The standard height for the top of a washbasin to the floor is 80 cm (31.5 inches) for several reasons: Ergonomics, Accessibility and Plumbing.

Ergonomics: This height is generally considered comfortable for most adults, allowing for easy access and minimising strain on the back and shoulders while washing hands or face.

Accessibility: It provides a suitable height for people of average height to use the washbasin comfortably.

Plumbing Considerations: This height allows for proper drainage and connection of plumbing fixtures.

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