From connecting new subdivision pipework into live public sewer mains to installing manholes and lot connections, we handle the full drainage scope. Service trenching and testing are included.
We are Christchurch City Council authorised, so every stage is built and signed off to council standards.


Subdivision drainage sets the pace for everything that follows. Roading, services and titles all wait on it. Our licensed drainlayers install wastewater and stormwater mains, manholes, sumps and lot laterals to your engineering plans on single and multi-stage developments across Christchurch and Selwyn.
We own and operate our own excavators, so we’re never waiting on a hire yard. We work alongside your civil contractor and engineer, book council inspections as we go and keep you updated at every stage.
Once the pipework is in we test every line and supply CCTV footage and as-built records in the format council needs. You get one reliable point of contact and a clear path to 224(c) sign-off.
Wastewater and stormwater mains, manholes and lot connections to council standards.
Drainage for light commercial and industrial sites, built around your programme.
Shared trenches for water, power and telecom, laid alongside the drainage.
CCTV footage and as-built records supplied in the format council needs.
Discount Drainage is a locally owned drainlaying company in Sydenham that installs sewer, stormwater and water services for subdivisions across Christchurch and Selwyn. Our licensed drainlayers work directly with developers, civil contractors and engineers from site set-out through to council sign-off.
It covers wastewater and stormwater mains, manholes, sumps, lot laterals and connections into the public network, along with service trenching, pressure testing and CCTV inspection.
Yes. Connections to the public network in Christchurch must be made by a council authorised drainlayer. Discount Drainage is Christchurch City Council authorised.
It depends on the number of lots, ground conditions and how the stages are programmed. We’ll give you a realistic timeframe up front and keep the work moving with our own crews and machinery.
Cost depends on the size of the development, pipe depths, ground conditions and the scope of services. Send us your engineering plans and we’ll provide a clear, itemised quote.
Yes. We regularly work alongside civil contractors and engineers, coordinate inspections with council and keep everyone updated as each stage is completed.
Yes. Our drainlayers are licensed and we are Christchurch City Council authorised, so every stage is built and signed off to council standards.
Before a single house went up at Oliver Grove in Halswell, we had already finished the excavation and drainage for all 26 homes.
Several service lines in one trench, each with its own fittings and connections, and every one had to be right before the site could be built on.
A steep residential site with the foundations already underway, where the drainage had to be planned around the slope.
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