Rydym hefyd wedi datblygu cynllun gwarant morgais sef NewBuy Cymru.  Mae'r cynllun hwn, fodd bynnag, yn dibynnu ar berthynas driphlyg rhwng y Llywodraeth, adeiladwyr a benthycwyr ac rydym wrthi'n ceisio sicrhau bod pawb ynghlwm wrth gynllun hyfyw. Golyga'r ffaith bod angen i Lywodraeth y DU gytuno'n derfynol ar ddiwyg ei chynllun Gwarant Morgais: Cymorth i Brynu nad yw benthycwyr yn gallu ymrwymo i NewBuy Cymru ar hyn o bryd.
In addition, we have developed a NewBuy Cymru mortgage guarantee scheme. However this relies on a tri-partite relationship between Government, builders and lenders and we are seeking to secure the engagement of all parties in a viable scheme. The need for the UK Government to finalise the design of their Help to Buy: Mortgage Guarantee scheme have meant that lenders are unable, at this time to commit to NewBuy Cymru.