Mae sicrhau gostyngiadau sylweddol a chost effeithiol yn allyriadau carbon adeiladau yn rhan hanfodol o ymdrech Llywodraeth Cymru i leihau nwyon tŷ gwydr.  Llynedd, y sector preswyl oedd yn gyfrifol am ryw chwarter o’r holl allyriannau, felly bydd gweithredu i leihau allyriannau o adeiladau hen a newydd yn hanfodol wrth newid i economi carbon isel.  Gallai mwy o adeiladau rhad-ar-ynni olygu hefyd biliau ynni is i drigolion.
Substantial and cost-effective reductions in carbon emissions from buildings are an essential part of the Welsh Government’s effort to reduce greenhouse gas emissions. Last year, the residential sector accounted for about a quarter of emissions, so action to tackle emissions from both new and existing buildings will be critical to the transition to a low-carbon economy. More energy efficient homes may also mean lower energy bills for consumers.