Although the number of sales has fallen in recent years, sales continue to be made and, as a result, fewer homes are available for those on lower incomes to rent.
Er bod y nifer sy’n cael eu gwerthu wedi gostwng yn ddiweddar, mae cartrefi’n dal i gael eu gwerthu ac o’r herwydd, mae llai ar gael i’w rhentu i’r rheini sy’n ennill incwm bach.