A crack opens above a doorway. The back door starts sticking in summer. The plumber pulls a mat of roots out of the sewer for the second time in a year. And there, ten metres from the house, is a big gum or a row of cypress that has been getting bigger every year. The question we get asked is simple: is the tree doing this, and does it need to come out?

On the clay soils of Werribee and the wider Wyndham area the answer is often "partly", and the fix is not always removal. Here is how it works.

It is usually the soil, not the roots pushing

Tree roots rarely push a house over. What they do is take water, and on reactive clay that matters a great deal.

Much of Werribee, Hoppers Crossing, Tarneit and Point Cook sits on clay that swells when it is wet and shrinks when it dries. Every house moves a little with the seasons. A large tree near the house adds to the drying on one side. Through a long dry summer its roots draw moisture from under part of the footing, the clay shrinks there more than elsewhere, and that part of the house settles. After a wet winter the clay swells back. The result is uneven movement, and uneven movement is what cracks walls.

That is why root damage often shows up seasonally, worse at the end of summer and easing in winter, and why the side of the house nearest the tree tends to show it first.

Signs worth taking seriously

Diagonal cracks in brickwork or plaster running from the corners of doors and windows, especially on the side facing the tree.
Doors and windows that stick or will not latch at one time of year and are fine at another.
Gaps opening between skirting boards and the floor, or where walls meet the ceiling.
Cracked paths, driveways and slabs near the trunk, sometimes lifted by surface roots.
Recurring sewer or stormwater blockages, especially where the pipe runs toward the tree.

Hairline cracks in a new house are common as the building settles and are not automatically the tree. Cracking that grows, reopens each summer, or is clearly worst on the tree side deserves a closer look.

Sewer pipes: roots follow the water

Roots do not break into sound pipes by force. They find the water and nutrients leaking from a joint that has already moved or cracked, grow in through the gap, and then fill the pipe. Older clay sewer pipes with many joints are the most vulnerable, which is why the older streets of Werribee and Werribee South see this far more than newer estates with PVC lines.

The usual signs are a slow toilet, gurgling drains, or an overflowing gully trap. A plumber can camera the line to confirm roots and show exactly where they are getting in. That location matters: it tells you which tree is responsible and whether the pipe itself now needs repair. Clearing the roots without fixing the joint means they will be back.

Your options, from least to most drastic

1. Get the cause confirmed. For wall cracking, a structural engineer or building inspector can tell you whether the movement is consistent with the tree, the soil, drainage, or the footing itself. Leaking downpipes and poor drainage cause very similar cracking on clay and are much cheaper to fix. For pipes, a camera inspection by a plumber.

2. Manage the tree. Crown reduction through our Tree Lopping & Pruning service can reduce how much water a tree draws, though it does not stop root growth on its own and is not a cure on a badly affected house. It suits trees that are only part of the problem.

3. Install a root barrier. A root barrier is a vertical membrane set in a trench between the tree and the house or pipe, directing roots downward and away. It works best when installed before serious damage and when the trench is deep and long enough to intercept the main roots. It lets you keep a tree you value.

4. Remove the tree. Where a large tree is close to the house, the damage is ongoing and the tree has no special value, removal is often the clean answer. One caution on reactive clay: when a big tree that has been drying the soil for years is removed, the clay under the house can swell back over the following seasons, a process called heave. It is worth asking your engineer about it before a very large tree near the footing comes out.

If you remove the tree, grind the stump too. Our Stump Grinding & Removal service takes the stump and the main surface roots out, so it cannot sucker and regrow and the area can be paved or planted.

Check before you cut

Some trees in Wyndham are protected by planning overlays or local laws and need a permit to remove, even when they are causing damage. Our page Do You Need a Permit to Remove a Tree in Wyndham? explains how to check your address, and we flag anything that looks protected before we quote. Trees on the nature strip belong to the council, so raise those with Wyndham City directly.

Send us photos

Photograph the tree, its distance from the house, the cracks or lifted paving, and where the sewer line runs if you know. Tell us your suburb. We will give you a straight read on whether the tree is likely involved, whether pruning, a barrier or our Tree Removal service makes sense, and a no-obligation quote, across Werribee, Hoppers Crossing, Tarneit, Point Cook and the Melton ring.

Are Tree Roots Damaging My House or Pipes? A Werribee Homeowner's Guide