The QS in the Australian Construction Environment
Quantity Surveyors (QS's) operate at the intersection of design, finance, and construction delivery. Their job is to ensure the project is procured, built, and delivered within an agreed financial framework. Commercial builders rely heavily on QS-led cost planning; residential builders tend to perform QS functions internally.
Core Functions of the QS
Cost Planning
From concept to detailed design, the QS provides cost feedback to help the design team make financially informed decisions. This is crucial in projects under AS4000 or Design & Construct delivery models.
Measurement and Bills of Quantities
Using the Australian Standard Method of Measurement (ANZSMM), QS's quantify every element of work. These BoQs form the basis of tender pricing and contract sums.
Contract Administration Support
QS's validate variations, assess progress claims, manage cashflow forecasts, and evaluate prolongation or EOT cost claims.
Post-Contract Cost Control
- Cost-to-complete forecasting
- Risk allowance tracking
- Trade package financial reporting
- Final account settlement
Accuracy Standards in QS Work
Industry norms for accuracy tighten as design progresses:
- Concept: ±20–30%
- Design Development: ±10–15%
- Tender Documentation: ±5%
Expert Tip: A QS does not “price a job” — they “manage cost risk”. Their true value is in analysis, comparison, and scenario testing.