Prince William’s bet on bricks: the Duchy of Cornwall and Britain’s stalled housebuilding

The Isles of Scilly are the sort of place that appears to have been designed to repel the modern British policy debate. A scatter of islands 28 miles off Cornwall, with a year round population that barely fills a village, it sells itself as a refuge from the mainland’s anxieties: rare wildlife, clean horizons and a stubborn sense of being apart. Yet the archipelago has drifted to the centre of one of the country’s most bruising arguments, not because ministers have suddenly discovered a taste for granite and salt air, but because the islands have become an extreme example of what the housing crisis looks like when the numbers turn from alarming to absurd.

In the decade between 2012 and 2022, the supply of homes on the Isles of Scilly shrank every year. Not merely stagnated, but went backwards, as demolition outpaced construction. Last year just seven new homes were built, a 14 year high locally and, at the same time, the lowest total recorded by any local authority in Britain. The contradiction tells its own story. When success is defined by a number that would not trouble a modest rural development on the mainland, the system has failed long before it reaches Whitehall’s targets.

The human consequences are not abstract. With only 2,366 people living on the islands, mostly on St Mary’s, the market is small enough for minor shifts to behave like shocks. Essential workers cannot move to take up posts because there is nowhere for them to live. In summer, when tourism swells demand and prices climb further from local wages, teachers and healthcare staff have resorted to tents. That detail is not a rhetorical flourish. It is a measure of how far housing has slipped from being a backdrop of daily life to the defining constraint upon it, determining who can work, who can stay and what sort of community can survive.

Against this backdrop, the Prince of Wales has found himself pitched into the thick of the national housebuilding argument, not through speeches or patronage, but through land and capital. The Duchy of Cornwall, the estate created in 1337 to provide an income for the heir to the throne and now owned by Prince William, announced in May that it would invest £500m in housebuilding alongside climate and nature protection across five “heartlands”: Cornwall, Dartmoor, Bath, Kennington in south London and the Isles of Scilly. On Scilly, the Duchy owns 75 per cent of the land. In a country where private landownership is often diffuse and contested, that is not simply influence but leverage.

The Duchy’s plan is substantial in ambition and modest by national scale, which is part of its political usefulness. It expects to spend £161m on building between 10,000 and 12,000 homes by 2040 across those areas. In the language of government, that is a rounding error. Labour has pledged 1.5 million homes in England by 2029, a figure designed to signal urgency and a willingness to bully the planning system into submission. Yet starts have fallen sharply, down 17 per cent in 2024-25 to a 12 year low of 113,000, roughly a third of the annual 300,000 target that has haunted successive administrations. Planning consents have dropped to levels last seen during the early 2010s, when the country was still nursing the wounds of the financial crisis.

What makes the Duchy’s intervention interesting is not the raw number of homes but the implied admission that Britain’s housebuilding machine is seizing up, and that the solution may increasingly depend on actors who can afford to think in decades rather than quarters. The Duchy is not a speculative developer trying to satisfy shareholders on a short timetable. It is an institution whose purpose is, in effect, to steward a long term income stream and, in the process, a reputation. That changes the arithmetic of what it can plausibly build.

Will Bax, the Duchy’s chief executive, put the diagnosis bluntly: within his career, he said, it has never been harder to build. He locates the main problem not in planning committees or local opposition, but in the economic environment that determines whether a development stacks up financially before a spade goes into the ground. Adjusted for inflation, house prices have been falling steadily for four years, since mortgage rates jumped during the 2022 cost of living crisis. Developers do not sell in nominal terms, but they do pay costs that have surged in nominal terms, from labour to materials to borrowing. When sale prices soften in real terms and costs remain elevated, the “viability” calculations that underpin most private development become punishingly tight.

High borrowing costs and squeezed affordability have thinned the pool of buyers. Meanwhile construction costs have climbed steadily since the pandemic, the energy crisis and, more recently, the war in Iran, each of which has strained supply chains and introduced new shocks into global commodity markets. Bax describes an equation that narrows viability before policy is even considered. That framing is revealing because it suggests that the country’s planning battles, fierce as they are, may be secondary to a deeper problem: Britain has built a housing system that relies heavily on private developers to deliver public goods, and then has allowed the economic conditions that keep private development profitable to deteriorate.

Policy, in Bax’s view, has made a bad situation worse. Recent years have brought new regulations and taxes, including requirements that developments improve biodiversity and do not increase soil pollution. The intent is defensible, even overdue, but intent does not pay for drainage or bricks. Each additional obligation adds cost and complexity to a project that is already squeezed. Then there is the long standing mechanism by which builders are required to fund infrastructure through so called Section 106 contributions. In principle, this forces development to carry some of the costs it creates: schools, doctors’ surgeries and other amenities needed by new residents. In practice, it can resemble a form of privatised municipal finance, with private firms expected to shoulder an increasingly heavy load at precisely the moment Bax says there is least room to carry it.

The argument is familiar, and controversial. Critics of the industry note that developers have often done handsomely in Britain, sitting on land banks and dribbling out supply to protect prices. They argue that if the public wants homes, it must confront not only planning but the market power of large builders. Yet the Duchy’s experience on Scilly complicates the easy morality play. On the islands, the obstacles are not primarily about land value or local politics, but physical reality.

Building there is typically three times as expensive as building on the mainland, according to Spencer Quick of the Penzance firm SJ Quick & Sons. Materials must be shipped from Cornwall. Workers have to commute by helicopter and be housed on the islands. Weather can interrupt deliveries. Storage space is limited. There is no cheap way to make distance disappear. The firm is building 10 bungalows on St Mary’s for the Duchy and will later start another 20, at a combined cost of £11m. Even with the Duchy providing accommodation and storage for materials, Quick says costs on this project are “only” double the mainland norm. The word “only” sits oddly, but it captures the industrial logic: on Scilly, a good outcome is paying twice what you would elsewhere.

The logistics read like an account of wartime improvisation. To begin work, Quick had to charter a landing craft to ship heavy machinery: excavators, dumpers, concrete mixers and containers for fuel tanks. It landed at Porthmellon Beach last September, after which the machines were driven up the sand and onto the site. Supplies arrive on the ship that brings food to the islands three times a week, weather permitting. The team works 84 hour weeks and returns home only every 12 days. The men must be paid extra to be away from their families. This is construction not as a routine commercial operation but as an expedition, with all the cost that implies.

Prince William visited the site in late May, meeting builders and apprentices and positioning the project within his long standing interest in homelessness. The homes are expected to be let at affordable rents to essential workers, a choice that makes the social purpose explicit and the financial return uncertain. Bax is candid about it. When construction costs are double those in Cornwall, he says, the return on investment is very low. On a standalone basis, building these homes is not financially viable. The Duchy’s justification is long term: supporting the islands’ future and enabling the community to function. The phrase that lingers is his description of Scilly as having a “housing crisis on steroids”. It is a vivid line, and perhaps a warning. If Britain’s housing system can produce such acute scarcity in a place with so much land in single ownership, what hope is there for the fragmented urban markets of the mainland?

Anthea Harries, the Duchy’s executive director of property, speaks of “social capital”, the notion that an investment can be justified by benefits that do not appear in rental yields or balance sheets. Again, there is nothing inherently radical about this. Councils once built housing on precisely that basis, treating homes as essential infrastructure. What is striking is that a royal estate is now making the argument publicly, in a country that has spent decades insisting that market mechanisms are the proper way to distribute shelter. The Duchy is not proposing to replace the market, but it is acknowledging, through action, that the market is failing a basic test on Scilly: it cannot house the workers the local economy requires.

In that sense, William’s housing push is less a “plan” than an illustration of what it takes to build when the traditional incentives break down. The Duchy can accept low returns because it does not face the same pressures as a listed developer. It can hold land and build slowly. It can balance reputational gain against financial loss. It can frame a project as stewardship rather than speculation. Ministers can celebrate such efforts while avoiding the more uncomfortable question: why is the country increasingly dependent on unusual benefactors to deliver what should be ordinary outcomes?

The Isles of Scilly make the national crisis easier to see because the scale is so compressed. When housing supply falls in a city, the pain can be distributed across neighbourhoods and hidden behind statistics. On Scilly it becomes immediate: staff sleeping in tents, vacancies unfilled, services strained. Yet the underlying mechanics are recognisable everywhere. Costs rise, borrowing becomes expensive, planning obligations expand, and the burden of infrastructure is pushed onto those trying to build. The result is what Bax calls paralysis, a slowing of delivery that is visible in national start figures and in the growing gap between political promises and physical reality.

There is, of course, a temptation to turn this into a story about royal virtue: the heir to the throne leaning into public service, applying the resources of an ancient estate to a modern social emergency. But the more revealing interpretation is institutional. The Duchy’s intervention highlights the limits of Britain’s current settlement. The country expects private actors to do much of the building and to fund much of the supporting infrastructure. It also expects those actors to deliver affordable housing through planning obligations. That model can function when prices rise, credit is cheap and costs are stable. When those conditions vanish, so does the capacity to build at scale.

Labour’s pledge of 1.5 million homes by 2029 was always going to depend on more than rhetorical force. It requires a pipeline of projects that remain viable through economic swings, and a planning and infrastructure system that does not treat every development as an opportunity to load on the costs of everything else the state cannot afford. It requires, too, a serious conversation about who bears risk. On Scilly, the risk is concentrated in the simple fact of remoteness. On the mainland, the risk is financial and political: price falls, interest rates, regulatory obligations, local opposition. A state that wants homes built quickly must decide whether it will absorb more of that risk, through direct building, cheaper finance, infrastructure spending, or reforms that change how obligations are funded.

Prince William’s housing project does not resolve these questions, but it does perform a useful service by stripping away comforting myths. If building on Scilly can be made to happen only through an actor willing to accept that it may never make money, then the conversation about “viability” elsewhere becomes harder to dismiss as mere industry lobbying. At the same time, it exposes the moral hazard of relying on such actors. Charity, even when institutional and well funded, is not policy. A patchwork of enlightened landlords cannot substitute for a system that routinely produces homes people can afford in places where they are needed.

William has spoken about homelessness for years, and Bax’s observation that homelessness is one end of a spectrum is an important corrective. A housing ecosystem that fails at the middle will always generate misery at the edges. If young workers cannot rent, families cannot buy, and older residents cannot downsize, pressure builds throughout the system until the most vulnerable fall out of it entirely. The Duchy’s focus on affordable rents for essential workers is therefore not a narrow intervention but a recognition that functioning communities depend on more than market rate luxury flats. Teachers, nurses and carers are not decorative extras. Without them, the islands become a postcard with no one left to run the school or staff the clinic.

In the end, the most unsettling line in the story may be the suggestion that a benefactor such as the Prince could become the only way homes are built. Britain is not short of land, nor of capital, nor of builders with the skills to do the work. What it appears to be short of is a model that makes ordinary construction feasible under ordinary economic conditions while still meeting the standards society now rightly demands on nature, pollution and infrastructure. The Duchy can, for now, paper over the gap on Scilly. The mainland, with its scale and its politics, will not be rescued by royal stewardship. It will require choices that governments have postponed for too long, and an acceptance that homes are not merely assets but the physical foundation of a working state.