Renovations run over because people forget the contingency. Enter your estimate and a buffer to see a realistic budget — then plan every line item with the full tracker.
Line-item budget with contingency, estimate vs actual, and running total.
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A common guideline is 10% to 20% of the project cost, leaning toward the higher end for older homes or projects that open up walls, where hidden problems are more likely. Renovations almost always uncover something unexpected — wiring, plumbing, structure — and the contingency is what keeps a surprise from stopping the job. Better to budget it and not need all of it than to run out mid-project.
Usually a mix of underestimated line items, scope creep (deciding to do 'just one more thing' while the walls are open), and genuine surprises hidden until work starts. A detailed line-item budget reduces the first two by making every cost explicit, and a contingency buffer absorbs the third. Tracking estimate versus actual as you go catches overruns early, while you can still adjust.
A ready-to-use spreadsheet (Excel & Google Sheets): a line-item budget with automatic contingency, estimate-vs-actual tracking, and a running total with remaining budget — delivered instantly after checkout. AI-assisted, human-built; not financial advice.
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