18/09/2026
An abnormal rate is a question, not an answer.
When a number sits well outside your normal range, investigate the difference before accepting it.
The rate may be completely valid. Perhaps the specification changed. Access is difficult. The quantity is small. The market has moved. The supplier has included additional scope. Or the installation methodology is different.
But it could also be an error.
That is why anomalies are valuable. They tell the estimator where to look.
Compare the rate with other quotes, historical data and project benchmarks. Check the quantity and unit. Review the scope coverage. Confirm the document revision. Ask whether freight, labour, equipment, preliminaries or other requirements have been included differently.
Do not automatically replace the abnormal rate with the average.
First understand why it is abnormal.
Sometimes the outlier is the only quote that has properly understood the scope. Sometimes it exposes a mistake in your own estimate. Sometimes it is simply wrong.
The estimator's job is to determine which situation applies.
A tender review becomes stronger when unusual numbers are explained rather than ignored.
If a rate cannot be defended, it should not pass through the estimate unquestioned.
When you spot a major pricing outlier, what is the first check you make?