4.10 Purpose groups and floor heights are based on common building types, following the minimum standards as set out in the Approved Documents.
4.10 Mae grwpiau pwrpas ac uchder lloriau yn seiliedig ar fathau cyffredin o adeiladau, gan ddilyn y safonau gofynnol fel y’u nodir yn y Dogfennau Cymeradwy.