House Plans and Copyright: What the 2026 Hamlan Homes Decision Means for Australian Builders

When two residential builders go head-to-head in court over house plans, the outcome matters for every builder in Australia. Hamlan Homes Pty Ltd v Levonix Homes Pty Ltd (No 4) [2026] FedCFamC2G 222, decided in February 2026, is one of the most recent Federal Circuit and Family Court decisions addressing copyright protection in residential house plans — and it reinforces a message that the building industry cannot afford to ignore: copying a competitor's house plans is a serious copyright infringement.

Background

Hamlan Homes Pty Ltd, trading as Hamlan Homes and Geelong Homes, is a residential builder that invests substantial time and creative effort in developing its house plan portfolio. Like most builders, Hamlan's business value is tied directly to its designs — the floor plans, elevations, and layouts that it markets to prospective homeowners. Those plans are the product of its draftspersons' skill and labour, and they are protected by copyright from the moment they are created.

Levonix Homes Pty Ltd was alleged to have copied Hamlan's house plans and used them as the basis for its own homes — both in marketing materials and in actual construction. The case proceeded through multiple interlocutory stages before the No 4 decision in early 2026, making it the latest chapter in a dispute that illustrates how fiercely builders protect their intellectual property.

The Legal Framework: Copyright in House Plans

Under the Copyright Act 1968 (Cth), copyright arises automatically in original works — no registration is required. Architectural drawings and house plans are protected as artistic works under the Act. This means that from the moment a draftsperson puts pen to paper (or mouse to screen), copyright subsists in those plans.

What Counts as Infringement?

Section 36 of the Copyright Act provides that copyright is infringed when a person, without the licence of the copyright owner, reproduces a substantial part of a copyright work. Critically, the "substantial part" test is qualitative, not merely quantitative. A court will ask whether the part copied is important or distinctive — not simply whether it is large. This means that even copying the most recognisable or commercially valuable elements of a floor plan can constitute infringement, even if the overall square meterage borrowed is limited.

There is a further dimension unique to architectural works: under section 21 of the Copyright Act, making a three-dimensional building from a two-dimensional plan is itself an act of reproduction. So infringement occurs at two points — when the plans are copied, and again when the building is constructed from those copied plans.

No Registration Required — But Evidence Matters

Because copyright arises automatically, builders do not need to formally register their plans with any government body. However, evidence of creation is critical. In litigation, a builder must be able to demonstrate when and how the plans were created, who created them, and that the plans are original works. This means maintaining file metadata, employment records for draftspersons, version histories, and dated project files.

Key Legal Issues Engaged by This Case

Substantial Part: Quality Over Quantity

The central question in any building plan copyright dispute is whether the defendant reproduced a substantial part of the plaintiff's work. Courts look at the distinctive elements — the elements that make the plaintiff's design recognisable and commercially valuable. A builder who takes inspiration from a competitor's general concept may not infringe; a builder who copies the distinctive layout, room configurations, and proportions almost certainly does.

Licence and Authorisation Defences

Defendants in building plan cases frequently argue that they had some form of licence — express or implied — to use the plans in question. Courts scrutinise these arguments carefully. An implied licence to use plans is narrow: it generally extends only to the specific purpose for which the plans were provided, and no further. A competitor who has never had any commercial relationship with the copyright owner has no basis for a licence defence.

Damages and Account of Profits

Where infringement is established, a copyright owner may elect between damages (compensating for loss caused by the infringement) or an account of profits (requiring the infringer to disgorge profits made from the infringing conduct). In the building industry, where homes may be sold for hundreds of thousands of dollars, this election can result in very substantial awards. Courts may also award additional damages under section 115(4) of the Copyright Act where the infringement is flagrant — particularly where a commercial competitor deliberately copies designs to gain a competitive advantage.

Why This 2026 Decision Matters

The Hamlan v Levonix litigation is significant for several reasons. First, it is one of the most recent decisions in this space — practitioners and builders alike should monitor its outcomes as the jurisprudence on residential building copyright continues to develop. Second, it demonstrates that copyright enforcement in the building industry is alive and active. Established builders are willing to invest in litigation to protect their plan libraries, and courts are receptive to these claims.

Third, and perhaps most importantly, the case is a reminder that the building industry is not exempt from intellectual property law. In a competitive market where builders differentiate themselves through design, the temptation to borrow from a rival's catalogue can be strong — but the legal consequences are severe.

Strategic Takeaways for Builders and Developers

• Document your creation process. Maintain version histories, file metadata, and records of who created your plans and when. Evidence of creation is your most important asset in copyright litigation.

• Never copy a competitor's plans. Even partial copying of distinctive layouts can constitute infringement. If you want to be inspired by a design, start from scratch with your own draftsperson.

• Use written agreements with draftspersons. If plans are created by an independent contractor rather than an employee, ensure your contract expressly assigns copyright to your company. Otherwise, copyright may vest in the contractor.

• Act quickly if you suspect copying. Copyright owners who delay in enforcing their rights can face procedural disadvantages. Monitor the market for designs that look suspiciously similar to yours.

• Seek legal advice before using any third-party plans. Even if you believe you have a licence, confirm its scope in writing before using plans for purposes beyond their original intent.

Conclusion

House plans are copyright works, full stop. Copying them — whether in the planning stage or by constructing buildings that replicate protected designs — is infringement that can result in injunctions, substantial damages, and an account of profits. The Hamlan v Levonix decision in early 2026 is a timely reminder that the residential building industry operates within a robust intellectual property framework.

If you are a builder, developer, or architect with questions about copyright protection for your designs, or if you believe your plans have been copied, Stellar IP Law can help. Contact our team today for expert advice tailored to the building and construction industry.