DIN 4109-1:2026-09 - Draft

What is DIN 4109-1 about?

DIN 4109 is the central series of standards for sound insulation in building construction. Depending on the part, it covers requirements, calculation-based verification methods or technical principles for acoustic planning and assessment of buildings.

DIN 4109-1 defines the fundamental requirements for structural sound insulation in residential and non-residential buildings. It specifies requirements for airborne and impact sound insulation of building components, protection against external noise, and permissible sound pressure levels for building services installations. The aim is to ensure health protection, confidentiality during normal speech, and protection against unreasonable disturbance caused by noise.

What content does the standard cover?

DIN 4109-1 describes the acoustic requirements for different types of buildings and occupancy units, as well as the key assessment parameters for sound insulation.

Topics covered at a glance:

• Requirements for airborne and impact sound insulation in residential buildings
• Sound insulation in office buildings and mixed-use buildings
• Requirements for hotels, hospitals and schools
• Sound insulation against external noise and traffic noise
• Sound insulation between particularly noisy rooms and rooms requiring protection
• Requirements for building services installations and ventilation systems
• Permissible sound pressure levels of technical installations and commercial operations
• Classification of fittings and devices used in drinking water installations

Why is the standard relevant in practice?

DIN 4109-1 provides the basis for the planning, assessment and implementation of sound insulation measures in building construction. It supports architects, civil engineers and specialist planners in systematically taking minimum sound insulation requirements into account and selecting suitable building constructions as early as the design phase.

The requirements for the sound insulation of walls, floors, doors and external building components are particularly relevant, as are the specifications for technical building equipment. The standard therefore provides an important basis for living comfort, quality of use and legally reliable planning.

What changes have been made compared with the previous edition?

Compared with DIN 4109-1:2018-01, the draft has been extensively revised. The most important changes include:

• Revision of the introduction and the requirement parameters
• Adaptation and partial deletion of requirement values in several tables
• Revision of the requirements for sound insulation against external noise
• Updating of various acoustic characteristic values and assessment parameters
• Editorial revision of the document

Target group

DIN 4109-1 is aimed in particular at:

• Architects
• Civil engineers
• Specialist planners for building physics and acoustics
• Sound insulation experts
• Housing companies
• Inspection engineers
• Planning and engineering offices

Supplementary standards in the DIN 4109 series

For comprehensive planning of structural sound insulation, further parts of the DIN 4109 series may be relevant depending on the specific application. These include calculation-based verification methods, component catalogues for different construction methods, as well as provisions for building services installations and special sound insulation verification.