The Reuse Instinct: Why the Building You Already Own May Be the Costliest Way to Deliver the Service

By Kane Lennon, Director, Local Government Property Consultants (LGPC)

When an authority holds an ageing building it no longer needs in its current use, and also faces a pressing service need - temporary accommodation, supported living, specialist provision for adults with a learning disability - the two problems appear to solve each other. Convert the building. Reuse what you already own. Avoid the cost and the controversy of demolition, avoid a capital outlay on a new site, and meet a real need with an asset already on the balance sheet. It is the prudent answer, the thrifty answer, and increasingly the answer that planning policy and the carbon agenda are understood to favour.

It is also, on a significant minority of sites, the wrong answer - and wrong in a way that is easy to miss precisely because the instinct behind it is sound. This article is about how to tell the difference.

Retrofit-first is a good default, not an answer

Let me be clear at the outset, because the argument that follows is easily misread. The general direction of travel is right. Reusing an existing building is, in most cases, the lower-carbon path: the embodied carbon in a new building is on average around twice that of a deep retrofit, and a sound structure capable of adaptation should usually be adapted rather than demolished. A growing number of authorities have adopted retrofit-first positions in their planning policy, and they are right to. Reuse conserves embodied carbon, avoids demolition waste, and is frequently quicker and less disruptive than rebuilding.

None of that is in dispute. The difficulty is that "retrofit-first" is a default, and a default is a starting presumption, not a conclusion. It tells you where to begin the analysis, not how it ends. On most buildings the presumption holds and reuse is the right outcome. On a particular kind of building - ageing, structurally misaligned with the service it would now be asked to house, and carrying liabilities the reuse case quietly assumes away - the presumption can lead an authority into committing major capital to an outcome that serves neither the service nor the balance sheet well. The skill is in knowing which building is in front of you.

Reuse does not avoid the liability - it inherits it

The first thing the reuse case tends to understate is that converting a building does not wipe its existing liabilities. It absorbs them.

An ageing building brought back into use for a new purpose still carries whatever maintenance backlog has accumulated against it, and still carries whatever regulatory retrofit obligation its energy performance implies. Those costs do not disappear because the use has changed; they sit underneath the conversion. The conversion cost is therefore not the cost of delivering the new service - it is the cost of delivering the new service on top of clearing the backlog and meeting the retrofit standard. A business case that compares only the conversion figure against the alternative of a new building is comparing the wrong numbers. The honest comparison sets the whole retained-building cost - backlog, plus retrofit, plus conversion - against the alternative.

When that fuller sum is done, the reuse option is often a good deal less thrifty than it first appeared. The building was never free; it came with a bill that continued operation had simply been deferring. Repurposing does not settle that bill. It inherits it, and adds the conversion cost on top.

This points to the real trap, which is behavioural rather than financial. Ownership creates a bias toward reuse - the building is there, it is already on the balance sheet, and using it feels like the responsible thing to do. That bias operates whether or not reuse is actually the best option, and it is strongest precisely where it is most dangerous: on the ageing, awkward assets where the case for reuse most needs testing.

The professional guidance is unusually direct about why this bias is a problem. The long-standing default to retain existing assets, the RICS and CIPFA framework on strategic public sector asset management observes, reflects the short-term horizon of the annual budget cycle rather than sound long-term economics; authorities are urged to weigh "alternative and more transformative asset solutions" that "can provide lower whole life costs," and to retain assets "only where there is a demonstrable need to support service delivery and they are fit for purpose." Ownership, in other words, is an advantage only where the building remains the most efficient platform for delivering the service. Once backlog, retrofit and adaptation costs are properly counted, an owned building can prove more expensive to use than accommodation procured elsewhere. Already owning the asset does not remove the economic cost of using it; it only obscures it.

The ownership trap

There is a structural variant of this problem that catches authorities out repeatedly, and it arises wherever the asset is not wholly owned.

Many older public buildings - particularly in the housing, care and supported-accommodation space - sit in shared ownership: a joint freehold, a long lease held by a housing association, a management agreement splitting cost and control. While that arrangement holds, the liabilities are shared too; the authority's exposure to the backlog and the retrofit obligation is a proportion, not the whole.

The trap springs when the partner wants out - a housing association reshaping its portfolio, or a co-owner with no appetite to fund the retrofit of a building delivering someone else's service. At that point, repurposing the building for the authority's own service is no longer a neat conversion of a shared asset. It becomes an acquisition of the partner's interest, followed by the retrofit of the whole building, now carried alone. "Repurpose what we already own" quietly becomes "buy out our partner, then retrofit the entire building at one hundred per cent of the cost we previously shared." The service case may still justify it - but it is a materially larger commitment than it first appears, and the business case has to be built on the consolidated figure, not the shared one.

The compromised-building problem

The most expensive mistake is often not the financial one. It is forcing a specialist service into a building that was never designed to support it - and the cost of that shows up in the quality of provision long after the capital has been spent.

Some services can be delivered perfectly well within converted general-purpose accommodation. Others cannot. Specialist provision for adults with a learning disability, for example, frequently needs purpose-designed space: particular room configurations, accessibility and wheelchair standards, staff accommodation and communal areas, circulation and sightlines designed around the model of care. Retrofitting a building designed in the 1980s for a different client group to that standard is not always possible, and where it is possible it is not always advisable. The authority can spend more than the headline retrofit figure forcing an unsuitable building toward a standard it was never designed to meet - and still end up with a compromised building that serves the service less well than purpose-built provision would.

This is the point at which the reuse instinct can do real harm: capital spent conscientiously on an unsuitable building can still leave the people the service exists to support worse served than purpose-built provision would. The carbon logic and the thrift logic both point toward reuse; the service-quality logic, on this kind of building, can point firmly the other way. A good appraisal holds all three in view rather than letting the first two settle the matter.

What the housing sector is already learning

This is not a theoretical concern. The part of the public realm that has confronted the retrofit-versus-replace question earliest, and at the greatest scale, is the social housing sector - and its experience is instructive precisely because registered providers are sophisticated, long-horizon asset managers with every incentive to retain and improve rather than dispose.

The scale of the task is sobering even for them: the National Housing Federation and Savills have estimated that housing associations face a further £36 billion to bring their homes to EPC C and install clean heat technologies on the path to 2050 - and that is for a sector whose stock already outperforms the rest of the market. As ever, the bill is concentrated in the oldest, hardest-to-treat stock, where deep retrofit is most expensive and least certain to succeed.

Faced with that, the most disciplined social landlords have stopped treating retrofit as an automatic answer. They now run the dispose-versus-upgrade calculation explicitly on their worst-performing assets, weighing the cost and uncertain outcome of deep-retrofitting an ageing property against releasing it and replacing it with new stock that arrives compliant and carries no retrofit liability. The lesson is not "demolish" - registered providers retrofit at volume and will continue to. It is that for a specific tier of ageing, hard-to-treat assets, even the owners most committed to retention have concluded that pouring capital into the existing building is not always the best use of it.

That lesson does not stop at the housing front door. The same logic applies to ageing operational and commercial buildings across the public estate - offices, depots, care settings, community facilities. The asset class differs, but the structure of the decision is identical: an older building, expensive and uncertain to bring to standard, set against the option of realising its value and providing the service from accommodation that meets the standard by design. Registered providers have simply reached that junction first, because the regulatory pressure landed on residential stock first. The wider public estate is arriving at the same junction now.

The honest weighing

None of this is an argument against meeting the service need. The need for temporary accommodation, for supported living, for specialist provision is real, evidenced and pressing, and an article that waved it away would deserve to be ignored. The argument is narrower: that the existence of a real need does not by itself make reusing a particular building the best way to meet it.

The question an appraisal has to answer is not "could this building house the service" - the answer is usually yes, at a price - but "is committing this capital, to this ageing and misaligned building, the most effective route to delivering this service over the next decade". The alternative is rarely "do not provide the service". It is "realise the value tied up in the existing asset, and commission the service in accommodation suited to it, part-funded by the receipt". Set out that way, the choice is not between reuse and waste. It is between two ways of meeting the same need, one of which carries the inherited liabilities of an unsuitable building and one of which does not.

This is, in truth, simply orthodox appraisal discipline. HM Treasury's Green Book asks decision-makers to start from the objective and appraise a range of options on their whole-life costs and benefits, rather than starting from a preferred solution and working backward to justify it. The common factor in almost every problematic reuse project is a failure of exactly that discipline - an incomplete appraisal that compares the conversion cost against the cost of new provision, but never the full retained-asset cost against the full cost of the alternative. For a finance team, this is the point that matters most. A conversion can look inexpensive simply because the asset is already owned, but ownership is not cost-free, and the relevant comparison is never between spending and not spending; it is between alternative uses of the same constrained capital. Every pound committed to forcing an unsuitable building into a new role is a pound unavailable for the assets already aligned with future service delivery. Once backlog, retrofit, ownership structure, service suitability and whole-life cost are all brought into the frame, the apparent advantage of reuse can narrow sharply - and sometimes reverse.

The middle path

It is worth saying that this is rarely an all-or-nothing decision, and the most useful outcomes often sit between the poles. In some cases the highest-value outcome is neither full retention nor full disposal, but restructuring the site so that retained service provision is funded by the value released elsewhere on it. Where a site has the capacity, that approach can capture much of the value on both sides: retaining or creating a service use in one part while redeveloping the other for a capital receipt, delivering the service without loading the whole-site retrofit and backlog onto the authority, and part-funding the provision from the value released alongside it. It is more complex to structure than a straight conversion or a straight disposal, and it is not available everywhere - but where it is, it frequently outperforms both of the simpler options.

The question for councils

The reuse of existing assets is sound general practice, and authorities are right to begin there. But beginning there is not the same as ending there, and the buildings most likely to mislead are the ones where the instinct is strongest: a serviceable older building, a pressing need, and an apparent chance to solve both at once. On those sites, the prudent-looking answer can commit an authority to the larger cost, the consolidated liability, and the compromised building all at the same time.

LGPC's experience is that the reuse question is best answered with the full figure in front of you, not the partial one - the whole retained-building cost, the ownership position resolved rather than assumed, and the service genuinely tested against purpose-built provision before the capital is committed. The question is not whether a building can be reused; most can. It is whether reusing it represents the best long-term use of scarce capital once backlog, retrofit, ownership structure, service suitability and the alternative routes to delivery are weighed together. A strategic estate review provides exactly that comparison - the evidence base for deciding not whether the service matters, but which way of delivering it represents the best use of the capital available.

About the Author

Kane Lennon is a Director of LGPC (Local Government Property Consultants), established in September 2024. LGPC forms part of the award-winning consultancy team recognised as Consultancy of the Year 2025, specialising in innovative estate strategy, asset rationalisation, surplus land release, and housing-focused advisory for councils and education providers across England.