Free Tool

Home Addition Cost Calculator

This home addition cost calculator returns a build-cost range and the resale value an addition adds, using real Ontario rates by region.

Current Home Value

Service Area

Renovations

Renovation 1

Projected Outcome

Current Value—

+ Value Added—

New Home Value—

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What it typically costs

Real numbers, by region

Premium-finish rates for this work run $165 CAD to $205 CAD per square foot across our service area, lowest in Listowel and Perth County, highest in Toronto and the GTA. For a typical 200 to 600 square foot project, that is roughly $33,000 CAD to $123,000 CAD.

At resale, this project type returns about 75% of its cost in added home value. The calculator above applies that rate for you.

Home addition cost per square foot Custom home builder in Perth County All calculators

From estimate to quote

The calculator is a starting point.

For the real build cost, send us the project. We reply within 24 hours with a written range and the next available site visit.

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