DIN 18202:2026-08 - Draft

What is DIN 18202 about?

DIN 18202 defines the principles for tolerances in building construction. It specifies permissible dimensional deviations, angular deviations, flatness deviations and alignment deviations in construction work and describes how they are determined, checked and assessed. The standard applies to buildings and building components regardless of the construction material and provides an essential basis for quality assurance in building construction.

DIN 18202 makes it possible to clearly define requirements for dimensional accuracy in building construction, the fit of building components and the usability of buildings. It supports the coordination of different trades and reduces conflicts at interfaces and joints.

What content does the standard cover?

DIN 18202 describes the principles for specifying and checking construction tolerances as well as requirements for measuring methods, measuring points and limit values. It covers both permissible deviations in construction work and their assessment with regard to function and use.

Topics covered at a glance:

• Tolerances in construction work and dimensional accuracy in building construction
• Dimensional tolerances and limit deviations for buildings and building components
• Angular, flatness and alignment deviations
• Limit values for flatness deviations of floors, ceilings and walls
• Tolerance classes and increased flatness requirements
• Measuring methods, measuring points and checking of construction tolerances
• Fits, joints and measures in the event of deviations

Why is the standard relevant in practice?

DIN 18202 is one of the most important standards for building construction work. It creates uniform requirements for construction tolerances and enables an objective assessment of execution quality. Designers, construction companies, experts and clients are provided with a common basis for assessing dimensional accuracy, flatness according to DIN 18202 and execution accuracy.

The requirements for DIN 18202 flatness deviations, limit values for flatness deviations, dimensional tolerances in building construction, angular deviations and fits at interfaces are particularly relevant. These requirements directly influence the installation of subsequent building components, the function of the building and coordination between different trades.

In addition, the standard supports the traceable checking of construction tolerances and the assessment of deviations as part of construction supervision and quality assurance.

What changes have been made compared with the previous edition?

Compared with DIN 18202:2019-07, the draft contains several technical and editorial revisions. The most important changes include:

• Revision of the principles for taking tolerances into account
• Introduction of the design principle for specifying tolerances, particularly for interfaces
• Revision of the application of limit values for flatness deviations
• Addition of general provisions for checking
• Revision of measuring points for checking position in space
• New section “Measures in the event of deviations”
• Updated introduction, scope and references

In addition, the principles for tolerance design have been further developed, and the requirements for flatness deviations according to DIN 18202 have been more clearly differentiated according to structural and finishing applications.

Target audience

DIN 18202 is aimed in particular at:

• Architects and civil engineers
• Designers, specialist site managers and construction supervisors
• Construction companies and executing trades
• Experts, assessors and testing bodies
• Quality managers and clients in building construction

Conclusion

DIN 18202 is the central standard for tolerances in building construction and for assessing the dimensional accuracy of buildings and building components. It defines requirements for dimensional tolerances, flatness deviations, angular deviations, alignment deviations as well as their checking and assessment. The current draft particularly strengthens the principles for construction tolerances, fits in building construction, the checking of flatness deviations and the assessment of interfaces, thus providing an important basis for quality assurance and professional construction work.

This document replaces DIN 18202:2025-09 .