Silent summer: Britain’s architectural crisis

Words by Andy Love 

If we pause for a moment and look honestly at Britain’s architecture over the last twenty years, an uncomfortable question emerges:

Are we truly proud of what we have built?

In 1962, the marine biologist and writer Rachel Carson published Silent Spring, a book that changed how the public understood environmental risk. Carson warned that the widespread use of pesticides could create a future in which birds no longer sang in the springtime, a haunting metaphor for ecosystems quietly collapsing under the weight of technological optimism.

Her argument was not just about our overuse of chemicals, but about unintended consequences: the idea that innovations introduced in the name of progress can gradually undermine the very systems that sustain life. Many environmental changes do not arrive as dramatic singular events. They emerge gradually, until they become accepted as normal. One example is the so-called “windshield phenomenon”: the observation that far fewer insects now splatter against car windscreens than they once did. The change happened slowly enough that many barely noticed it happening at all.

Extreme heat risks unfolding in much the same way. Each summer edges slightly warmer than the last. Heatwaves once described as exceptional become recurring events. Excess deaths during hot weather subtly increase, particularly among older people and vulnerable groups. Yet because these changes accumulate gradually, society struggles to respond with the urgency they deserve.

There is an uncomfortable parallel today. While the threats are different, the pattern is strikingly similar. Britain’s housing system has spent decades optimising buildings for daylight metrics, energy efficiency targets and planning compliance. The result is a growing number of homes that struggle to remain comfortable during extreme heat.

If Carson warned of a “silent spring,” we may now be approaching something closer to a 'silent summer'. Across the UK, and particularly in London, we have endured an architectural crisis. Not simply a crisis of aesthetics or density, but of whether homes remain comfortable and safe to live in.

Many of the homes constructed in the past two decades are increasingly ill-suited to today’s temperatures. At the same time, much of our older housing stock sits within a regulatory framework that makes adaptation difficult. Homeowners who want to make sensible improvements to protect their homes from rising summer temperatures frequently find themselves navigating complex planning processes and highly conservative heritage decisions. The result is a housing system struggling to keep pace with the realities of a warming climate. Architecture is not separate from this story. Our homes increasingly sit at the frontline of climate exposure, shaping whether periods of extreme heat remain uncomfortable, or become dangerous.

Homes that overheat

The UK housing crisis is usually discussed in terms of availability and affordability. Yet there is another dimension that receives far less attention: the basic suitability of our homes for the climate we now inhabit.

Over the past couple of decades, housebuilding in the UK has largely ignored the increasing likelihood of severe heatwaves. When temperatures exceeded 40°C in 2022, the event exposed just how vulnerable many modern homes are to overheating. Apartments with large areas of glazing, limited shading and constrained ventilation can become extremely uncomfortable during hot weather. In some cases, indoor temperatures climb well above 30°C for extended periods, creating serious health risks for vulnerable groups including older people, young children and those with existing medical conditions. The uncomfortable truth is that we have built homes that trap heat rather than manage it.

This issue becomes even more important as the UK begins investing billions of pounds into improving the energy efficiency of its social housing stock. Programmes designed to reduce carbon emissions through insulation, airtightness and new glazing are essential if we are to meet our climate targets. Recent policy initiatives such as the Warm Homes Plan have started to recognise the importance of ensuring homes are not only energy efficient, but also resilient to future climate conditions.

However, if overheating is not addressed alongside energy performance, there remains a real risk that some retrofit programmes could unintentionally worsen summer comfort. Measures that are highly effective at retaining heat in winter can also trap heat during prolonged warm periods if shading, ventilation and solar control are not properly considered. In a country that is warming rapidly, energy efficiency and heat resilience must go hand in hand.

Shutters, shutters, shutters

The overheating of British homes is not the result of a single mistake. Rather, it reflects a series of design conventions that have gradually become normalised across the industry. One example is the near absence of external shading in British housing. In much of southern Europe, shutters are considered a fundamental architectural element. They prevent solar radiation from entering buildings and allow occupants to regulate daylight, privacy and heat throughout the day.

In Britain, however, shutters remain rare. Part of the explanation lies in planning culture. In historic neighbourhoods in particular, proposals to introduce shutters or external shading can face significant resistance from heritage authorities or planning officers concerned about visual changes to building façades. Even when homeowners wish to install simple shading measures, the planning process can become lengthy and uncertain. Faced with this complexity, many simply abandon the idea.

Window design has also played a role. The outward-opening casement windows commonly used across the UK make the installation of external shading devices significantly more difficult. Inward-opening windows, which are standard in much of continental Europe, allow external blinds or shutters to be integrated far more easily into the building envelope.

These details may appear minor, but collectively they determine whether buildings can passively control heat or whether they become dependent on mechanical cooling.

When one-track guidance shapes design

Another factor that has subtly influenced housing design is the way certain pieces of guidance have been interpreted within the planning system. The daylight recommendations developed by Paul Littlefair at the Building Research Establishment (BRE) [Site layout planning for daylight and sunlight] were originally intended to improve the quality of housing by ensuring that homes received adequate natural light. The objective was entirely reasonable: better daylight can contribute to wellbeing and comfort. However, in practice the guidance has often been treated within the development process as something closer to building regulations. Planning consultants and project teams, understandably wary of risking refusal during planning applications, have tended to design conservatively against daylight metrics.

One of the most straightforward ways of satisfying daylight targets is to increase glazing, especially in the absence of dual aspect and cross-ventilation. Over time, this approach has contributed to the widespread use of floor-to-ceiling glazing across apartment buildings. The unintended consequence is now becoming apparent: large expanses of glass allow significant solar gain during warm periods, particularly in buildings where shading has not been incorporated into the architectural design. What was originally intended to improve living conditions has, in most circumstances for flats, contributed to homes that perform poorly during hot weather.

What value is a beautiful view if you are standing in a furnace?

The age of architectural conformity

There is a wider cultural problem sitting behind Britain’s overheating homes, and it concerns the way we now design. Over time, architecture in Britain, particularly housing in London, has become increasingly shaped by compliance; meet the daylight targets, meet the fire strategy, meet the space standards, meet the energy targets, meet the planning officer’s expectations, meet the review panel’s preferences, meet the report requirements. Consent secured. The system rewards adherence to rules, but in doing so it can discourage something architecture desperately needs; imagination.

When design becomes an exercise in satisfying layered policy requirements, buildings begin to converge toward the same outcome. Ceiling heights are squeezed to fit in another storey. Floorplates are maximised. Façades are refined to avoid objection rather than inspire. Architectural features that once gave buildings character; shutters, recesses, deep reveals, generous balconies, meaningful storage, are often value-engineered away or constrained by policy. What remains is efficient, but impoverished.

London, one of the world’s great cities, increasingly risks becoming a monoculture of housing: repetitive forms, repetitive materials, repetitive compromises. The unintended consequences, homes that are too hot in summer, prone to damp in winter, short on storage and too often devoid of the generosity or identity that makes a place memorable. Future generations may look back at this period of construction and ask a difficult question: what exactly were we trying to build? A lasting civic legacy, or the maximum developable envelope permitted by policy?

Perhaps architectural historians will one day describe this as the Elizablandean period: an age of extraordinary caution, where housing became technically compliant, commercially optimised and culturally forgettable. Buildings stripped of ornament, individuality and climatic intelligence designed to satisfy rules, but too rarely designed to stir the soul. But this can change. With renewed debate around planning reform and the delivery of new towns, Britain has an opportunity to draw a line in the sand, to build homes that are distinctive, climatically responsive and generous to the people who live in them. Homes shaped not only by rules, but by wisdom. Not only by efficiency, but by beauty. Not only for planning consent, but for posterity.

Regulation and the risk of unintended outcomes

The introduction of Part O of the Building Regulations in 2022, which addresses overheating risk in new homes, represented an important acknowledgement that the problem required regulatory attention. After years in which overheating had largely been treated as a design consideration rather than a compliance issue, the regulation signalled that the industry could no longer ignore the thermal realities of a changing climate. Yet regulation alone does not guarantee good outcomes.

As Part O continues to be applied across the industry, questions are emerging about how effectively it supports passive cooling strategies in practice. Designers must demonstrate compliance using specific modelling assumptions and simplified behavioural patterns for occupants. While these assumptions provide a consistent framework for assessment, they can also make it difficult to fully capture the effectiveness of measures such as shading or occupant-controlled ventilation. To some extent, developers are operating within the constraints placed upon them. The industry can only respond to the framework it is given. After all, how can a cooling hierarchy that prioritises external shading be meaningfully applied when large parts of London sit within conservation areas, where shutters, blinds and other façade interventions may face strong resistance from planners and heritage officers?

In some cases, the very measures that would make homes more resilient to heat are those most difficult to secure permission for. There are also instances where the requirements of different regulatory frameworks intersect in complicated ways. Fire safety provisions, energy standards and daylight expectations can all influence design decisions that affect overheating risk. Navigating these overlapping constraints can sometimes lead project teams toward solutions that prioritise compliance certainty rather than climatic responsiveness. One potential consequence is a gradual drift toward mechanical cooling as a reliable method of demonstrating acceptable indoor temperatures. If that trajectory continues, Britain may find itself repeating a familiar pattern: introducing regulations intended to solve one environmental challenge while inadvertently encouraging design responses that create new ones.

The challenge of retrofitting existing homes

While new housing grapples with overheating risk, Britain’s homes face a different obstacle: the difficulty of adaptation. Much of the UK’s housing stock is historic, and protecting architectural heritage is rightly an important responsibility. However, the way heritage policy is sometimes applied can make it surprisingly difficult to introduce modest climate-adaptation measures.

External shutters, shading devices and other solar-control interventions may be resisted on visual grounds, even when they would significantly improve the liveability of homes during hot weather. As summer temperatures continue to rise, this tension between conservation and adaptation will become increasingly important to resolve. Preserving historic character should not mean preventing buildings from evolving to remain safe and comfortable in a changing climate.

Rethinking the way we design homes

Taken together, these issues reveal a deeper challenge within the British housing system. Regulatory frameworks and planning processes have evolved over time in ways that do not always align with the realities of a warming climate. The result is a housing landscape in which overheating is becoming more common and adaptation remains unnecessarily difficult. Addressing this challenge will require a shift in architectural thinking.

External shading, whether through shutters, blinds or carefully designed balconies, should become a normal feature of housing design rather than a rare exception. Buildings must be designed to control solar gain before heat enters the interior, rather than relying on occupants to manage overheating after it occurs. And planning systems need to recognise that enabling climate adaptation is now as important as preserving visual continuity.

If we are serious about building homes that remain liveable in a warming climate, heat resilience must become a central principle of British architecture. The “silent summer” is already beginning to emerge around us. Heatwaves once considered exceptional are becoming more frequent and deadly. Yet unlike floods or storms, extreme heat leaves little visible destruction behind.

Rachel Carson warned that environmental crises do not always arrive suddenly. Sometimes they unfold noiselessly until the damage is woven into everyday life.

Britain’s silent summer may be unfolding in much the same way.