< 1 % of the canton
- Municipal zones
- 21
- Median utilization
- 78 %
Canton: 35 %
Switzerland: 10 %
- Median GFZ
- 0.40
Canton: 0.13
Switzerland: 0.09
- Median height
- 9.1 m
Canton: 9.3 m
Switzerland: 9.5 m
- Median floors
- 2.2
Canton: 2.2
Switzerland: 2.3
About Birr
Birr is a municipality in the canton of Aargau. The parcel data lists 1’146 parcels in 21 municipal zone types. The zone types with the most parcels are Wohnzone 2 (527), Wohnzone 4 (164) and Landwirtschaftszone (105).
The median parcel is built to a volume utilization of 78 %; half of the parcels lie between 7 % and 109 %. The canton median is 35 %, so Birr sits above it.
The median building height is 9.1 m at 2.2 floors, and the median floor-area ratio (GFZ) is 0.40. Parcels built in the last 20 years reach a mean volume utilization of 111 % (208 parcels), higher than the 79 % across all building years.
Parcels by municipal zone
| Zone | Parcels | Median utilization |
|---|---|---|
| Wohnzone 2 | 527 | 93 % |
| Wohnzone 4 | 164 | 97 % |
| Landwirtschaftszone | 105 | 0 % |
| Dorfkernzone | 91 | 70 % |
| Wald | 61 | 0 % |
| Wohnzone 3 | 61 | 77 % |
| Arbeitszone II | 34 | 8 % |
| Spezialzone Bachtalen | 19 | 149 % |
| Arbeitszone I | 16 | 46 % |
| Zone für öffentliche Bauten und Anlagen | 14 | 0 % |
| Kantonsstrasse ausserhalb Bauzonen | 12 | 0 % |
| Kantonsstrasse innerhalb Bauzonen | 10 | 0 % |
| Other zones (9) | 32 | - |
Volume utilization (ratioV)
Of the 1’125 parcels with a value, half lie between 7 % and 109 %. The median is 78 % and the mean 74 %.
Share of parcels by range
- below 50 %38 %
- 50 % to below 100 %30 %
- 100 % to below 150 %22 %
- 150 % and above10 %
Floor-area ratio (GFZ)
Of the 1’124 parcels with a value, half lie between 0.07 and 0.60. The median is 0.40 and the mean 0.41.
Share of parcels by range
- below 0.5064 %
- 0.50 to below 1.0028 %
- 1.00 to below 1.507 %
- 1.50 and above1 %
Building height
Of the 715 parcels with a value, half lie between 7.1 m and 10.8 m. The median is 9.1 m and the mean 8.9 m.
Share of parcels by range
- below 8 m34 %
- 8 m to below 12 m57 %
- 12 m to below 20 m9 %
- 20 m and above< 1 %
Number of floors
Of the 604 parcels with a value, half lie between 1.7 and 2.9. The median is 2.2 and the mean 2.3.
Share of parcels by range
- below 213 %
- 2 to below 349 %
- 3 to below 536 %
- 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 | 1’146 | 79 % |
| Last 60 years | 651 | 116 % |
| Last 40 years | 479 | 115 % |
| Last 20 years | 208 | 111 % |
| Last 15 years | 133 | 114 % |
| Last 10 years | 84 | 120 % |
| Last 5 years | 40 | 96 % |
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).