How Much Contingency Should I Budget?

Keep four kinds of money separate

Start with the known scope: measured work, selected materials, expected labor, permits, and project costs. Keep allowances for selections that are not final, a contingency for genuinely unknown conditions, and a separate decision budget for owner-requested upgrades.

• Known work: measured and described in the scope.
• Allowances: defined placeholders for an unresolved selection or quantity.
• Contingency: reserved for conditions that cannot reasonably be confirmed yet.
• Owner changes: elective additions, substitutions, or scope changes.

What makes uncertainty higher or lower?

Uncertainty is often higher when walls or floors will open, existing records are limited, water or structural symptoms are unresolved, access is difficult, or multiple systems depend on one another. It can be lower when measurements, destructive investigation, selections, and trade coordination are complete.

A percentage is not a universal rule and should not be presented as one. Set a written contingency policy: what it can cover, who approves its use, how remaining funds are tracked, and when the budget is revisited.

1. List unknowns by likelihood and consequence instead of hiding them in one total.
2. Resolve high-impact questions before demolition or ordering.
3. Review the contingency after scope, selections, permits, and site conditions change.

Locality disclaimer

Permit requirements, inspection fees, code upgrades, taxes, disposal, labor conditions, and contract rules vary by locality. Verify local requirements and use current written bids for decisions. This page offers budgeting education, not financial, legal, engineering, or construction advice.

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