Blocked drain clearing in Christchurch
Slow showers, gurgling toilets and gully traps backing up onto the lawn. We clear the blockage and tell you why it happened — and if the fix turns out to be drainlaying work, we'll arrange a drainlayer for you.
The signs, in the order they usually show up
Drains rarely block all at once. They tell you first, and the earlier you call the cheaper the job:
- A shower or bath that drains slower than it used to. The first symptom, and the one most people live with for months.
- Gurgling. A toilet that burps when the washing machine empties means air is being pushed past a partial blockage further down the line.
- Smell. A drain or sewer smell around a gully trap or outside a bathroom wall usually means water isn't moving the way it should.
- Two fixtures affected at once. If the shower and the toilet both play up, the problem is in the shared line, not the fixture.
- Water pooling around the gully trap outside. That's the overflow point doing its job — it's telling you the line past it is full.
Why Christchurch drains block more than most
Two things make this city different, and both of them matter for how a blockage gets fixed.
Old earthenware and clay pipework. A lot of housing through St Martins, Opawa, Beckenham, Sydenham, Woolston and Spreydon still runs on original clay laterals laid in short sections with jointed collars. Those joints are exactly where fine tree roots get in — they follow the moisture, then thicken and hold everything else back. Clearing the roots fixes it for a season; understanding whether the pipe itself has failed is what fixes it properly.
Ground movement. The earthquakes moved a lot of ground, and drainage runs on gradient. A lateral that's dropped, bellied or pulled apart at a joint will keep collecting silt and paper at the low point no matter how many times it's cleared. If a drain in an older eastern-suburbs property has blocked repeatedly, it's worth finding out whether the pipe itself is the problem rather than paying to clear it every winter — and that's the point where a drainlayer and a camera earn their money.
What we do here, and where it stops. Flush & Flow is a certifying plumber and gasfitter, not a registered drainlayer. So we clear blocked drains — which is what the large majority of these calls actually need — and we don't carry out drain repairs, hydro jetting or CCTV camera inspections, because that's drainlaying work and it has to be done by someone registered for it.
If your drain turns out to need any of that, we'll tell you straight away and arrange a drainlayer to pick it up. You still only make one phone call.
What we actually do
- Find the blockage and clear it. Through the gully trap or an inspection point, so we're working on the line rather than through your fixtures.
- Work out why. Roots, fat and grease, wet wipes, a section holding water, or something that fell in. What comes back out tells you a lot.
- Tell you what we found and what it means. Including when the honest answer is "this will block again in six months unless the pipe itself gets sorted".
- Arrange a drainlayer if that's what it needs. Where the pipe has failed, dropped or needs a camera down it, we hand it to someone registered for that work rather than pretending it's ours.
Whose drain is it? As a rule, the private lateral from your fixtures out to the connection point is the property owner's responsibility, and the public main beyond that is the Christchurch City Council's. If the blockage turns out to be on the council side, we'll tell you — you shouldn't be paying us to fix their pipe.
What you can safely try first
Some blockages genuinely don't need a plumber, and we'd rather tell you that than take the callout:
- A plunger, used properly. Cover the overflow, get a real seal, and use steady pushes rather than violent ones.
- Boiling water and dish soap down a kitchen sink that's slowed from fat build-up. Not on a fully blocked line, and never on a toilet — thermal shock can crack the pan.
- Clean the gully trap grate. Leaves and silt sitting in the outside grate cause a surprising number of "blocked drain" calls.
What we'd steer you away from: caustic drain chemicals. They rarely shift a real blockage, they sit in the line, and they make it considerably less pleasant for whoever opens that pipe next — which might be us.
Preventing the next one
- Fat and cooking oil go in the bin, not down the sink. Warm oil pours; cold oil lines the pipe.
- Wet wipes — including the ones labelled flushable — do not break down. Neither do cotton buds or dental floss.
- Hair traps in the shower cost a few dollars and prevent most bathroom blockages.
- If you have mature trees near the drain run, expect roots and plan for periodic maintenance rather than waiting for the overflow.
Common questions
How much does it cost to clear a blocked drain in Christchurch?
Most straightforward blockages are cleared inside the first hour, which is $135 + GST including travel on a standard weekday, then $95 + GST an hour after that. If it turns out the pipe itself has failed, that's drainlaying work rather than ours — we'll tell you what we've found and can arrange a drainlayer to quote it.
Why does my drain keep blocking in the same place?
A drain that reblocks in the same spot usually has a physical cause — tree roots at a pipe joint, a section that has dropped or bellied and holds water, or a partial collapse. Common in older Christchurch homes with original clay laterals, and more common again where ground movement has changed the gradient. Clearing it treats the symptom — finding the fault needs a drainlayer with a camera, which we can arrange.
Is a blocked drain my responsibility or the council's?
Generally the private lateral running from your fixtures to the connection point is the property owner's responsibility, and the public main beyond that belongs to Christchurch City Council. If we find the blockage is on the council's side we'll tell you rather than charging you for it.
Are flushable wipes actually flushable?
No. They pass through the toilet but don't break down the way toilet paper does, so they catch on any rough joint, root or bend and build up. They are one of the most common causes of blocked household drains we see.
Do you do drain repairs, jetting or camera inspections?
No. Flush & Flow is a certifying plumber and gasfitter, not a registered drainlayer, so we clear blocked drains rather than repair them. Hydro jetting, CCTV camera inspections and drain repairs are all drainlaying work. If your job needs any of those we'll tell you and can arrange a drainlayer, so it's still one phone call for you.
Should I use a chemical drain cleaner first?
We'd recommend against it. Caustic drain products rarely clear a genuine blockage, they sit in the line, and they can damage older pipework. A plunger or clearing the outside gully trap grate is worth trying; beyond that, call.
Where we work
We're based on Wilsons Road in St Martins and work right across greater Christchurch — including these suburbs and more.