When may a contractor recover acceleration costs, and what is constructive acceleration?
Acceleration cost is recoverable where the contract or an agreement provides for it, or where proven employer's breach causes the contractor reasonably to incur acceleration expenditure. Constructive acceleration is not an automatic label for every refusal of an extension.
Recoverability depends on contractual authority, agreement or a proved breach causing reasonable acceleration cost
If the contractor is behind through its own risk, it may be required to recover progress under the contract without additional payment. Bringing forward completion or overcoming employer-risk delay usually requires an express mechanism or agreement. A constructive-acceleration case may arise where the contractor is entitled to time, gives the required notice, the extension is wrongly withheld or delayed, the employer still requires the unadjusted date, and reasonable additional resources are incurred. Each element and the causal cost must be proved.
| Issue | Position |
|---|---|
| Contractor-risk recovery | Usually contractor cost unless the contract says otherwise |
| Agreed acceleration | Define measures, date, price and risk allocation |
| Employer-risk delay | Extension and cost routes apply |
| Constructive acceleration | Potential breach-damages analysis, not automatic entitlement |
| Quantum | Compare no-acceleration resources with actual measures |
Separate recovery from acceleration
Recovery measures restore progress lost through contractor-risk events. Acceleration changes the planned rate or sequence to achieve an earlier result or overcome excusable delay. The same additional labour may appear in both, but entitlement differs.
Express instructed acceleration
A contract may empower a decision-maker to request a quotation, instruct measures or agree an earlier date. Apply the required proposal, acceptance, programme and valuation process before committing substantial cost.
Record the target date, measures, assumptions, price, effect on extensions, productivity risk and consequences if the target is not achieved.
Contractor-risk delay
Where progress is insufficient because of contractor's default, the contract may require additional resources to meet the existing completion date without payment. The contractor may compare recovery cost with delay-damages exposure, subject to its continuing performance obligations.
Employer-requested earlier completion
Bringing the date forward is a variation of risk and price unless an existing clause supplies the mechanism. Contractor agreement is ordinarily required where the contract does not confer a unilateral power.
What constructive acceleration describes
The expression describes a breach-damages case in which the contractor is contractually entitled to time, but the employer fails to recognise it while insisting on the unchanged date, causing reasonable acceleration expenditure. The legal basis remains the contract and proved breach.
Overseas authorities
Constructive acceleration required a proved owner's breach and proof of additional expenditure incurred to complete on time.
Extensions were deliberately refused, and damages were measured by the additional expense of accelerated completion.
Damages were awarded where the employer stated that no extension would be granted and acceleration followed.
Motherwell Bridge
There was additional welding, an entitlement to more time, and a failure to grant it. The subcontractor recovered acceleration cost incurred in attempting to meet the original date.
Entitlement evidence
| Element | Evidence |
|---|---|
| Excusable delay | Event and extension entitlement under the contract. |
| Notice | Compliant notice, particulars and extension application. |
| Decision failure | Refusal, under-award or unreasonable failure to decide. |
| Completion demand | Evidence that the unchanged date remained required. |
| Reasonable response | Why acceleration was selected and alternatives considered. |
| Reservation | Contemporaneous statement that cost and time rights were maintained. |
Quantum evidence
| Element | Evidence |
|---|---|
| No-acceleration plan | Resources and completion date with the extension due. |
| Acceleration plan | Extra shifts, labour, plant, supervision and resequencing. |
| Actual records | Hours, cost, productivity and dates by activity. |
| Inefficiency | Congestion, fatigue, stacking and out-of-sequence effect. |
| Savings | Shorter duration, avoided preliminaries and reduced damages. |
| Other causes | Remove contractor recovery and unrelated disruption. |
Acceleration versus disruption
Acceleration cost includes additional resources and productivity loss caused by their deployment. Disruption may arise without an acceleration objective. Keep the causal narratives and valuation methods separate, then remove overlapping labour or inefficiency.
Practical sequence
Identify the current completion obligation and delay responsibility.
Secure an acceleration instruction or written agreement where possible.
If time is withheld, preserve the extension application and completion demand.
Prepare no-acceleration and acceleration resource plans.
Record resources, shifts and productivity by activity.
Quantify incremental cost and all savings.
Separate acceleration, recovery and disruption claims.
Authorities
| Authority | Year | What it decides |
|---|---|---|
| Perini Corporation v Commonwealth of Australia | (1969) 12 BLR 82 | Proved breach and additional acceleration expenditure were required. |
| Morrison-Knudsen Co Inc v British Columbia Hydro and Power Authority | (1978) 85 DLR (3d) 186 | Deliberate extension refusal supported the recorded acceleration damages. |
| W Stephenson (Western) Ltd v Metro Canada Ltd | (1987) 27 CLR 113 (BCSC) | A refusal to grant any extension supported the recorded damages claim. |
| Motherwell Bridge Construction Ltd v Micafil Vakuumtechnik | (2002) 81 Con LR 44 | Acceleration cost followed failure to grant time due for added work. |