A house extension costs $250 to $450 per square foot in Canada. See 2026 prices by extension type and city, what's included in a quote, and zoning requirements.

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.

House Extension Cost in Canada: What to Budget in 2026

Learn the cost of foundation excavation and waterproofing in Quebec, including price per linear foot, materials, drainage, and factors that affect the total budget.

In Quebec, poured concrete and concrete block foundations are exposed to particularly harsh climate conditions. Rapid spring snowmelt, combined with clay or poorly draining soils, can create significant hydrostatic pressure at the base of basement walls. When moisture begins penetrating the structure or water starts pooling on the concrete slab, major repairs may be required.

Foundation Excavation and Waterproofing Costs in Quebec

French drain, sump pump, or waterproofing membrane? Learn how each system works, what it costs, and how they help protect foundations from water damage.

In Quebec, basement water infiltration is the most common type of residential insurance claim. According to the&nbsp;Insurance Bureau of Canada, water damage accounted for 68% of home insurance claims paid in Quebec in 2024. Harsh winters, major spring thaws, and heavy summer rainfall place considerable hydrostatic pressure on the below-grade portions of our homes.

French Drain vs. Sump Pump: Roles and Foundation Waterproofing in Quebec

Bathroom 

Kitchen 

Basement 

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Unique Quality Contractor 

Edmonton - Central

Edmonton - North

Edmonton - South

Edmonton - West

Leduc County

Parkland County

Strathcona County

Sturgeon County

Basement renovation – Without plumbing or electrical

Bathroom renovation – Without plumbing or electrical

Commercial space renovation

Concrete cutting & window opening

Full basement renovation

Full bathroom renovation

Full kitchen renovation

General renovation

Home or ground floor renovation

Interior & exterior renovation

Kitchen renovation – Without plumbing or electrical

Rental unit renovation

Roof truss & roofing

Tiling

Water infiltration – Foundation

Water infiltration – Roof or attic

Water infiltration – Window

Water inlet & excavation

Unique Quality Contractor

Unique Quality Contractor

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