Climate resilience in *UK housing* | The Bryden Wood podcast \\Martin Wood, Pablo Gugel and Helen Hough
The UK has one of the oldest, least efficient housing stocks in Europe. It was built for a climate that was reliably cold. That climate no longer exists. Summers in the southeast now regularly exceed 35 degrees. The same buildings that lose heat in winter overheat in summer. And the solutions: insulation, heat pumps, shading, natural ventilation, are entangled with questions of cost, culture, building regulations, and the limits of individual behaviour that no single policy lever can resolve.
The perfect storm:
In this episode of the Bryden Wood Podcast, co-founder Martin Wood is joined by Director of Sustainability Pablo Gugel and Associate Helen Hough for a wide-ranging conversation that is honest about the complexity and direct about what actually needs to change.
If you had a pound to spend
Martin opens with a deceptively simple question: if you had a pound to spend on improving the UK housing stock, what would you spend it on? The answers reveal the full breadth of the problem.
Pablo, based in Spain, with a Mediterranean architectural perspective, would spend it on shading. In southern European countries, generous balconies, awnings, and shutters are not aesthetic choices; they are a centuries-old vernacular response to solar gain. UK residential buildings have large windows, flat facades, and almost no external shading provision. During a heatwave, closing windows during the day and ventilating only at night is the single most effective intervention available – and it costs nothing. But most people in the UK don't know to do it.
Helen adds a cultural dimension: the expectation of total thermal comfort, year-round, in every room, is itself part of the problem. Central heating only became standard in UK homes in the 1970s. The assumption that a house should be uniformly warm in winter and uniformly cool in summer is historically recent and, in the context of climate change, increasingly difficult to sustain. Small behavioural adjustments – dressing appropriately, heating one room rather than the whole house, blocking the sun with curtains – are not failures of technology. They are part of the solution.
Martin notes that Scotland, with peak summer temperatures rarely exceeding 28 degrees, manages without domestic air conditioning. The question is whether passive measures: shading, improved natural ventilation, and heat rejection at the facade, can contain the need for mechanical cooling to the extreme southeast, rather than allowing it to become a national expectation. Because air conditioning is itself a significant energy load, and adding it to a poorly insulated housing stock pushes the problem in entirely the wrong direction.
The retrofit imperative
The conversation pivots to where the real challenge lies: the existing housing stock. New build regulations have improved significantly and continue to tighten. But new build represents a small fraction of the total. The 80 to 90 per cent of UK homes built under regulations that gave no consideration to climate change are where the problem sits, and retrofitting them is orders of magnitude harder than building new.
Pablo is direct: the only way to meet the UK government's 2050 net zero commitment is to retrofit the existing residential stock to Passivhaus standard – ultra-low air permeability, triple glazing, MVHR heat recovery, 300mm insulation. That is the scale of ambition the commitment implies. The gap between that aspiration and current progress is enormous.
The barriers are structural. Wall insulation – whether internal or external – involves capital costs in the tens of thousands, significant disruption, and genuine technical risks around condensation and workmanship. Heat pumps, widely presented as the primary decarbonisation tool for heating, only work efficiently in well-insulated buildings. Installing a heat pump in a poorly performing envelope produces eye-watering energy bills – a problem already being experienced by early adopters who were not told the full picture. The sequencing matters enormously: fabric first, then low-carbon heat. But that sequencing is not currently reflected in government incentive structures, which subsidise heat pump installation without requiring the prerequisite fabric upgrades.
The financing problem
Helen identifies the capital cost barrier as the most intractable. Most homeowners do not have tens of thousands of pounds available to spend on fabric upgrades. The Green Deal – the government's attempt to resolve this through a loan repaid via energy bill savings – failed to achieve meaningful uptake. Schemes that require households to self-finance improvements before accessing incentives will not reach the households that need them most, many of whom are already in fuel poverty.
Martin raises the alternative: would some of the money earmarked for individual property upgrades be better spent on decarbonising the energy supply directly – through renewables and nuclear – so that existing, inefficient buildings run on zero-carbon electricity? Pablo's response is clear: a poorly insulated building running on clean electricity will still have unmanageable running costs. The envelope has to improve. But how that improvement is financed – and how homeowners are supported to make the right sequenced decisions for their specific property – remains an unsolved problem.
A perfect storm
Pablo's diagnosis of the UK situation is stark: it is a perfect storm. The climate is wrong for the building stock. The building stock is wrong for the emerging climate. The typology – a national preference for detached and semi-detached houses over the thermally efficient apartment blocks that are more common in continental Europe – compounds the inefficiency. And the distribution of people across that stock adds another layer: older households occupying large family homes long after children have left, while growing families cannot find adequate housing. The energy inefficiency of a four-bedroom house occupied by two people is a systemic problem that no amount of wall insulation alone will address.
The conclusion – reached by all three speakers, if reluctantly – is that the pace and scale of what is required cannot be achieved by voluntary behaviour change alone. This is not a comfortable position for people who would prefer a less interventionist answer. Martin is candid about it: at the speed climate change demands, a gradual cultural shift is not enough. Government action – whether through tightened standards, targeted incentives, or better public information – is a necessary part of the response.
What that action should look like, and how it avoids repeating the failures of previous schemes, is a question the episode does not fully resolve. But it frames it with unusual clarity.
Martin Wood is co-founder and Director at Bryden Wood. Pablo Gugel is Director of Sustainability. Helen Hough is an Associate.
