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Electrical work in factory-built homes
| Prefab-specific guidance | Tasmania — two options for connecting a prefabricated structure[1] |
|---|---|
| Does a pod's WaterMark cover wiring? | No — plumbing only[2] |
| NSW certificate | CCEW, within 7 days of testing[3] |
| VIC certificate | Certificate of Electrical Safety[4] |
| QLD certificate | Certificate of testing and compliance on connection[5] |
| WA certificates | Notice of completion and electrical safety certificate[6] |
| SA certificate | Certificate of compliance before energisation[7] |
| ACT, NT | Not covered by sources compiled here |
| *Each rule applies only in the jurisdiction stated in the source. | |
Wiring installed in a module in a factory is checked and certified under the electrical safety rules of the state where the home is connected. Tasmania is the only regulator in the sources compiled here with guidance written for prefabricated structures: if the module arrives without a certificate from a Tasmanian licensed electrician, the electrician who connects it on site tests and certifies the whole installation.[1] A WaterMark on a bathroom pod covers its plumbing, not its wiring.[2]
In a modular home the cables, switchboard and power points are usually installed and lined over before the module leaves the factory. On site, an electrician connects the module to the supply and to the other modules, and then has to certify an installation much of which they did not see go in. This page sets out how the published rules handle that, and what certificate to expect in each state. The plumbing equivalent is covered in plumbing in factory-built homes.
Why factory wiring is a separate question §
For plumbing, a module can be certified nationally as a WaterMark product. That certification does not reach the electrical work: a WaterMark licence for a bathroom pod covers the Plumbing Code only, and the pod's electrical work, structure, waterproofing and fire protection need their own evidence of compliance.[2] The sources compiled here include no national scheme for certifying a module's wiring as a product in the same way.
The risk is not theoretical. Building Commission NSW reported in 2024 that audits of NSW apartment buildings with bathroom pods had found unsafe electrical wiring, alongside non-compliant plumbing fixtures and waterproofing.[8] Those were apartment buildings, not houses, but the finding is the reason the question is worth asking.
Tasmania: two options at connection §
Tasmania's electrical regulator treats assembling, repairing, altering or adding to the wiring of a prefabricated structure as electrical work that only a licensed electrical practitioner may do.[1] It separates structures that plug in, such as caravans and food vans, from structures that are hard-wired, such as granny flats, pod homes and site sheds. A hard-wired connection must be made by a licensed practitioner.[1]
When the electrician arrives to connect a hard-wired structure, one of two situations applies:[1]
- Option 1 — the structure comes with a Tasmanian certificate
- A Tasmanian licensed electrician has already signed a Certificate of Electrical Compliance for the wiring inside the structure. The connecting electrician checks that the certificate matches the structure's serial number, inspects for damage in transport and checks the switchboard, carries out the required tests, and lodges both certificates. Defects in the original work remain the original electrician's responsibility.
- Option 2 — no certificate is provided
- The regulator notes this is often the case for structures assembled outside Tasmania. The connecting electrician carries out every test in Chapter 8 of AS/NZS 3000 on the whole installation and certifies all of it, and may be held accountable for defects anywhere in it.
Either way, the certificate is lodged with TechSafe Australia within three days of the installation being energised, and the work must meet AS/NZS 3000, the Wiring Rules, with AS/NZS 3001 also applying to transportable structures.[1] A transportable structure carries an Electrical Compliance Label near its switchboard.[1] The guidance is written for electricians, but the practical point for a buyer is the same: ask whether the module will arrive with a certificate, and from whom. Tasmanian approvals more broadly are covered in modular home rules in Tasmania.
The certificate in each state §
For the other states, the sources compiled here describe the general electrical certificate rather than any rule specific to factory-built homes. Each certificate is issued by the licensed electrical contractor and records that the work has been tested.
| State | Certificate | When and to whom | Source |
|---|---|---|---|
| NSW | Certificate of Compliance for Electrical Work (CCEW) | Lodged with Building Commission NSW within 7 days of testing; copy to the network operator where required and to the customer | Building Commission NSW[3] |
| VIC | Certificate of Electrical Safety | Prescribed work, such as consumer mains, inspected by a licensed electrical inspector before connection; copies within 16 days. Other work: copies within one month | Energy Safe Victoria[4] |
| QLD | Certificate of testing and compliance | Each time an installation that was worked on is connected to a source of electricity; to the person who engaged the contractor | WorkSafe Queensland[5] |
| WA | Notice of completion; electrical safety certificate | Notice to the network operator within 3 days, needed before supply is connected; certificate to the customer within 28 days | Building and Energy WA[6] |
| SA | Certificate of compliance | Certified before energisation; given to the owner within 30 days | Office of the Technical Regulator[7] |
| TAS | Certificate of Electrical Compliance | Lodged with TechSafe Australia within 3 days of energising | CBOS Tasmania[1] |
| ACT, NT | Not covered by sources compiled here | — | |
Two details matter for a modular buyer. In Queensland, the certificate goes to the person who engaged the electrical contractor, which is the builder where the builder engaged them, rather than the owner.[5] Asking the builder for a copy at handover is the way to get it. In Western Australia, the network operator must have the notice of completion before it connects supply.[6]
How these states treat wiring installed in a factory in another state or overseas — whether the connecting electrician certifies the whole installation, as in Tasmania's second option — is not covered by the sources compiled here.
Summary §
| Question | What the sources state | Source |
|---|---|---|
| Who may do the work | A licensed electrical worker, including work on a prefabricated structure | CBOS Tasmania[1]; Building Commission NSW[3] |
| Does a pod's WaterMark cover wiring? | No; plumbing only | ABCB handbook[2] |
| Module arrives without a certificate (TAS) | Connecting electrician tests and certifies the whole installation | CBOS Tasmania[1] |
| Wiring standard | AS/NZS 3000; AS/NZS 3001 for transportable structures | CBOS Tasmania[1] |
| Factory wiring rules in other states | Not covered by sources compiled here | — |
Common questions §
Who certifies wiring done in a factory?
In Tasmania, either a Tasmanian licensed electrician certifies it in the factory and the connecting electrician checks and adds their own certificate, or, if none is provided, the connecting electrician certifies the whole installation.[1] Rules for other states are not covered by the sources compiled here.
Does a WaterMark bathroom pod have certified wiring?
No. A WaterMark licence for a pod covers its plumbing only; electrical work needs its own evidence of compliance.[2]
What electrical certificate should I receive in NSW?
A Certificate of Compliance for Electrical Work, lodged with Building Commission NSW within seven days of the electrical test; a copy can be sent to the customer or obtained from the portal.[3]
Why didn't I receive the electrical certificate in Queensland?
In Queensland the certificate goes to the person who engaged the electrical contractor, which is the builder where the builder engaged them.[5] Ask the builder for a copy.
Does a transportable home need a compliance label?
In Tasmania, transportable structures carry an Electrical Compliance Label near the switchboard.[1] Requirements in other states are not covered here.
What is not covered here §
How New South Wales, Victoria, Queensland, Western Australia and South Australia treat wiring installed in a factory interstate or overseas is not covered by the sources compiled here, and electrical certificate rules in the ACT and the Northern Territory are not covered.
Approval and safety marking of electrical equipment and appliances, such as imported switchboards, light fittings and cooktops, is not covered. Gas fitting, solar and battery systems, and metering requirements are not covered; for batteries see home battery rebates for secondary dwellings.
No source compiled here reports how often factory wiring is found defective compared with wiring installed on site.
Questions worth asking §
- Where will the module be wired — in this state, another state or overseas?
- Will a licensed electrician sign a certificate for the factory wiring, and is that licence valid in the state where the home will stand?
- Who will connect the module on site, and will their certificate cover the whole installation or only the connection?
- Who will receive the electrical certificates, and will copies be handed to me at handover?
- Was the wiring inside a bathroom pod or kitchen module certified separately from its plumbing?
Related: service connections · handover inspections on a modular home · importing a prefab home
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References §
- Consumer, Building and Occupational Services, Tasmania — Electrical Standards and Safety Regulatory Guide, Prefabricated structures, version 2.0, September 2022. States that assembling, repairing, altering or adding to the electrical installation of a prefabricated structure is electrical work for a licensed electrical practitioner; that plug-and-socket structures such as caravans and food vans differ from hard-wired structures such as granny flats, pod homes and site sheds, whose connection must be made by a licensed practitioner; that low-voltage work must comply with AS/NZS 3000, with AS/NZS 3001 for transportable structures; that where the structure arrives with a Certificate of Electrical Compliance signed by a Tasmanian licensed electrician, the connecting electrician checks it matches the structure, inspects for transport damage and the switchboard, tests, and lodges both certificates; that where none is provided, which is often the case for structures assembled outside Tasmania, the connecting electrician tests the whole installation to Chapter 8 of AS/NZS 3000 and certifies all of it; that certificates are lodged with TechSafe Australia within three days of energising; that without an original certificate the connecting contractor may be held accountable for defects; and that transportable structures need an Electrical Compliance Label near the switchboard. cbos.tas.gov.au/__data/assets/pdf_file/0020/614090/CBOS-ESS-Regulatory-Guide-Prefabricated-structures.pdf
- Australian Building Codes Board — Prefabricated, modular and offsite construction handbook, NCC 2022, version 1.1, December 2024. States that a WaterMark licence for a bathroom pod covers only Plumbing Code requirements, not structure, electrical, waterproofing or fire protection, and that pods involve several components and trades, each of which must comply with the NCC. abcb.gov.au/resource/handbook/prefabricated-modular-and-offsite-construction-handbook
- Building Commission NSW — Electrical compliance requirements, last updated 19 October 2026. States that electrical wiring work must be done by or under the supervision of a licensed electrician; that the tester submits a Certificate of Compliance for Electrical Work (CCEW) to Building Commission NSW as soon as practical and no later than seven days after the test; that the network operator receives a copy where required, such as for new installations; that customers can receive a copy by email or from the portal; and that from 1 July 2026 CCEWs must be lodged through the eCert portal. nsw.gov.au/housing-and-construction/compliance-and-regulation/electricians/electrical-compliance-requirements
- Energy Safe Victoria — Prescribed and non-prescribed work. States that electrical installation work requires a Certificate of Electrical Safety; that prescribed work, such as consumer mains, must be inspected by a licensed electrical inspector before connection to supply, with copies given within 16 days to the customer, the distribution business and Energy Safe; and that a certificate for non-prescribed work is given to the customer and Energy Safe within one month of completion. energysafe.vic.gov.au/certificates-electrical-safety/obligations-and-guidelines/prescribed-and-non-prescribed-work
- WorkSafe Queensland, Electrical Safety Office — Issuing certificates of compliance. States that electrical contractors must give a certificate of testing and compliance every time an installation on which electrical work was performed is connected to a source of electricity, certifying that it has been tested and is electrically safe and in accordance with the wiring rules; that the certificate goes to the person for whom the work was done, which is the builder where the builder engaged the contractor; that it is given as soon as possible after the work; and that the contractor keeps a copy for five years. worksafe.qld.gov.au/laws-and-compliance/electrical-safety-laws/issuing-certificates-of-compliance
- Government of Western Australia — Building and Energy — Electrical technical guidance for licence holders. States that the electrical contractor lodges a notice of completion for notifiable installing work with the network operator, or Building and Energy if there is no network connection, within three days of completion, certifying the work is tested, compliant and safe to connect, and that the network operator must have it before connecting supply; and that an electrical safety certificate is given to the person for whom the work was done within 28 days. wa.gov.au/government/multi-step-guides/information-electrical-licence-holders/electrical-technical-guidance
- Office of the Technical Regulator, South Australia — Electronic certificates of compliance (eCoC). States that a registered electrical contractor or worker must certify the certificate of compliance before the installation is made available for energisation, and give it to the owner or operator of the installation within 30 days. energymining.sa.gov.au/industry/regulatory-services/office-of-the-technical-regulator/electronic-certificates-of-compliance-ecoc
- Building Commission NSW, Department of Customer Service — Position Paper on Regulation of Prefabricated Buildings, Draft Building Bill 2024, August 2024 (copy hosted by the Australian Institute of Architects). Reports that audits of NSW apartment buildings with bathroom pods found non-compliant plumbing fixtures, non-compliant waterproofing and unsafe electrical wiring; proposes that the builder and electrician involved in prefabricated building work be licensed; and states that the paper does not reflect final government decisions. architecture.com.au/wp-content/uploads/Building-Commission-NSW-Position-Paper-%E2%80%93-Regulation-of-Prefabricated-Buildings.pdf
Figures are as published by the sources above at their respective dates and are paraphrased summaries, not verbatim reproductions. Verify current pricing and rules directly with builders, lenders and planning authorities.