Planning
How Much Renovation Contingency Should You Keep?
Set a reserve based on design completeness, building age and hidden-condition exposure.
Contingency is for uncertainty—not a substitute for an incomplete scope or desired upgrades.
Key takeaways
- Match contingency to uncertainty.
- Do not disclose it as spendable scope.
- Investigate before demolition.
Risk-based ranges
A well-documented cosmetic project may carry lower uncertainty than structural work in an older home. Many owners plan roughly 10% to 20%, but the appropriate reserve depends on investigation and risk. Do not treat a generic percentage as a professional estimate.
Separate owner changes
Track unforeseen conditions separately from upgrades you elect after construction begins. This protects decision-making and reveals whether the original scope was realistic.
Reduce uncertainty first
Complete surveys, open exploratory areas, select products, test hazardous materials where appropriate and coordinate drawings before pricing. Spending modestly on investigation can reduce larger change orders.
Control the reserve
Keep contingency in the owner budget rather than automatically adding it to contract value. Require written description, price and schedule effect before authorizing changes except genuine emergencies.
What to do next
Use our calculators for an initial planning range, then collect property-specific information and written local quotes. For insurance decisions, consult a licensed insurance professional and the complete policy.