We have updated the definitions of these meanings to make it clear that other structures which form part of the perimeter of the premises should be included when assessing the structure.
Cafodd y diffiniadau o’r ystyron hyn eu diweddaru er mwyn ei gwneud hi’n glir y dylid cynnwys strwythurau eraill sy’n rhan o berimedr y fangre wrth asesu’r strwythur.