Window energy efficiency rating schemes are based on a scale that ranges from A-G. This system is similar to the labeling system used that you may have seen on fridges, washing machines, and cookers. An ‘A’ rating indicates a good level of energy efficiency, whilst G is the lowest rating. Low-rated windows will not normally satisfy building regulations requirements. We’re confident that all of our windows, regardless of material or style, meet or surpass the recommended energy efficiency level. Find out more here.