The appraisal principle that states that the value of any component of a property is what it gives to the value of the whole, or what its absence detracts from the whole, is called:

Contribution

Explanation:

Contribution is defined as the value that is related with the property or real estate and is called contributory value.It is the amount that gets added in any overall property due to renovation of that property's part.

This value states about the benefit or gain that is taking pace due to renovation activity.The contribution that is made through gain by the features and attributes that act as added component to the complete property.

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answer; nearly half;