Bekendtgørelse om bygningsreglement 2018 (BR18) – Danish National Building Regulations
The Bekendtgørelse om bygningsreglement 2018 (BR18) is the official statute governing construction standards in Denmark. Issued by the Social-, Bolig- og Ældreministeriet (Ministry of Social Affairs, Housing and Elderly), it operates under the authority of the Danish Building Act (Byggeloven). This version, specifically referencing BEK nr 1399 af 12/12/2019, includes subsequent amendments up to 2024 and establishes the mandatory technical and administrative requirements for all building works within the kingdom.
The document is divided into four primary sections: Administrative Provisions (Afsnit I), Technical and Planning Provisions (Afsnit II), Other Provisions (Afsnit III), and Penalties and Commencement (Afsnit IV). It regulates a broad range of domains including fire safety, structural stability, energy consumption, indoor climate, and accessibility. It applies to the construction of new buildings, extensions, and significant alterations or changes in use for existing structures. BR18 introduces a system of Construction Classes (Konstruktionsklasser) and Fire Classes (Brandklasser) that dictate the level of documentation and the required involvement of certified professionals.
This regulatory framework defines specific performance targets and calculation rules, such as the building percentage (bebyggelsesprocent), U-values for building components, and energy frames for different building categories. It serves as the legal baseline for municipal building authorities when evaluating permit applications and performing spot checks on completed projects.
Administrative Scope and Permit Exemptions
The regulations apply to all buildings unless specifically exempted under § 4. Administrative provisions in Afsnit I outline the responsibilities of the municipal board (kommunalbestyrelsen) as the building authority.
- § 4 Exemptions: Bridges, tunnels, and structures for traffic purposes approved by relevant authorities, as well as small technical huts up to 30 m².
- § 5 Permit-free Works: Construction of secondary buildings like garages, carports, and sheds provided the total area does not exceed 50 m² and they are placed on the ground.
- § 10 Permit Requirements: Detailed information for identification (cadastral number, address), project descriptions, and documentation of construction and fire classes.
- § 13 Dispensations: Municipalities may grant exemptions from provisions if they are deemed compatible with the intent of the regulation, except for fire or safety requirements.
Construction and Fire Classes
BR18 categorizes projects based on complexity and risk, requiring the involvement of certified structural engineers (statikere) and fire consultants (brandrådgivere) for higher-risk classes.
- Construction Classes (KK1–KK4): Based on consequence class, complexity, and experience. KK1 covers simple structures like detached houses without horizontal apartment partitions; KK4 covers high-risk structures where failure consequences are particularly severe (§ 489).
- Fire Classes (BK1–BK4): Determined by the risk class and the chosen documentation method. BK1 is limited to buildings up to 600 m² using pre-accepted solutions (§ 493).
- Certified Roles: Projects in classes 2-4 must involve a certified professional to document compliance with fire (§ 20) and structural (§ 16) requirements.
Fire Safety and Protection
Kapitel 5 details the safety requirements for persons and animals. It focuses on limiting the spread of fire and smoke and ensuring safe evacuation.
- § 86 Risk Classes: Buildings are placed in one of six risk classes based on the complexity of evacuation and fire load.
- § 93 Alarm Systems: Automatic fire alarms are mandatory for specific categories, such as accommodation units with more than 10 rooms or 50 beds.
- § 117 External Walls: Facades and roofs must be designed to limit the spread of fire between buildings and different fire units.
Energy Consumption and U-Values
Kapitel 11 sets the energy frame for buildings, including specific limits for heating, cooling, and ventilation energy usage per square meter.
- § 259 Energy Frame (Residential): Maximum total energy need of 30.0 kWh/m² per year plus 1,000 kWh per year divided by the heated floor area.
- § 260 Energy Frame (Other): Maximum energy need of 41.0 kWh/m² per year plus 1,000 kWh per year divided by the floor area.
- Bilag 2 Table 1: Minimum thermal insulation requirements, such as a U-value of 0.30 W/m²K for external walls and 0.20 W/m²K for roofs.
Accessibility and Indoor Climate
Construction must ensure safe access for all users and provide a healthy environment through ventilation and natural light.
- § 51 Accessibility: Level access is required for all building entrances. Doorsteps must not exceed 2.5 cm in height.
- § 379 Daylight: Workrooms and living rooms must have adequate daylight. Compliance is documented if the glass area equals at least 10% of the relevant floor area.
- § 443 Ventilation: Living rooms and dwellings must have a fresh air supply of at least 0.30 l/s per m² of heated floor area.
Frequently Asked Questions
When can I build a garage or carport without applying for a permit?
Under § 5, secondary buildings like carports and sheds can be built without a permit if they are not integrated into the main house, have a total area under 50 m², and are placed on the terrain.
What is the maximum allowed height for a doorstep in a building?
According to § 51, stk. 2, nr. 3, doorsteps at building entrances must not exceed a height of 2.5 cm to ensure accessibility.
What is the required amount of daylight for workrooms in Denmark?
Per § 379, rooms must be adequately lit. This is generally met if the glass area (corrected for shading) corresponds to at least 10% of the floor area.
What are the fire safety requirements for summer houses?
Summer houses are generally exempt from certain accessibility and indoor climate rules but must comply with height and distance rules (§ 178) and fire safety requirements for construction (§ 82).
How is the building percentage (bebyggelsesprocent) calculated?
Per § 453, it is the floor area of the building expressed as a percentage of the total site area. Specific rules in § 455 determine which areas (like basements or attics) are included.
What is the minimum fresh air supply for a new dwelling?
Under § 443, living areas and the total dwelling must have a minimum outdoor air supply of 0.30 liters per second per square meter of heated floor area.
