Do the materials used in the building services count a permanently installed materials when calculating the costs? I am working on a project where services make up a large proportion of the cost plan, and including them in the total value of permanently installed building products would make it very difficult to meet the 15% threshold for NC-v4.1 MRc3: Sourcing of Raw Materials.

Could it be argued that since they are replaced more often than other buiding elements they don´t count as permanent?