Taking Out What The Removal Left Behind

Grinding a stump and removing a stump are two different jobs

Worth separating, because quotes use both words. Grinding means a machine with a spinning cutter wheel chews the stump down below ground level and turns it into chip. The hole is backfilled, the surface is levelled, and nothing is dug up. It is fast, it does not wreck the surrounding garden, and it is what almost everyone actually wants.

Removing a stump means excavating the whole thing, root plate included, usually with a machine. It leaves a crater, it disturbs everything around it, and it is only worth doing when a footing, a pool shell or a service trench is going through the same ground. If someone quotes you "stump removal" and you expected grinding, ask which one they mean.

Depth is the only specification that matters

This is the number to agree on before work starts, because it is the difference between a job that works and a job you pay for twice.

To turf over or put a garden bed back, roughly 150 to 200mm below the surrounding grade is enough. The stump is out of sight, grass will establish over it, and nothing is going down far.

To replant a tree or a large shrub in the same position, you want 300mm or more, and the lateral flare ground back as well, not just the visible stump. A new root ball needs room and clean soil, and neither exists if the old plate is sitting 200mm down.

To pave, lay a slab or put in a footing, the grinder needs to get below the finished level of the compacted base course. Surface roots running out from the stump get ground off too, because a root left under paving will eventually lift it, and a root decaying under a slab leaves a void.

Tell the crew what is going in over the top and the depth sorts itself out. Do not accept "we'll grind it down" as a specification.

Limestone is the local complication

Fremantle sits on Tamala limestone under shallow sandy soil. Root plates here spread wide across the rock rather than driving down, and a stump grinder frequently finds limestone before it finds the bottom of the roots.

A grinder will eat sand, soil and root all day. It will not cut solid rock, and pushing it into limestone strips teeth quickly enough to turn a cheap job into a dear one. In practice this means two things. On many blocks the rock is actually helping — the plate is shallow, wide and easy to get at. On others a cap of limestone sits partway down and the machine physically cannot go deeper, which is something you get told on the day rather than discovering when the paving cracks. Where that happens, the honest options are to grind to the rock and pave above it, to shift the new planting or the slab a metre sideways, or to bring in an excavator and break the rock out, which is a different trade and a different price.

The same geology is why removals here are quoted on access and ground conditions rather than trunk diameter alone.

Getting the machine to the stump

Access decides which grinder turns up, and which grinder turns up decides how long the job takes.

Much of the residential stock around Fremantle, Beaconsfield and White Gum Valley is limestone-and-iron cottages on narrow lots, with a side path down one boundary and a rear laneway behind. Narrow-access grinders are built for exactly this and will pass through a standard 760mm gateway. Anything wider needs a gate taken off, a fence panel out, or entry from the laneway.

The things worth measuring before you ring are the narrowest pinch point along the route, not the gate itself, any steps or a raised limestone kerb the machine has to climb, and whether the ground between the gate and the stump is firm enough. A soft lawn in winter, a paved courtyard that cannot take tracks, or a stump sitting inside a walled garden with no gate at all will all change the answer — occasionally to a small machine carried in by hand, and occasionally to a crane lift over the roof.

What you are left with

Grinding produces more chip than people expect. A stump that looked like a bucket's worth turns into two, because the timber is fluffed up and mixed with soil on the way out.

By default the chip goes back into the hole and is mounded slightly, because it settles over the following months. It can also be raked out and spread over garden beds as mulch, or carted away for an additional cost. Three things worth knowing: stump grindings are not soil and will not behave like it, they draw nitrogen out of the surrounding ground as they break down, so do not plant directly into them, and a backfilled hole will sink over a season and want topping up.

The part most people do not get told

Grinding takes out the stump and the flare. It does not take out the root system.

The lateral roots stay in the ground. They stop growing — with the stump gone there is nothing to drive them — and they break down slowly over several years. For lawn, garden or paving, that is fine and nobody ever notices. It matters when you are excavating nearby later: a pool shell, a footing, a retaining wall or a service trench dug near an old tree position will hit roots, and that is a cutting-out job, not something grinding already dealt with. Better to know now than to find out with an excavator hired by the day.

Palm root plates are a harder job

Palms are worth pricing separately. A palm does not build a tap root and spreading laterals — it produces a dense fibrous mat of thin roots bound through with sand and grit, and that mat grabs and blunts grinder teeth instead of shearing cleanly. A palm plate of the same diameter as a tree stump takes longer and costs more. The species and the reasons behind it are covered on the palm removal page.

Booking it

Grinding is often done on the same visit as the removal, which saves a second mobilisation, so mention the stump when you first ring rather than after the tree is down. If the tree has already gone and you have inherited the stump, that is a standalone job and the same questions apply: depth, access, and what happens to the chip.

Pricing follows stump diameter, grind depth, access and disposal, and the tree removal cost guide works through the same variables in the order they matter. If there is any question over whether the tree should have come out at all, or whether a neighbouring one is next, an arborist assessment answers it properly. Crews cover Fremantle, East Fremantle and the Melville and Cockburn suburbs listed on the service areas page. Ring 08 7741 1934.