Illnau-Effretikon: observed built density
Municipality in the canton of Zurich · FSO no. 296 · Parcel data as of July 2025
- Parcels
- 5’623
1 % of the canton
- Municipal zones
- 30
- Median utilization
- 10 %
Canton: 40 %
Switzerland: 10 %
- Median GFZ
- 0.09
Canton: 0.22
Switzerland: 0.09
- Median height
- 10.3 m
Canton: 10.5 m
Switzerland: 9.5 m
- Median floors
- 2.5
Canton: 2.8
Switzerland: 2.3
About Illnau-Effretikon
Illnau-Effretikon is a municipality in the canton of Zurich. The parcel data lists 5’623 parcels in 30 municipal zone types. The zone types with the most parcels are Kantonale Landwirtschaftszone (1’565), Wohnzone 1.7 (744) and Wald (663).
The median parcel is built to a volume utilization of 10 %; half of the parcels lie between 5 % and 86 %. The canton median is 40 %, so Illnau-Effretikon sits below it.
The median building height is 10.3 m at 2.5 floors, and the median floor-area ratio (GFZ) is 0.09. Parcels built in the last 20 years reach a mean volume utilization of 110 % (344 parcels), higher than the 78 % across all building years.
Parcels by municipal zone
| Zone | Parcels | Median utilization |
|---|---|---|
| Kantonale Landwirtschaftszone | 1’565 | 0 % |
| Wohnzone 1.7 | 744 | 77 % |
| Wald | 663 | 0 % |
| Kernzone II | 524 | 71 % |
| Kernzone I | 399 | 87 % |
| Wohnzone 1.3 | 382 | 73 % |
| Wohnzone 2.2 | 243 | 64 % |
| Wohnzone 2.6 | 223 | 79 % |
| Wohnzone 3.0 | 85 | 88 % |
| Wohnzone G 3.2 | 81 | 52 % |
| Zentrumszone 4.0 | 78 | 32 % |
| Freihaltezone | 76 | 0 % |
| Other zones (18) | 560 | - |
Volume utilization (ratioV)
Of the 5’577 parcels with a value, half lie between 5 % and 86 %. The median is 10 % and the mean 59 %.
Share of parcels by range
- below 50 %59 %
- 50 % to below 100 %22 %
- 100 % to below 150 %12 %
- 150 % and above8 %
Floor-area ratio (GFZ)
Of the 5’577 parcels with a value, half lie between 0.05 and 0.58. The median is 0.09 and the mean 0.33.
Share of parcels by range
- below 0.5071 %
- 0.50 to below 1.0020 %
- 1.00 to below 1.507 %
- 1.50 and above2 %
Building height
Of the 2’701 parcels with a value, half lie between 8.5 m and 12.1 m. The median is 10.3 m and the mean 10.4 m.
Share of parcels by range
- below 8 m18 %
- 8 m to below 12 m56 %
- 12 m to below 20 m24 %
- 20 m and above1 %
Number of floors
Of the 2’077 parcels with a value, half lie between 1.9 and 3.2. The median is 2.5 and the mean 2.6.
Share of parcels by range
- below 28 %
- 2 to below 343 %
- 3 to below 546 %
- 5 and above3 %
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 | 5’623 | 78 % |
| Last 60 years | 1’884 | 107 % |
| Last 40 years | 957 | 119 % |
| Last 20 years | 344 | 110 % |
| Last 15 years | 200 | 114 % |
| Last 10 years | 127 | 126 % |
| Last 5 years | 66 | 130 % |
Open the map at Illnau-Effretikon
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).