Repairs & renovations
Renovation Budget Calculator
Create a complete project allowance with editable labour, material, tax and contingency.
Calculate your result
What this calculator estimates
Plan project costs, tax and contingency. It combines the inputs below to produce Total project budget. Every assumption remains editable so the estimate can reflect the property, financing and location being evaluated.
Worked example
Using the displayed sample assumptions, the calculator produces $51,744. This is an illustration, not a market quote. Change one input at a time to understand what drives the result.
Inputs and assumptions
- Materials — sample input: 18000 currency units
- Labour — sample input: 22000 currency units
- Permits & design — sample input: 2500 currency units
- Other costs — sample input: 1500 currency units
- Contingency — sample input: 12 %
- Local sales tax / VAT — sample input: 5 %
How to interpret the result
Replace sample unit prices with current local quotes. Compare a conservative case with an expected case and keep a record of the assumptions used.
Common mistake to avoid
Do not omit demolition, permits, tax, delivery or contingency. Local definitions, taxes, lending practices and measurement requirements can materially change the result.
Frequently asked questions
How should I choose a contingency?
Use a higher allowance when scope is incomplete, conditions are concealed, access is difficult or the building is older.
Are the sample costs live contractor quotes?
No. Replace unit costs with current local supplier pricing or contractor quotations.
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Reviewed 2026-09-08.