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In 2026, the cost to install or replace a French drain in Canada generally ranges from $100 to $250 per linear foot, depending on the complexity of the project. For a standard single-family home with a foundation perimeter of about 100 feet, the base cost can therefore range from $10,000 to $25,000. However, in a real-world project, homeowners should often plan for a total budget of approximately $15,000 to $35,000, especially when additional work is required, such as foundation crack repair, window well installation, sump pump installation, full foundation waterproofing or landscaping restoration.

Needless to say, the long-term durability of a house depends heavily on the lack of seepage, above all in the foundation. Excessive humidity can have devastating and damaging long-term effects, both on your home and your health. Moreover, mould and bacteria growth can end up being very costly.

A French drain works with gravity. Water follows the ebb and flow of the earth's guiding principle, and thus, the drain carries water downstream. This sloped trench provides a method to help homeowners avoid damp patches on their lawn or property by regulating drainage, and keeping things dry in places where it's necessary.