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Drainage Requirements

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When a new home is constructed, it is essential that the lot be graded properly to ensure that surface drainage is directed away from the building and so that it does not cause problems or damage to neighbouring properties. It is also important that the house is elevated so that the top of the foundation wall is at least 6 inches above the adjacent ground level, to avoid water entering any masonry weep-holes and to prevent rotting at the bottom plate of the framing.

Improper lot grading can result in poor surface drainage, ponding, flooding, foundation settlement or damage, basement dampness and other similar undesirable effects, and is one of the major factors resulting in customer complaints, callbacks, warranty repairs and legal proceedings following completion and occupancy of a dwelling.

For more information, see the Homeowner's Guide to Lot Grading and Drainage for Infill Lots (PDF).

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