NEC ECS: Applying Fee to change in materials specification

Dear team,

Under ECC Option A (and prior to any procurement or installation being undertaken), does a change in material specification in materials provided by a subcontractor attract subcontracted fee percentage in the pricing of the CE?

Yes, the subcontract fee should be applied to the change in Defined Cost to assess the CE if you are using NEC3. Under NEC4 there is only one fee, which should be used.