Usable or built-up area: converter
Convertește instant suprafața utilă în construită și invers și află prețul corect pe mp util, ca să compari corect apartamentele dincolo de cifrele din anunț.
Free result
Area conversion and indicative price per usable m².
The basis, rechecking and limitations of the calculation
- Rule or data
- Geometric conversion using the coefficient selected by the user.
- When we check again
- Always confirm the area in the property documents.
- What may vary
- The actual coefficient varies with the building's walls and common areas.
The area you have is
Typically 1.15-1.20 (the difference comes from walls and shares of common areas). The exact value is in the flat's measured floor plan / land register.
Usable vs built-up: what they mean
Usable area is the space inside a home that can actually be used, measured between the walls. Built-up area adds the walls and shares of common areas (stairwell, lift, external walls), so it is larger. The typical built-up/usable ratio is between 1.15 and 1.20, but it varies between buildings.
Why the price per usable m² matters
Listings often give the price per built-up m², which looks lower. To compare two flats accurately, calculate the price per usable m²: total price divided by usable area. For the property's official value (the starting basis for notarial fees), use the notarial valuation grid.
Frequently asked questions
What is the difference between usable area and built-up area?
Usable area is the space inside a home that can actually be used (rooms, bathrooms, kitchen, hallway), measured between the walls. Built-up area also includes the walls and shares of common areas (stairwell, lift, external walls). This is why built-up area is larger than usable area.
How do I convert usable area to built-up area?
Multiply the usable area by a built-up/usable ratio, typically between 1.15 and 1.20. For example, 60 usable m² × 1.2 = 72 built-up m². To convert the other way, divide the built-up area by the same ratio.
Which ratio (coefficient) should I use?
On average, 1.15-1.20 for flats. The difference comes from wall thickness and shares of common areas, so it varies between buildings. The exact value appears in the flat's measured floor plan and the land register.
Why does the price per usable m² matter?
Listings often quote the price per built-up m², which looks lower. To compare two flats accurately, calculate the price per usable m²: total price divided by usable area. This shows how much you pay for the space you actually use.
Where can I find the flat's exact area?
In the title deed, land register extract and cadastral floor plan. These specify the usable area (and sometimes the built-up area). Do not rely solely on the area in the listing.
Check the actual area in the documents
The area in the listing does not always match the documents. The exact area appears in the land register extract and cadastral floor plan. Order a land register extract.