A new Part of the Building Act 1993 puts certification duties on manufacturers and makes the building surveyor the checkpoint
Victoria has legislated a regulatory framework for prefabrication that does not exist anywhere else in Australia. Prefabrication work becomes its own category of building work. Prefabrication builder becomes its own category of registered building practitioner. And a documentation chain now runs from the factory to the site to the building surveyor, with the permit as the enforcement point.
It passed with almost no attention, because it was not in a building bill. The provisions were moved as amendments in the Legislative Council to the Consumer Legislation Amendment Bill 2026, a consumer omnibus otherwise concerned with estate agents, owners corporations and debt collection. Both Houses have now passed it. Royal Assent has not been recorded, so it is not yet law.
For anyone manufacturing or installing offsite product, this is the most consequential thing to happen in Australian prefab regulation this year, and it will not commence for some time. Both of those facts matter.
What the new Part 2A does
The Act inserts a new Part 2A into the Building Act 1993 headed Prefabrication work. It does four things.
First, it defines the territory. Prefabrication work means making or manufacturing a prefabricated building system somewhere other than the land where it will be used, or assembling two or more such systems somewhere other than that land. A prefabricated building system is either a module or a building component.
Second, it creates offences. A person must not make, manufacture or assemble a prescribed prefabricated building system for use in a building where that use will not comply with the Act, the building regulations, the plumbing laws, any binding determination and the Electricity Safety Act. A parallel offence covers systems made by a prescribed method. A third covers prefabrication work where electrical or plumbing work is done alongside it and does not comply.
Third, it creates a documentation duty. A registered prefabrication builder supplying a specified system must send it out with written information on intended use and any limits on that use, written certification that the system complies with the building regulations when used as instructed, electrical and plumbing compliance certificates where those are required, transport and handling instructions, and instructions for use.
Fourth, it makes the building surveyor responsible for checking that chain holds.
What counts as a prefabricated building system?
A module is a three dimensional structure that includes at least one building component when used in construction. A volumetric bathroom pod or a complete modular room is a module.
A building component is narrower and more interesting. It is a thing that forms part of a building element, and that cannot be inspected once installed without opening it and damaging it, or without testing likely to destroy it. A closed wall panel with the lining already on qualifies. An open frame delivered to site does not.
A building element includes load bearing components essential to stability, the building enclosure separating inside from outside, waterproofing, fire safety systems, and mechanical, plumbing, electrical or vertical transportation services required for compliance with the National Construction Code.
The logic is inspectability. The provisions attach to the things a surveyor can no longer see once they arrive on site.
The documentation chain is the actual mechanism
The offences will get the attention. The permit provisions are what will change behaviour.
A relevant building surveyor must not issue a building permit for work that includes an affected prefabricated building system unless satisfied the application contains enough information to show that the person named as builder on the permit will be given the documents from the registered prefabrication builder. At the other end, a surveyor must not issue an occupancy permit unless they have actually seen those documents.
That is a checkpoint at each end of the job, and it makes the manufacturer’s paperwork a condition of the builder being able to start and a condition of the client being able to move in. A builder who orders from a manufacturer that cannot produce a compliant document set does not get a permit. That is a commercial consequence long before it is a legal one.
A surveyor may also inspect those documents during the build, and may rely on a certificate from another registered practitioner or endorsed building engineer that an affected system complies.
The penalties, and what they are worth
| Obligation | Who it falls on | Maximum penalty |
|---|---|---|
| Do not make or assemble a prescribed system for a use that will not comply | Anyone doing the work, registered or not | 500 penalty units individual, 2,500 body corporate |
| Do not carry out prescribed prefabrication work with non compliant electrical or plumbing work in it | Anyone doing the work | 500 penalty units individual, 2,500 body corporate |
| Supply a specified system with the full documentation set attached | Registered prefabrication builder only | 120 penalty units individual, 600 body corporate |
| Do not issue a building permit without evidence the documents will reach the builder | Relevant building surveyor | Permit cannot be issued |
| Do not issue an occupancy permit without having seen the documents | Relevant building surveyor | Permit cannot be issued |
At the penalty unit value fixed for the current financial year, 500 penalty units is a little over $104,000 for an individual and 2,500 units is a little over $522,000 for a body corporate. The documentation offence works out at roughly $25,000 and $125,000. Penalty unit values are reset each July, so those figures will be higher by the time any of this commences.
There is a second layer. All three section 15D offences are also civil penalty provisions under the new enforcement Act, which means the regulator can pursue them without a criminal prosecution.
Worth being precise about who is exposed. The manufacturing offences apply to any person doing the work, registered or not. Only the documentation duty is limited to registered prefabrication builders. Being unregistered is not a shield from the offences. It only removes the ability to supply lawfully.
When this starts
Not soon, and later than the rest of the bill.
The prefabrication Division commences on a day to be proclaimed. If it has not been proclaimed by 1 December 2027, it commences automatically on that day. Most of the omnibus bill carries a forced date of 1 June 2027. The prefabrication provisions were deliberately moved to the later group.
The reason is structural rather than political. The prefabrication offences are written as civil penalty provisions under Part 6.7 of the Building and Plumbing Administration and Enforcement Act 2026 and cross reference its enforcement sections. That Act is expected to commence mid to late 2027 and no later than 1 December 2027. The prefabrication scheme cannot switch on before the machinery that enforces it, so the two dates were aligned.
The practical read is that manufacturers have somewhere between twelve and fifteen months, and possibly a little more, before any of this bites. That is a genuine runway, and it is longer than the regulations will take to appear.
Mandatory in Victoria, voluntary nationally
The timing here is awkward in a way the industry should notice.
The Australian Building Codes Board is running consultation on a national scheme for manufacturers of prefabricated construction, with draft scheme rules, a proposed National Construction Code definition and an economic analysis on the table. Feedback on the national voluntary certification scheme now out in draft closes on 15 September 2026. The word in the title is voluntary.
Victoria has legislated a mandatory scheme, with criminal and civil penalties, while the national voluntary scheme is still in consultation. Nothing in the Victorian amendments refers to the national scheme, recognises certification under it, or provides a pathway between the two.
That may be resolved in the Victorian regulations, which are yet to be drafted. It may not be. Either way, a manufacturer selling into multiple states now has to plan for the possibility of certifying twice, under two schemes with different legal characters, one of which can fine them and one of which cannot.
NSW arrived at a similar idea by a different road
Victoria is not moving alone. NSW passed its own new Building Act in August, and its definition of a prefabricated building turns on the same test: a modular component that becomes a building element once installed and cannot be inspected without destructive testing or destructive opening.
Two states have independently landed on inspectability as the thing that makes prefab a regulatory problem. That is a strong signal about where the National Construction Code definition is likely to end up, and it is a reasonable basis for manufacturers to design their documentation around that concept now rather than waiting.
The mechanisms differ. NSW is working through its approvals system. Victoria is working through registration and the permit. Manufacturers will have to satisfy both.
Why this is a national story
Every state is now betting on offsite construction to fix housing supply. Factories are being funded, tenders are being run, and finance products are being written for modular homes. What has been missing is the regulatory layer that tells a surveyor what to accept and a manufacturer what to prove.
Victoria has just written that layer, and it puts the burden where the knowledge is. The manufacturer certifies. The builder receives. The surveyor checks. That is a coherent answer to a real problem, and it is a meaningful shift in how construction methods are actually changing on Australian sites.
The risk sits in the prescribing. Almost everything operative in Part 2A depends on what the regulations prescribe: which systems are prescribed systems, which methods are prescribed methods, which systems are affected systems for permit purposes, and what a prefabrication builder has to hold to be registered. Drawn narrowly, this is a targeted scheme for closed panels and volumetric modules. Drawn broadly, it captures a large share of what is currently sold as a wall frame or a truss.
The Good Builder Take
Do not read this as red tape landing on modular. Read it as prefab finally being given a regulatory home.
The absence of one has been a real commercial problem. A surveyor who cannot see inside a closed panel and has no statutory basis to demand evidence has two options: refuse it or wave it through. Both have been happening, inconsistently, for years. That inconsistency is a bigger tax on the sector than a documentation requirement.
The question to hold is scope, not principle. What gets prescribed decides whether this is a scheme for volumetric manufacturers or a scheme for everyone who sends a fabricated element to site. Nobody knows yet, and that is the thing to watch when the regulations appear.
What is still unwritten
- Which prefabricated building systems are prescribed, and which methods of manufacture are prescribed methods. Nothing in the Act operates until this is settled.
- Which systems are affected systems for the purposes of the permit provisions. This determines how many jobs the surveyor checkpoint actually touches.
- What a prefabrication builder needs to hold. The Act creates the category and gives a regulation making power to specify what each class of prefabrication builder is authorised to do. As at today nobody can apply, because the requirements do not exist.
- Whether national voluntary certification will count for anything in Victoria.
None of this is unusual for a scheme at this stage, but it does mean the useful step for manufacturers is preparation rather than compliance. The document set in section 15E is knowable now: intended use, limits on use, a compliance certification, electrical and plumbing certificates, transport and handling instructions, and use instructions. A manufacturer that can produce that set today will find registration straightforward whenever it opens, and will be better placed against registration and compliance obligations across the states as other jurisdictions follow.
For builders installing offsite product rather than making it, the exposure is narrower but not zero. The manufacturing offences reach anyone who assembles two or more systems away from the site where they will be used. A builder running a yard operation should look closely at whether that describes what they do.
Where this leaves the sector
Victoria has moved prefabrication from something the building system tolerates to something it regulates. That is a change of status, and on balance it is the change the sector has been asking for.
The timeline gives everyone room. Assent, then regulations, then proclamation, with a backstop of 1 December 2027. Nothing needs to happen next week.
What does need to happen is that manufacturers stop treating certification as a document produced when a surveyor asks and start treating it as part of the product. That is where this is heading in every jurisdiction, whatever the local mechanism turns out to be.
Frequently asked questions
It is a new category of registered building practitioner created by amendments to the Building Act 1993 that have passed both Houses of the Victorian Parliament. It is separate from builder registration, and the existing definition of building practitioner has been amended to carve prefabrication builders out of the general builder category. The qualifications, experience and scope of work for each class of prefabrication builder are left to regulations that have not yet been made, so registration is not open and no timeframe has been published.
That depends entirely on what the regulations prescribe, and they do not exist yet. The statutory definition of a building component turns on whether the thing can be inspected once installed without being opened and damaged or destructively tested. A closed panel with lining already fitted meets that description. An open frame generally does not. But the offences attach to prescribed systems and prescribed methods, so the practical scope will be set by the regulations rather than the definition alone.
The prefabrication Division commences on a day to be proclaimed, and automatically on 1 December 2027 if it has not been proclaimed before then. That is later than most of the bill it travelled in, which carries a forced date of 1 June 2027. The later date aligns the scheme with the Building and Plumbing Administration and Enforcement Act 2026, which supplies the enforcement machinery the prefabrication offences rely on.
Six things, where the system is a specified system supplied by a registered prefabrication builder: written information on the use the system is intended for, any limits or conditions on that use, written certification from the prefabrication builder that the system complies with the building regulations when used as instructed, an electrical compliance certificate where the Electricity Safety Act requires one, a plumbing compliance certificate where one is required, and written instructions for safe transport and handling and for use of the system.
No. The national scheme being developed by the Australian Building Codes Board is voluntary and has not been finalised, with consultation on the draft rules closing on 15 September 2026. The Victorian provisions are mandatory and carry criminal and civil penalties. Nothing in the Victorian amendments recognises national certification or creates a pathway between the two schemes. Whether the Victorian regulations do so is an open question.
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Last updated: 1 September 2026.
This article contains general information only. It reflects the position at the date of publication and does not take account of any particular business, product or circumstance. Legislation and regulations referred to here may change before they commence. Readers should obtain their own professional guidance before acting on anything set out above.
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