Buch am Irchel: observed built density
Municipality in the canton of Zurich · FSO no. 24 · Parcel data as of July 2025
- Parcels
- 1’195
< 1 % of the canton
- Municipal zones
- 8
- Median utilization
- 7 %
Canton: 40 %
Switzerland: 10 %
- Median GFZ
- 0.07
Canton: 0.22
Switzerland: 0.09
- Median height
- 10.9 m
Canton: 10.5 m
Switzerland: 9.5 m
- Median floors
- 2.3
Canton: 2.8
Switzerland: 2.3
About Buch am Irchel
Buch am Irchel is a municipality in the canton of Zurich. The parcel data lists 1’195 parcels in 8 municipal zone types. The zone types with the most parcels are Kantonale Landwirtschaftszone (552), Wald (262) and Kernzone I (172).
The median parcel is built to a volume utilization of 7 %; half of the parcels lie between 3 % and 44 %. The canton median is 40 %, so Buch am Irchel sits below it.
The median building height is 10.9 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 103 % (102 parcels), higher than the 38 % across all building years.
Parcels by municipal zone
| Zone | Parcels | Median utilization |
|---|---|---|
| Kantonale Landwirtschaftszone | 552 | 0 % |
| Wald | 262 | 0 % |
| Kernzone I | 172 | 60 % |
| Kernzone II | 101 | 90 % |
| Wohnzone 2 | 90 | 63 % |
| Gewässer | 11 | 0 % |
| Reservezone | 5 | 0 % |
| Zone für öffentliche Bauten | 2 | 50 % |
Volume utilization (ratioV)
Of the 1’184 parcels with a value, half lie between 3 % and 44 %. The median is 7 % and the mean 34 %.
Share of parcels by range
- below 50 %76 %
- 50 % to below 100 %11 %
- 100 % to below 150 %7 %
- 150 % and above6 %
Floor-area ratio (GFZ)
Of the 1’184 parcels with a value, half lie between 0.03 and 0.14. The median is 0.07 and the mean 0.17.
Share of parcels by range
- below 0.5085 %
- 0.50 to below 1.0010 %
- 1.00 to below 1.505 %
- 1.50 and above1 %
Building height
Of the 351 parcels with a value, half lie between 9.3 m and 12.3 m. The median is 10.9 m and the mean 10.7 m.
Share of parcels by range
- below 8 m13 %
- 8 m to below 12 m58 %
- 12 m to below 20 m29 %
- 20 m and above0 %
Number of floors
Of the 257 parcels with a value, half lie between 1.8 and 2.9. The median is 2.3 and the mean 2.3.
Share of parcels by range
- below 29 %
- 2 to below 350 %
- 3 to below 540 %
- 5 and above0 %
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 | 1’195 | 38 % |
| Last 60 years | 257 | 117 % |
| Last 40 years | 221 | 126 % |
| Last 20 years | 102 | 103 % |
| Last 15 years | 62 | 90 % |
| Last 10 years | 39 | 96 % |
| Last 5 years | 14 | 103 % |
Open the map at Buch am Irchel
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).