Development rate - how much land is sealed by a building
What is the construction rate?
Die Construction rate (UEZ) Is an important indicator in spatial planning and determines how much of the eligible land area (AgSF) may be built on a plot of land. In contrast to the previous Utilization rate (AZ), which focused on construction volume, the UEZ explicitly describes the “Footprint” Of a building as a percentage and determines how large the proportion of construction area may be in relation to the total area. It therefore defines how much land on a plot of land may be sealed by the building. This helps cities to promote sustainable, space-saving use and thus relieve the burden on the environment and infrastructure. Die eligible building area (AgBF) comprises all structural elements that overhang the site, such as building areas, extensions and certain balconies.
Calculate the construction figure
The UEZ is calculated using the formula:
Development rate = eligible building area (AgBF) /eligible land area (AgSF)
Exemple: If the AgSF 800 m² and a UEZ of 0.25 or 25% are allowed, this means that the AgBF may be 200 m². This is the area that can be used for the building.
Differences from the Utilization Rate (AZ)
The construction rate (UEZ) replaces the previous one in many regions Utilization rate (AZ), which primarily regulated construction volume and building density. The Switch to UEZ was necessary to establish more flexible and precise control methods for spatial and district planning. Building height is now another decisive factor for evaluating the building density of an area, which gives municipalities the opportunity to determine density and height in line with their development goals.
Areas of Application and Influencing Factors
The UEZ is particularly used in the planning of urban districts and influences various aspects of spatial planning, including:
- Density and living space design: It promotes efficient use of construction space and provides clear guidelines for the area that may be built over. This does not create any false incentives that can arise if only certain areas are counted for use.
- Integration of green spaces and infrastructure: The UEZ supports sustainable land planning and makes it possible to reserve public space for green spaces or paths.
- Growth and social development: In Light of Population Growth and the Increase in Density in Urban Habitats, UEZ is an Approach to Regulate Sealed Soil Area.
Construction rate in the context of spatial planning
The Determination and Enforcement of the Development Rate is part of the Municipal and Cantonal Building and Zoning Regulations, with Municipalities Applying the Admissible UEZ depending on Zone type Set individually. Due to this locally specific interpretation, it is not possible to directly convert existing utilization figures to superstructure figures.
In the Canton of Zurich, the following municipalities use the UEZ (as of 2020):
- Adlikon
- Buchs
- Herrliberg
- Hochfelden
- Kappel am Albis
- Kleinandelfingen
- miles
- Neftenbach
- Oetwil an der Limmat
- Russikon
- Weisslingen
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