Calculate the floor area number (GRZ) yourself
What is meant by a floor area number?
The floor area number, also known as GRZ for short, is the part of the area of a property that can be built on. The base area number is usually given with one or two decimal places.
If a seller a Property If you want to sell, you should definitely know the GRZ. The higher the floor area number, the higher the seller can specify the purchase price of the property, because the higher the GRZ, the larger the living and usable space can be.
How is the GRZ calculated?
For example, if you assume a property area of 500 square meters and a GRZ of usually 0.4, the floor area number is as follows:
Here you calculate the 500 sqm property area x 0.4 floor area number and the result is 200 sqm floor area.
This means that of the entire 500 sqm property, only 200 sqm can be built on and 300 sqm is open space or Green space must remain.
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The 200 sqm floor area does not always mean that 200 sqm is also living and usable space.
Nowadays you usually no longer have to go to the trouble of calculating the GRZ yourself. You can often get this via the city's development plan, in the purchase contract, or by entering it in the Land register or by looking at the property cadastre.
Which areas are included in the GRZ?
The floor area number includes all construction work on a property that seals or covers the ground. This includes, for example, the house itself with the outer walls, terraces or garages. This also includes parking spaces or access routes.
If you want to purchase a property, you can usually find the GRZ in the city's development plans. The number is given there so that the green area and the built-up area are in balance. Among other things, the GRZ should regulate the distance to neighbors and ensure that there is enough green space for infiltration of rainwater is present and ecological aspects in terms of nature and species protection are taken into account.
Another reason why the GRZ is governed by legal regulations is the beautification of the cityscape. Many residential areas are characterized by the fact that the individual properties have large front gardens, which allow plenty of light and air between the residential buildings. A usual value for a residential area with sufficient space to the nearest neighbor and a lot of green space is a GRZ of 0.2.
A floor area number of 1.0 means that the entire property area can be built on. However, this is rarely the case.
In order to get to the GRZ, you no longer need to do your own calculation. The buyer receives this information or Seller from the purchase contract or by looking at the land register. The higher the GRZ, the larger the area of the property that can be built on, which has a positive impact on the sales price. However, each municipality has its own regulations that influence the amount of the GRZ.
If you want to buy or sell a property, you should definitely know the value of the floor area.
