Clauses on Changes, Delays and Extensions of Time

Overview
In construction and project contracts, three groups of clauses decide who carries time and cost risk once work begins: changes (variations), delays, and extensions of time (EOT). For the PMI Construction Professional (PMI-CP) exam, you need to understand how these clauses work, why they exist, and how a project manager should apply them in realistic situations.

Why These Clauses Are Important
Construction projects almost never run exactly as planned. Typical disruptions include:

• Design changes
• Unforeseen site conditions
• Late owner-supplied information
• Bad weather
• Regulatory changes
• Supply chain disruption

Without clear contract clauses, each of these turns into a dispute. These clauses matter for five reasons:

• Allocate risk: They set out who bears the time and cost consequences of each type of event.
• Protect the owner's rights: Without a valid EOT mechanism, an owner who causes delay can lose the right to apply liquidated damages. This is the prevention principle, under which time can become 'at large'.
• Protect the contractor: They give the contractor a fair route to more time and money for events it did not cause.
• Enable control: They feed integrated change control, schedule baselines, cost forecasts and claims management.
• Reduce disputes: Clear notice, documentation and valuation rules prevent escalation to arbitration or litigation.

What These Clauses Are
1. Change (Variation) Clauses
A change clause lets the owner, usually through an authorized representative such as the engineer or contract administrator, alter the scope, quality, quantity, sequence or timing of the work without breaching or voiding the contract. Key elements are:

• Authority: who may instruct a change. Only authorized persons can bind the owner.
• Form: written instruction or change order. Some contracts also recognise a change directive issued when price and time have not yet been agreed.
• Scope limits: changes must be within the general scope of the contract. A change that fundamentally alters the bargain is a cardinal change and may be a breach.
• Valuation: methods include contract rates, fair rates, agreed lump sums, cost-plus, or unit prices.
• Time impact: the change may carry an adjustment to the completion date.
• Constructive change: an owner action or instruction that has the effect of a change without a formal change order. Examples are over-strict inspection, defective specifications, or a directed acceleration.

2. Delay Clauses
Delay clauses classify delays and set the remedy for each class:

• Excusable and compensable: caused by the owner or owner-side risk, such as late access, late drawings, owner changes, or suspension. The contractor gets time and money.
• Excusable and non-compensable: neutral events such as force majeure or exceptionally adverse weather. The contractor gets time only, with no money.
• Non-excusable: caused by the contractor, such as poor productivity, subcontractor failure, or late procurement. There is no time and no money, and the contractor may pay liquidated damages.
• Concurrent delay: two or more delays occur in the same period, at least one by each party. The treatment depends on the contract and jurisdiction. Common outcomes are time but no money, or apportionment.

Related provisions include:

• Liquidated damages (LDs): a pre-agreed sum per day or week of contractor-caused delay.
• No-damages-for-delay clauses: these limit the contractor to time only.
• Suspension of work clauses
• Force majeure clauses

3. Extension of Time (EOT) Clauses
An EOT clause lets the completion date be extended for qualifying events. This relieves the contractor from LDs for that period and keeps the owner's right to LDs intact for any remaining culpable delay. Typical features are:

• A list of qualifying 'relevant events'
• Notice requirements, often a strict time bar such as within 28 days of becoming aware
• Submission of particulars and supporting schedule analysis
• A decision by the contract administrator within a set period
• Interim and final EOT assessments
• A contractor duty to mitigate delay

How It Works: The Typical Process
Step 1 – Identify the event. The project team recognises a change instruction, a risk event, or a delay. Early warning clauses, such as the NEC early warning, encourage prompt raising of issues.

Step 2 – Give notice. The contractor issues written notice within the contractual period. Many contracts make notice a condition precedent: missing the deadline can forfeit the entitlement.

Step 3 – Document and record. Keep contemporaneous records:

• Daily reports and diaries
• Correspondence and RFIs
• Photographs
• Resource records
• Updated schedules

Step 4 – Analyse impact.

• Time: use schedule delay analysis methods such as time impact analysis (TIA), windows analysis, as-planned vs as-built, or collapsed as-built. Only delay to the critical path, or delay that consumes all available float, normally earns an EOT. Float ownership, meaning who may use the float, should be defined in the contract.
• Cost: use contract rates, actual cost plus markup, prolongation costs, and disruption or loss of productivity claims.

Step 5 – Submit the claim or change proposal. Present entitlement (the contract clause relied on), causation, quantum (money), and time.

Step 6 – Evaluate, negotiate and decide. The owner or contract administrator assesses the claim, negotiates, and issues a change order or EOT award. If agreement fails, the matter goes to the dispute resolution clause. Typical steps are negotiation, mediation, a dispute board, adjudication, and then arbitration or litigation.

Step 7 – Update baselines. Through integrated change control, update the scope, schedule and cost baselines, then communicate to stakeholders and subcontractors. Flow-down clauses pass the obligations down the supply chain.

Delivery Method Considerations
The delivery method and contract type affect how much change and delay risk each party carries.

• Design-Bid-Build (DBB): the owner owns the design, so design errors typically lead to owner-compensable changes.
• Design-Build (DB): the contractor carries design risk, so fewer owner changes are expected. Changes to the owner's requirements are still compensable.
• CM at Risk / GMP contracts: changes are managed against the GMP. Contingency use rules matter.
• Integrated Project Delivery (IPD): risk is shared, and change and delay impacts are often absorbed through a shared risk/reward pool.
• Fixed price / lump sum: the contractor carries most risk unless a change clause applies.
• Cost-reimbursable: the owner carries more cost risk. Changes are still controlled.
• Standard forms: FIDIC, NEC and AIA/ConsensusDocs each have distinctive mechanisms. Examples:
  • FIDIC uses a 28-day notice period for claims.
  • NEC uses compensation events and early warnings.
  • AIA distinguishes change orders, construction change directives and minor changes.

Key Concepts to Memorise

• Change order: a bilateral, agreed change to scope, price and time.
• Change directive: a unilateral instruction to proceed. Price and time are agreed later.
• Constructive change: an informal change implied by owner conduct.
• Cardinal change: outside the contract scope. It can be treated as a breach.
• Critical path: only critical delays extend completion.
• Float: its ownership affects entitlement.
• Time bar / condition precedent: late notice can kill a claim.
• Prevention principle: an owner cannot benefit from its own delay.
• Acceleration: may be directed by the owner (compensable) or constructive, when the owner refuses a valid EOT and still demands the original date.
• Mitigation: parties must take reasonable steps to reduce the impact.
• Global claims: claims that do not link causes to effects. They are generally weak and discouraged.

Exam Tips: Answering Questions on Clauses on Changes, Delays and Extensions of Time

• 1. Go back to the contract first. When a scenario asks what the project manager should do FIRST, the best answer is usually to review the contract terms: the change clause, notice requirements, and the EOT provisions. Avoid answers that act on assumptions or verbal agreements.
• 2. Notice is king. If an event may affect time or cost, the correct action is usually to issue timely written notice per the contract, even before the full impact is known. Watch for time-bar traps.
• 3. No written authorization, no change. Answers where the contractor performs extra work on an unauthorised verbal instruction from a site person are usually wrong. Choose options that confirm authority and obtain a written change order or directive.
• 4. Classify the delay. Ask who caused it. Owner-caused means time plus money. A neutral event means time only. Contractor-caused means nothing, plus LDs. Concurrent delay often means time but no money, unless the contract says otherwise.
• 5. Critical path test. If the delayed activity has float and the delay does not exceed it, an EOT is generally not justified. Look for schedule analysis answers such as time impact analysis.
• 6. Integrated change control. After approval, update the baselines, plans and stakeholder communications. The PMI framing favours a structured process over ad hoc fixes.
• 7. Document everything. Choose answers that emphasise contemporaneous records, a change log, a claims register, and an updated schedule.
• 8. Prefer collaborative resolution. When there is disagreement, the best next step is usually negotiation under the contract's dispute resolution ladder. Jumping straight to litigation or stopping work is rarely correct.
• 9. Continue work. Most contracts require the contractor to proceed with the work while a change is being valued or a dispute is resolved. Answers that suspend work unilaterally are typically wrong.
• 10. Mitigate. Expect correct answers to show reasonable steps to reduce delay and cost, such as resequencing or adding resources where appropriate.
• 11. Recognise acceleration and prevention. If the owner refuses a valid EOT yet enforces the original date, think constructive acceleration. If the owner caused delay and no EOT mechanism exists, think prevention principle and time at large.
• 12. Link to the delivery method. In design-build, design errors are the contractor's problem. In DBB, they are the owner's. Under a GMP, check contingency and allowance rules before raising a change.
• 13. Flow down. Ensure subcontract notice periods are shorter than the main contract's, so the contractor can meet its own obligations.
• 14. Eliminate extremes. Discard answers that are absolute, unilateral or emotional. Choose the one that is contractual, documented, timely and collaborative.

Worked Example
Scenario: The owner's engineer issues revised drawings three weeks late. The affected activity is on the critical path. The contractor's site manager verbally tells the engineer the project will be late. What should the project manager do next?

Analysis: The cause is owner-caused, so the delay is excusable and compensable. The activity is critical, so an EOT is likely warranted. A verbal comment is not contractual notice.

Best answer: Issue formal written notice of delay under the contract within the required period. Then prepare a time impact analysis and a cost substantiation for an EOT and compensation claim, while continuing work and mitigating.

Summary
Change, delay and EOT clauses are the contract's built-in tools for handling the unexpected:

• Change clauses let scope evolve lawfully.
• Delay clauses classify responsibility.
• EOT clauses adjust the completion date fairly and preserve LD rights.

On the PMI-CP exam, consistently favour answers that:

• Follow the contract
• Give timely written notice
• Use proper authority
• Rely on schedule analysis based on the critical path
• Maintain documentation
• Update baselines through integrated change control
• Resolve issues collaboratively