BR18 (Bygningsreglementet 2018) is the Danish national building code. It sets the legal requirements for all construction in Denmark — new builds, extensions, conversions and in some cases renovations. It covers energy performance, fire safety, structural integrity, accessibility and, since 2023, carbon footprint.
Why does it matter to you?
Any building permit application in Denmark must demonstrate compliance with BR18. This affects:
- How much insulation your walls, roof and floor need
- Energy consumption limits (the energy frame)
- CO₂ limits for large new buildings (LCA requirement)
- Fire safety requirements for your staircase, roof and facade materials
- Accessibility for new buildings and major renovations
BR18 is updated regularly. Recent additions include mandatory LCA calculations and CO₂ limits — part of Denmark’s push for greener construction.
Key sections of BR18
Energy frame: Maximum permitted energy consumption for heating, cooling and lighting per m².
LCA requirement: Buildings over 1,000 m² must document that their total carbon footprint stays below 12 kg CO₂-eq/m²/year (from 2023) and 10 kg (from 2025).
Voluntarity classes: BR18 includes two voluntary classes — a more ambitious Energy Class and a Sustainability Class — for projects aiming beyond minimum requirements.
Frequently asked questions
Does BR18 apply to my home renovation?
Partially. BR18’s energy requirements apply when you replace major building elements (windows, roof insulation, heating system). Minor maintenance work is exempt.
Where can I read BR18?
The full text is available at bygningsreglementet.dk — it’s free and publicly accessible.
What’s the difference between BR18 and the local development plan?
BR18 is national law. A development plan (lokalplan) is a local municipal regulation. Both must be complied with — whichever is stricter applies.