Stumps and roots: three different jobs, three different prices

Who this is for

• Anyone left with stumps after clearing or tree removal
• People preparing ground that will be built on, ploughed, or driven over
• Landowners comparing quotes that use these three words interchangeably

The short answer

Grinding chews the visible stump and the top of the root plate down below grade, leaving the wider root system in the soil. Extraction pulls the stump and root ball out, leaving a hole. Grubbing removes the root mass from an area as an earthwork operation.

Which you need follows from the end use, not from preference. Lawn and pasture usually need grinding at most. Cultivation and construction usually need grubbing. Nothing needs all three.

What changes the answer

• What is going on the ground afterwards
• How deep anything will penetrate the soil — tillage, foundations, trenches
• Stump diameter and species, which drive grinding time
• Soil type, rock, and moisture
• How many stumps, and how they are spread across the area
• Whether the resulting material and holes have to be dealt with

What each operation actually does

The differences are physical, not commercial, and they determine what the ground can be used for afterwards.

How deep is "below grade"?

Grinding depth is a specification, and one that is frequently left unstated.

A shallow grind removes the trip hazard. A deeper grind allows soil over the top for turf. Deeper again may be needed if something is going to be planted or built near the location. Each takes longer and costs more, and "below grade" on its own does not distinguish between them.

Ask for the depth in inches, and state what you need it for. A grinder that goes deep enough for lawn is not necessarily deep enough for a driveway.

Grinding leaves the roots, and that matters sometimes

This is the limitation people discover afterwards.

A ground stump leaves its lateral root system in the soil. For lawn, pasture, and most landscaping that is entirely fine — the roots decay in place over years and nothing above ground notices.

For anything that penetrates the soil it is not fine. Tillage equipment finds roots. Trenches run into them. Foundations sit on soil whose organic content will decay and settle. Where the end use reaches into the ground, grinding is the wrong operation and grubbing is the right one.

The hole, the grindings, and the backfill

Every below-grade operation produces material and a void, and both are frequently outside the quoted price.

Grinding produces a volume of grindings noticeably larger than the stump was, because the material is loosened. Leaving it in the depression is common and usually acceptable, but it will settle and the ground will dip. Removing it is separate work.

Extraction leaves a genuine hole, plus a stump and root ball that has to go somewhere. Backfilling with what came out is not the same as backfilling with compacted material, and if anything is going over the top the difference matters.

What drives the price

Grinding is priced per stump, usually banded by diameter, and often with a minimum charge that dominates on small jobs. Species matters — dense hardwood takes longer than softwood of the same size — and so does what is in the soil around it.

The soil is the hidden variable. Grit and stone around the root collar wear grinding teeth quickly, and a contractor who has hit rock on your soil type before will price accordingly. Rock encountered unexpectedly is a common change-order trigger, so ask how it is handled before rather than after.

Extraction and grubbing are earthwork, priced by machine time. Volume of soil moved matters more than the number of stumps.

Access constrains this more than clearing

Stump equipment ranges from walk-behind machines that fit through a garden gate to tracked units that need a trailer and real room.

The smaller machines reach places larger ones cannot, and take considerably longer per stump. If your stumps are in a back garden with a narrow gate, that constraint sets the machine, which sets the hours, which sets the price. Measure the narrowest point on the route and mention it when requesting a quote.

And before extraction or grubbing: call 811. Below-grade work near buried services is exactly what the locate system exists for.

What drives the cost

Common mistakes

• Buying grinding when the end use required grubbing
• Accepting "below grade" without a depth in inches
• Not asking where the grindings or the extracted material go
• Backfilling a hole with loose spoil under something that will be driven on
• Starting extraction without calling 811

Questions to ask a contractor

• Is this grinding, extraction, or grubbing?
• How many inches below existing grade, and is that enough for what I am doing here?
• What happens to the grindings, and to any extracted material?
• Are the holes backfilled, with what, and is it compacted?
• How do you handle rock if you hit it — and is that a change order?
• What is the price per stump above the largest diameter in this quote?

What to do next

1. Decide the end use first — it determines which operation you need
2. Count and measure the stumps, or at least band them by size
3. Measure the narrowest access point on the route to them
4. Call 811 before any extraction or grubbing

Questions people actually ask