“Improvement” includes renewal of works if:

The concept of "improvement" in property law or land management refers to work that enhances the value or utility of a property beyond mere maintenance.

• Durably increase value is the correct answer because an improvement fundamentally adds lasting worth or functionality to a property, distinguishing it from simple repairs.
• "Merely repaired" (A) describes routine maintenance, which restores an item to its previous state but doesn't necessarily increase its value.
• "Done by contractor" (C) refers to the agent performing the work, not the nature or effect of the work itself.
• "Approved by committee" (D) relates to a procedural requirement, not the intrinsic quality that defines an improvement.

Therefore, for work to be considered an improvement, it must result in a durable increase in the property's value.