A plumbing compliance certificate, formally called a Certificate of Compliance (CoC), is a licensed plumber’s written declaration that completed work meets the Plumbing Code of Australia and relevant state standards. Property owners need one for insurance claims, council records, and conveyancing when selling. It confirms the work was compliant at the time of completion, but it is not a workmanship guarantee against future faults.
TL;DR:
- Only licensed plumbers can issue a Compliance Certificate, and they must supervise or complete the work personally to avoid legal and insurance issues.
- A CoC is required for significant work like new sewer connections, underground drainage, or gas installations, but not for minor repairs like fixing a tap washer.
- Proper lodgement of the CoC through the relevant state system is crucial, and owners should request proof of lodgement and keep all related documents for future reference.
- A CoC confirms compliance at completion but does not guarantee future plumbing performance; owners should also obtain a workmanship guarantee separately.
- Failing to secure or properly lodge a CoC can delay sales, trigger disputes, and expose property owners and plumbers to legal or regulatory penalties.
Table of Contents
- What is a Certificate of Compliance and what standards does it reference?
- When do you actually need a plumbing compliance certificate?
- Who is allowed to issue a CoC, and what happens if they get it wrong?
- What details must a CoC include, and what should you keep on file?
- How do you get and lodge a plumbing compliance certificate?
- Does a compliance certificate cover future plumbing problems?
- What if there’s no certificate, or you dispute it?
- A Sydney plumber’s take on compliance paperwork
- Get your compliance certificate and workmanship guarantee sorted properly
- Sources
- FAQ
What is a Certificate of Compliance and what standards does it reference?
A Certificate of Compliance confirms plumbing or drainage work complies with the governing Act, Regulation, the Plumbing Code of Australia, and AS/NZS 3500. It names the licensed plumber as the person responsible for that work, which matters if a dispute or defect emerges later.
The legal foundation differs by state but follows a similar shape. In New South Wales, the Plumbing and Drainage Act 2011 requires the responsible person to issue a CoC to both the regulator and the person who commissioned the work, within set periods. Victoria’s framework sits under the Building Act and is administered through the Victorian Building Authority.
None of this makes a CoC a commercial warranty. It is a regulatory record, not a promise that a tap will never drip again. That distinction runs through this entire article, and it is worth holding onto from the start.
When do you actually need a plumbing compliance certificate?
Requirements shift from state to state, and the trigger is usually the type of work rather than its dollar value. A $400 tap washer swap rarely needs one; a new sewer connection almost always does.
- New South Wales: A Notice of Work plus CoC is typically required for below-ground drainage, new sewer connections, and similar notifiable work. Plumbers lodge the certificate through the MyInspections gateway in metropolitan Sydney and Newcastle, or with the local regulator elsewhere.
- Victoria: A licensed plumber must issue the certificate and lodge it with the VBA within five days of finishing the job. Certificates purchased rather than issued directly on completion now carry a 12-month expiry, a change the VBA introduced in 2025.
- Western Australia: Lodgement runs through eNotice, the state’s online system for Notices of Intention and Certificates of Compliance. Plumbers must retain a copy for six years.
- South Australia: Electronic CoC lodgement obligations apply, with the local regulator managing the record.
Common triggers across every state include new below-ground drain work, major drainage alterations, certain gas installations, cooling tower connections, and reconnecting a property to mains services. If your job falls into one of those categories, assume a certificate is required and ask your plumber to confirm before work starts.
Who is allowed to issue a CoC, and what happens if they get it wrong?
Only a licensed plumber can issue a Certificate of Compliance. Registered plumbers (a lower qualification tier in most states) can carry out limited work but generally need supervision from a licensee for anything requiring certification.
Supervision is not a rubber stamp. A licensed plumber supervising registered tradespeople must inspect work as it progresses, specify the correct method, and be satisfied the job is finished to standard before signing off. VBA guidance is blunt on this point: a plumber must not issue a certificate for work they did not complete or personally supervise.
Getting this wrong carries real consequences. Incorrect certification can trigger disciplinary action from the state regulator, void insurance coverage tied to that work, and expose the plumber to legal liability if a defect later causes damage.
What details must a CoC include, and what should you keep on file?
A valid certificate is not a vague sign-off. Expect it to include:
- The licensee’s name and licence number
- A full description of the work carried out
- Test results, where applicable (pressure tests, for instance)
- Completion date and, for NSW, any relevant consent numbers
- Confirmation the as-laid plan matches what was actually installed
Where drainage work is involved, a sewer service diagram (SSD) often accompanies the certificate, and some jurisdictions issue a Combined Notice of Work and Certificate of Compliance form that bundles both documents with copies for the licensee, owner, and regulator.
Keep every copy. Conveyancers ask for them during a sale, and insurers ask for them after a claim, so a missing SSD can hold up settlement at the worst possible moment.
How do you get and lodge a plumbing compliance certificate?
Getting a CoC properly issued is mostly about asking the right questions before the invoice is paid, not chasing paperwork afterwards.
- Request the signed CoC directly from the plumber once the job is finished.
- Ask for proof of lodgement, along with copies of any SSD or as-laid plan.
- Confirm the lodgement timeframe. VBA rules require certificates within five days of completion, and other states run on similar clocks.
- Store the documents somewhere you can retrieve them years later, not just in an email you might delete.
On the plumber’s side, the certificate is typically lodged through eNotice in WA, MyInspections in metropolitan NSW, or VBA360 in Victoria, with the plumber retaining their own copy for the statutory period.
Emergency and partial works still need certification, just on a different clock. A burst pipe fixed at midnight gets the same paperwork as a scheduled bathroom renovation, though the plumber may lodge it once normal business systems reopen rather than on the spot.
Pro Tip: Ask for the lodgement reference number, not just the certificate itself. A signed CoC that was never actually lodged with the regulator is close to worthless if a dispute arises later.
Does a compliance certificate cover future plumbing problems?
No. A CoC confirms the work was compliant with the Plumbing Code of Australia at the moment it was signed off. It says nothing about what happens if a fitting fails eighteen months later.
This is where the phrase workmanship guarantee matters, and where owners most often get confused. A workmanship guarantee meaning, in practical terms, is a private contractual promise from the plumber or business that if their work fails within a defined period, they will fix it at no extra cost. It sits alongside the CoC, not inside it. Compliance certificates document responsibility at completion; they don’t create an ongoing warranty.
When you hire a plumber, ask for both: the CoC for regulatory proof, and written terms on the workmanship guarantee, including its duration. Conveyancers and insurers will want the certificate; you’ll want the guarantee if something fails down the track.
What if there’s no certificate, or you dispute it?
Start by asking the plumber directly for the signed CoC and lodgement evidence, plus any SSD or as-laid plan they hold. If that goes nowhere, contact the relevant state regulator, such as Building Commission NSW or the VBA, and request an inspection or formal guidance.
Tell your conveyancer immediately if a sale is underway, and keep a written record of every call and email. For higher-stakes disputes, an independent compliance inspection can settle the question before it becomes a legal one.
A Sydney plumber’s take on compliance paperwork
Owners rarely ask about compliance certificates until settlement day, when a solicitor suddenly needs one that was never filed properly. Ask for it the moment the job finishes, not months later.
Priority Plus Plumbing lodges every eligible certificate through the correct state system and hands owners copies of the CoC, SSD, and as-laid plans where relevant. Every job also carries a workmanship guarantee, because a compliant certificate and a durable repair are two different promises, and owners deserve both.
— Peter Honey
Get your compliance certificate and workmanship guarantee sorted properly
Chasing down a missing CoC after a plumber has moved on to the next job is a frustrating way to spend a Tuesday. Priority Plus Plumbing issues and lodges Certificates of Compliance as standard practice on every eligible job across Sutherland Shire and Sydney, whether that’s through MyInspections, eNotice, or VBA360, and hands you the paperwork, including sewer service diagrams and as-laid plans, without having to ask twice.
Every job also comes backed by a genuine workmanship guarantee, so you’re not left choosing between regulatory proof and a plumber who stands behind their own work. From CCTV drain inspections to full commercial and strata compliance work, records are kept and handed over, ready for conveyancing or an insurer if you ever need them. If you’re facing an urgent plumbing issue that also needs proper certification, call for emergency plumbing help now and get both the repair and the paperwork sorted in one visit.
Sources
- Plumbing inspection documents — NSW Government
- Plumbing compliance certificates — Building Practitioners Board / VBA (Victoria)
- Using plumbing eNotice — Western Australian Government
- Combined Notice of Work and Certificate of Compliance — Building Commission NSW
- Issuing compliance certificates — Victorian Building Authority (VBA)
FAQ
Do I need a plumbing compliance certificate?
You need one whenever notifiable work is carried out, such as new drainage connections, gas fitting, or below-ground pipework. Simple repairs like fixing a leaking tap usually don’t require a CoC.
How can I obtain a plumbing certification in Australia?
You don’t obtain the certificate yourself. Your licensed plumber issues it on completion and lodges it with the relevant state system, and you should request a signed copy plus lodgement proof directly from them.
How do I get a Certificate of Compliance issued and lodged correctly?
Ask your plumber to confirm the work requires a CoC before the job starts, then request the signed certificate, lodgement reference number, and any supporting sewer service diagram once it’s finished.
How long does a plumbing compliance certificate last in Victoria?
A certificate issued directly on completion of the work doesn’t expire. However, certificates purchased rather than issued at completion now carry a 12-month expiry, a rule the VBA introduced in 2025.
What’s the difference between a CoC and a workmanship guarantee?
A CoC confirms the work met the Plumbing Code of Australia at completion; a workmanship guarantee is a separate promise from the plumber to fix defects that appear later. Priority Plus Plumbing provides both on eligible jobs.