Buying & selling

Building Replacement Cost Calculator

Estimate a building replacement allowance from area and local unit cost. Replace every default with figures that apply to your property and location.

What this calculator estimates

Estimate a building replacement allowance from area and local unit cost. It combines the inputs below to produce Estimated replacement cost. Every assumption remains editable so the estimate can reflect the property, financing and location being evaluated.

Worked example

Using the displayed sample assumptions, the calculator produces $759,550. This is an illustration, not a market quote. Change one input at a time to understand what drives the result.

Inputs and assumptions

• Building area — sample input: 2200 sq. ft.
• Current construction cost per area unit — sample input: 275 currency units per sq. ft.
• Demolition and debris — optional — sample input: 25000 currency units
• Design, permits and professional fees — sample input: 10 %
• Contingency — sample input: 10 %

How to interpret the result

Include immediate work and transaction costs in the decision. Compare a conservative case with an expected case and keep a record of the assumptions used.

Common mistake to avoid

Do not confuse purchase price with total cash required. Local definitions, taxes, lending practices and measurement requirements can materially change the result.

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Reviewed 2026-09-08.