Ideally, the builder or craftsperson should be able to provide evidence of his or her ability to carry out the work required, which may include possession of a Heritage Skills Card.
Yn ddelfrydol, dylai'r adeiladwr neu'r crefftwr allu rhoi tystiolaeth o'i allu i gyflawni'r gwaith sydd ei angen, a allai gynnwys meddu ar Gerdyn Sgiliau Treftadaeth.