Affoltern am Albis: observed built density
Municipality in the canton of Zurich · FSO no. 2 · Parcel data as of July 2025
- Parcels
- 2’966
1 % of the canton
- Municipal zones
- 20
- Median utilization
- 49 %
Canton: 40 %
Switzerland: 10 %
- Median GFZ
- 0.38
Canton: 0.22
Switzerland: 0.09
- Median height
- 10.5 m
Canton: 10.5 m
Switzerland: 9.5 m
- Median floors
- 2.7
Canton: 2.8
Switzerland: 2.3
About Affoltern am Albis
Affoltern am Albis is a municipality in the canton of Zurich. The parcel data lists 2’966 parcels in 20 municipal zone types. The zone types with the most parcels are Dreigeschossige Wohnzone (737), Kantonale Landwirtschaftszone (381) and Zweigeschossige Wohnzone (248).
The median parcel is built to a volume utilization of 49 %; half of the parcels lie between 6 % and 91 %. The canton median is 40 %, so Affoltern am Albis sits above it.
The median building height is 10.5 m at 2.7 floors, and the median floor-area ratio (GFZ) is 0.38. Parcels built in the last 20 years reach a mean volume utilization of 107 % (246 parcels), higher than the 59 % across all building years.
Parcels by municipal zone
| Zone | Parcels | Median utilization |
|---|---|---|
| Dreigeschossige Wohnzone | 737 | 71 % |
| Kantonale Landwirtschaftszone | 381 | 0 % |
| Zweigeschossige Wohnzone | 248 | 54 % |
| Viergeschossige Wohnzone | 200 | 72 % |
| Dreigeschossige Wohnzone mit Gewerbeerleichterung | 195 | 68 % |
| Wald | 194 | 0 % |
| Kernzone | 177 | 97 % |
| Viergeschossige Wohnzone mit Gewerbeerleichterung | 163 | 66 % |
| Fünfgeschossige Zentrumszone | 159 | 53 % |
| Fünfgeschossige Wohnzone | 126 | 40 % |
| Industriezone | 85 | 15 % |
| Viergeschossige Zentrumszone | 79 | 64 % |
| Other zones (8) | 222 | - |
Volume utilization (ratioV)
Of the 2’944 parcels with a value, half lie between 6 % and 91 %. The median is 49 % and the mean 57 %.
Share of parcels by range
- below 50 %51 %
- 50 % to below 100 %29 %
- 100 % to below 150 %14 %
- 150 % and above7 %
Floor-area ratio (GFZ)
Of the 2’944 parcels with a value, half lie between 0.06 and 0.77. The median is 0.38 and the mean 0.46.
Share of parcels by range
- below 0.5059 %
- 0.50 to below 1.0027 %
- 1.00 to below 1.5011 %
- 1.50 and above4 %
Building height
Of the 1’802 parcels with a value, half lie between 8.6 m and 12.5 m. The median is 10.5 m and the mean 10.6 m.
Share of parcels by range
- below 8 m17 %
- 8 m to below 12 m54 %
- 12 m to below 20 m29 %
- 20 m and above1 %
Number of floors
Of the 1’453 parcels with a value, half lie between 2.1 and 3.3. The median is 2.7 and the mean 2.7.
Share of parcels by range
- below 24 %
- 2 to below 338 %
- 3 to below 554 %
- 5 and above4 %
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 | 2’966 | 59 % |
| Last 60 years | 1’300 | 94 % |
| Last 40 years | 841 | 98 % |
| Last 20 years | 246 | 107 % |
| Last 15 years | 166 | 111 % |
| Last 10 years | 93 | 117 % |
| Last 5 years | 42 | 121 % |
Open the map at Affoltern am Albis
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).