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Construction Calculators

Compare contractor quotations and estimate home additions, accessory units and basement finishing from measured areas and stated project scopes.

Available construction calculators

4 calculators for this project type.

Home Construction & RemodelingHome Addition Cost CalculatorEstimate addition square footage across storeys and separate shell, interior, building systems, site and design allowances.

Home Construction & RemodelingADU Construction Cost CalculatorBudget a detached accessory dwelling unit using gross floor area, separately measured utilities and itemized construction quotations.

Home Construction & RemodelingContractor Quote Comparison CalculatorNormalize two contractor quotations for excluded items, allowances, fees and contingency before comparing total cost.

Home Construction & RemodelingBasement Finishing Cost CalculatorPlan floor and wall materials for basement finishing while keeping moisture work and contractor costs visible.

Planning construction projects

An addition joins an existing structure, whereas a detached accessory dwelling unit usually needs a separate footprint, utility connections and site work. Both models depend on independently defined building systems; zoning, engineering and permits cannot be inferred from square footage.