Most developers who have been disappointed by a quantity surveyor were not let down by the
arithmetic. They were given a figure and left to work out for themselves what it meant.
Measurement is a technical discipline with published standards behind it, and it is done to a
consistent quality by most of the profession. That is precisely why it is the wrong thing to buy on
its own. Two surveyors measuring the same drawings will produce broadly the same quantities. What
separates them is whether anybody tells you which of the assumptions behind those quantities is
fragile, what happens to the figure if the ground turns out differently, and whether the decision
you are about to take is the right one at all.
The pattern repeats. A cost plan arrives as a spreadsheet with a total at the bottom and no
statement of what it excludes. A tender report ranks four bids by price without normalising the
qualifications that make them incomparable. A monthly valuation certifies close to what was applied
for, because checking it properly takes longer than the fee assumed. None of that is incompetent.
All of it leaves the developer holding a number they cannot interrogate.
The second failure is timing. A surveyor brought in to measure a finished design is doing
arithmetic on decisions that were taken months earlier, when they could still have been changed
cheaply. By the time the quantities exist, the structural solution is fixed, the specification is
written and the procurement route is chosen. Every one of those decisions moved the cost more than
the measurement ever will.
The third failure is the report that cannot be acted on. A monthly document that states a
certified figure, a forecast and a variance, with no view on which of those numbers is soft and
what would close it, describes the past accurately and helps with nothing. What a developer needs
each month is short and awkward: what has moved, what is going to move, and what decision is now
due. That is a harder document to write, because it commits the person writing it to a position.