Which BBR Area Should You Use for a Valuation?

A price per square metre is only as good as the area you divide by. Take a sale price of DKK 4.2 million and divide by 142 m² of living area, and you get one figure. Divide by 156 m² of heated area, or by a registered area from an old deed, and you get three different prices per m² — for the exact same property. The gap can easily be 10–15 %, and it feeds straight into your valuation when you use comparable sales as a reference.

For a valuer, a building consultant, or a claims handler at an insurer, the choice of area is therefore not a technical nicety — it is the foundation under the entire calculation. The question is not just which area you use, but whether you apply the same area concept consistently to both the property you are valuing and the sales you compare it against. Here is the valuation-proof way to choose and document the area.

The area concepts you choose between

BBR (the Buildings & Dwellings Register) does not work with a single area, but with several, and they answer different questions. The most important in a valuation context are:

• Living area — the total area of the rooms belonging to the dwelling, measured to the outer face of the external walls. This is the figure typically quoted in sales particulars and in most market statistics.
• Heated area (total building area for residential/commercial use, heated) — the area that is heated, which can differ from the living area, for example with unused attic floors or partly heated extensions.
• Footprint (built-up area) — the building’s footprint on the plot, relevant for plot ratio and density, but rarely the right basis for a price per m² on a dwelling.
• Basement and attic area — often registered separately and not necessarily included in the living area, depending on ceiling height and use.

The point is that a price per m² is only meaningful if numerator and denominator are talking about the same thing. If you want to dig into the definitions and their measurement rules, they are covered in BBR area concepts explained: living area, heated area and footprint.

Which area for which valuation?

The choice follows the purpose of the valuation.

Market value of a dwelling

For a market valuation of a dwelling, the living area is almost always the right basis. It is the area a buyer pays for in practice, and it is the area underlying most comparable sales. If you use living area on your property, the reference sales must also be priced on living area — not on heated area, and not on a registered area.

Rebuilding and insurance value

If you are assessing rebuilding or insurance value, the logic changes. Here the relevant area is the one that actually has to be rebuilt — typically the total building area, including areas that do not count as living space (garage, converted basement, integrated outbuildings). A pure living-area view underestimates the rebuilding cost.

Commercial and mixed use

With commercial or mixed use, the use codes become decisive, because different parts of the building can have very different values per m². Here you should not settle for a single combined area, but break it down by use. How use codes and areas connect in the register is described in BBR as a data source: areas, use codes and verification.

Rule of thumb: use living area for the market value of a dwelling, total building area for rebuilding, and area split by use for commercial. And always use the same concept on the valuation subject and on the references.

BBR area versus registered and cadastral area

The registered area and the cadastral area measure something other than BBR’s building areas — and the two are often confused.

• Cadastral area is the area of the plot, registered in matriklen (the cadastre) at the Danish Geodata Agency. It says nothing about how many m² of dwelling stand on the plot.
• Registered area is the area shown in the title documents in tingbogen (the Land Registry). For owner-occupied flats, the registered apportionment figure and the flat’s area are central, while for detached houses it is most often the plot area that is referenced.
• BBR areas describe the buildings — the constructed building stock as registered by the owner and the municipality.

In practice this means you use BBR’s living area as the denominator in a price per m² on a dwelling, while cadastral and land registry information is used to understand the plot and the legal rights — not to calculate the price per m² of a dwelling. Knowing the difference prevents the classic error where the area of an owner-occupied flat is confused with the plot area in a spreadsheet.

When the areas don’t match

They often don’t match. An extension has been built without being fully registered in BBR, an attic has been brought into residential use without a building permit, or an old deed works with a different area from the current BBR figure. For a critical valuation, the discrepancy is not a problem to be hidden — it is information.

Here is how to handle it in a valuation-proof way:

1. Identify the discrepancy. Note which sources disagree, and how large the spread is in m² and as a percentage.
2. Find the likely cause. A missing registration of an extension, unlawful use, a difference in measurement rules (for example a basement counted in one place but not another), or a simple data-entry error.
3. Choose your working area deliberately. If the physical and lawful area differs from BBR, you must decide whether you are valuing the lawful state or the actual one — and state which.
4. Adjust the risk, not just the figure. An unregistered or unauthorised area can reduce the area a buyer will actually pay full price for, and can trigger a regularisation risk that belongs in the valuation.

A photo, a cadastral map and the original building case are the three strongest sources when you need to establish what actually stands on the plot. The approach is covered in cross-checking BBR against reality: photo, cadastre and building case. Note that BBR data is owner-reported, and that the register can contain errors; figures you base a valuation on should therefore be verified, and where the lawfulness is in doubt, the matter should be clarified with the municipality.

Document the area basis — every time

What separates a durable valuation from one that collapses at the first objection is rarely the figure itself. It is the documentation of how you arrived at the area basis. Write into the valuation:

• Which area concept you used (for example living area), and why it fits the purpose.
• Which source the figure comes from (BBR, and which building/unit ID), and when it was retrieved.
• Whether you identified discrepancies against the registered or cadastral area, and how you dealt with them.
• That the same area concept was used on the reference sales.

The fourth line is the most overlooked and the most valuable. A price per m² derived from one reference on living area and another on heated area is not comparable — and a counterparty who knows the difference will find it.

How Arcili automates the manual exercise

In practice it is time-consuming to retrieve the right BBR area, look it up against the registered and cadastral area, and make sure the reference sales are priced on the same area concept — for every single property. That is exactly the exercise the Boligvurdering (Valuation) module builds on: the area basis is retrieved from BBR together with the other building data, and the prices per square metre in the comparable sales are calculated on a consistent basis, so that numerator and denominator are talking about the same thing. You are still left with the professional judgement — which area is the right one for this case, and how a discrepancy should be weighted — but the data collection itself and the first consistency checks are done for you.

If you want to see how the area basis and the comparable sales connect in a concrete valuation, book a walkthrough.