It is sometimes difficult for building control officers and NHBC to identify the intended final tenure of the property (the basis for the tenure information).
Mae'n anodd weithiau i swyddogion rheoli adeiladu a’r NHBC sy'n cofnodi'r data i nodi daliadaeth derfynol arfaethedig yr eiddo (sy’n sail ar gyfer y wybodaeth am ddeiliadaeth).