General construction: budget, finance, project types
How to size a construction contingency
A contingency is money held for risks that are known to exist but not yet priced. Its size should follow the risk in the project, not a fixed habit, and it should be spent only on defined things.
A contingency is money held for risks that are known to exist but not yet priced. Its size should follow the risk in the project, not a fixed habit, and it should be spent only on defined things.
What contingency is for
Contingency covers the gap between what you know and what you will learn. Ground conditions, hidden damage in an existing building, price movement on materials not yet bought and design completion all fall in this gap. It is not a pool for upgrades.
Size it from the risks
Instead of choosing a number first, list the main risks and rate each for likelihood and cost effect, then size the fund to the exposure you are actually carrying.
| Driver | Pushes contingency up when | Pushes it down when |
|---|---|---|
| Design completeness | Drawings are early or incomplete | Fully detailed and coordinated |
| Site knowledge | No soil report, unknown utilities | Surveyed and tested |
| Existing structure | Renovation with concealed areas | New build on a clear site |
| Procurement | Prices not locked, long lead items | Fixed-price quotes in hand |
| Program | Tight dates, weather exposure | Realistic float built in |
Hold it in tiers
Many owners keep two buckets: a design contingency that reduces as drawings finish, and a construction contingency that reduces as work completes. Separate lines make it clear what each is for and when it can be released.
Rules for spending it
- Spend only against a recorded event, with the cost and reason written down.
- Get a written change order before work begins.
- Report the remaining balance at each milestone.
- Do not top up other lines from it silently.
Quick answers
- Is there a standard contingency percentage? Rules of thumb circulate, but none replaces looking at your own project. Less design detail, unusual sites and tight programs justify more. Ask your cost consultant to explain the basis they use.
- What should contingency not be used for? Upgrades and scope additions. Those are decisions and belong in the budget or a change order. Contingency covers unforeseen conditions and pricing risk.
- Does contingency shrink over time? It should, as risks pass. Foundation work completed without surprises is a risk retired and its portion can be released or reallocated.
This guide is general information. Confirm structural, legal, financial and permitting questions with qualified professionals and the local authority, and use written quotes for any commitment.
Questions people ask
Is there a standard contingency percentage?
Rules of thumb circulate, but none replaces looking at your own project. Less design detail, unusual sites and tight programs justify more. Ask your cost consultant to explain the basis they use.
What should contingency not be used for?
Upgrades and scope additions. Those are decisions and belong in the budget or a change order. Contingency covers unforeseen conditions and pricing risk.
Does contingency shrink over time?
It should, as risks pass. Foundation work completed without surprises is a risk retired and its portion can be released or reallocated.
Sources and further reading
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