1. Hardwood vs Softwood
Eucalypt, elm, oak, plane tree, camphor laurel — hardwoods take significantly longer to grind than the same-diameter cypress, pine or silver birch. Species is on the quote form for this reason.
2. Root Flare
Some stumps flare out significantly at ground level, or have surface roots radiating out from the trunk. Grinding to a proper depth requires chasing those roots — adds 20–40% grinding time on flared stumps compared to a straight-sided trunk of the same visible diameter.
3. Access
Front-yard stumps with driveway or truck access are cheapest. Rear-yard stumps behind gates need a smaller stump grinder that fits through the opening — smaller machine = slower job. If your side gate is under 800mm, tell us at quote time so we can bring the right size machine.
4. How Deep You Need It Ground
Standard grind: 100–150mm below ground level (fine for turf, garden bed, mulch). Deeper grind for paving or building over the site: 250–300mm below ground level. Deeper grind = more time = higher end of the band.