Why your contingency budget is higher than it needs to be

Clients don't always feel the cost of poor early definition, but it's there.

Cost overruns don't always show up as overruns. Sometimes they get quietly absorbed by the contingency budget. This may look ok on paper, until you think about what contingency is actually for.

Contingency is an amount of money reserved to cover unforeseen project costs. Not issues that were always going to need resolving but haven't been yet.

In practice it ends up covering both. And the percentage reflects that.

Less defined scope means higher uncertainty. Higher uncertainty means higher contingency.

The problem is that a lot of what sits inside that uncertainty was never actually unforeseeable. It was just unresolved at the point the budget was set.

A scope that isn't defined tightly enough will generate questions later. Specialists who were always going to be needed get appointed mid-design, when their input changes things that have already been drawn.

It's the same with technical assumptions that were never verified. Groundwater levels recorded in a summer investigation may not reflect what the contractor finds on site. If that gap is not identified early, the design is based on conditions that do not match construction reality.

Junction approvals that were programmed optimistically take longer and need more than anyone budgeted for.

Retaining walls not accounted for in the earthworks model will eventually be needed. Finding that out late costs more than finding it out early.

None of that is bad luck. It is deferred certainty. And deferred certainty has a cost.

That cost doesn't disappear. It gets absorbed. It sits in the contingency alongside the things that genuinely could not have been known, and the two become indistinguishable on a cost report.

So a chunk of the client's budget isn't protecting the project from genuine unknowns. It's covering the parts of early definition that weren't checked.

Get the early definition right and you don't just reduce risk. You reduce the contingency needed to cover it. That's money the client keeps.