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Renovation cost calculator

Build a renovation budget from your own quoted price per m² — or per ft²: the surface and the price follow the same choice — with contingency, professional fees and VAT.

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Enter Surface (m²), Your quoted price (/m²), Contingency (%), Professional fees (%), VAT (%) and the Renovation cost calculator works out Works, Total excl. VAT, Total budget incl. VAT straight away. For instance, with Surface (m²) = 70, Your quoted price (/m²) = $1,000.00, Contingency (%) = 10, Professional fees (%) = 0 and VAT (%) = 0 it returns Works = $70,000.00, Total excl. VAT = $77,000.00 and Total budget incl. VAT = $77,000.00.

How to use it

  1. Enter your values: Surface (m²), Your quoted price (/m²), Contingency (%), Professional fees (%), VAT (%).
  2. Read the result instantly: Works, Total excl. VAT, Total budget incl. VAT.

Frequently asked questions

How does the Renovation cost calculator work?

It takes Surface (m²), Your quoted price (/m²), Contingency (%), Professional fees (%) and VAT (%) and derives Works, Total excl. VAT and Total budget incl. VAT from them. The calculation is live as you type, so the result updates on every change.

Which values does the calculator ask for?

5 values: Surface (m²), Your quoted price (/m²) ($), Contingency (%), Professional fees (%) and VAT (%). Nothing else is required — no account, no file upload.

What does a typical calculation look like?

With Surface (m²) = 70, Your quoted price (/m²) = $1,000.00, Contingency (%) = 10, Professional fees (%) = 0 and VAT (%) = 0, the calculator returns Works = $70,000.00, Total excl. VAT = $77,000.00 and Total budget incl. VAT = $77,000.00. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

How much does the result change with different inputs?

It moves a lot. Using Surface (m²) = 77, Your quoted price (/m²) = $1,100.00, Contingency (%) = 20, Professional fees (%) = 5 and VAT (%) = 5 instead, Works goes from $70,000.00 to $84,700.00 — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Surface (m²) = 63, Your quoted price (/m²) = $900.00, Contingency (%) = 5, Professional fees (%) = 1 and VAT (%) = 1, Works comes out at $56,700.00. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Before making an offer: what the bank will lend, what the purchase costs on top of the price, and how much deposit closes the gap.

What is the most common mistake?

Budgeting for the price and forgetting the acquisition costs. Notary fees, transfer duty and registration add between 2% and 15% depending on the country — enough to sink an offer.

How accurate is it, and what are the limits?

Estimate only — not financial advice.

What is the difference between the Renovation cost calculator and the Down payment calculator?

This one returns Works and Total excl. VAT; the Down payment calculator returns Down payment and Loan amount. That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

FHA loan calculator is the closest one after this: Estimate the payment on an FHA-insured mortgage. It applies the minimum down payment for your credit score (3.5% at 580+, 10% at 500–579), finances the 1.75% upfront mortgage insurance premium (UFMIP), adds the monthly annual MIP, and totals principal, interest and insurance — plus optional taxes, home insurance and HOA.

Further reading

All guides →
GuideHow to Budget a Home Renovation Without a Single Made-Up NumberThere is no honest single figure for a renovation. Build it up by work type, accept that labour is the biggest and least predictable line, and hold 10 to 20 percent back for what the survey could not see.ExplainerA Construction Loan Is Not a MortgageFunds arrive in stages and interest accrues only on what has been drawn. On a $400,000 facility at 8.5 percent over twelve months, that is $18,062.50 rather than the $34,000 the headline rate implies — 53.13 percent of it.ExplainerFinancing Land Is the Hardest Money to BorrowLarger deposit, shorter term, higher rate, and a balloon at year five. On the same $120,000 plot, the land loan costs $768.10 a month against a mortgage's $606.79 — and demands $18,000 more at closing.How-toHow to Read an Amortization ScheduleUnderstand an amortization schedule row by row: how each payment splits into principal and interest, and why early payments are mostly interest.How-toHow Much Down Payment Do You Need to Buy a Home?How to work out a down payment: typical percentages, the 20% PMI threshold in the US, and how the amount you put down changes your monthly payment.ExplainerFHA Loans and the Insurance That Does Not Go AwayAn FHA loan buys a lower entry barrier with a permanent cost. Two premiums: 1.75 percent upfront, financed, which costs $8,616 in interest on a $6,755 charge; and an annual premium that at the minimum down payment runs for the whole term. The break-even against a conventional loan is not a date — it is a PMI rate, and it is 1.26 percent.