Under new regulations that came into force on 1 September 2017, a heritage impact statement is required to support listed building and conservation area consent applications.
O dan reoliadau newydd a ddaeth i rym ar 1 Medi 2017, mae'n ofynnol cael datganiad o'r effaith ar dreftadaeth i ategu ceisiadau am ganiatâd adeilad rhestredig ac am ganiatâd ardaloedd cadwraeth.