REALWorld Law

Construction

Variations

How are variations to the specification for engineering or construction works normally dealt with?

Belgium

Belgium

A modification or alteration of the specification of an engineering or construction contract can only occur by contractual agreement between the parties. A change in the scope of the specification (for example where the extent of the works is increased or decreased) will commonly be contractually determined in engineering and construction contracts relating to major projects.

Where there is no contractual arrangement concerning a variation, and where the specification of an engineering or construction contract is unilaterally and to a major extent varied by the principal, Article 1794 of the Belgian Civil Code may apply. This article places an obligation on the principal in the event of a unilateral termination of a contract for the delivery of work, in order to compensate the contractor (ie the engineer or the contractor) for his expenses, his work and all that he could have earned if the contract had not been terminated.

In the context of a public contract, modifications are only permitted in so far as these are not material. A modification is material if:

  • The modification introduces conditions which, had they been part of the initial procurement procedure, would have allowed for the admission of other candidates than those initially selected or for the acceptance of a tender other than that originally accepted or would have attracted additional participants in the procurement procedure;
  • The modification changes the economic balance of the contract in favour of the economic operator in a manner which was not provided for in the initial contract or framework agreement;
  • The modification extends the scope of the contract considerably

(see in this regard articles 38/2 et seq. of the Royal Decree of 14 January 2013 on the general execution rules of public contracts).