About the Renovation ROI Calculator
Before spending on a kitchen, bathroom or extension, it's worth comparing what you'll spend against what it's actually likely to add to your property's value. This calculator takes your renovation budget and an estimated value uplift, then shows the net gain and return on investment (ROI) as a simple percentage.
How it works
- Net gain = estimated value uplift − renovation cost.
- ROI = net gain ÷ renovation cost, expressed as a percentage.
- A positive ROI means the renovation is expected to add more value than it costs; a negative ROI means the spend is unlikely to be recovered in resale value alone.
Assumptions and behaviour
- The value uplift figure you enter is the key assumption — this calculator doesn't estimate it for you. Base it on a local agent's appraisal, recent comparable sales of renovated vs unrenovated properties, or a valuer's opinion.
- Assumes the renovation is completed as budgeted, with no cost overruns.
- Doesn't account for how long you hold the property after renovating, or the time value of money.
Limitations
- Many renovations — especially personal lifestyle upgrades like a pool or home theatre — add less resale value than they cost, even though they're worth it for enjoyment. This tool measures financial ROI only.
- Doesn't include selling costs (agent commission, marketing, stamp duty if buying elsewhere) if you plan to sell shortly after renovating.
- Value uplift estimates are inherently uncertain — treat the output as a planning guide, not a guarantee.
Privacy
The calculation runs entirely in your browser. Nothing is uploaded or stored.
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