Material approvals, nominated suppliers and ‘or equal’: procurement clauses that can erase tender savings

A tender can appear vendor-neutral while the approval mechanism effectively locks the contractor into a short supplier list. Phrases such as 'or approved equal' are only commercially useful if the approval criteria, review time and technical equivalence process are workable. If the Employer can reject alternatives without objective criteria, the bidder should not price the cheapest technically plausible source and assume approval later.

Nominated suppliers create a different issue: the contractor may carry schedule, interface, payment or warranty responsibility for a supplier it did not select. The tender review should identify who contracts with the supplier, who pays, who controls delivery, who bears delay, who owns design coordination and who carries warranty/performance responsibility.

Material approvals also consume programme float. Samples, mock-ups, factory documents, type tests and source inspections can require multiple review cycles. Long-lead equipment should therefore have an approval allowance in the procurement schedule, not only manufacturing and shipping durations.

A robust bid records the priced manufacturer, approved alternatives, deviation status, required submittals, expected approval duration and commercial consequence if the preferred source is rejected. This converts 'material approval risk' from a vague contingency into a controlled procurement assumption.

This article is engineering and tender-risk guidance. The signed bidding documents, conditions of contract, technical specifications, drawings, bill of quantities, method of measurement and applicable law govern each project. Contractual and legal interpretations should be confirmed by qualified advisers where material.