Retrofit Cost Calculator
Estimate whether an upgrade is worth it. Compares all-in cost against rent uplift, valuation uplift at sale, and void during refurbishment — discounted to today.
Not financial advice. This calculator is for informational use. Outputs depend entirely on the assumptions you enter. It is not financial, tax, legal, mortgage, or investment advice. Consult a qualified, licensed adviser in your jurisdiction before any property, financing, or tax decision.
Inputs
Results
Project NPV
−€4,839
Payback (simple)
14.3 yrs
Annual yield on cost
7.7%
Annual rent uplift
€2,160
Total net (hold period)
€6,480
NPV bakes in your discount rate — a positive figure means the project beats your hurdle. Payback ignores time value; useful for sanity checks but not for ranking projects.
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How to interpret your results
- Positive NPV means the project beats your hurdle rate. Negative NPV means your capital does better elsewhere.
- Payback under 5 years is generally considered strong for residential. 5–8 years is reasonable. Over 10 years, look hard.
- Annual yield on cost is the rent uplift expressed as a return on the money you spent. Compare it to your alternative uses of capital.
- Void cost during refurb is the single most-underestimated input. Two extra months of void can flip a project from positive to negative NPV.
What this doesn’t include
Tax-deductible status of the upgrade (varies by country), insurance/inspection changes, and any rebates or grants. Worth checking with your accountant for your specific situation.
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