The Guardian Environment • 8/15/2026 – 8/16/2026

King Charles and Prince William may face a substantial financial burden of up to £10 million to upgrade hundreds of rental properties on their private estates to comply with new energy-efficiency regulations. The UK government has announced that by 2030, all rental properties must achieve an Energy Performance Certificate (EPC) rating of C or higher, an increase from the current requirement of an E. This change is expected to impact nine in ten rental properties within the duchies of Cornwall and Lancaster, as well as those on the Sandringham estate. An investigation by the Guardian has revealed that more than 100 homes on the royal estates of King Charles and Prince William do not meet the existing legal minimum energy standards for landlords. Specifically, the analysis found that one in five of these homes has EPC ratings classified as F or G, which are considered inadequate under the new regulations. This situation highlights the challenges associated with maintaining energy efficiency in older properties, many of which are poorly insulated and difficult to heat. The planned upgrades are part of a broader initiative aimed at improving energy efficiency across the rental sector in the UK. The financial implications for the royal estates could be significant, as the necessary renovations to achieve the required EPC ratings will likely involve extensive work and investment. The royal family’s estates, which include properties in the duchies of Cornwall and Lancaster, as well as Sandringham, will need to adapt to these new standards to avoid potential penalties and ensure compliance with the law.
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