Selecting a contractor solely because they submitted the lowest price can lead to additional costs, delays, or disputes during construction. A sound evaluation compares scope, quantities, specifications, methods, programme, payment terms, and delivery capability on an equal basis.
Start with the same tender documents
Every bidder must receive the same revisions of the drawings, specifications, BOQ, programme, and tender instructions. If the information differs, the bids cannot be compared objectively. Record each clarification and distribute any answer that affects the scope to all bidders.
Check administrative and technical completeness
Before evaluating prices, confirm that every required submission has been provided, including company profile, relevant experience, key personnel, work plan, programme, equipment schedule, and required legal documents. Material omissions should be clarified rather than assumed to be included.
Normalise the bid scope
Prepare an item-by-item comparison and identify unpriced, excluded, or differently assumed work. The submitted total is not always the correct comparison value. Add evaluation adjustments to equalise the scope without altering the bidder’s original submission.
Check arithmetic and abnormal prices
Verify quantity and rate calculations, subtotals, taxes, and totals. An unusually low rate may indicate an error, misunderstood scope, or front-loading strategy. Unusually high rates also require clarification. The objective is to understand the risk behind the price distribution, not to force all rates to be identical.
Compare commercial terms
- Bid validity period.
- Advance payment and progress-payment terms.
- Retention, bonds, and defects liability period.
- Included and excluded taxes or charges.
- Variation and extension-of-time provisions.
- Procurement schedule for major materials.
Assess delivery capability
A complete price still needs capable delivery. Review experience on comparable projects, team availability, financial condition, current workload, quality and safety systems, and performance references. For complex work, a presentation or interview can test the bidder’s understanding of risks and methodology.
Use an evaluation matrix
Define criteria and weightings before reviewing final results to reduce bias. Typical criteria include technical compliance, experience, project organisation, programme, commercial completeness, and corrected bid value. Record the reason for each score so the decision remains auditable.
Red flags requiring clarification
- Numerous blank or zero-priced items without explanation.
- Broad exclusions that conflict with the tender documents.
- An extremely short programme without adequate resources.
- A low initial price combined with unclear variation terms.
- Excessive dependence on large advance payments.
Prepare a transparent recommendation
The final report should show the submitted price, arithmetic corrections, scope adjustments, evaluated price, outstanding issues, technical assessment, and recommendation. The preferred contractor is not necessarily the cheapest, but the bidder offering the most acceptable combination of value, capability, and risk.
For consistent bid-comparison tables and tender records, consider the Ready-to-Use Quantity Surveyor Pro Template Package.
Professional implementation framework
Contractor tender evaluation must compare equivalent scope and risk, not only the lowest total. A low bid can become expensive when it contains exclusions, different quantities, abnormal rates, an unrealistic programme, or weak delivery capability.
Roles and accountability
Procurement controls process and confidentiality; the quantity surveyor checks arithmetic, quantities, rates, and normalization; engineers assess method and technical compliance; planners assess programme; safety and QA/QC review systems; finance reviews capacity; the tender committee decides under conflict-of-interest declarations.
Mandatory inputs and hold points
Tender documents, addenda, return schedules, priced BOQ, technical proposal, method, programme, labour, equipment, organization, experience, supplier quotations, exclusions, qualifications, cash flow, legal information, safety and quality submissions, and the clarification register form the basis.
Every hold point must be recorded in the Inspection and Test Plan. Work must not proceed on verbal approval alone when the next activity will conceal or remove inspection evidence.
Control sequence
- Complete compliance checks for mandatory documents, signature, validity, securities, and material deviations before price comparison.
- Check arithmetic, units, quantities, blank rates, front loading, unbalanced rates, provisional items, tax, discounts, and totals.
- Normalize bids to a common scope, showing additions or deductions transparently without changing the bidder original submission.
- Assess method, programme, resources, experience, quality, safety, commercial capacity, and risk using preapproved criteria and weights.
- Issue written clarifications, record responses, reconcile tenders, complete due diligence, and recommend on value and risk.
Acceptance criteria
Bidders are compared on one basis, normalization is visible, deviations and exclusions are valued, critical rates are tested, programmes are deliverable, resources are credible, and recommendation has clear reasons and approval trail.
Convert each criterion into a checklist item supported by a measurement, compliant/noncompliant status, location, date, document revision, inspector, and photograph. Terms such as good or adequate are not acceptable without a defined measure or reference.
Quality records and handover
Retain tender issues, acknowledgements, opening records, compliance matrix, arithmetic checks, normalized comparison, clarifications, interview minutes, technical and commercial scoring, due diligence, recommendation, approval, and notifications.
Index records by area and date so they remain traceable during changes, claims, defects, and owner reviews. Incomplete documents become outstanding items with an owner and target closure date.
Risk and nonconformance
Risks include bid leakage, changing criteria, biased normalization, unbalanced pricing, hidden qualifications, collusion, unproven capacity, and award on lowest total alone. Separate facts from preferences and use independent review.
Do not conceal a finding with subsequent work. Identify the area, review the cause, approve corrective action, and reinspect. A repair is closed only when objective evidence confirms that the required function and quality have been restored.
Work close-out
Before award, incorporate agreed clarifications into the contract. Reconcile the contract sum to the tender return to avoid scope gaps and document procurement lessons learned.
