Many areas also have Article 4 Directions, which give additional controls over various minor alterations, such as alterations to windows (PDF 866 KB).
Mae gan nifer o ardaloedd Gyfarwyddyd Erthygl 4, sy’n gosod rheolaethau ychwanegol dros amrywiaeth o fân addasiadau eraill fel addasiadau i ffenestri (PDF 866 KB) .