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A building survey is the precise capture of dimensions, areas, volumes or quantities directly on site. In construction, it documents the actual condition of a building and provides the basis for planning, billing, documentation and refurbishment.
Why is a building survey important?
- Reliable basis: Objective measurements help prevent incorrect quantities, change orders and misunderstandings.
- Efficient processes: Digital data capture replaces manual notes and accelerates quotations, tenders and applications.
- Legal certainty: Traceable quantities and tolerances support handover, warranty processes and invoice verification.
- Future-ready data: Structured survey data can be used in CAD/BIM, CAFM systems and energy assessments.
What is captured in a building survey?
- Lengths, widths and heights
- Areas
- Volumes, where required
- Building component quantities
- Room data
What is a building survey used for?
- Planning
- Tendering
- Billing
- Documentation
- Refurbishment and renovation
Types of building surveys
- Floor area measurement: Calculation of usable, circulation and functional areas based on defined standards and measurement rules.
- Digital building survey: Digital capture of buildings using workflows based on laser scanning, LiDAR or photogrammetry.
- Deformation-accurate survey: Capture of actual geometries, including deformations, irregularities and deviations from the planned condition.
Common mistakes and misunderstandings
- No reference to standards: Areas should not be calculated without a clear measurement rule, as this makes results difficult to compare.
- Unclear tolerances: Missing accuracy classes make planning, decision-making and billing more difficult.
- Media breaks: Paper notes can lead to transfer errors. Digital capture reduces manual effort and data loss.
- Incomplete attributes: Measurements without context, such as room, material or component class, limit further use.
- Duplicate site visits: Missing photos or metadata can make additional inspections necessary.
Building Survey vs. Digital Building Survey
- Building survey: The general term for capturing quantities and measurements directly on site – either manually or digitally.
- Digital building survey: A building survey carried out with digital sensors and workflows. It is faster, more reproducible and easier to process further.
FAQ
Which standard should be used to calculate building areas?
In Germany, DIN 277 is commonly used for buildings. Depending on the context, other standards or rules such as GIF or WoFlV may also be relevant.
What level of accuracy is useful for a refurbishment project?
For early design planning, centimetre-level tolerances are often sufficient. For detailed design or execution planning, millimetre-accurate scans or deformation-accurate surveys are usually required.
Which formats are used to deliver building survey data?
For 2D data, common formats include DWG, DXF and PDF. For 3D data, point clouds such as E57 or LAS and BIM models such as IFC are typically used, usually together with metadata and quality reports.