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Renovation cost calculator

Build a first budget for a renovation from the floor area, a cost per area, the finish level, a contingency and tax.

Units
ft²
$/ft²
%
%

Fields marked “example” are pre-filled with example assumptions, not verified current prices. Replace them with your own figures.

Your estimate

Estimated total

$37,260

Lower end
$29,808
Upper end
$46,575
Works before extras
$32,400
Contingency
$4,860
VAT / tax
$0

Estimates for planning only — not a quote, survey or financial advice.

How this is calculated

Formula

  1. Works = floor area × cost per area × finish factor (basic 0.85, standard 1.0, premium 1.35)
  2. Contingency = works × contingency %
  3. Tax = (works + contingency) × tax rate
  4. Range = total × 0.8 to total × 1.25

Assumptions

  • The cost per area is an example figure, not a current market price. Replace it with quotes from local contractors.
  • Standard VAT rates are pre-filled (UK 20%, France 20%, Germany 19%, Spain 21%, Italy 22%); reduced rates can apply to some renovation and energy-saving work. In the US, sales tax depends on the state and is often included in contractor prices.
  • Permits, design fees, structural work, hazardous-material removal and furniture are not included.