Increasing recycled content does not inevitably translate to an increase in project cost. There is no need to use unfamiliar or high cost materials. Many of the products with higher levels of recycled content are already mainstream, high-volume products that are cost competitive with, and subject to the same testing arrangements as, equivalent products containing less recycled material.
The Waste and Resources Action Programme (WRAP) maintains a database of the recycled content of commonly used construction products.