The Cavity Insulation Guarantee Agency, CIGA, has issued just over 300,000 guarantees in Wales.
Mae'r Asiantaeth Gwarantau Inswleiddio Waliau Dwbl, CIGA, wedi rhoi ychydig dros 300,000 o warantau yng Nghymru a bod ychydig dros 2,000 o hawliadau wedi dod i law.