Yn ogystal, mae cynllun peilot o oddeutu 300 o gartrefi wedi'i ddatblygu ar lefel Cod 4 a 5 y Cod Cartrefi Cynaliadwy, sef safon achredu ar gyfer cynaliadwyedd. Gellir defnyddio'r adborth gwerthfawr sydd wedi deillio o'r cyfnodau peilot i ddatblygu polisi yn y maes hwn.
In addition, a pilot of nearly 300 homes has been developed at Code 4 and 5 levels of the Code for Sustainable Homes, an accreditation standard for sustainability. The valuable feedback gained from the pilots can be used to develop policy in this area.