How much contingency should I budget for a renovation?
Set aside a contingency on top of the contractor's price, sized to the risk of the job. Cosmetic work with nothing hidden needs a small cushion; opening walls, floors or an older home's plumbing and wiring needs much more. Many renovators plan on roughly 10% to 20% of the construction cost, and keep it separate from upgrades they choose along the way.
Size it to the risk
| Lower contingency | Higher contingency |
|---|---|
| Cosmetic: paint, fixtures, flooring over sound subfloor | Opening walls, floors or ceilings |
| Newer home with known systems | Older home: wiring, plumbing, framing unknown |
| Fixed-price contract with a detailed scope | Vague scope or allowances for finishes |
| Materials already chosen and priced | Long lead times or volatile material prices |
What the contingency is - and is not - for
- For: rot, outdated wiring, code upgrades and other conditions found once work starts.
- For: price changes on materials not yet bought.
- Not for: upgrades you decide on mid-project. Budget those separately so the cushion is there when you need it.
How to protect your budget
- Get a detailed scope of work and written change-order process before signing.
- Ask the contractor what they expect to find behind walls in a home this age.
- Pay against completed work, not ahead of it.
- Track every change order against the contingency as you go.
Frequently asked questions
Is a 10% contingency enough?
It can be for straightforward work in a newer home. For older homes or projects that open walls, many plan for more.
Should the contractor's bid include a contingency?
Sometimes it does, as a line item or allowances. Ask how unknown conditions are priced so you know what your own cushion must cover.
What happens to unused contingency?
It stays yours. Leave it untouched until the project is complete rather than spending it on extras early.
Calculators and guides
Recommended next step
Price the work, then add a cushion sized to its risk.
Estimate the project and its contingency →Sources and review
No regulator defines these terms; the page follows common industry practice and labels rules of thumb as such.
Where this applies: Not regulated. Investment ratios and budgeting allowances are industry conventions and rules of thumb, not requirements.
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Worked examples use illustrative round numbers, not current market data. Rates, limits and program rules change - confirm current figures with your lender or a qualified professional.
General educational information, not financial, legal, tax or real estate advice. Rules vary by loan program, transaction and location - verify important decisions with qualified professionals.