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A house extension in Canada costs $250 to $450 per square foot in 2026, putting most full additions between $100,000 and $300,000. A bump-out starts near $30,000, while a second-storey addition in Toronto or Vancouver regularly passes $500,000.

Expanding a kitchen is a popular home renovation project in Quebec and across Canada. Modern kitchens are no longer solely used for meal prepping; they have become central gathering spaces, often featuring large islands, walk-in pantries, and plenty of natural light. However, when expanding the home's footprint, an important technical question comes up: should you excavate and build a poured concrete foundation, or choose an insulated slab-on-grade?

Expanding your home can be an exciting project; however, the prospect of excavating your property, damaging your landscaping, and pouring new concrete foundations below the frost line can discourage many homeowners. In Quebec, for example, foundations are commonly installed approximately 1.2 m to 1.5 m below grade. For owners of bungalows, single-storey homes, or two-storey houses looking to add a bathroom, make a kitchen bigger, or create a four-season sunroom, a cantilever home addition can be a particularly practical architectural solution.