These get used interchangeably and they are not the same job. Grinding chips the tree stump down below ground level with a stump grinder and leaves the roots to decay. Full tree stump removal digs the whole thing out. One costs a few hundred dollars and takes an hour; the other needs an excavator and leaves you with a hole. Both are part of our stump grinding and removal service, and most homeowners only ever need the first.
Which you need comes down to a single question: what is going over the top?
Quick answer
- Lawn, garden or nothing: grinding. 150–300mm deep. A few hundred dollars.
- Paving, driveway or fence line: grinding, deeper — 300–450mm.
- Building platform or services: full removal by excavation. Grinding is not enough.
- Replanting in the same spot: full removal gives the new tree a much better start.
- Cheapest time to do either: while the tree crew is still on site.
- Cost detail: see the stump grinding cost guide.
On this page
What each one actually involves
Stump grinding
A machine with a rotating wheel studded with carbide teeth works across the stump in passes, chipping it progressively down below ground level. The wider root system stays in the ground and decays naturally over several years.
It is quick — most residential stumps take under an hour — comparatively cheap, and it leaves the surrounding ground largely undisturbed. For the overwhelming majority of residential jobs, this is the right answer.
Stump removal
The stump and its major structural roots are extracted entirely, usually with an excavator. What you get afterwards is a substantial hole needing backfill and compaction, and a working area that has taken a beating.
It is significantly more expensive, needs machine access, and disrupts everything around it. It is a construction requirement rather than a gardening one.
| Grinding | Full removal | |
|---|---|---|
| Typical time | 30–90 minutes | Half to full day |
| Typical cost (incl. GST) | $175–$500 | $800–$3,000+ |
| Site disruption | Minimal | Significant |
| Access needed | Side gate width | Excavator access |
| Result | Stump gone, roots remain | Stump and main roots gone |
| Roots | Left to decay; surface roots ground on request | Main roots dug out |
| Afterwards | Backfilled with grindings | Large hole to backfill |
| Suitable for building over | No | Yes |
How deep you need to go
Grinding depth is not a fixed figure, and this is the detail that most often goes wrong. Tell whoever is quoting what the area will be used for.
| End use | Depth | Why |
|---|---|---|
| Lawn or turf | 150–300mm | Enough soil for turf roots and safe mowing |
| Garden bed | 200–300mm | Room for topsoil and shallow planting |
| Paving or patio | 300–450mm | Clear of the compacted base course |
| Driveway | 300–450mm | Decay below this settles and cracks the surface |
| Fence line | 300–450mm | Post holes need clear ground, not root mass |
| Building platform | Full removal | Decay under a foundation causes settlement |
| Service trench | Full removal | Roots obstruct the trench and future access |
Grinding a stump to lawn depth and then deciding six months later to pave over it. The grindings and remaining stump will decay and settle under the paving, and you end up lifting it. If there is any chance of a hard surface going there, grind deeper now.
What happens to the roots after grinding?
The roots stay where they are and rot. Once the stump is gone the root system has nothing feeding it, so for most species it stops growing and slowly decays over the following years. You rarely need to dig the roots out. The exceptions are surface roots crossing a lawn or a paving line, and anywhere a slab, trench or new planting hole is going in.
- The root plate under the old stump breaks down over several years, helped along by wood-decay fungi. Expect the ground above it to settle a little as it goes, so a top-up of soil is normal.
- Surface roots that ripple a lawn can be ground out along their length at the same visit. Say so when you ask for a quote, because it adds time.
- Regrowth stops for most trees once the stump is ground below the root collar. Strongly suckering species such as poplar can keep sending up shoots from the remaining roots for a season or more; cut them off as they appear and the roots eventually run out of energy.
- Roots near drains and foundations are a separate question. Our guide to roots near pipes and foundations covers when they matter.
Is it cheaper to grind or remove a stump?
Grinding is almost always the cheaper option. A typical residential stump costs a few hundred dollars to grind, while digging out the stump and its main roots usually runs $800–$3,000 or more incl. GST. The gap comes from the equipment and the aftermath: grinding needs one small machine and leaves the hole filled with its own grindings, whereas excavation needs a digger, a truck for the spoil, then backfill and compaction.
Timing matters almost as much as method. If the stump is ground while the crew is already there for the tree removal, you avoid paying for the machine to come out a second time, and on a small stump that second trip can cost more than the grinding. Prices by stump size, minimum charges and multi-stump rates are all in the cost guide linked in the quick answer above.
Can you just leave it?
Often, yes. A stump tucked at the back of a section will rot down over five to fifteen years depending on species and conditions, and that is a perfectly reasonable choice. It costs nothing and, if it is out of the way, harms nothing.
If you want it gone faster without a machine, there are slower DIY routes, from digging out a small stump to stump rotter granules. They take effort or patience, and we lay out the options in how to remove a tree stump yourself.
It becomes a problem when:
- It sprouts. Gum, wattle, willow, poplar, privet and tree lucerne all regrow vigorously from a cut stump. Cutting the regrowth repeatedly does not stop it; grinding does.
- It is a trip hazard. Low stumps vanish under lawn and become genuinely dangerous — a real issue on rental properties and anywhere children play.
- It is in the mowing line. Working around a stump forever is its own small tax.
- It attracts decay fungi near a building, or near other trees you want to keep, since some decay organisms spread through root contact.
- Something is going there. Deck, shed, path, fence, driveway, planting.
- You are selling. A stumpy back lawn reads as deferred maintenance at an open home.
What happens to the grindings
Grinding produces a surprising volume of material — a mix of wood chip and soil, usually more than fills the hole it came from.
Three options:
- Leave and level (the default). Grindings go back into the hole and are raked flat. Tidiest result for most gardens, and free. The area will settle over the following months as material decomposes, so expect to top it up.
- Cart away and backfill with topsoil. Costs more but gives you ground you can immediately turf or plant.
- Keep as mulch. Fine for paths and around established shrubs.
Decomposing wood chip ties up nitrogen as it breaks down, which starves new plantings. If you are replanting the area, remove the grindings and backfill with topsoil — or wait a season and add fertiliser.
Access and ground conditions
Two things determine whether a stump can be ground properly.
Getting the machine there
Narrow-access grinders are built to pass through a standard side gate, which covers most Auckland villa, bungalow and townhouse sections. Steps, steep drops and very soft ground are the real obstacles — on a saturated site in Takanini or a stepped bush section in Titirangi, positioning the machine can take longer than the grinding.
Can you grind it yourself? A hired walk-behind grinder is fine for small stumps at lawn depth, and plenty of people use one when landscaping a back yard. It won’t reach paving depth, though, and it struggles once the stump size goes much past 300 mm. The trade-offs are set out in hiring a stump grinder vs paying a pro.
What is underneath
Rock is the limiting factor in parts of Auckland. Around Mt Eden, Māngere and the volcanic cones generally, basalt often sits close to the surface, and a grinder can only go as deep as the ground allows. A competent operator will tell you the realistic achievable depth before you commit — which matters enormously if you are planning to pave.
Buried services are the other one. Irrigation, garden lighting, drainage and cabling all live at exactly the depth a grinder works. Point out anything you know about.
Ready to clear it? Get a stump quote. Most straightforward stumps can be priced without a site visit — send us the diameter, the access and what is going over the top.
Indicative NZD ranges for the Auckland market, incl. GST. Confirm structural requirements with your builder or engineer. See our disclaimer.
Frequently asked questions
What is the difference between stump grinding and stump removal?
Stump grinding uses a machine with a rotating cutting wheel to chip the stump down below ground level, leaving the root system in place to decay naturally. Stump removal extracts the stump and major roots entirely, usually with an excavator, leaving a large hole to be backfilled. Grinding is faster, cheaper and far less disruptive; full removal is only necessary when the ground below will be built on or excavated.
How deep should a stump be ground?
It depends what is going over it. For lawn or garden, 150–300mm below grade is enough. For paving, a driveway or a fence line, 300–450mm is a sensible target. For a building platform or a service trench, grinding is generally not sufficient at all — the stump and structural roots need full excavation. Tell your arborist what the area will be used for and they can grind to suit.
Should I remove the roots after grinding a stump?
Usually not. Once the stump is ground out, the remaining roots have no tree to feed them and decay in the ground over the next few years. The ones worth dealing with are surface roots running across a lawn or a planned paving line, which can be ground out along their length, and any roots where a slab, trench or new planting hole is going. Expect the ground to settle slightly as the roots rot.