What are geometric coefficients, how are they calculated, and what are they used for?
What are geometric coefficients?
Geometric coefficients (also known as evaluation figures) are quantitative specifications for building elements. They describe the size or number of an evaluated component.
Examples:
Facade area (FF): 850 m²
Building footprint (GRG): 420 m²
Number of residential units (AW): 12
Living area (FW): 950 m²
Lot area (LA): 1,500 m²
Number of stairwells × residential floors (ATE): 3 × 4 = 12
These values are multiplied by the diagnostic points to calculate the repair costs in €.
Why are they needed?
The condition assessment alone is not sufficient. The size or quantity of the element must be taken into account.
Example:
Building A:
Code c → 58 points
Facade area: 200 m²
Cost: €75,000
Building B:
Code c → 58 points
Facade area: 1,000 m²
Cost: €375,000
Same condition, but different size → different costs.
Data collection on the building
Geometric coefficients are recorded on the building as evaluation figures/KPIs.
Important: The link to diagnostic elements is established automatically. You only need to enter the values.
Procedure: Manual creation
Open the building diagnosis
Use the "Add Key Figures" action in the Tools menu. Missing geometric coefficients for the building are created.
Use the "Check Key Figures" information area to add missing values.
If a value is missing, e.g., residential units, enter 0.
Important: All coefficients must be fully entered for the calculation to work correctly.
Where can I find the values?
eTASK forms
Architectural plans
Building documentation
On-site data collection
Typical calculations
Building floor area (BFA)
Gross floor area of the ground floor
Portfolio (BIM) - Property Cadastre - Floors
Note: GRG is independent of the number of floors.
Stairwells × Residential Floors (ATE)
Portfolio (BIM) - Property cadastre - Rooms
Number of rooms on a floor with usage type 9.3
Number of floors with rooms of usage types 1.*
ATE = Rooms × Floors
Update
Update values for:
After renovations:
Facade expansion (extension)
Roof shape changes
After renovations:
Changes in usable floor area
New rooms
If errors are found:
Original values were incorrect
New documents available
Important: Enter the new value with the current date; DO NOT overwrite the old value! The system automatically uses the latest value.
Summary
Geometric coefficients:
Are quantitative data (areas, quantities)
Are recorded on the building as KPIs
Multiplied by diagnostic points → Costs in €