Site work is the part of a project with the most unknowns per dollar. Excavation is a volume, demolition is a weight and a disposal cost, foundations are a volume with a bearing assumption, and every one of them depends on what is underground, which nobody knows until it is open. The estimating discipline is therefore less about precision and more about stating assumptions clearly enough that the discovered condition is a priced instruction rather than an absorbed loss.
Measure volumes, then state the assumption a demolition estimator skips
Cut and fill by volume, disposal by weight or load, foundations by volume with the bearing and depth assumed. Write the assumption on the estimate: the depth allowed, the material expected, what happens if rock or made ground is found. A demolition estimator that produces a number with no assumptions produces a number that cannot be defended.
Disposal and access are the lines that move foundation estimates
Tipping costs, haul distance, and whether a machine can reach the work at all. Foundation estimates on a tight urban site and on an open plot with the same volume are different jobs, and access is the difference.
Fence quoting software and irrigation estimating software: the trades that follow
Irrigation estimating software, fence quoting software and a fencing estimate all work on the same ground with the same unknowns: post holes and trenches find whatever excavation found. Software for trades and software for tradesmen helps most by keeping your own rates and assumptions consistent across all of it, rather than by any clever calculation.
Questions people ask about site work estimating
How should rock be handled in an estimate?
As an allowance with a rate beyond it, stated in words. Rock is the classic discovered condition and the classic absorbed loss, and a single sentence prevents it.
What is the most common site work underestimate?
Disposal and haul, followed by the time lost to access. Both are knowable at survey and both are routinely assumed away.
Does software for tradesmen help small site work firms?
It helps with consistency and with the record: the same rates, the same assumptions, and a job history you can price the next one from. The calculations themselves are not the hard part.