How to Compare Tenders Effectively: A QS Guide

Tender comparison — sometimes called tender analysis or bid evaluation — is one of the most important tasks a quantity surveyor undertakes. Getting it right means the client appoints a competent contractor at a fair price. Getting it wrong can lead to cost overruns, disputes, and project failure. Yet the process is often rushed due to tight tender return deadlines.

Setting Up for a Fair Comparison

Effective tender comparison starts well before the returns arrive. The tender documents should include a clear pricing schedule or bill of quantities that all tenderers complete in the same format. This ensures you are comparing like with like, rather than trying to reconcile different pricing structures.

When tenders are returned, the first step is a compliance check. Have all tenderers submitted the required documents? Are there any qualified statements or conditions attached? Have they priced every item, or are there gaps? Non-compliant tenders should be flagged immediately, as missing items often indicate either a misunderstanding of the scope or a deliberate strategy to submit a low headline figure.

Arithmetic and Rate Analysis

Every tender should be arithmetically checked. Multiply quantities by rates and verify the extensions match. It is surprisingly common to find arithmetic errors in tender returns, and these must be identified before any comparison is meaningful. The industry convention is to treat the rate as correct and adjust the extension, but your employer's requirements or the tender instructions may specify a different approach.

Rate analysis is where the real value of a QS becomes apparent. Look at the individual rates rather than just the bottom-line total. Are any rates significantly higher or lower than the others? Abnormally low rates may indicate the tenderer has misunderstood the item, is planning to use lower quality materials, or is front-loading the contract. Abnormally high rates might suggest risk pricing or limited experience with that type of work.

Beyond the Numbers

Price is important, but it should not be the only criterion. Consider the tenderer's experience with similar projects, their proposed programme, their health and safety record, supply chain capacity, and financial stability. A client who always selects the cheapest tender will eventually be burned by a contractor who cannot deliver.

The tender report should present the analysis clearly, highlighting the key differences between submissions and providing a recommendation with supporting rationale. A well-prepared tender comparison gives the client confidence in the appointment decision and provides a reference document if disputes arise later.

Using Technology to Streamline the Process

Modern tools can significantly reduce the time spent on tender comparison. MyQS includes a tender comparison module that imports Excel pricing schedules from multiple tenderers, normalises the data, and produces a detailed side-by-side analysis. The AI identifies anomalies, missing items, and pricing outliers automatically, generating a comprehensive comparison report that would take hours to produce manually.

The output is a multi-sheet Excel workbook containing the summary comparison, detailed item-by-item analysis, anomaly flags, and a recommendation matrix. This does not replace professional judgement, but it gives the QS a solid analytical foundation to work from, saving significant time during the critical tender evaluation period.