House Renovation Budget Calculator
Build a renovation budget from your item list with a contingency allowance, permits and optional sales tax.
Your inputs
Results
Total budget
$36,150.00
- Items subtotal
- $31,000.00
- Contingency
- $4,650.00
- Tax
- $0.00
≈Estimate based on the stated model and assumptions
| Item | Cost | Share |
|---|---|---|
| Kitchen | $15,000.00 | 48.4% |
| Bathroom | $8,000.00 | 25.8% |
| Flooring | $6,000.00 | 19.4% |
| Painting | $2,000.00 | 6.5% |
Inputs are never added to links for financial, salary or health calculators.
What this calculator does
Renovations commonly run over budget. Listing each item and adding a contingency gives you a more realistic total.
Formula and method
Worked example
Calculated by this tool with its default inputs:
Inputs
- Items — one per line: description, cost: Kitchen, 15000 Bathroom, 8000 Flooring, 6000 Painting, 2000
- Contingency for surprises: 15 %
- Permits and design fees: 500 (any currency)
- Sales tax / VAT on items (if not included): 0 %
Results
- Total budget: 36,150
- Items subtotal: 31,000
- Contingency: 4,650
- Tax: 0
How to read the results
The breakdown shows which items dominate the budget and where savings would matter most.
Assumptions and limitations
- Older homes often need larger contingencies for hidden problems.
Financial results are estimates based on the inputs and assumptions shown. They are not financial advice; confirm figures with your lender, provider or a qualified adviser before making decisions.
Questions
How big should the contingency be?
10–20 % is common; use more for older buildings or structural work.
Methodology and verification
- Result type
- Estimate based on the stated model and assumptions
- Formula version
- 1.0
- Automated verification
- 2 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
- Editorial review
- Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.
Privacy
Everything you enter is calculated in this browser and is not sent to Numerith or anyone else. Because this calculator can involve personal financial or health details, your inputs are never added to share links or saved to history. Privacy policy