King Charles oversees and profits from the Duchy of Lancaster, while Prince William oversees and profits from the Duchy of Cornwall. These duchies are the two biggest land-holders in the UK, and they are inherited by the sovereign and the heir automatically. Both Charles and William have made a big deal about how they’ve brought these feudal remnants into the 21st century. They have not. They are slumlords who trap people in cold, moldy, unrenovated rentals under bonkers lease terms. They are also drawing profits from price-gouging charities and hospitals for commercial space. To make matters worse, William is seemingly selling off chunks of the Duchy of Cornwall and no one knows if he’s pocketing the profits because there’s little oversight. Well, back to the slumlord thing – according to a new investigation, the two duchies’ residential rentals are environmental disasters. Both Charles and William refuse to update and upgrade the rentals too.
King Charles and Prince William could be facing a potential bill of up to £10million to bring hundreds of rental homes on their private estates up to the Government’s upcoming energy-efficiency standards. Laboue has announced rental properties now require an Energy Performance Certificate (EPC) of C or higher by 2030 – up from the current minimum of E.
An investigation by The Guardian has revealed nearly nine out of 10 domestic properties across the Duchy of Cornwall, the Duchy of Lancaster, and the Sandringham estate hold energy performance certificate ratings of D or below, meaning they will, by law, require upgrades. Upgrade costs are estimated at as much as £10,000 per property, with fines of £30,000 for each non-compliant home still being let.
Energy performance certificates were introduced in 2007 as carbon emissions became an increasing public concern. They grade properties from A, the most efficient, down to G, the worst performers, offering an estimate of running costs and environmental impact. A Government spokesman said: “Everyone deserves to live in a warm, comfortable home. Our plans for private rental homes to be EPC C by 2030 could lift up to half a million households out of fuel poverty by 2030, cutting bills to give families across the country the breathing space they need.”
Across the country, slightly more than half of all privately rented homes currently fall below the C standard. The royal estates, however, perform notably worse than the national average. The Sandringham estate in Norfolk fares worst of all. Of more than 150 EPCs examined by the newspaper, 99 per cent carried ratings between D and G, with not a single property achieving an A or B, while just one managed a C. Three-quarters of the homes analysed sat at E – the bare minimum currently permitted for rental properties and two levels below the new requirements.
As for the Duchy of Lancaster, spanning roughly 18,000 hectares from north-west England to London, more than 90 per cent of its 200-plus assessed properties missed the C threshold, with nearly half rated E and more than a quarter at D. Upgrading those homes, it is said, could cost upwards of £2million.
Prince William’s Duchy of Cornwall, covering some 55,000 hectares predominantly in the south-west, performed marginally better at around 80 per cent below C. Its improvement bill alone could reach £5million.
With the King’s Foundation and William’s Earthshot Prize, both the monarch and his eldest son have built reputations as champions of environmental causes, so the disappointing energy performance of properties on their private estates may be surprising.
Jonathan Bean, a spokesman for the campaign group Fuel Poverty Action, said: “The royal duchies should be leading the way in upgrading all their properties to a minimum EPC of C by 2030 to protect people’s health and the environment. Instead, they are dragging their feet and looking for loopholes. If even the richest landlords are allowed to get away with it, what hope is there of getting the rest to do the right thing?” He urged ministers to “close all loopholes and increase enforcement efforts”.
The Duchy of Cornwall’s profits – as in, William’s “income” – are reportedly around $30-45 million annually. The Duchy of Lancaster is pretty secretive, but it’s widely believed that it’s easily worth $500 million or more. My point? Both duchies could easily reinvest their profits into modernizing their rentals and bringing everything up to environmental code, not to mention updating those rentals so that Charles and William are not the two biggest slumlords in the UK. The money is there – £10 million across two duchies, to bring hundreds of rentals up to code is not some huge amount for them. They just refuse to do it on principle. They’re like… NO, we’re slumlords, deal with it!
Photos courtesy of Avalon Red, Cover Images.
- King Charles III delivers a speech during the service of the Order of St Michael and St George at St Paul’s Cathedral, London. Picture date: Thursday May 7, 2026. Featuring: King Charles III Where: London, United Kingdom When: 07 May 2026 Credit: PA Images/INSTARimages **NORTH AMERICA RIGHTS ONLY**
- The Prince of Wales, known as the Duke of Cornwall when in Cornwall, during a visit to Fistrall Beach in Newquay, to meet local organisations who are working to promote safety in the sea and across the beach area Featuring: William, Prince of Wales Where: Newquay, United Kingdom When: 09 May 2024 Credit: PA Images/INSTARimages **NORTH AMERICA RIGHTS ONLY**
- Official handover in which King Charles III passes the role of Colonel-in-Chief of the Army air corps to Prince William, Prince of Wales at the Army Aviation Centre in Stockbridge, Hampshire Featuring: King Charles III, Prince William, Prince of Wales Where: Stockbridge, Hampshire, United Kingdom When: 13 May 2024 Credit: Cover Images
- The Prince of Wales being shown worm composting during a visit to Lower Blakemere Farm, a Duchy Focus Farm in Hereford, to learn more about how the multigenerational farm has refined regenerative farming practices and farm diversification as part of its journey to net zero. The 630-acre farm was established in the early 1980s as a specialist seed grower with a herd of South Devon cattle Featuring: William, Prince of Wales Where: Hereford, United Kingdom When: 28 Jan 2025 Credit: PA Images/INSTARimages **NORTH AMERICA RIGHTS ONLY**
- The Prince of Wales, Patron of NHS Charities Together, talks to NHS staff members during to a visit to the Royal Berkshire Hospital in Reading, to see the impact of funds provided by the charity since the coronavirus pandemic which began five years ago. Featuring: Prince William, Prince of Wales Where: Reading, United Kingdom When: 05 Mar 2025 Credit: PA Images/INSTARimages **NORTH AMERICA RIGHTS ONLY**
- Trooping the Colour 2025 ceremony, marking the monarch’s official birthday Featuring: King Charles III, Prince William, Prince Louis and Prince George Where: London, United Kingdom When: 14 Jun 2025 Credit: PA Images/INSTARimages **NORTH AMERICA RIGHTS ONLY**
- Prince William, Prince of Wales during a visit to Ilha de Paqueta, on day two of his trip to Brazil for the annual Earthshot Prize Award Featuring: Prince William, Prince of Wales Where: Ilha de Paqueta, Brazil When: 04 Nov 2025 Credit: PA Images/INSTARimages **NORTH AMERICA RIGHTS ONLY**
- The Prince of Wales, patron of We Are Farming Minds, during a visit to a family farm in Herefordshire to highlight the importance of mental health support across the farming community. Where: United Kingdom When: 15 Jan 2026 Credit: Richard Pohle/The Times/PA Images/INSTARimages **NORTH AMERICA RIGHTS ONLY**
- King Charles III smells wheaten bread at The Pantry Foodbank in Donard Methodist Church, Newcastle, on day two of the royal visit to Northern Ireland. The initiative provides free food parcels and hot meals, offering vital support to families and isolated individuals Featuring: King Charles III Where: Belfast, United Kingdom When: 20 May 2026 Credit: PA Images/INSTARimages **NORTH AMERICA RIGHTS ONLY**
- King Charles III and Queen Camilla plant a Malus Royalty tree during a Royal Garden Party at Hillsborough Castle, on day two of the royal visit to Northern Ireland Featuring: King Charles III, Queen Camilla Where: Hillsborough, United Kingdom When: 20 May 2026 Credit: Chris Jackson/PA Images/INSTARimages **NORTH AMERICA RIGHTS ONLY**
- King Charles III plays a ukulele while meeting members of the Loughries Men’s Shed Ukulele Ensemble at Ards Allotments, near Strangford Lough in Newtownards, on day three of the royal visit to Northern Ireland. Ards Allotments was founded by owner Maurice who was inspired by watching the King, then Prince of Wales, visit an allotment on the news Featuring: King Charles III Where: Newtownards, United Kingdom When: 21 May 2026 Credit: PA Images/INSTARimages **NORTH AMERICA RIGHTS ONLY**
- Royals attend Ladies Day on day three of Royal Ascot 2026 at Ascot Racecourse Featuring: King Charles III and Queen Camilla Where: Ascot, United Kingdom When: 18 Jun 2026 Credit: Cover Images **NOT AVAILABLE FOR HELLO MAGAZINE**

























The greed and selfishness, along with the narcissism, is so beyond the pale. And they’re talking about only the monies that are KNOWN! We all know there are multiple off-shore accts holding (probably) just as much (or close to it). WTH are these people (all multi-million/billionaires, and Elmo) going to do with all this money?? Even if it’s in real estate and not all liquid, there is no way they will go through it in a dozen lifetimes, and that includes all of their heirs. Money like this just grows exponentially.
Willam was selling off property because there was no upkeep. He wanted to avoid paying out. Wonder if he gets a tax break
I read the coverage in The Guardian over the weekend and hoped you would talk about it. It’s interesting to see GB News covering it.
And yes, the money is more than there but the royals are famously cheap and dngaf about the peasants.
I thought William wanted to do things differently than Charles. I guess, on this, not.
This is so stupid. It would be such a win if they offered up Duchy properties to be experimental cutting edge green homes. How much good it would do, how much good publicity.
It’s the sort of thing young Charles would have done. Hard to imagine now that he founded The Prince’s Trust. When did that all end?
They don’t need anything cutting edge to bring the properties to an A rating. The technology and materials already exists. They are just greedy.
I hope the Guardian stays on this story until those properties are made legal.
I would not hold my breath waiting for the Guardian to consistently do the right thing. The Guardian has been too busy gleefully participating in wingnut racist smear campaigns to do anything socially conscious and worthwhile long-term. Billionaires are billionaires because they hoard wealth and do not re-invest the money for the greater good. This story is horrifying, but typical of the uber rich.