Tree roots in drains in the Redlands
Updated October 2026
Roots do not break into a sound pipe looking for water. They find a joint that is already weeping, send in fine feeder roots, and then thicken up inside the pipe where there is moisture, air and nutrient. Over a few seasons that becomes a mat across the bore that catches paper and waste until the line blocks. Redlands Blocked Drains connects you with QBCC-licensed local drain plumbers who clear root blockages across the Redlands.
Why this is the defining drain problem of the old bayside suburbs
The combination that produces root blockages is a jointed clay pipe and a mature tree, and the Redlands has both in quantity in the same places. The bayside spine from Thorneside through Birkdale, Wellington Point and Ormiston to Cleveland, and down the coast through Victoria Point to the old Redland Bay village, was developed from the post-war years onwards. Vitrified clay and earthenware sewer and stormwater line was laid in short sections with a joint every metre or so, and ground movement over decades has opened those joints.
Above them are the street trees and the garden trees: eucalypts, figs and melaleucas along the old roads, and the big established plantings that make Ormiston and Wellington Point look the way they do. Alexandra Hills gives you the same thing in a different form, street after street of consistent 1970s and 1980s subdivision where the line, the trees and the age of the problem are the same the whole way down.
Thornlands and the newer estates behind Redland Bay largely sit this one out. PVC with rubber-ringed joints does not weep the way a clay joint does, and the trees are young. If you are in a newer estate and someone has told you the problem is roots, ask to see the footage.
The signs
- A drain that clears and blocks again on a cycle of months rather than years
- Gurgling across several fixtures, worse in the wet season when roots are active
- The overflow relief gully overflowing after heavy rain
- Slow drains that get noticeably worse as the garden grows
- Paper and waste backing up at the same place every time
How it is fixed, and what we will not offer
The pipe gets cleared and the tree stays. That is not a soft option, it is the correct one here.
- Jet blasting cuts the root mass out and cleans the pipe wall, which is the difference between a drain that runs for years and one that runs for months.
- CCTV shows how much damage the roots have done, where, and how deep. Roots that have simply grown through an open joint are a different problem from roots that have cracked the pipe.
- Relining seals the joints from inside with a cured resin liner, so there is nothing for the roots to get into. This is the lasting fix for a root-infested clay line, and it is usually done without digging up the yard.
What nobody on this site will offer is to cut your tree down, grind out the stump or trench a root barrier through a protected tree's root zone. The Redlands is one of the most significant koala areas in South East Queensland. Most of the mainland sits inside the state's koala habitat area and koala priority area mapping under the Planning Regulation 2017, where interfering with koala habitat in a koala habitat area within a koala priority area is prohibited development and outside a priority area is assessable development. The Nature Conservation koala conservation plan applies its own sequential clearing rules and requires a koala spotter when clearing koala habitat trees over a set trunk diameter. On top of the state controls, the council runs an environmental significance overlay in the Redland City Plan and a local law protecting vegetation on private property, with its own approval requirement.
So tree work here is a permit question, often with an answer of no, and the contractor confirms what any particular job needs before quoting. Clearing roots out of a pipe and relining it is ordinary drainage work, it keeps the tree, and it solves the actual problem.
What it costs
Tree root clearing typically runs $250 to $600 in the Redlands. A CCTV inspection to see the damage typically runs $249 to $600, or $350 to $900 bundled with jetting. Relining a damaged section typically runs $3,000 to $8,000 and up depending on length and depth. Set against repeated $300 clears every six months, relining usually pays for itself in a few years, and the cost guide sets out the comparison.
Frequently asked questions
Can I pour copper sulphate or root killer down the drain?
Foaming root treatments slow regrowth in a line that has already been mechanically cleared. They do not clear an established mat, they do nothing about the crack that let the roots in, and they have to be used according to the label. They buy time rather than fixing anything.
Whose tree is it if the roots are from next door?
Roots do not respect boundaries and the pipe is still yours to maintain. The practical answer is almost always to fix the pipe rather than argue about the tree, particularly here where tree work needs approval.
Will relining really stop it?
A properly installed liner leaves no open joint for roots to enter in the lined section. Roots can still find an unlined section further along, which is why the camera survey before the work matters.
Does this happen in stormwater lines too?
Often, and sometimes worse, because stormwater joints can be looser. Same approach: clear the roots, camera the line, reline if the pipe is damaged.
I am on the islands with no sewer. Can roots still be the problem?
Yes, in the drain lines running to the tank and in the disposal field. The system is all yours, so the diagnosis runs differently. See the septic and on-site wastewater page.