Yes — in most cases your licensed drainlayer can absolutely organise council inspections on your behalf, and in practice this is the norm on most residential drainage projects in New Zealand. Because drainage work is restricted trade work under the Plumbers, Gasfitters, and Drainlayers Act 2006, the licensed professional carrying out the work is responsible for ensuring it meets the required standards, which makes them the natural point of contact with your local council throughout the inspection process.
Why Inspections Are Required
Drainage work that connects to the public sewer or stormwater network — or involves new on-site wastewater systems — must comply with the NZ Building Code, particularly clauses G13 (Foul Water) and E1 (Surface Water). Most drainage work of this nature requires a building consent, and with that consent comes a mandatory inspection regime. The purpose of inspections is to confirm that buried pipework is correctly laid, graded, jointed, and bedded before it is covered over — problems that are extremely costly to fix once the ground is backfilled.
What a Licensed Drainlayer Can Do on Your Behalf
A Licensed Building Practitioner (LBP) or a drainlayer licensed by the Plumbers, Gasfitters and Drainlayers Board (PGDB) is authorised to:
- Apply for building consent on your behalf (with your written authority)
- Book inspection appointments directly with your territorial authority (your local council)
- Liaise with the council inspector on-site during the inspection
- Respond to any defects or requests for remediation identified during inspection
- Sign off producer statements or other technical documentation required by the council
This means you, as the homeowner, often don't need to be present or involved in the day-to-day back-and-forth with council — your drainlayer handles it. That said, it's worth staying in the loop so you know when inspections are scheduled and what the outcomes are.
How the Inspection Process Typically Works
While the exact process varies between councils, a typical residential drainage inspection sequence looks like this:
| Stage | What Happens |
|---|---|
| Pre-pour / pre-cover inspection | Inspector checks open trenches, pipe grades, bedding, and joints before backfilling |
| Pressure or water test | Pipework is tested for leaks (often done by the drainlayer before calling the inspector) |
| Final inspection | Council confirms all work matches the consented plans and issues a Code Compliance Certificate (CCC) |
Your drainlayer will typically call the council to book each inspection at the right stage of the job. Do not allow backfilling before the pre-cover inspection is signed off — this is a common and costly mistake.
Building Consent vs Schedule 1 Exemptions
Not all drainage work requires a building consent. MBIE Building Performance outlines Schedule 1 exemptions under the Building Act 2004, which cover certain minor or like-for-like repairs. For example, replacing a short section of existing drain with the same material and grade may be exempt. However, always confirm with your local council before assuming work is exempt — getting this wrong can create serious problems when you sell your property or make an insurance claim.
Even where consent is not required, the work must still comply with the Building Code and be carried out by a licensed drainlayer.
Your Responsibilities as the Homeowner
Even though your drainlayer can manage the inspection process, as the owner of the property you remain ultimately responsible for ensuring consented work receives a Code Compliance Certificate. A few things to keep in mind:
- Make sure your drainlayer is currently licensed — you can verify this on the PGDB website
- Confirm in writing (ideally in your contract) that the drainlayer will manage consent applications and inspection bookings
- Keep copies of all consent documents, inspection records, and the final CCC — you'll need these if you sell or refinance
- If your drainlayer is also acting as an LBP for the project, check their licence on the Licensed Building Practitioners register
When to Call a Professional
Drainlaying is restricted work in New Zealand — it is illegal for an unlicensed person to carry out, supervise, or certify drainage work that connects to the public wastewater or stormwater network, or involves on-site wastewater systems. This applies even if you are the homeowner doing work on your own property. If you're unsure whether your project requires a licensed drainlayer, contact your local council or the PGDB for guidance.
For any drainage project — from a new house connection to a septic tank installation — you should engage a qualified, licensed drainlayer. You can find licensed drainlayers in your area right here on tradedirectory.co.nz.
Safety note: Drainage trenches can be hazardous. Trench collapse is a serious risk. WorkSafe NZ sets out requirements for safe excavation practices — another good reason to leave this work to the professionals.
Certifying Drainlayer
