A job involving only plumbing, gas-fitting and draining does not require a major domestic building contract, even though covered domestic building work worth more than $10,000 generally requires one in writing (Consumer Affairs Victoria’s major-contract guidance, updated 24 September 2025). That exemption is separate from domestic building insurance (DBI): registered builders and tradespeople must take out DBI for clients when work is worth more than $16,000, and the client must receive the policy and a certificate of insurance covering the property before any deposit or other money is paid (Consumer Affairs Victoria’s DBI checklist, updated 8 April 2026).
Figures checked 1 October 2026.
Does a plumbing-only job need a major domestic building contract?
No. Consumer Affairs Victoria separates covered domestic building work from jobs involving only specified trades. The exemption does not disappear merely because the plumbing job or broader project has a large price.
| Check | Victorian position |
|---|---|
| Major-contract threshold | Covered domestic building work worth more than $10,000 requires a written major domestic building contract. |
| Plumbing, gas-fitting and draining | A job involving only this listed work does not require a major domestic building contract. |
| Overall project value | A high total price does not, by itself, turn plumbing-only work into major domestic building work. |
| Mixed projects | If the arrangement also includes covered work, identify each workstream and assess the actual scope rather than relying on the total price alone. |
Construction, renovations, alterations, extensions, repairs, demolition or removal, and associated site work can fall within the covered category when carried out in association or conjunction with constructing or renovating a home. A mixed project should therefore not be treated as exempt solely because it includes plumbing.
A major domestic building contract is not required for the plumbing-only job, but Consumer Affairs Victoria still recommends a written contract for all building work, including work worth $10,000 or less. That helps define the work and resolve disputes.
Does the major-contract exemption also remove the DBI requirement?
No. The two rules answer different questions.
| Rule | What it covers |
|---|---|
| Major domestic building contract | Whether the nature and scope of the work place it within the major-contract category. |
| Domestic building insurance | Whether a registered builder or tradesperson must take out DBI for work worth more than $16,000. |
| Evidence before payment | Whether the client has received the DBI policy and a certificate of insurance covering the property before paying. |
For the hypothetical plumbing-only job, the plumbing exemption answers the contract-category question but does not answer the separate DBI question. DBI is additional to the builder’s contractual obligations and warranties; it does not replace them.
Do warranty and consumer rights still apply without a major contract?
Yes. A building contract should identify the client’s warranty rights whether or not it is a major domestic building contract. Consumer Affairs Victoria says implied warranties automatically apply to all domestic building work, regardless of its cost or whether a written contract exists.
Consumer guarantees under the Australian Consumer Law also apply. These rights cannot be signed away.
Builders and tradespeople must:
- carry out building work in a proper and workmanlike manner and according to the contract’s plans and specifications;
- use reasonable care and skill;
- comply with legal requirements;
- complete the work by the date or within the period specified in the contract; and
- supply materials that are good and suitable for their purpose and new, unless the contract states otherwise.
Other work and materials must be reasonably fit for their intended purpose.
What must the client receive before paying a deposit or other money?
For DBI work, the builder or tradesperson must provide both documents before the client pays a deposit or any other money:
- a copy of the DBI policy; and
- a certificate of insurance covering the property.
Consumer Affairs Victoria also recommends separate checks:
- Ask the builder for a copy of their current certificate of public liability insurance.
- Before work starts, check with the home and contents insurer whether the renovations are covered; extra cover may be needed.
A public liability insurance certificate is a separate document and should not be treated as a substitute for the DBI policy and certificate covering the property.
What does DBI actually cover?
DBI, formerly called builders warranty insurance, provides limited cover. It responds when a builder or tradesperson cannot finish the project or fix defects because they have died, become insolvent or disappeared.
Consumer Affairs Victoria summarises the main policy features as follows:
| Feature | Consumer Affairs Victoria summary |
|---|---|
| Defect cover | Costs up to $300,000 to fix structural defects for 6 years and non-structural defects for 2 years. |
| Uncompleted work | A claim may be limited to only 20% of the contract price. |
| VCAT or court orders | A policy issued on or after 1 July 2015 also covers the builder’s failure to comply with a final order made by VCAT or a court. |
In other cases, the builder or tradesperson is required to fix or complete the works in accordance with the contract. This is general information, not financial or legal advice. Check the current regulator page and the policy’s PDS before relying on a threshold, coverage statement or payment requirement.
Sources
- What work requires a building contract? — Consumer Affairs Victoria
- Implied warranties and domestic building insurance checklist — Consumer Affairs Victoria
FAQ
Does a plumbing-only job need a major domestic building contract in Victoria?
No. A job involving only plumbing, gas-fitting and draining is excluded from the major domestic building contract category, even when its price is high. A mixed project may need separate assessment because it could also include covered renovation, alteration, extension or repair work.
Does the plumbing exemption mean no DBI is required?
No. DBI is a separate requirement. Registered builders and tradespeople must take out DBI for clients when the work is worth more than $16,000.
What must be provided before a deposit or other payment?
The client must receive a copy of the DBI policy and a certificate of insurance covering the property before paying a deposit or any other money.
Is a public liability certificate enough to show DBI?
No. Consumer Affairs Victoria separately recommends checking the builder’s current public liability insurance certificate. It does not replace the DBI policy and certificate of insurance covering the property required before payment.
Should a plumbing-only job still have a written contract?
A major domestic building contract is not required, but Consumer Affairs Victoria recommends a written contract for all building work, including lower-value work, to clarify the scope and help resolve disputes.
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