Drainlaying in Christchurch: what's local
The street is the council's
The city council owns the wastewater pipes, tanks and laterals on public land, from the front boundary of one house to the front boundary of the house opposite. On your side of the boundary, a lateral that serves only your home is yours.
Mains through private land
Some council mains run across private sections. There, the council's share is usually the main itself, the joins where laterals meet it, and roughly the first metre of each lateral. The rest of the lateral is the owner's.
Shared laterals on shared sections
On cross-leases, unit titles and back sections, one lateral can serve several homes. The council treats a lateral serving more than one property as a shared responsibility, so the connected owners share responsibility for repairing it.
Plenty of new building
Stats NZ counts 4,391 new dwellings consented in Christchurch City in the year ended March 2026, after 4,714 in the year ended March 2022. Consents count plans rather than finished homes, but new homes mean new drains.
Repair, reline or relay
A drainlayer will often film the lateral first to find the fault and its depth. Then the options are a dig-and-replace of the damaged length, a no-dig relining, or a new run where the old one can't be saved.
Some of that needs no building consent, as long as an authorised person does it and the result meets the Building Code. Schedule 1 of the Building Act covers repairing a drain with comparable materials, replacing a section with a comparable one in the same position, opening and reinstating a purpose-made access point, and minor alterations such as moving a gully trap. A new connection to a council service is outside those exemptions, so talk to the council before one is designed.
If the fault is on the council's section
Your drainlayer is the one who works out whether a problem sits on the private or the public part of the lateral. If it's public, the council wants evidence of a structural fault before it steps in. Recorded footage showing that fault, accepted by the council's reviewer, is what gets your costs reimbursed, so make filming part of the job from the start.
In a pressure sewer area, the pipe from the house to the tank is the owner's. In a vacuum sewer area, the council checks its system before a drainlayer is called.
Licences and self-certification
Laying, repairing, opening up or renewing a drain, and fixing or unfixing a gully trap, is drainlaying, and the person doing it must be authorised by the PGDB for drainlaying in particular. A plumbing licence alone doesn't cover it. A certifying drainlayer can work unsupervised and certify work; the Drainlayer class works under a named certifying supervisor.
Self-certification is new. A certifying drainlayer who has applied for and received the PGDB's endorsement (applications opened on 7 September 2026) can certify eligible consented work in place of council inspections, lodging a certificate of compliance with the PGDB and giving it to you within 10 working days. The building consent is still needed, and you must tell the council in writing about an endorsed drainlayer who wasn't named on the application. Our certificates guide explains the different documents.
Questions for a Christchurch drainlayer
- Where exactly is the fault, and is it on our section or the council's?
- Is the lateral ours alone, or shared with neighbours?
- Does this repair fit a Schedule 1 exemption, or does it need consent?
- Will you self-certify, or will the council inspect?
- What documents will I receive when the work is completed?
What we would do
Ask for the footage before you ask for a price. It shows where the lateral is damaged, whether that's your section or the council's, and whether relining is possible. If you share the lateral, talk to the neighbours before the work is booked. For a new build or a second dwelling, involve the drainlayer early, because a new connection to the council's sewer falls outside the consent exemptions.