On 25th February 2016, the Welsh Government created a new use class (C4) for smaller HMOs, which previously were classed as Dwelling Houses (C3).
Ar 25 Chwefror 2016, creodd Llywodraeth Cymru ddosbarth defnydd newydd (C4) ar gyfer Tai Amlfeddiannaeth llai, a oedd gynt yn Dai Preswyl (C3).