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What is meant by Wohnflächenberechnung (calculation of living space)?
Wohnflächenberechnung refers to the legally defined method used to measure and determine the usable living area of a flat, which then serves as the basis for calculating rent and operating costs.
This calculation is regulated by the Living Space Ordinance (Wohnflächenverordnung – WoFlV), in force since 2004, which precisely defines what is and is not included in the legally relevant living area.
What is included in the flat’s living area?
Typically, the following areas are fully counted as living space:
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Bedrooms and living rooms
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Kitchen and bathroom
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Hallways and corridors inside the flat
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Internal storage rooms within the flat
What is not included in the living area?
The following areas do not count as living space under the WoFlV:
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Cellars (Keller)
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Shared laundry rooms
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Boiler rooms / heating and technical rooms
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Parking spaces and garages (including underground garages)
How are balconies and terraces treated?
Balconies, loggias and terraces are not counted at 100 %, but usually only partially:
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As a rule, they are counted at 25 % of their actual surface area
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For particularly high-quality, well-equipped and fully usable outdoor spaces, up to 50 % may be taken into account
Example:
If a balcony has 10 m², it may only be counted as 2.5 to 5 m² in the legal living area, depending on its quality.
Sloping ceilings and low ceiling heights
Special rules apply to rooms with sloping ceilings or low heights:
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Below 1 metre height: the area is not counted as living space
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Between 1 and 2 metres height: the area counts at 50 %
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Above 2 metres height: the area counts at 100 %
Why is accurate Wohnflächenberechnung important?
Accurate calculation of living space is crucial:
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to determine a fair and appropriate rent
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to calculate operating costs (service charges) correctly
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for applications for housing benefits (Wohngeld) or other subsidies
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to avoid legal disputes about the floor area stated in the tenancy agreement
What are the risks if the living area is incorrect?
If it turns out that the actual living space is more than 10 % smaller than the size stated in the tenancy agreement, the tenant is generally entitled to:
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demand a reduction of the basic rent
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claim retroactive repayment of the overpaid rent for the past period
Practical tips for tenants
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Ask for a floor plan (Grundriss) and check the dimensions before signing the contract.
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Pay attention to how the balcony, terrace and sloping areas were calculated.
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If you have doubts, consult an independent expert or surveyor.
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Keep all documents related to the calculation of living space, including floor plans and written correspondence.
Practical tips for landlords
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Always calculate living space in line with the WoFlV to avoid disputes later on.
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Provide a clear and precise description of the living area in the tenancy agreement.
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Keep measurement records, plans and floor drawings as evidence of your figures.
Conclusion
The calculation of living space (Wohnflächenberechnung) is extremely important for both tenants and landlords in Germany. A correct and transparent measurement ensures fair rent, accurate service charge calculations, and helps to avoid costly legal conflicts. By following the legal rules of the WoFlV and documenting measurements carefully, both sides can build a fair and transparent tenancy relationship.
The editorial and author team of the website strives to provide accurate information based on thorough research and multiple reliable sources. However, errors may occur or certain details may not be fully verified. Therefore, the information in this article should be regarded as an initial point of reference, and you should always contact the competent authorities or professionals for binding and up-to-date advice.
