Clearing and Grubbing a Wooded Lot

The Area You Clear Is Not the Area on the Deed

Parcel area is the number in the title deed. Cleared area is what is left after the retained trees, their protected ground, the wetland buffer, the verge the utility will not let you touch and the strip you promised the neighbour all come out of it. On a treed lot those subtractions are rarely trivial, and they move in the expensive direction: the retained specimens are usually the big ones, and the ground they protect is proportional to how big they are.

The protected radius comes from stem diameter, not from the crown you can see. BS 5837:2012, Trees in relation to design, demolition and construction, sets the root protection area from a radius of twelve times the stem diameter measured at breast height, with the area capped at 707 m² (7,610 sq ft) for a single stem; AS 4970:2025, Protection of trees on development sites, which replaced the 2009 edition, starts its root zone from the same twelve times the diameter. ANSI A300 Part 5 covers the equivalent ground in North American practice as management of trees during site planning, development and construction. Whichever applies, the arboricultural report fixes those circles before the estimate does, and inside them the machine does not go.

Work the arithmetic in the unit the job is quoted in. Clearing crews and mulching heads price by the acre or the hectare, the debris volume comes out in cubic metres or cubic yards, and the parcel arrives as a boundary in feet or metres. Converting once, early, and writing the cleared figure on the takeoff sheet next to the parcel figure keeps the two from being confused later by somebody reading only the deed.

Putting a Cube on the Brush

The workable estimate for everything above the stumps is area multiplied by an average depth: the cleared footprint times a single figure standing in for brush, understorey and root mat together. It is crude and it is defensible, provided the depth is measured rather than assumed and provided nobody expects it to include the stumps, which it does not.

One average across a whole lot is where this method goes wrong. A hedgerow or a tree line carries several times the depth of open scrub, and a lot that is half open grass and half dense understorey run at a single figure will be wrong in both halves at once. Break the plot into zones you can see the boundaries of — treeline, dense understorey, open field, scrub regrowth — take a depth for each, and run them separately. Four small numbers you can defend beat one large one you cannot.

Getting the depth honestly takes a spade and twenty minutes. Cut a square through the litter in each zone, down to where the fibrous roots stop and mineral soil begins, and measure the face. Do it in more than one place per zone, because the number under a mature canopy is not the number ten metres out from it. Where the lot has been farmed, grazed or previously cleared, expect the mat to be thin and the surprise to come from buried debris instead.

Remember what state the answer is in. Area times depth gives the material as it lies, packed by years of its own weight. Cut brush going into a trailer occupies several times that, and chipped material lands somewhere between the two — the same cube can arrive as one loose figure through a chipper and a much larger one if it is loaded whole. Decide which of those the number is feeding before it goes anywhere near a truck count.

1. Walk the lot and mark its vegetation zones on the plan, not by ownership boundaries but by what is actually growing — treeline, dense understorey, scrub, open grass.
2. In each zone, cut a clean spade face through the litter and root mat down to mineral soil and measure the depth on the face, repeating it at least twice per zone.
3. Record the zone area and its measured depth as a pair, and run the volume per zone rather than a single figure for the whole plot.
4. Add the zone volumes for the clearing total, and keep the stumps out of it — they are counted separately and they weigh differently.
5. Note on the sheet which state the total is in: in situ as measured, or loose as it will travel, because the two feed different downstream numbers.

From Heaps to Tonnage

The gate charges by weight almost everywhere, and the takeoff produced a volume, so a density has to be chosen for each stream before the disposal line can be written. There is no single density for "clearing debris": loose brush and a chipped load and a trailer of root balls with soil on them span more than an order of magnitude, and the only sensible move is to convert each stream on its own density rather than the total on an average.

Moisture is the term that catches people. Freshly felled wood carries a great deal of water — green specific gravity and green moisture content by species are published in the USDA Forest Products Laboratory's Wood Handbook, Wood as an Engineering Material, FPL-GTR-190, and the difference between green and air-dried is not a rounding error. Brush cut in March and hauled in March weighs meaningfully more than the same brush windrowed and left through a dry summer. Rain the night before a haul is paid for by the ton at the gate.

Root balls are a soil problem wearing a timber label. Whatever soil the roots hold when the machine lifts them is soil you buy twice — once as the excavation that produced it and again as the tonnage across the weighbridge — and shaking the ball out with the bucket before it goes in the truck is the cheapest weight reduction available on the whole job. It is also the difference between a load the facility calls clean wood waste and a load it calls mixed.

The Gate Rate Is Four Numbers Wearing One Hat

A quoted tipping fee usually turns out to be a per-ton headline rate plus a set of conditions that only appear on the ticket. There is the rate itself, which depends on what the material is classified as. There is frequently a minimum charge that makes a light half-trailer cost the same as a full one. There is, in many jurisdictions, a per-ton state or county solid waste surcharge levied on top of the facility's own rate. And there is the possibility of a different rate entirely — sometimes a nominal one — for clean source-separated wood going to a composting or biomass line rather than to the landfill face.

Check the unit before checking the number. Tipping fees are commonly quoted per short ton where scales report in short tons and per tonne where they report in tonnes, and the two differ by about ten percent — real money across twenty loads, and an error that hides perfectly because both are spoken aloud as "a ton". Enter the weight in the unit the ticket is printed in and price it against the rate in the same unit.

What a load is called is decided at the gate, not in your estimate. A trailer of clean chip is one thing; the same trailer with root balls, soil, a length of old wire fence and the remains of a shed is mixed construction and demolition waste, at the higher rate, for the whole load. This is the single most common way a clearing job overruns its disposal budget, and the fix is entirely operational: separate at the stockpile, not at the gate, and keep the fencing wire, the tyres and the fly-tipped rubbish that turn up on every wooded plot in their own pile from the first hour.

Confirm all of it with the facility that will actually take the material, including whether they accept stumps at all. Plenty of green waste operations will take chip and brush and refuse whole stumps outright, because a stump jams a grinder, and finding that out with a loaded trailer at the weighbridge costs a full cycle plus the hours the machine stood still waiting for it to come back.

Counting Trailers, Not Cubic Metres

Haulage is bought in loads, and a load ends when either the box is full or the axles are legal — whichever arrives first. On a clearing job the two ends of that rule sit on opposite sides of the yard. Brush and chip cube out with the trailer nowhere near its weight limit, which is why chip vans are large; root balls and stripped organics weigh out with the trailer visibly half empty. Estimating both with one truck capacity produces a count that is wrong twice, in opposite directions.

The legal ceiling is not yours to assume. In the United States, weight limits on the Interstate system run from 23 U.S.C. 127 and the federal bridge gross weight formula, with state limits applying elsewhere on the network; other jurisdictions have their own road transport law and their own permitting for anything above it. That is the haulier's compliance question, but it is your programme that suffers when a truck is turned around at the plate, so it belongs in the conversation before the first load rather than after it.

Access on a wooded plot is its own constraint on load size. The stems come down before there is anywhere for a trailer to turn, so the first movements are frequently made by whatever can reach the stockpile rather than by the most economical vehicle. Getting a pull-through, a hardstanding and a place to stand the trailer established at the start is what keeps the load count from being decided by the geometry of the entrance.

The Tonnage That Never Reaches the Gate

Everything kept on the lot is a load not hauled, a ticket not paid and a cycle not run, which makes on-site processing the strongest lever on the disposal line. Chipping the brush where it falls and spreading it on the parts of the plot that will stay soft is the usual version, and it converts the bulkiest, lightest, most expensive-to-haul stream into a landscape material with a real use. Work out the spread as a depth over an area, the same way any other mulch is bought, and it becomes obvious very quickly how much area a wooded lot's own brush will cover.

There are limits worth respecting. Chip laid too deep holds water against the soil and starves roots of air, so a spread depth in the range extension horticulture guidance gives for mulch is the target rather than whatever depth disposes of the pile. Nothing goes against the trunks of retained trees. Nothing goes on ground that is scheduled to be built on or trafficked, because it is organic material that will have to come off again, at which point you have paid to handle it twice. And fresh chip from a plot with an invasive species problem is a way of spreading that problem across the whole site.

The other routes off the lot are worth pricing before defaulting to the landfill. Merchantable stems may be worth scaling — the Doyle, Scribner and International quarter-inch log rules are the ones a buyer will quote against, and firewood is sold stacked by the cord rather than measured standing. Clean chip is a fuel with a market in some regions. Burning is jurisdictional and increasingly restricted: open burning is regulated by the state or local air authority, permits are conditional on weather and season, and it cannot be planned as though it were a fallback. Where a clearing job also disturbs an acre or more of ground, remember that stormwater compliance under the EPA NPDES Construction General Permit runs in parallel with all of this, and the perimeter controls go in before the first tree comes down.