Garage Cost Calculator

Estimate the cost to build a detached garage anywhere in Canada. Enter your dimensions, pick a foundation, roof, and finish level. Prices are editable Canadian averages — adjust them to match local quotes.

Garage Details

Length (ft)

Width (ft)

Foundation Type

Frost wall is required by some municipalities; check local code.

Roof Style

Finish Level

Adjust unit prices (Canadian averages, CAD)

Basic shell ($/sq ft)

Insulated + wired ($/sq ft)

Finished + heated ($/sq ft)

Frost wall premium ($/sq ft)

Pier foundation credit ($/sq ft)

Permit & design allowance ($)

Base $/sq ft assumes slab-on-grade, gable roof, contractor-built. Hip roofs add ~7%; mono-slope saves ~4%.

Estimated build cost

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Cost Breakdown (midpoint)

Item	Amount

Want a more precise breakdown? This is the whole-building ballpark — for component-level estimates, drill into the specialized tools:
Foundation Estimator (slab, frost wall, piers — concrete & granular quantities) · Wall Framing Calculator (full lumber takeoff) · Roof Cost Estimator (trusses, style, and roofing material) · Attic Space Calculator (the room your roof creates)

Disclaimer: This calculator provides planning-level estimates based on editable average prices. Actual costs vary by region, site conditions, material prices, and contractor availability. It is not a quote and not professional advice. Confirm requirements with your municipality and obtain quotes from local contractors before budgeting.

How this estimate works

We multiply your garage's floor area by a base cost per square foot for the finish level you chose (default: $65 shell, $95 insulated, $135 finished — 2026 Canadian averages). Foundation and roof choices adjust the total: frost walls add cost for excavation and formed concrete walls below frost depth, while pier foundations save on concrete. A permit and design allowance is added, and the result is shown as a ±15% range to reflect typical quote spread.