Did you know that two homes with the same square meters can offer very different living spaces? The key is understanding the difference between built and usable square meters. In this guide, we explain how to calculate them, what each includes, and how to use this information to make better decisions when buying or renting a home.
What are built square meters?
Built square meters represent the total surface area of a property, including all areas—both livable and structural or shared.
They are calculated by adding:
- Interior spaces: bedrooms, kitchen, bathrooms, hallways, etc.
- Structural elements: walls, partitions, pillars, and load-bearing walls.
- Common areas: in apartment buildings, a proportional share of entrances, staircases, elevators, and shared corridors is included.
In short, built square meters show the total size of the property, both private and shared, and are usually the figure that appears in deeds or real estate listings.
What are usable square meters?
Usable square meters are the space inside your home that you can actually use and enjoy every day. In other words, the areas where you can place furniture, move around, and carry out your daily activities.
They include:
- Living room and bedrooms
- Kitchen and bathrooms
- Built-in wardrobes and dressing rooms
- Hallways and internal distribution areas
- Covered terraces (if integrated into the home)
In short, usable square meters reflect real life inside your home—the space you truly enjoy every day. That’s why, even if two apartments have the same built area, the one with more usable space will feel more spacious.
How to find out each measurement
Knowing how many square meters your home has—both built and usable—is essential to properly assess its value and functionality.
For usable square meters:
- Check the property floor plans: they usually include the area of each room.
- Measure directly with a tape measure or laser meter: add the surface area of all rooms, kitchen, bathrooms, hallways, and wardrobes.
- Exclude walls and pillars, as they do not count as usable space.
For built square meters:
- Check the property deed or land registry: built area is usually listed there.
- Review the cadastral record or technical plans: they include the whole home plus the proportional share of common areas.
Having both figures allows you to compare properties fairly and understand the space you’ll actually be able to use.
How much can the percentage differ between built and usable space?
There is no fixed percentage, as it depends on the type of construction and building design. However, generally:
- In detached houses, the difference is around 10%–15%.
- In apartments with many common areas, it can reach up to 25%.
For example, a home with 100 m² built could have only 75–90 m² usable. This difference can determine how many pieces of furniture fit, how spaces are distributed, and even how spacious the home feels.
How terraces are calculated
Terraces are counted differently depending on whether they are covered or uncovered:
- Covered terrace: 100% of its surface counts as usable and 50% as built. This means that although it contributes partially to the built area, you can fully use the space.
- Uncovered terrace: not included in the built area, but added to usable square meters.
This detail is especially important if you value outdoor spaces. A covered terrace can significantly increase living space, while an uncovered one adds comfort without increasing official built square meters.
Practical tips for buyers and tenants
When buying or renting a home, square meter information can make the difference between a good and a bad decision.
- Always ask for both figures: built and usable. Don’t rely only on the size shown in the listing.
- Review floor plans to visualize the real layout and usable space.
- Consider outdoor areas: covered or uncovered terraces affect usable space and your perception of spaciousness.
- Compare homes by usable square meters: two properties with the same built area may offer very different living spaces.
- Plan furniture layout using usable space to ensure everything fits.
- Take common areas into account: in buildings with many shared spaces, the difference can be greater.
- Ask about local regulations: some regions have different rules for calculating square meters.
Make the most of your home’s space
Understanding the difference between built and usable square meters is essential for making informed decisions when buying a home. While built space shows the total property size, usable space reflects the area you will truly enjoy and live in. Reviewing plans, measuring properly, and considering terraces and common areas will help you make the most of every square meter of your home.
Frequently Asked Questions (FAQs)
1. Why are usable square meters smaller than built ones?
Because built square meters include walls, pillars, and common areas, while usable square meters only include livable areas.
2. Where can I find the built square meters of my home?
In the property deed, the land registry extract, or the cadastral record.
3. Do balconies count as usable square meters?
It depends. If they are covered and integrated, yes. If they are open, they are calculated separately.
4. Why do real estate listings usually show only built square meters?
Because it is the official registered measurement, although it does not always represent the real living space.
