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No doubt I鈥檓 not the only person to have been cold-called and urged to take advantage of the grant available under the government鈥檚 green homes retrofitting initiative. On both occasions the caller made it sound dead easy until I explained that, like many others in our village, our house has an exposed timber frame with brick infill. By the time I鈥檇 mentioned that the village is in a conservation area and that most of the houses are at least 200 years old and some are listed, they鈥檇 lost interest. But the calls forced me to confront some fundamental realities.

For practical and aesthetic reasons, it feels very unlikely that the insulation needed to bring our home up to scratch could be applied externally, though that鈥檚 generally preferable in terms of performance. With solid walls, the only alternative is to insulate internally.

I鈥檓 no expert but I imagine we would need at least 200mm of insulation to make a real difference. Like the majority of homes here, our house is detached. As most rooms have two outside walls, 鈥榯he shrinkage鈥� would be as painful as the upheaval. The shower room would no longer function and the kitchen would have to be taken out, shortened and put back. We would need to excavate the ground floor to install insulation and that would probably require underpinning. We would have to take down all the ceilings on the top floor (again鈥�) to increase the roof insulation and replace all of the windows and external doors.

At least 拢80k later, I can guarantee that however hard we鈥檇 tried, we鈥檇 be left with gaps, cold bridges and lots of messy bits. And probably still trying to get the local conservation officer to allow us to install an external power pod to charge our electric car.

Don鈥檛 get me wrong, I absolutely understand that this needs to happen and I鈥檓 not seeking sympathy. I鈥檓 just trying to understand how it might work 鈥� not only in the home I know best, but also in the other 20 million homes in England that need upgrading. Most will be less challenging than ours, but the majority won鈥檛 be easy or cheap. 拢10k (the maximum grant) doesn鈥檛 go far when you start to work through the process; it already feels as though homeowners and landlords would need to make a substantial contribution to the cost of a 鈥榩roper job鈥�. And, of course, it must be a proper job if we are to succeed in the mission and avoid the well-documented failures of previous retrofitting attempts.

Given that we need to be upgrading about 2,700 homes every day from now to 2050, this surely needs to be tackled in a much more intelligent, comprehensive and coordinated way

The questions keep coming. Given the severity of the climate emergency, how much individual and collective choice should we have? Are we allowed to mind that terraced streets could be changed forever because individual owners decide to overclad at random? Should we be lobbying for planning permission to instil some consistency and, if not, how do you manage dips in the roofline and the eaves gutter when some homes have got fatter and others haven鈥檛? Should the owners of semi-detached homes have a 鈥榙uty to co-operate鈥�? Should someone insist that it鈥檚 done street by street 鈥� it ought to be cheaper? And what are the sanctions for not playing ball? It鈥檚 not as though we can confine our emissions to our own back yard, after all.

Concerning then, that and, as far as I can see, without a plan or a monitoring regime. Given that we need to be upgrading about 2,700 homes every day from now to 2050, this surely needs to be tackled in a much more intelligent, comprehensive and coordinated way?

Our housing stock is the oldest in Europe. Based on recent performance, up to 85% of today鈥檚 homes will still exist in 2050. Perhaps many of them shouldn鈥檛? How should we weigh the personal trauma and embodied carbon caused by demolition against the operational energy and other advantages of rebuilding for a 200-year life?

Before sleepwalking into something we have barely begun to think about, someone needs to do a cost/benefit analysis to determine which homes (or perhaps which streets and neighbourhoods) are, and aren鈥檛, worth the investment. My guess is that it鈥檚 probably not worth spending more than 拢10k on a building that might only last another 25 years, even supposing the owners were able to meet the additional cost. But I have no idea where the tipping point is and, anyway, it鈥檚 much more complicated than that.

The targeted, but significant, demolition of tired suburban housing could triple density. Scaled up, that has the potential to avoid building on any more greenfield sites and might even release land for food growing, recreation and/or re-wilding. At what point do those benefits outweigh the release of embodied carbon and who should make that decision? What guarantees will be offered to those who choose to retrofit 鈥� it should surely involve an independent assessment and 鈥榖efore and after鈥� thermal imaging and airtightness testing?

And let鈥檚 not forget that climate change is only one casualty of our failure to build better housing. Only 9% of existing homes provide even the four basic accessibility elements that make a home 鈥榲isitable鈥�. Over the last decade, the number of households with one or more adaptations for a person with a disability has risen by just 1% (to 10%). Given the cost and disruption of a comprehensive green retrofit, it would be madness not to address other serious pre-existing shortcomings, such as poor accessibility, unsafe wiring and potential fire risks, at the same time 鈥� but who would pay for those?

Spending 拢10bn on improving all of the 鈥榩oor housing鈥� in England would save the NHS 拢1.4bn a year

In my search for answers I came across a report published in July by the New Economics Foundation: A Green Stimulus for Housing: The macroeconomic impacts of a UK whole house retrofit programme. Calling for a 鈥榗omprehensive policy approach鈥� (there鈥檚 a radical thought鈥�), a new suite of regulations and new funding instruments, it sensibly advocates a 鈥�whole house approach鈥�; explicitly mentioning wrapping-in age-related adaptions and fire safety improvements. It recommends the creation of a 鈥�National Retrofit Taskforce鈥� and suggests that local authorities should play a key role in creating demand and growing local supply chains鈥�.

In the best-case scenarios, the economic forecasts are upbeat. The authors estimate that every 拢1 spent on retrofitting 鈥榝uel-poor homes鈥� would save 拢0.42 in NHS spending, and cites evidence that spending 拢10bn on improving all of the 鈥榩oor housing鈥� in England would save the NHS 拢1.4bn a year 鈥� paying for itself in just over seven years. A no-brainer if it works.

Understandably, it leaves the practicalities of retrofitting to others. The RIBA perhaps? Impressive though it is, rather than tread on the economists鈥� toes with a list of recommendations to Treasury, we might have expected to address some of the more tangible elephants in the room that I鈥檝e touched on: how to ensure that every home is upgraded in the most effective way while managing the visual impacts of piecemeal interventions on streets and neighbourhoods 鈥� and when to advocate renewal.

Fortunately, LETI (London Energy Transformation Initiative) is on the case with at least some of this.

Following the success of the Climate Emergency Design Guide published at the start of the year, an even larger group of dedicated experts is putting together a set of generic case studies comprising different housing typologies to help everyone understand the principles and the best approach to take. No quick-fix-vaccine for decarbonisation; just a lot of hard, but vital, work.