Again, the contract should be checked for change in law provisions, as these may allow a contractor to claim costs if specific legislative measures enacted as a result of the pandemic have caused additional costs. The success of a change in law claim will depend on the specific facts, and how the additional costs arise and are presented.
Civil law systems
Civil law systems may provide for additional remedies in relation to costs as a matter of law. These should be borne in mind when raising claims for additional cost as a result of the pandemic.
As with common law systems, the starting point for costs claims will be what is provided for in the contract. If there are no express provisions, the breach of contract argument applicable in 'constructive acceleration' causes may also be available in civil law systems. The obligation of 'good faith' contained in certain civil codes may provide a further legal basis here, if the contractor can show that it informed the employer of the impact suffered, the need to accelerate at the employer's cost if the employer intends to enforce the original completion date, and the estimated cost of such acceleration.
Change in law claims may also arise, and can be relied on where the contract contemplates cost claims for changes in law. These would be subject to the same need to show that the costs are the result of the specific legislative measures relied on.
Finally, the main difference from a common law system is that a number of civil law systems also recognise the possibility of reducing an excessively onerous obligation or of restoring the 'lost' economic balance of the contract, where either of these was caused by unforeseen circumstances. The French legal system refers to this as the doctrine of 'imprévision' which, since 2016, has been governed by the French Civil Code. The UAE Civil Code contains similar provisions, allowing a judge or arbitrator to reduce an onerous obligation to a reasonable level if an unforeseen exceptional circumstance has made that obligation become excessively onerous and the person with the obligation is threatened with "grave loss".
Requirements specific to each legal system will need to be met before such provisions apply, and these should be checked in detail. In some cases, the test is quite high.
Causal link or causation
Regardless of the applicable type of law, any time and costs claimed have to be traceable to or linked to the event relied on as basis for the entitlement. The necessary link between cause and effect cannot be underestimated even in the context of an event as seemingly obvious as the Covid-19 pandemic.
Obligation to mitigate
Parties to a construction contract are required to mitigate any damages or loss arising from the Covid-19 pandemic as far as possible.
In common law systems – and certainly in England and South Africa – there is an obligation to mitigate. A similar obligation also applies in civil law. The difference is in the origin of the obligation.
In England and South Africa, the obligation to mitigate applies as a common law principle adopted in the measure of loss: the failure to reasonably mitigate losses will be taken into consideration in the ultimate measure of loss or damage, which is applicable to all monetary claims. In some civil law systems, the obligation arises from the wider - and mandatory - obligation to act in good faith.
In both systems, the exact scope of the obligation to mitigate will be defined by reference to the specific facts, the cost of the mitigation measures when referenced against the potential loss, the market conditions, etc. Best practice when putting forward a claim is to show that mitigation measures have been considered.
Standard of proof
The standard of proof is the level or degree of proof that the judge or arbitrator will require in relation to causation and quantum if a claim was brought before them.
In common law jurisdictions, the standard of proof that has to be met is the balance of probabilities: that is, that it is more likely than not that the delay or cost has been caused by the event relied on. In most civil law jurisdictions, there is no defined standard and judges and arbitrators have more discretion, which may lead to a stricter standard than that applicable under common law.
In international arbitration, even if civil law applies, arbitrators may be influenced by the common law standard and, if the underlying legal system gives them that discretion, they may apply a 'balance of probabilities' approach.