It’s an important subject that rears its head on a weekly basis. Across the country, suitable development land is becoming increasingly difficult to acquire. As an example, here in Huddersfield, a well-established and heavily built-up area, opportunities for development often come with something already on the site.
As a local architectural practice, we see this in many forms. It might be a house occupying a site with greater potential, a redundant agricultural building waiting for a new use, or one of the many former mills and industrial buildings found throughout the area. In each case, the same question arises: is it better to renovate and work with what is already there, or demolish and start again?
When Is It Right to Demolish a Building Instead of Renovating It?
When buying a property with an existing building, one of the biggest questions is whether to renovate what is already there or demolish it and start again.
With land increasingly scarce, it is common for properties to be bought as much for the potential of the site as for the building itself. An old house might be replaced with a new one, an outdated commercial building redeveloped, or an agricultural site containing barns transformed into a new home. But demolition isn’t always the obvious answer. Equally, keeping an existing building simply because it is old isn’t necessarily the most sustainable or practical solution.
So how do you decide?
The case for keeping an existing building
There is a strong environmental argument for retaining and reusing buildings. An existing building already contains materials, energy and labour that have gone into its construction. This is often described as embodied carbon — the emissions associated with extracting raw materials, manufacturing products, transporting them and constructing a building. Demolishing an existing structure and replacing it means much of that investment is lost, while new materials are required for the replacement.
However, that doesn’t automatically make renovation the greener option. An old building may need extensive structural repairs, a new roof, windows, insulation, services and major internal alterations. If much of the building ultimately has to be rebuilt, the environmental benefit of retaining it may be less significant than expected.
A sensible decision therefore needs to consider the whole life of the building, rather than simply whether demolition is involved.
Embodied carbon versus operational carbon
There are two important carbon questions when comparing renovation with new build. Embodied carbon relates to the materials and construction of a building, while operational carbon relates to the energy required to run it — heating, cooling, lighting and other services. An existing building may contain significant embodied carbon, but it may also be difficult and expensive to make energy efficient. A new building creates additional embodied carbon through construction, but can potentially be designed to use considerably less energy throughout its lifetime.
The answer isn’t therefore simply:
“Old building = sustainable.”
Nor is it:
“New building = energy efficient.”
The better question is which option creates the best balance of embodied carbon, operational energy, materials, longevity and future adaptability.
A building-by-building decision
There is no universal rule because buildings are not all equal. A Victorian house, a 1970s bungalow, a stone farmhouse, an agricultural barn and a commercial warehouse can have completely different characteristics. The same building can also have very different potential depending on what you want to use it for. An existing house may be relatively straightforward to extend and remodel. A warehouse might have an excellent structural frame but require substantial work to provide daylight, insulation and modern services. An old barn may have enormous architectural character but be much harder to adapt than its appearance suggests.
The question shouldn’t simply be:
“Can we renovate it?”
Almost anything can be renovated if enough money is spent. The more useful question is:
“Can we turn this building into what we need, in a sensible and sustainable way?”
What about old barns? Barns are a particularly interesting case. Traditional agricultural buildings are often sought after because they have qualities that are difficult to reproduce in a new building. Timber structures, natural stone or brick, large openings, generous proportions and a strong connection with the surrounding landscape can all contribute to their appeal. There can therefore be a compelling case for preservation and sensitive conversion. But a barn conversion isn’t automatically sustainable. Creating a comfortable modern home might require insulation, new floors, roof alterations, windows, heating systems, bathrooms, kitchens, drainage and significant structural work.
The challenge is to improve the building without losing the qualities that make it special. Sometimes the best solution is a careful conversion. In other cases, a combination of restoration and new construction may work better. And sometimes the existing building simply isn’t capable of accommodating the proposed use without disproportionate intervention.
When might demolition make sense?
There are circumstances where demolition can be the more sensible option.
For example, an existing building may have:
- Serious structural problems that make retention difficult or uneconomic.
- Poor foundations or significant movement requiring major reconstruction.
- Extensive damp, decay or deterioration.
- Hazardous materials, such as asbestos, requiring significant remediation.
- A layout fundamentally unsuitable for its intended future use.
- Poor levels of natural light, ventilation or accessibility that are difficult to resolve.
- Very poor energy performance that cannot reasonably be improved.
- Little architectural or heritage significance.
- A structure that would require so much rebuilding that very little of the original building would remain.
There can also be a wider site consideration. An existing building might occupy the site inefficiently, prevent a sensible relationship with the garden or landscape, or make it difficult to create a building that works well for its surroundings. In these situations, a well-designed replacement may provide a better long-term outcome.
A useful checklist before you decide
Before committing to demolition or renovation, it is worth asking:
- What is the condition of the existing building?
Has the structure been properly assessed? Look at the foundations, walls, roof, floors, damp, movement, previous alterations and services. A building that appears sound may have significant problems hidden behind its finishes.
- What is actually worth keeping?
Is the value primarily structural, architectural, historical or simply sentimental? Some buildings contain elements that are worth retaining even if the whole building cannot be. A timber frame, masonry walls, roof structure or other materials may potentially be incorporated into a new scheme.
- What does the building need to become?
Think about the future use rather than just the current building. Will it work as a home, office, workshop, holiday accommodation or another use? Can it provide the space, light, circulation, accessibility and comfort required?
- How much intervention will renovation require?
If renovation means replacing the roof, floors, windows, services, insulation, internal walls and large parts of the structure, ask how much of the original building is actually being retained. At some point, “renovation” can become closer to reconstruction.
- What is the whole-life carbon impact?
Consider both the carbon already invested in the building and the carbon required to bring it up to standard. Then compare this with the carbon associated with demolition, construction and the future operation of a replacement building.
- Does the building have heritage or planning value?
A building may be listed, locally significant, within a conservation area or otherwise important to the character of the site. Planning and heritage considerations should be understood before assuming demolition is an option.
- Which option will last longer?
A successful building should not simply meet today’s requirements. Ask whether it can be adapted in the future, whether it will remain comfortable as the climate changes, and whether its design and construction are robust enough to last for generations.
Could the answer be somewhere in between?
It is easy to think of the choice as either renovate everything or demolish everything.
In reality, there are many possibilities between the two. You might retain the original building and add a contemporary extension. You might remove an unsympathetic later addition while preserving the original structure. You might retain a barn’s timber frame but introduce a new internal arrangement. Or you might demolish the existing building while salvaging and reusing valuable materials elsewhere. This is where good architectural design can make a significant difference. Instead of treating the existing building as something that must either be preserved or removed, we can ask what parts contribute value and how they can form part of the building’s future.
So, when is demolition the right choice?
There isn’t a simple answer.
Renovation is often worth serious consideration when the existing building is structurally sound, adaptable, has architectural or heritage value, and can be upgraded without disproportionate intervention. Demolition may be appropriate when the building is fundamentally unsuitable, structurally compromised, of limited significance, or would require such extensive reconstruction that little of the original building would remain. Sustainability should be part of that decision — but not the only consideration. The best solution needs to balance carbon, cost, planning, heritage, performance, materials, longevity and the experience of the people who will use the building.
Ultimately, the question isn’t simply:
“Should we renovate or demolish?”
It is:
“What is the best future for this building and this site?”
That is a question worth answering before committing to a design or development strategy. Considering a renovation, barn conversion or replacement building? An early architectural appraisal can help you understand what is worth retaining, what could be changed and what the realistic potential of the site might be. At Eight_OneTwo Architects, we work with existing buildings as well as new developments, helping clients make informed decisions about renovation, conversion, extension and replacement.
Sometimes the best building is already there. Sometimes the site is better served by starting again. The important thing is understanding the difference.