Floor area is useful, but it is not the number you are actually paying for
When people start budgeting for renovation fleece or interior painting, they nearly always begin with the floor area of the property. That is understandable because it is the number they know from the sales brochure, the mortgage documents or the floor plan. The difficulty is that floor area and finishing area are not the same thing. You do not wallpaper the floor, and you do not paint only the outer shell of the house. Internal partitions, room layout, ceiling height and the number of openings all change the amount of work involved.
That is why a 115 m2 home does not equal 115 m2 of finishing. In reality, the surface to be prepared, wallpapered and painted is usually much larger.
Typical new-build sizes in the Dutch market
As a rough guide, new-build homes in the Netherlands often fall into the following ranges:
- Apartment: around 60 to 90 m2
- Terraced house: around 100 to 130 m2
- Corner house: around 110 to 140 m2
- Semi-detached house: around 130 to 160 m2
- Detached house: 150 m2 and above
These figures are useful for orientation, but they still do not tell you how much wall surface exists inside the home. Two homes with the same floor area can differ significantly in finishing work if one has more separate rooms, a higher stairwell or more internal partitions.
Turning floor area into wall area
In practice, a simple rule of thumb helps:
total wall surface to be finished = floor area × roughly 2.2 to 2.5
That multiplier depends on several factors:
- ceiling height
- the number of rooms
- whether the home has many internal walls
- the size of window openings and sliding doors
- whether there is a loft, stairwell or sloped roof
This is why a compact terraced home with several bedrooms can generate a surprisingly large amount of wall area, while a larger open-plan apartment with tall windows may produce slightly less.
A realistic example
Take a terraced new-build home of 115 m2. If the layout includes a living room, kitchen, hallway, three bedrooms, landing and attic, a practical early estimate might look like this:
- 115 m2 floor area × factor 2.4 = approximately 276 m2 of gross wall and ceiling surface
- less doors, windows and built-in elements = around 35 to 45 m2 deduction
- net surface to be finished = around 230 to 240 m2
That is usually a far better budgeting figure than the bare floor area, because it reflects the real amount of wall treatment involved.
Why larger windows do not automatically mean easier work
Modern new-build homes often have large sliding doors and wide window openings. That can reduce the amount of net wall surface, which seems beneficial from a cost perspective. But finishing work is not only about square metres. Narrow side strips, high reveals, corners around frames and changes in wall direction all take time. A property with fewer wall metres can still involve a lot of careful detail work.
The reverse is also true. A house with long, straight walls can sometimes be more efficient to finish per square metre than a smaller property with many awkward transitions.
What the area means for your budget
Once you have a realistic net wall estimate, pricing becomes much easier to understand. If a home comes out at approximately 230 m2 of wall surface, then indicative package costs start to make more sense. For example:
- at EUR 9 per m2, a basic renovation fleece package comes to about EUR 2,070 excluding VAT
- at EUR 13.50 per m2, a more complete package including painting reaches about EUR 3,105 excluding VAT
Those are still indicative, not final. Obstacles, room complexity, ceiling work, colour changes and the condition of the substrate all influence the total. But they put you in the right budget range much earlier.
Are ceilings included or not?
This is one of the most important questions when comparing quotes. Some homeowners assume the quoted area includes walls and ceilings together. Others assume it is walls only. In reality, it varies by contractor and by package. That is why every quote should make clear:
- whether the area refers to walls only
- whether ceilings are included
- whether the calculation already deducts openings
Without that information, comparing two prices is misleading. A lower rate can look attractive until you realise the ceiling has been excluded or the deduction for windows has been handled differently.
How to make your own rough estimate before requesting a quote
If you want a quick early estimate, a practical method is:
1. take the total floor area from the floor plan 2. multiply by 2.2 to 2.5 3. subtract major openings such as large glazing and doors
That gives you a decent working number for wall finishing. For a more refined indication, the /calculator helps. If you want real accuracy, however, nothing beats a proper intake or site-based review, because the quote then reflects the actual layout and finish level of your home.
Why this matters when comparing offers
Homeowners often focus on the rate per square metre without checking what quantity the rate is being applied to. That can be costly. A realistic area calculation is what makes the rest of the quote meaningful. Without it, you may think one company is cheaper when the opposite is true.
Conclusion
The average new-build floor area is useful as a starting point, but it is not the same as the real wall area you need to finish. Once you understand the difference between living area and net finishing surface, pricing becomes easier to predict and quotes become easier to compare. That knowledge does not just help with budgeting. It also helps you ask sharper questions and make better decisions about which finish and package fit your property.