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Bid validity keeps a contractor’s tender open for the stated period; bid security supports obligations at the tender stage; performance security covers obligations after award; and a variation order changes work under the awarded contract. The tender documents and contract set the actual periods, amounts, authority and procedures. There is no universal bid-validity duration, performance-guarantee percentage or variation limit established by the sources here. The World Bank rules and examples below provide a useful framework, not a substitute for the procurement regime and contract that govern your project.
What should you check first?
Start with the procurement documents, not a general rule of thumb. Identify the governing procurement law, any lender or funding requirements, the chosen contract form and the project’s particular conditions. A World Bank-funded procurement, for example, may follow World Bank requirements, while another project may be governed by a different regime. The World Bank’s Project Procurement Framework includes regulations, standard documents, guidance and tools; the applicable tender documents specify how those materials operate for a particular procurement.
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Before submitting or administering a tender, find the clauses covering:
- the bid-validity period, when it starts, when it expires and how extensions are requested;
- bid security, including its amount, required form, acceptable issuer, expiry and release terms;
- performance security, including its amount, form, delivery deadline, covered obligations, validity and release or reduction conditions;
- who may issue a variation, what changes are permitted, how price and time are assessed, and what approvals and records are required; and
- the procedures for clarifications, addenda, notices, valuation disagreements and disputes.
Read these provisions together. A bid-validity extension can affect the period for which bid security must remain effective. An award starts a different security obligation. A later change to scope is governed by the contract and procurement regime—not by the fact that a contractor and project representative agree that the work would be useful.
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What is a bid-validity period?
The bid-validity period is the stated time during which a bidder’s offer remains open on the submitted terms. It gives the procuring entity time to compare and evaluate bids, complete required reviews and approvals, and make an award. The tender sets the duration; the sources reviewed establish no single number of days that applies to all construction tenders.
Check how the tender calculates the period. It may state a duration or give a defined expiry date; the documents should make clear what event starts the clock. Record the deadline in the tender register or bid calendar and work backwards from it when tracking evaluation milestones. Do not assume that the period begins on the day you prepare or submit the offer unless the tender says so.
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Bid validity matters to both sides. The bidder needs to know how long it is committing to the submitted price and terms, while the procuring entity needs a valid offer through its award process. An evaluation delay does not, by itself, tell a bidder that its offer or security has been extended. The older World Bank Procurement Guidelines describe the purpose of allowing enough time for evaluation and award; for a current procurement, follow the governing rules and the tender itself.
What should you do when an extension is requested?
Treat an extension request as a formal procurement step. Do not assume that asking for an extension automatically changes the expiry date of the offer or its supporting security. Check the request against the tender’s procedure, respond in the required form and by the stated deadline, and keep the request and response with the procurement record.
- Confirm the current expiry dates. Check the bid-validity period and bid-security expiry against the tender, any addenda and the instrument itself.
- Check the extension instructions. Identify who may request an extension, how the response must be delivered, whether the bidder can accept or decline, and whether the tender specifies the revised period.
- Review the security separately. Confirm whether the bid security must be extended to cover the revised bid-validity period and whether the issuer can provide the necessary amendment in time.
- Respond and document. Make the bidder’s response clear and retain evidence of delivery. A procuring entity should record which bidders responded and whether their required securities remain valid.
- Escalate uncertainty before expiry. If the tender is unclear or the security cannot be extended as requested, seek guidance through the stated procurement channel before relying on an assumption.
Under the September 2023 World Bank Procurement Regulations for IPF Borrowers, bid security is generally to remain valid for four weeks beyond the bid-validity period. That is a rule in the cited World Bank context, not a universal tendering rule. Check the applicable tender and regulation for the actual requirement.
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Where a clarification changes issued procurement documents, the same regulations state: “Any modification to issued Procurement Documents shall be introduced in the form of an addendum which shall be In Writing.” The regulations also call for clarifications and addenda to be in writing and sent simultaneously to the relevant recipients with sufficient time to act. This is a reminder to use the formal channel and written record prescribed by the governing documents—not to rely on an informal conversation as a change to the tender.
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Bid security relates to the tender stage; performance security relates to the successful bidder’s obligations after award. They serve different stages and should be checked as separate instruments, even when both are called a “guarantee” in project correspondence.
| Point to compare | Bid security | Performance security |
|---|---|---|
| When it applies | With the bid and during the period specified in the tender. | After award, for the period and obligations set by the contract. |
| Where to find requirements | Tender instructions and required security form. | Contract conditions, award requirements and required security form. |
| What to verify | Amount, form, issuer, delivery, expiry, extension and release. | Amount, form, issuer, submission deadline, covered obligations, expiry, extension and release or adjustment. |
| What it is not | It is not the successful contractor’s post-award performance security. | It does not automatically replace or retrospectively extend bid security. |
The wording of the instrument matters. Check the named beneficiary, covered event or obligations, effective and expiry dates, amendment process, demand or claim conditions, and any release mechanism against the tender and contract. Do not assume that a security is automatically callable, or that a particular call standard applies: those questions depend on the instrument’s terms and governing law. The World Bank PPP Resource Center’s Construction Contracts Checklist prompts reviewers to examine security wording, release and adjustment provisions, as well as variation arrangements.
How much performance security is required, and how long does it last?
The tender and contract provide the controlling amount and validity period. There is no universal performance-guarantee percentage or standard duration supported by the sources reviewed. One World Bank project procurement document gives an example of performance security at 5–10% of contract price. It is a project-specific example, not a general benchmark or a recommended amount for other contracts.
Check whether the contract expresses the amount as a fixed sum or a percentage, what value the percentage is applied to, and whether a permitted adjustment to the contract price affects the security amount. Confirm the required form and issuer, when the security must be delivered, the obligations it covers and the expiry or extension mechanism. The phrase “how long is a performance guarantee valid?” cannot be answered from the percentage alone: validity is a separate term in the contract and instrument.
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Compare the instrument’s expiry with the relevant contractual milestones stated in your documents. If the contract requires the security to remain effective through a specified period or event, establish who tracks that date and how an extension is obtained. Do not infer that it expires at practical completion, at final payment or at the end of a defects period unless the documents say so. Record release conditions and any reduction or replacement process as carefully as the initial delivery date.
What is a variation order, and what should it specify?
A variation order is a contract mechanism for instructing a permitted change to the work. It is not simply a label for any additional task requested after award. The contract should identify who can issue the instruction, what kinds of change fall within that authority, how the work is valued, how time effects are handled, what notices and records are required, and how valuation disputes are resolved.
Before acting on a proposed change, the contractor and contract administrator should establish:
- Authority: Is the person issuing the instruction empowered under the contract, and are internal or funder approvals also required?
- Scope: Is the change within the contract’s permitted variation mechanism, or does it alter the procurement in a more substantial way?
- Valuation: Do existing contract rates apply? If not, what method supports a new rate, and what substantiation is required?
- Time: How should any effect on completion or other milestones be assessed and recorded?
- Notice and records: What notice, quotation, instruction, measurement or contemporaneous records does the contract require?
- Disagreement: What process applies if the parties cannot agree the price or time effect?
Follow the contract’s written instruction and notice process before undertaking changed work where the contract requires it. Keep the instruction, relevant correspondence, pricing basis, measurements and schedule information together. This creates a record for valuation and time assessment; it does not decide entitlement on its own, which remains dependent on the contract and applicable law.
Is there a standard variation-order limit?
No universal variation-order cap can be stated from these sources. A percentage in a project document may be an approval trigger for that project, rather than a legal ceiling or permission to vary any contract up to that amount.
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For example, a World Bank project procurement document describes a prior-review requirement for certain variation orders or amendments that increase the original contract amount by more than 15%. That figure is project-specific: it does not mean every contract permits a 15% increase without approval, nor that an increase beyond 15% is automatically prohibited. Check the actual project’s procurement plan, approval conditions, contract and applicable rules.
Ask two separate questions: first, what approvals are needed for this change under the project’s internal and funding rules? Second, does the change remain within the original contract and procurement authority? A variation that exceeds that authority or materially changes the original procurement may require additional approvals or a new procurement, depending on the governing regime and circumstances.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When might additional work require a new procurement?
Not every added item of work can safely be treated as a variation. The applicable distinction depends on the contract and procurement framework. The World Bank procurement benchmarking report distinguishes variation orders described as non-substantial changes handled under the contract or legal framework from additional works that may require a new contract and procurement method. The World Bank PPP guidance likewise cautions that substantial modifications can require a new process, subject to context-specific exceptions.
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Before treating extra work as a variation, document why it falls within the contract’s authorized scope and check whether the change affects the nature or substance of what was originally procured. Consider the cumulative effect of related changes, not only the value of the latest instruction, and seek the approvals required by the project. A percentage calculation alone cannot establish that a change is permitted. For a PPP or other specialized regime, apply that regime’s own tests rather than generalizing from a construction contract example.
Where the boundary is uncertain, pause before committing to the additional scope and use the contract’s and procuring entity’s escalation procedures. The correct path may be a permitted variation, a separately approved amendment, or a new procurement; the available sources do not support a universal legal test that determines the answer for every jurisdiction.
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How can teams manage the three issues together?
Use one procurement-to-contract timeline so that tender expiry, securities and later changes are not tracked in isolation.
- At tender issue, set a bid-validity period that allows time for evaluation, reviews, approvals and award under the applicable process. State the start point, expiry and extension procedure clearly.
- At bid submission, check the bid-security form and dates against the tender. Record expiry separately from bid validity and note any extension mechanism.
- During evaluation, monitor both dates. If an extension is needed, use the prescribed written process and confirm the security position rather than assuming it follows automatically.
- At award, identify the successful bidder’s performance-security deadline and verify the instrument against the contract. Record its required amount, validity and release conditions.
- During delivery, maintain a variation log with the instruction, authorized issuer, approval status, valuation, time impact, required notices and supporting records.
- Before approving a material change, check both contract authority and procurement-rule boundaries. Escalate potential substantial changes or additional works before they are instructed.
A useful comparison of two tenders or contract forms should therefore cover time (validity, extensions and security expiry), exposure (amount, obligations and call conditions), control (authorized decision-makers and approvals), valuation (rates and evidence), procurement boundaries, and the governing jurisdiction and funding regime. Those are questions to investigate, not terms that every contract answers in the same way.
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What are the most common avoidable mistakes?
- Using a customary number instead of the tender’s rule. A period or percentage from another project does not set the requirement for this one.
- Confusing security types. Bid security and post-award performance security have different timing and obligations; verify each instrument independently.
- Extending the offer but not checking the security. Confirm whether the security must also be extended and obtain any required amendment in the prescribed form.
- Relying on verbal clarification. Use the formal written clarification or addendum process applicable to the procurement, and preserve the record.
- Treating a review threshold as a variation cap. A prior-review trigger is an approval condition in its specific project context, not general authority to vary.
- Starting additional work on an unclear instruction. Verify authority, notice requirements, price and time procedures, and procurement approvals before proceeding when the contract requires them.
For each issue, the safest operational question is not “What is usual?” but “Which document controls, who has authority, what evidence is required, and by what date?” The answer should be traceable to the tender, contract, security instrument and governing procurement rules.
Frequently Asked Questions
What happens if I do not agree to extend my bid validity?
The outcome depends on the tender’s extension procedure and applicable procurement rules. Review those terms before responding; the available World Bank guidance does not establish a universal consequence for a bidder that declines an extension.
Can a performance guarantee be reduced before it expires?
Only if the contract and security arrangements provide for a reduction or adjustment and their conditions are met. Check whether the contract requires a formal amendment, replacement instrument or approval rather than assuming the amount changes automatically.
Can a site instruction count as a variation order?
That depends on the contract’s definition of a valid instruction, the issuer’s authority and any required form or notice. A site direction alone should not be assumed to satisfy those requirements; verify the relevant clauses and keep the written record.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsDoes a 15% increase mean a project can approve variations below that amount without review?
No. The cited figure is a prior-review condition in one World Bank project document, not a general safe harbor. A project may have other approvals or procurement limits that apply even below that figure.
