Intercon Engineering Pty Ltd v Lend Lease Project Management and Construction (Australia) Pty Ltd; Christopher John Wright v Lend Lease Project Management and Construction (Australia) Pty Ltd

The appeal involved two parties, Intercon Engineering Pty Ltd and Lend Lease Project Management and Construction (Australia) Pty Ltd, along with an individual, Christopher John Wright, who was employed by Intercon. The dispute arose from a construction project where Intercon was a subcontractor to Lend Lease. The primary issue was whether the terms of the head contract between Lend Lease and the main contractor were incorporated into Intercon's subcontract with Lend Lease, specifically regarding the subcontractor's obligations and responsibilities. This question of contractual interpretation and the certainty of the terms was brought before the court.

The court was tasked with determining the precise nature of the contractual relationship between Lend Lease and Intercon. Specifically, the court had to decide if the subcontract between the parties included all terms of the head contract, particularly those that would bind Intercon to the terms of the head contract. The central issue was whether such incorporation would create sufficient certainty in the subcontract, or if it would lead to an uncertain and thus unenforceable agreement. The court needed to clarify whether the subcontract could stand independently from the head contract, or if it required the head contract's terms to be explicitly referenced and incorporated.

In resolving the matter, the court examined the language of both the head contract and the subcontract. It found that while the subcontract did not explicitly incorporate all terms of the head contract, the subcontract did implicitly require Intercon to adhere to the head contract's terms. The court held that the subcontract was sufficiently certain, as the head contract's terms were reasonably ascertainable and could be inferred from the nature of the work and the industry practice. The court emphasised that the subcontract's terms, combined with the head contract, created a binding agreement that was not unacceptably uncertain. The appeal was dismissed, affirming the lower court's decision that the subcontract was valid and enforceable as it stood.

The final orders of the court confirmed that the subcontract between Intercon and Lend Lease was valid and enforceable, and that the subcontract did not need to explicitly incorporate the head contract's terms to be certain. The court ruled that the subcontract's terms, coupled with the head contract, provided sufficient certainty and clarity to the agreement. This decision provided clarity for future construction projects involving subcontractors, ensuring that such agreements could be upheld in the absence of explicit incorporation of the head contract's terms.