Riddell v Porteous [1999] 1 NZLR 1 is a cited case in New Zealand regarding liability in tort for defective products.

After the house was completed, it was discovered that Riddell had departed from the approved plans as far as the deck was concerned, resulting in rainwater seeping into their house.

This departure from the plans escaped the councils building inspector.

Porteous subsequently sued Riddell, the Dunedin City Council, and the Bagleys as well, and was originally awarded $21,200 in damages by the District Court.

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