Reuse is the action that allows discarded goods or products to be reused, called waste (e.g. municipal solid waste), and give them the same or different use than that for which they were designed.

This process means that the more objects we reuse, the less garbage we will produce and the fewer resources we will have to spend. Reuse occupies second place in the waste hierarchy, after prevention and above recycling.

In Spain, the production and management of waste from all types of works is regulated: building, urbanization, demolition, renovation "Renovation (construction)"), etc.

Its objective is to promote, in this order, their prevention, reuse, recycling and other forms of recovery, ensuring that those destined for disposal operations receive adequate treatment, and contribute to the sustainable development of this activity. For these purposes, the drafting of a Construction-Demolition Waste Management Plan (RCD) "Construction-Demolition Waste Management Plan (RCD)" is mandatory.[1]​.