King County Department of Assessments

Setting values, serving the community, and promoting fairness and equity.

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Glossary of terms for residential parcels

IMPROVEMENT
	Anything done to raw land with the intention of increasing its value. A structure erected on the property constitutes one very common type of improvement, although other actions, such as those taken to improve drainage, are also improvements.
IMPROVEMENTS
	Buildings, other structures, and attachments or annexations to land that are intended to remain so attached or annexed, such as sidewalks, trees, drives, tunnels, drains and sewers.