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BBR and illegal building work: read the record before you buy in Denmark

How to read the BBR building record before buying, find discrepancies from reality, and avoid inheriting illegal building conditions. A buyer-friendly guide with figures, steps and what a legalisation can cost in Denmark.

Updated: 2026-07-17

The short answer: the BBR-Meddelelse is the property’s official register record with living area, number of rooms, build year and heating supply. Your task before bidding is to compare the registered figures with reality, because when you take over the home you take over responsibility for BBR being correct.

Where to find it

The BBR-Meddelelse sits in the property data report, which gathers around 50 public data points and costs 105 kr. at boligejer.dk. Read it as a factual basis, not as marketing.

How to compare BBR with reality

Check that the registered living area, rooms and heat source match what you see at the viewing. A converted basement or attic, an extra dwelling, or a different heat source than registered are the classic discrepancies. Note the differences, they are your starting point for questioning the agent.

When the discrepancy is an illegal condition

A wrong BBR can mask a conversion without a building permit, unauthorised electrical or plumbing work, or unapproved habitation. It is not proof of foul play, but it is something to clarify, because legality follows the house. Ask for documentation of building permits and authorised work.

You inherit the problem

When you take over the home, you take on responsibility for BBR being correct and for legalising illegal conditions. The municipality can fine up to 5,000 kr. for incorrect or missing information, and a legalisation can cost more if something must be rebuilt or approved. That is why clarification belongs before the bid.

Legalisation: what it can cost

Legalisation can be legal, that is getting a permit in place, or physical, that is rebuilding so it meets the rules. The physical route is the expensive and uncertain one. The cost depends entirely on what is missing, from a cheap approval to a larger rebuild. Have a building surveyor or tradesperson assess the scope before you price it into the bid.

Your checklist before bidding

Get the property data report, read the BBR-Meddelelse, and reconcile area, rooms and heat with reality. Ask about building permits for anything converted, and about authorised electrical and plumbing work. For unresolved illegal conditions: demand documentation, negotiate, or move on. Paste the listing into Heimer, and we surface the figures you should hold up against the BBR.

Common questions

What is a BBR-Meddelelse?

The property's official register record with registered living area, number of rooms, build year and heating supply. You find it in the property data report.

What if the BBR is wrong?

The owner must correct errors via "Ret BBR" at bbr.dk, and responsibility follows ownership at completion. The municipality can fine up to 5,000 kr.

Do I inherit illegal building conditions?

Yes. Legality follows the house, so unresolved conditions become your responsibility after completion. That is why clarification belongs before the bid.

What does a legalisation cost?

It depends entirely on what is missing, from a cheap approval (legal legalisation) to a larger rebuild (physical legalisation). Have a professional assess the scope.

Where do I find the BBR before buying?

In the property data report via boligejer.dk, which costs 105 kr. and gathers around 50 public data points on the home.

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