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Rehab Contingency Calculator
Size the right contingency buffer for a rehab project based on scope risk. Combines a percentage buffer with a separate line for known-unknowns to keep your margin intact when surprises hit.
items you know you don't yet know
Total rehab budget
$75,000
base + contingency
Total contingency
$10,000
% + known-unknowns
% contingency only
$6,500
Suggested contingency
12%
$7,800 for this scope
Reading the number
Mixed rehab — kitchens, baths, some mechanicals. 10–15% contingency is the safe range.
Contingency is the buffer for the cost overruns you don't yet see. The bigger the project and the older the structure, the more contingency you should reserve. Beginning flippers consistently under-budget contingency and end up with thin or negative margins.
EveryCalc calculators are designed for fast, practical estimates with transparent inputs and no required account. We use plain formulas, visible assumptions, and related tools so visitors can check the result from more than one angle.
Results are informational only. For financial, tax, legal, medical, construction, or other high-impact decisions, verify the output against primary sources or a qualified professional.
Learn more about our review process on the EveryCalc methodology page.
How this calculator works
What this page estimates
This Rehab Contingency Calculator is built to give a quick, browser-based estimate for rehab contingency. Size the right contingency buffer for a rehab project based on scope risk. Combines a percentage buffer with a separate line for known-unknowns to keep your margin intact when surprises hit. The inputs stay on the page during normal use, and the result should be treated as an estimate for planning, comparison, or education rather than professional advice.
Calculation approach
The calculator applies the standard relationship implied by the inputs, then formats the answer so it can be checked and reused. For finance tools, the most important step is using consistent units, rates, time periods, and assumptions before comparing the result with another calculator or outside quote.
Example workflow
For example, start with a realistic value you already know, change one input at a time, and watch how the answer moves. That makes it easier to tell whether the result is being driven by the main amount, the rate, the time period, or a unit conversion.
Practical checks
- Use current, real-world numbers when the result affects money, health, tax, or legal decisions.
- Run a low, base, and high case when the inputs are estimates.
- Check the related calculators below when the next decision depends on a different assumption.
How to interpret the rehab contingency result
Best use
Use the result as a planning number for comparing payments, rates, returns, tax reserves, or cash-flow choices before you request a quote or make a commitment.
Cross-check
Compare the answer with the contract, lender estimate, tax form, brokerage statement, payroll record, or invoice that will control the real-world outcome.
Watch for
Do not rely on a single optimistic rate, return, or fee assumption. Money pages work best when you run low, base, and high cases and keep professional advice separate from the estimate.
This page belongs to the Finance calculator library, so the answer should be read in the context of the decision you are modeling rather than as a universal rule.
Before relying on this rehab contingency estimate
Most calculator mistakes come from the inputs, not the arithmetic. Use this short audit before you reuse the answer in a spreadsheet, quote, application, or important conversation.
Confirm source numbers
Match balances, rates, fees, taxes, income, and payment dates against the lender quote, payroll record, tax form, statement, invoice, or contract.
Separate cash flow from total cost
A lower monthly payment can still cost more over time if fees, interest, taxes, or a longer term are hidden in the structure.
Run conservative cases
Test at least one higher-cost or lower-return case before using the output for a purchase, refinance, investment, loan, or tax decision.
Rerun this page when the rate, price, term, fee, tax rule, income, expense, or expected holding period changes.
How to Use
- Enter the base rehab budget — your line-item estimate before contingency.
- Enter the contingency percentage you plan to add (8–20% based on scope).
- Enter a known-unknowns dollar amount for items you can predict will surface (electrical updates, roof patching, foundation cracks).
- Pick the scope risk level for the suggested contingency benchmark.
- Read the total rehab budget that includes the buffer.
Frequently Asked Questions
Why have separate % and known-unknowns lines?
Percentage contingency handles the unknown-unknowns — surprises that don't show up until walls open. Known-unknowns are items you suspect from inspection but haven't fully scoped (often $500–$5,000 each).
What contingency does a typical flipper use?
10% on cosmetic rehabs. 12–15% on mixed mechanicals. 15–25% on heavy structural or 100+ year old homes. Lenders often require minimum 5–10% contingency in the loan budget.
Should I tell the contractor about the contingency?
No — that just becomes the budget. Hold contingency separately and only release it when actual overruns occur or when scope expansion is justified.
What if I don't use the contingency?
It adds to your profit at sale. That's the point — it's insurance against worst case. Most flips spend 50–100% of contingency; a clean project might leave 25%+ unused, which is great.
Related Calculators
Rehab Budget Calculator
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Flip Holding Cost Calculator
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Profit per Deal Calculator
See how contingency consumes margin.
ARV Calculator
Pin ARV before testing whether contingency leaves profit.
Hard Money Loan Calculator
Most hard money loans require contingency in the budget.
Flipping Profit Calculator
Run the full flip with rehab + contingency + carry.
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