Budget the whole project, not just the quote
A contractor's quote rarely covers the full final cost. Adding a buffer up front means a surprise doesn't derail the whole project. Building the savings plan into a broader goal? See the Savings Goal Calculator.
Frequently asked questions
Why add a contingency buffer?
Renovation projects routinely run over budget once a wall opens up and reveals wiring, plumbing or structural surprises. 10-20% on top of your estimate is standard advice from contractors and financial planners alike.
Should I finance the renovation instead of saving?
That depends on the rate you'd pay to borrow versus what you'd otherwise earn on savings, and how urgent the project is. This calculator assumes you're saving up first — if you're comparing to a loan, run the numbers through the Loan Calculator too.
What if my project cost estimate changes?
Revisit this regularly as you get contractor quotes — early estimates are often rough, and the contingency buffer is there precisely because the final number tends to move.
Last updated: June 2026