The 7 most common mistakes in tender comparison

Even experienced surveyors fall into the same traps under deadline pressure. Here are the seven we see most often.

1. Comparing totals, not rates

The lowest total is not always the best value. Without comparing rates line by line, you can't tell whether a low price reflects efficiency or omission.

2. Mismatching line items

When contractors describe the same item differently, manual alignment introduces errors. Mismatched items quietly distort every subtotal that follows.

3. Missing the missing items

Unpriced items are easy to overlook in a dense spreadsheet, yet they're the single biggest cause of apparent — but false — savings.

4. Ignoring qualifications and exclusions

A keen price with heavy exclusions can be far more expensive than a higher, fully inclusive bid.

5. Not flagging outlier rates

An unusually high or low rate is a signal, not noise. Left unexamined, it can hide a scope misunderstanding that surfaces as a variation later.

6. Transcription errors

Manually retyping rates into a comparison sheet is a reliable source of mistakes — and they're hard to spot once embedded in formulas.

7. No audit trail

If you can't trace a figure back to its source tender, you can't defend it. Recommendations without an audit trail are fragile.