Project Contingency Calculator
Safe budget = base × (1 + contingency %). New construction 5%, remodels 10-15%, gut renos 20%+.
Result
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How to use this calculator
- Enter your base estimate from quotes.
- Pick project type — be honest about complexity.
- Don't share contingency budget with contractors.
- Treat contingency as held aside, not spendable.
About this calculator
Contingency is what stops a project from becoming a personal-finance crisis. Industry rules of thumb: 5% for new construction (everything is unbuilt and visible), 10-15% for remodels (kitchens, baths reveal hidden problems), 20-25% for full gut renos, 30%+ for historic restorations and structures over 75 years old. Contingency lives in your budget, not the contractor's — they don't see it. If you tell the contractor your max is $80k and you have $70k base + $10k contingency, the bid will eat the contingency.
Frequently asked
Why higher % for older homes?+
Pre-1980 homes: lead paint, asbestos, knob-and-tube wiring, undersized supply lines, lath-and-plaster walls. Each can add $5-15k unexpectedly.
What if I don't use it?+
You're ahead. Don't reallocate to upgrades until project is 90% complete — surprises cluster late.
Different from change order budget?+
Change orders = scope changes you decide on. Contingency = unforeseen conditions. Some teams combine; cleaner to track separately.
Should the contractor know?+
No. Quote them on base scope. If you reveal contingency, expect it to be eaten by "discovered" conditions.
When can I release it?+
After substantial completion when no surprises remain. Many homeowners hold it until punch list is done — that's wise.
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