Infrastructure Quantity Surveying Training: Measuring Structural Excavation from Drawings

Asad Ali

Fri, 18 Sep 2026

Infrastructure quantity surveying requires accurate interpretation of drawings, identification of measurement limits and careful calculation of quantities. One practical exercise in an infrastructure quantity surveying course is the measurement of structural excavation using actual project drawings, AutoCAD and an Excel quantity sheet.

Structural Excavation Quantity Item

A structural excavation item may describe excavation from the existing ground level down to the required excavation level. The item should be reviewed carefully to establish the extent of work included before the quantity take-off is completed.

The quantity surveyor must identify the excavation limits, the relevant dimensions and the excavation levels shown on the structural drawing. These details form the basis for calculating the excavation volume.

Practical Excavation Take-Off Process

1. Review the structural drawing: Use the structural drawing as the source of information for the excavation works.
2. Identify excavation limits: Establish the boundaries of the excavation from the drawing.
3. Obtain dimensions and levels: Take the required plan dimensions and levels needed to determine excavation depth and volume.
4. Record measurements: Transfer the measured information into an Excel quantity sheet.
5. Calculate excavation volume: Use the recorded dimensions and levels to calculate the excavation quantity. Excavation volumes can be substantial, so accuracy is important.
6. Cross-check the result: Compare the calculated quantity against the drawing to confirm that the scope and limits have been measured correctly.
7. Build the quantity scope: Define the work covered by the quantity item before finalising the take-off.

Using AutoCAD and Excel for Quantity Take-Off

AutoCAD can be used to review structural drawings and obtain the dimensions required for the take-off. The measured information can then be transferred to an Excel quantity sheet for calculation, checking and presentation.

This workflow helps learners connect drawing interpretation with a structured quantity calculation process. It also reinforces the importance of checking calculated quantities against the source drawing before completing the measurement.

Learning Outcome

This practical take-off forms part of an infrastructure quantity surveying course that works with actual drawings. Learners practise identifying excavation limits, extracting dimensions and levels, calculating excavation volumes and developing a clear quantity scope for structural excavation works.