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A quick guide to navigating the framework of construction contracts

Construction contracts are the backbone of any building project, acting as the mutual agreement that lays out the responsibilities and expectations of all parties involved. In today's environment, where not only are builders going bankrupt but new builds are falling short of meeting required standards, understanding the framework around construction contracts has become more important than ever. These contracts are carefully crafted agreements that cover the entire scope of work, ensuring clarity and fairness for everyone from the owner to the contractor and subcontractors.

The Structure of Construction Contracts

The complexity of construction contracts mirrors the intricacies of the projects they govern. Each contract is tailored to the project type, whether it's a minor residential renovation or a multimillion-dollar commercial development.

Residential Construction Contracts

When it comes to residential construction, contracts must comply with the Building Act 1993. These agreements range from small job contracts for minor renovations, capped between $5,000 and $20,000, to larger contracts exceeding $20,000 for significant construction or renovations. This delineation ensures that the project's scale is matched with an appropriate contractual framework.

Commercial Construction Contracts

In the commercial sphere, contracts cater to business-related structures, including offices, hotels and entertainment venues. Given the substantial financial stakes, such contracts are scrutinized meticulously to avoid disputes and protect the involved parties' interests.

Types of Construction Contracts

Cost-Plus Contracts

Cost-plus contracts maintain flexibility, with payments based on actual costs plus a defined profit margin. While there is no fixed price, often a cap is set to limit potential expenditures, balancing flexibility with financial prudence.

Lump Sum Contracts

Conversely, lump sum contracts specify a fixed price, creating a clear budget framework but requiring detailed upfront planning and agreement on the project's scope. These contracts put the onus of maintaining the project's costs on the builder, as they will need to avoid unplanned costs from eroding profit margins.

Milestone Contracts

Milestone contracts divide the project into stages, with payments tied to the completion of these defined phases. This structure motivates timely progress and helps manage cash flow.

Key Contractual Elements

Dispute Resolution

A robust construction contract anticipates potential disagreements, outlining resolution methods such as negotiation, mediation, adjudication and arbitration. Litigation is typically a last resort, employed when other avenues fail to yield a resolution.


Projects evolve, and contracts must account for that with variation clauses. These enable adjustments to scope and cost while maintaining contractual integrity. Professional guidance is recommended to navigate the nuances of such changes.

Statutory Warranties

Underlying every construction contract are statutory warranties imposed by laws such as the Building Act 1993. These warranties ensure projects meet specific standards and hold builders accountable for defects.

Liquidated Damages

To address breaches that impact project quality or timelines, liquidated damages clauses provide a predetermined compensation mechanism, helping to offset financial impacts.


Real-world challenges like inclement weather or supply chain issues can necessitate timeline adjustments. Construction contracts should offer provisions for extensions and the right to suspend work if payments are overdue.


Contract suspension is a powerful measure that contractors can leverage, particularly under the Security of Payment Act, when faced with payment disputes. They can serve as a tactical pause, highlighting issues in payment and cash flow that need immediate resolution. Under the Security of Payment Act, a contractor is within their rights to halt work if the builder fails to make due payments. The contractor must wait two business days after the payment deadline before initiating the suspension, giving the builder a narrow window to settle the payment.


In extreme cases, contracts may be terminated due to various factors including mutual consent, frustration or breach. This termination can be a natural conclusion upon satisfactory completion of the project, or it can be invoked under certain conditions that render the continuation of work untenable or undesired by one or both parties. Some of the common grounds for termination are listed below.


The simplest and most straightforward termination occurs when both parties have fulfilled their obligations under the contract. This is the ideal conclusion to a contract where all parties have met the terms, and the project has been completed as specified.

Mutual Agreement

Construction contracts can also be concluded by mutual consent. In this case, both parties agree to discharge each other from the remaining contractual duties, often necessitating negotiation to reach an amicable arrangement that may involve compensatory measures.


Frustration of purpose occurs when an unexpected event fundamentally changes the circumstances of the contract, making it impossible to fulfil its original intent. Such an event must be external, unforeseeable and not attributable to either party. If frustration is claimed, it often requires legal examination to validate the claim and proceed with termination.

Contract Breach

Breach of contract is a common ground for termination. This occurs when one party fails to meet their contractual duties, especially if those duties are critical to the project's success. The non-breaching party must decide whether to terminate the contract and seek damages or to engage in a resolution process to address and rectify the breach.


Construction contracts are complex, and their preparation should not be taken lightly. Legal professionals specialised in construction law can provide invaluable assistance in drafting, reviewing, and if necessary, litigating the terms and conditions of these critical agreements. Ensuring a fair and comprehensive contract not only protects all parties involved but also provides a solid foundation for a successful construction project.

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