Administrative bestemmelser (1) Eksempelsamling om ombygninger – Danish Renovation Examples and Permit Guidelines
The document Eksempelsamling om ombygninger og andre forandringer is a formal collection of examples issued by the Danish Transport, Construction and Housing Authority (Trafik-, Bygge- og Boligstyrelsen). It functions as a specialized guidance document for the administrative provisions found in § 1 - § 47 of the Danish Building Regulations 2018 (BR18). Updated in January 2021, the text provides a standardized framework for determining which types of construction work require a formal building permit (byggetilladelse) and which can be executed without an application, provided specific technical conditions are met.
The scope of the guidelines covers multiple building categories, specifically apartment buildings (etageboligbyggeri), single-family houses (enfamiliehuse), semi-detached houses (dobbelthuse), terraced houses (rækkehuse), and summer houses (sommerhuse). It details the regulatory thresholds for ombygning (renovation) and forandring (modification). A renovation is generally defined as changes within the existing physical frame, such as attic utilization or room repurposing, that do not increase the total floor area. Modifications may involve expansions in area, height, or volume. For projects requiring a permit, the document specifies the placement in konstruktionsklasser (structural classes) and brandklasser (fire classes), as well as the necessity for certified structural engineers (certificeret statiker) or fire consultants (brandrådgiver).
The following sections detail the criteria for permit exemptions and technical compliance for various project types based on the administrative and technical chapters of BR18.
Permit Exemptions under BR18
In accordance with BR18, § 5, certain renovations and modifications are exempt from building permit applications if they fulfill specific criteria regarding area and use.
- Small Residential Units: For single-family, semi-detached, and summer houses, work is exempt if it does not increase the floor area or result in a significant change in use (§ 5, stk. 1, nr. 3).
- Apartment Buildings: Modifications are exempt if they do not alter the load-bearing system's function, do not change fire safety assumptions, do not expand the floor area, and do not change the building's use (§ 5, stk. 1, nr. 4).
- Municipal Assessment: If the work deviates from the building rights defined in BR18, chapter 8, the municipality must perform a total assessment, which mandates a building permit.
Structural and Fire Safety Classifications
Construction work requiring a permit must be documented according to BR18, § 10, stk. 1-7, which includes classifying the project into structural and fire safety levels.
- Structural Class (Konstruktionsklasse): Projects that alter the load-bearing system or introduce new load-bearing elements must be assigned a class. For apartment buildings, this is typically KK2-4, requiring a certified structural engineer.
- Fire Class (Brandklasse): Changes affecting fire safety assumptions require classification. Apartment buildings generally fall into BK2-4, requiring a certified fire consultant.
- Class 1 Exceptions: Small houses (single-family) typically fall into KK1 and BK1, where certified consultants are generally not required unless specific complexities exist.
Technical Requirements for Existing Structures
Renovations must comply with current technical standards for the modified components, while untouched existing elements may often remain under their original permit conditions.
- Modified Structures: Only the specific structures affected by the work must meet the current requirements of BR18, chapter 15.
- Fire Safety Units: Work within a fire unit and its escape routes must follow modern regulations. Existing fire conditions that are not directly influenced can remain unchanged as per BR18, chapter 5.
- Floor Area Calculation: The total floor area includes basements, open balconies, and roof terraces. This calculation determines permit necessity and is governed by BR18, chapter 23.
Frequently Asked Questions
Does a new door opening in a load-bearing wall require a permit?
Yes, in apartment buildings, a new door or window hole in an internal load-bearing wall requires a permit and must be placed in structural class 2-4 with a certified structural engineer.
Can I move a kitchen to another room without a permit?
In apartment buildings, moving a kitchen is generally exempt from a permit if fire seals at pipe penetrations maintain the original fire resistance of the floor/wall.
What is the threshold for external insulation without a permit in small houses?
External insulation of up to 25 cm on walls and roofs of single-family or summer houses is exempt if it does not expand the floor area beyond specific regulatory limits.
When is a certified structural engineer mandatory?
A certified structural engineer is required when the construction work is classified in structural class 2, 3, or 4, which is the standard for most modifications in apartment buildings.
Is a permit needed for attic utilization?
Yes, utilizing a previously unused attic for residential purposes typically expands the floor area or changes the use, thus requiring a building permit.
Are internal non-load-bearing walls exempt from permit applications?
Yes, the removal or establishment of non-load-bearing walls within an existing apartment or house is generally exempt from permit requirements.
