Mae cyngor Abertawe wedi dweud y byddai’n costio tua £65,000 fesul eiddo i gyrraedd y safon yma, sy’n creu cyfanswm anferth o gannoedd o filiynau o bunnoedd, a hynny i un cyngor yn unig.
Swansea council has said that it would cost about £65,000 per property to reach that standard, which creates a huge sum of hundreds of millions of pounds, and that for just one council alone.
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