Adeiladwyd rhai o'r adeiladau hyn yn ystod y 10 neu 15 mlynedd diwethaf. Yn hytrach na chael eu hachosi gan waith cynnal a chynnal gwael neu esgeulustod, mae'n ymddangos bod y namau hyn, o bosibl, yn deillio o grefftwaith gwael, goruchwyliaeth amhriodol ac, mae'n ymddangos ar adegau, ddiffyg parch at reoliadau adeiladu.
Some of these buildings were built in the past 10 to 15 years. These faults appear not to be caused by poor maintenance or neglect, but potentially as a result of poor workmanship, improper oversight and at times it seems, a disregard for building regulations.