BBR Use Codes: What They Control and Where They're Wrong

The use code is one of the most overlooked fields in BBR (the Buildings and Dwellings Register) — and at the same time one of the most expensive to get wrong. It states what a building or a unit is officially used for, and that single value reaches far beyond the register itself: it carries through into property taxation, into credit assessment, into insurance, and into the municipality’s view of what may lawfully take place behind the façade.

For a valuer, a building consultant or a lender, the use code is therefore rarely just a lookup. It is a claim about the property that you can either trust or ought to test. And because the code was often set years ago — in connection with a permit process that may not reflect today’s actual use — it is one of the fields where the gap between the register and reality is widest. That makes it both a risk and, in the right hands, an opportunity.

What a BBR use code actually is

The use code is a standardised numeric code in BBR that indicates what a building — and in some cases the individual unit — is registered as being used for. The categories span the full spectrum, from detached single-family houses and terraced/linked/semi-detached houses, through multi-storey residential buildings, to commercial uses such as office, retail, industry, warehousing and agriculture, as well as institutions, culture and leisure.

The key thing to understand is that the code describes the registered use, not necessarily the actual or the lawful one. The three can be three different things:

• Registered use: what BBR says right now.
• Actual use: what is physically going on in the building today.
• Lawful use: what the planning framework, and any building permit, allow.

When the three coincide, the property is straightforward. When they diverge, tax, legal and financial questions all arise. For a more thorough walkthrough of how use codes interact with areas and verification, see the article on BBR as a data source: areas, use codes and verification.

What the code controls in practice

The use code is rarely a passive field. It is a junction point from which other systems draw their assumptions.

Taxation

Property taxation starts from what a property is used for. Residential use, commercial use and agriculture are treated differently in the assessment and taxation system, and the categorisation affects both the assessment itself and the taxes calculated on top of it. A unit that is in reality residential but is registered as commercial — or the other way round — can therefore be taxed on the wrong basis. The specific rates and rules change continually and should always be verified with Vurderingsstyrelsen (the Property Assessment Agency) or the municipality, but the principle is stable: use is one of the variables that determines taxation.

Lending and credit assessment

For a lender, use determines which set of rules a loan falls under, and thereby the term, the loan-to-value ratio and the conditions. Residential financing and commercial financing are not the same product. If BBR says residential but the property is in reality run as commercial, the credit assessment rests on a false premise — and that is precisely the kind of thing that gets discovered in a due diligence rather than before a deal closes.

Lawful use

What may lawfully take place in a building is not decided by BBR but by the planning framework — typically a local plan and the municipal plan’s framework provisions — read together with the building permit. The BBR code is a mirror of this, not the source of it. But a discrepancy between the code and what is actually going on is often the first visible sign that the actual use may never have been legalised. What the planning framework permits, you read in the local plan — see our walkthrough of how to read a local plan.

Insurance

Insurance cover takes its starting point from the building’s use and layout. A commercial space insured as a dwelling — or a dwelling that in reality houses a business but is written up as pure residential — can, in the worst case, mean that the cover does not match the actual risk. The use code is not the policy, but it is one of the pieces of information on which the policy is built.

Where the code is typically wrong

Errors in use codes are not rare, and they follow some recurring patterns. The most common are:

• Conversions that were never registered. A former commercial building, or an outbuilding, converted into a dwelling without BBR — and often the building permit — keeping up.
• Mixed use simplified into a single code. A property with a shop on the ground floor and a dwelling above, where the whole building is registered as one or the other.
• Historic use that no longer fits. A discontinued farm where the operational buildings are now used for storage or housing but still carry the old agricultural code.
• Vacant or changed units. Empty commercial tenancies converted to residential — or dwellings taken into use as a clinic, office or workshop — without registration.
• Manual data-entry errors at the original creation, where the wrong category was chosen from the start.

Rule of thumb: If the use code does not match what you see on a recent aerial photo, a street-level photo or the building case itself, treat it as an open item to be resolved — not as a fact.

This kind of discrepancy is rarely caught by reading BBR on its own. It is caught by holding the register up against independent sources. The method is the same one we describe in the article on cross-checking BBR against reality with photos, the cadastre and the building case.

What a wrong code means for a project

For anyone valuing or developing a property, a wrong use code has two faces.

As a risk, it is a latent liability. An actual use that has not been legalised can trigger a demand from the municipality for legalisation — either de jure, by applying for the necessary permit, or physically, by returning the building to its former state. A wrongly coded property can also mean that taxation, lending and insurance rest on false premises, which get corrected at the worst possible moment: in the middle of a deal, or after a loss. In a due diligence, the use code is therefore one of the fields that must be reconciled against the planning framework and the building case before it can be relied on.

As an opportunity, an unexploited use can conversely be something to flag. A property where the planning framework permits a more intensive or more value-creating use than the current code reflects may hold a potential that has not been priced in. The point here is not that the code is wrong, but that it tells you something about a history that can be changed — naturally only within what the local plan and the municipal plan’s framework actually permit. That has to be clarified concretely with the municipality, not assumed.

Whether the angle is risk or opportunity, the same discipline applies: read the use code together with the areas, the planning framework and physical reality — never in isolation. The area concepts in BBR have pitfalls of their own, which we cover in the article on BBR areas explained: living area, heated area and footprint.

How to automate the reconciliation

The manual exercise — look up the code in BBR, hold it against the planning framework in Plandata.dk (the national planning data portal), check the building case, compare with the cadastre and a current aerial photo — is manageable for a single property. It becomes heavy the moment you are screening a portfolio or a whole street.

In Arcili, the BBR tab of the Ejendomme (Properties) module gathers that information in one place, so the use code sits alongside the areas, the planning status and the rest of the building data. That makes discrepancies faster to spot, because you do not have to jump between registers to see whether the code, the plan and reality hang together. The tool does not replace the professional judgement of whether a use is lawful — that decision rests with the municipality — but it removes most of the manual lookup work that otherwise comes first.

If you want to see how this looks on a concrete property, you can explore Arcili or book a walkthrough.