The variation has blown out the budget by $200,000. The builder claims the delay is your fault. The contract is silent on whether the new requirement is a variation or part of the original scope. You’re being told the project is “near completion” but defects are mounting, and the builder is demanding the next progress payment.
Building contracts in NSW are commercially complex, technically detailed, and tightly contested. A dispute mid-project can derail an entire build, costing months, hundreds of thousands of dollars and significant stress for both sides. The right legal advice early often resolves the dispute before it escalates; the wrong approach can lead to termination, lawsuits, and years of recovery work.
Citilawyers acts for homeowners, builders, developers, project managers, and owners corporations in building contract disputes across Sydney and New South Wales. We advise on the interpretation of standard form and bespoke construction contracts, including: HIA, Master Builders Association (MBA), AS4000, AS4902, AS2124 and AS4905 contracts, and on the full range of disputes that arise during a residential or commercial construction project.
For the full range of building and construction legal services we provide, including NCAT proceedings, defective work claims, and Home Building Act disputes, see our building and construction lawyers page.
Contact our Sydney building contract lawyers as soon as one or more of the following applies:
The earlier you obtain legal advice, the more options remain. By the time termination has been threatened or executed, the cost of resolution has typically multiplied.
Most building contract disputes fall into one or more of the following categories:
Disputes about whether work is a variation (chargeable extra) or part of the original scope. Variations are one of the most contested areas of NSW construction law. Disputes often turn on whether the variation was approved in writing as required by the contract, whether the variation is properly priced, and whether the variation actually represents additional work.
Whether the builder is entitled to extensions of time for weather, variations, or owner-caused delays. Where extensions are not granted, the builder may be liable for liquidated damages under the contract for late completion. Where extensions are valid, liquidated damages claims may be defeated.
Disputes about whether claimed payments are due, whether the work has been performed to the contract standard, and whether retention amounts can be withheld. For Security of Payment Act claims specifically, see our Security of Payment lawyers page.
Disagreements about what work the contract requires. Scope disputes often arise where plans and specifications are ambiguous, where the contract is incomplete, or where verbal instructions during the project conflict with written specifications.
Disputes about whether the work has been performed to contract standards (which include the statutory warranties under the Home Building Act 1989 (NSW) for residential work). For defective work claims specifically, see our defective building work claims lawyers page.
Disputes about whether practical completion has been achieved, whether defects need to be rectified before completion, and what the consequences of completion are for the parties’ obligations.
Whether one party has properly suspended work under the contract or whether suspension amounts to repudiation.
Whether grounds exist to terminate the contract, whether the proper notice procedures have been followed, and what the consequences of termination are for unpaid work, materials on site, and damages.
Where owner-builders engage trades directly, the contract framework is different; see our article on owner builder projects in NSW.
Variations are the largest single source of building contract disputes in NSW. The general rule across standard form contracts is that:
In practice, projects rarely follow these rules strictly. Builders often perform work on verbal instructions or implied agreement. When disputes arise, the parties must resolve whether the work is:
The dispute typically requires careful analysis of the contract, the plans and specifications, written correspondence, drawings, and the actual work performed. Expert evidence is often required.
Standard form construction contracts include provisions for extensions of time (EOT). The builder is entitled to extensions for matters outside their control, including:
Where extensions are not granted (or not claimed correctly within the contractual time limits), the builder may be liable for liquidated damages (LDs); a fixed daily or weekly amount specified in the contract for each day completion is late.
Disputes about EOTs and LDs are technical, fact-heavy, and turn on:
Failing to comply with EOT notice provisions is one of the most common ways builders lose entitlement to extensions they were otherwise entitled to.
Termination of a building contract is one of the most serious decisions either party can make and one of the easiest to get wrong. Wrongful termination is itself a repudiation, meaning the terminating party becomes liable for damages instead of the other party.
Building contracts can be terminated in several ways:
Termination under the contract: Most standard form contracts contain termination clauses requiring written notice of breach, opportunity to remedy (typically 10-14 days), and a further notice of termination if the breach is not remedied. The procedure must be followed strictly.
Termination for repudiation: Where one party demonstrates by words or conduct that they will not perform their fundamental obligations, the innocent party may accept the repudiation and terminate at common law. This requires careful judgment — what looks like repudiation may not be.
Termination by mutual agreement: The cleanest path, where parties agree to end the contract on agreed terms. We frequently negotiate exit deeds settling all outstanding entitlements.
Termination under statute: In limited circumstances, statutory rights of termination exist. For example, where a builder’s license is suspended or cancelled.
Before terminating, always obtain legal advice. The consequences are significant: claims for the remaining contract price, damages for delay and additional cost of completion, retention recovery, security on materials and equipment on site, and potential claims under the Home Building Act for incomplete or defective work.
For broader contract law principles applicable to termination, see our contract dispute lawyers page.
The cheapest building contract dispute is the one avoided by reviewing the contract before signing. Before entering into a building contract, we recommend a legal review covering:
For homeowners, the most common pre-construction risk is signing a HIA or MBA contract without understanding what they are agreeing to, including: variation procedures, latent condition risk, and the scope of “prime cost items” and “provisional sums” that often expand significantly during construction.
For builders, the most common risk is accepting a heavily principal-favourable bespoke contract drafted by the principal’s lawyers, with no negotiation of terms.
In NSW, the Home Building Act 1989 requires residential building work over $5,000 (including GST) to be done under a written contract. Work over $20,000 needs a full major work contract and Home Building Compensation (HBC) insurance. Builders cannot take a deposit of more than 10%. A contract that misses these requirements puts the builder’s payment at risk.
For a review of your standard terms, we check deposit and progress payment triggers, the variation procedure, delay and suspension rights, defects and warranty clauses, and limitation of liability.
Builders: call (02) 9233 7737 for a free initial phone consultation about your contract terms or an unpaid progress claim.
Our approach to building contract disputes prioritises:
Most building disputes are easier and cheaper to resolve early. We aim to resolve disputes before the next progress claim, before practical completion is disputed, or before termination is threatened.
Building disputes are usually resolved through negotiation, mediation, or expert determination — not court. We focus on outcomes that preserve the commercial relationship where possible and protect our client’s position where it cannot.
Where formal action is needed, we act decisively, whether that means making or defending Security of Payment Act claims, lodging NCAT applications, or commencing Supreme Court proceedings. For NCAT building disputes specifically, see our NCAT building disputes lawyers Sydney page.
We act for both homeowners and builders. That dual perspective matters when we advise a claimant; we know exactly what the respondent will argue, and vice versa.
For post-completion defect claims, see our Home Building Act disputes lawyers page. For payment disputes under construction contracts, see our Security of Payment lawyers page, including our guide on what constitutes a valid payment claim under the SOP Act.
Our Sydney building contract lawyers act for clients throughout Sydney and across New South Wales, including Parramatta, Chatswood, North Sydney, Liverpool, Penrith, Ryde, Bondi Junction, Inner West, Sutherland Shire, Hornsby, Burwood, Bankstown, Manly, and Newtown, as well as on construction projects throughout regional NSW.
We act on residential and commercial construction matters across the full range of standard form contracts and bespoke contract types.
If you have a building contract dispute, are considering termination, are facing a variation or EOT dispute, or want a contract reviewed before signing, contact Citilawyers today. Early intervention significantly improves outcomes.
Call (02) 9233 7737 for a free initial phone consultation.