The Inspection Has Moved From the Council to the Tradesperson
The plumbing and drainlaying self-certification scheme commenced on 7 September 2026. It lets an endorsed certifying plumber or drainlayer certify eligible consented work themselves, rather than booking a building consent authority (BCA) inspection. The scheme is voluntary, and owners can still choose the standard inspection route.
For a busy plumbing business the appeal is obvious: fewer days lost waiting for an inspector, and fewer jobs held up at the point where the trench is open or the wall is still unlined. The trade-off is less obvious and matters more for insurance. When the council does not inspect, the council does not carry the risk of having passed defective work. Someone else does.
What the Law Actually Changed
The scheme rests on the Building and Construction Sector (Self-certification by Plumbers and Drainlayers) Amendment Act 2026, which amends both the Building Act 2004 and the Plumbers, Gasfitters, and Drainlayers Act 2006. Four provisions shape the liability picture.
- A BCA must accept a certificate of compliance from an endorsed plumber or drainlayer as evidence that the work complies with the building consent (new section 94(2)(aa) of the Building Act).
- A BCA is not liable for a certificate of compliance issued by an endorsed person (new section 392(1)(cb) of the Building Act).
- The minimum standards for endorsement must include standards relating to technical competency, experience, ability to meet potential civil liability, and business and administrative practices (amended section 30 of the Plumbers, Gasfitters, and Drainlayers Act).
- The Plumbers, Gasfitters, and Drainlayers Board may audit endorsed people and their certificates, and endorsements expire within three years unless renewed.
Building Performance's guidance for practitioners puts it plainly: by self-certifying, you take on the responsibility for the work's compliance with the building consent, and you are liable for the work you sign off instead of the BCA.
Why the Council's Exit Matters
When a defect surfaces years after a job, the owner's lawyers look for parties who can pay. Under the inspection model the council was usually one of them, because it had inspected and passed the work. Section 392(1)(cb) removes the council from that list for self-certified plumbing and drainlaying. The certifying plumber or drainlayer, and the business that employs them, become the obvious defendants. The Act itself sets no compulsory insurance level, but it does make the ability to meet potential civil liability part of the endorsement standards, which tells you how Parliament expects the risk to be carried.
What Can and Cannot Be Self-Certified
Only plumbing and drainlaying that needs a building consent can be self-certified, and only within limits. The table below summarises Building Performance's eligibility guidance.
| Condition | Eligible | Not eligible |
|---|---|---|
| Consent | Work that needs a building consent | Exempt work, which cannot be self-certified at all |
| Building height | Buildings of no more than three storeys | Buildings over three storeys |
| Building type | Houses and other non-apartment buildings | Apartment buildings |
| Design basis | Acceptable Solution or Verification Method | Alternative solutions, except for on-site systems with no Acceptable Solution or Verification Method |
| Walls, fire separations and public services | Work clear of shared walls and fire separations | Work in a shared wall, work that penetrates a fire separation, and civil work servicing public infrastructure |
Two further conditions catch people out. The certificate of compliance must be issued within 10 working days of completing the work, and self-certification is not suitable for work the endorsed person did not supervise on site. If an amendment or minor variation takes the job outside the scheme, the standard BCA inspection applies again.
Where Public Liability Fits, and Where It Does Not
Public liability insurance responds to accidental damage to third-party property, and to some non-injury losses, arising from your business activities. For plumbers and drainlayers that typically means water damage when a fitting fails, flooding into a neighbour's property, or damage to a client's floors, fittings and contents during the job. Self-certification does not change that cover, but it changes the shape of the claims that arrive.
| Scenario | Likely claimant | Questions to put to your adviser |
|---|---|---|
| A joint you certified fails and floods the ground floor | Owner and their property insurer | Does the policy respond to resulting damage when the work itself was yours? |
| A drain you certified is later found not to comply with the consent | Owner, sometimes a later purchaser | Is the cost of fixing your own work excluded, and is there any cover for the certification itself? |
| Defect discovered years after completion | Owner or subsequent owner | Is the policy written on an occurrence or claims-made basis, and what happens if you stop trading? |
| Board audit or disciplinary inquiry | The regulator, not a claimant | Do you hold statutory liability or similar cover for legal costs? |
The second row is the one to settle first. Check whether your wording treats the cost of putting your own work right differently from damage your work causes to other property, and whether certifying compliance, which is closer to a professional statement than a physical act, falls within the activities insured. Read your own wording rather than assuming, and if certification is now part of what you do, tell your insurer or adviser so the activity is declared.
A Practical Checklist Before You Self-Certify
- Confirm your endorsement on the Board's public register, and that the work is inside the eligibility limits above
- Tell your insurer or adviser that self-certification is now part of your business, and ask how the policy treats it
- Check your limit against the value of the properties you work on, not just the value of the job
- Keep the records the scheme requires: photos, test results, decisions and the reasons for them, filed against each certificate
- Supervise every job you certify on site; the scheme does not allow certifying work you did not supervise
- Diary the 10 working day deadline for every certificate, because a late certificate can hold up the owner's code compliance certificate
- If you employ other certifiers, make sure each holds their own endorsement and understands they are personally accountable to the Board
Owners Still Have Somewhere to Go
Building Performance's guidance for homeowners directs concerns about an endorsed practitioner to the Board, while noting the Board cannot order repairs or provide compensation. That leaves civil claims as the route to recover money, which is exactly where your liability cover is tested.
Next Steps
If you are endorsed or planning to apply, review your cover now rather than at renewal, and make sure the activities on your schedule describe what you actually do. Our coverage guide explains what public liability does and does not pick up. To have a referred adviser look at your limit and wording with self-certification in mind, Get a Quote or email hello@cover4you.co.nz.