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Owners of older and traditionally constructed homes are increasingly facing a common challenge: how to improve energy efficiency, reduce carbon emissions and cut running costs, whilst preserving the character that makes these properties so desirable.
As a building surveyor, I regularly advise clients on the refurbishment of older residential properties, the majority of which were constructed long before modern energy efficiency standards existed. While these buildings can be more expensive to heat than modern homes, they often possess qualities that can be enhanced through carefully considered retrofit measures. With the right approach, older homes can be more energy efficient and remain comfortable, resilient and attractive places to live.
Successful retrofit starts with understanding how an older building functions. Traditional buildings were typically constructed using materials such as stone, brick, lime mortar and timber, which manage heat and moisture very differently from modern construction methods.
Too often, energy efficiency measures are considered in isolation. However, with older properties a ‘whole building’ approach is essential. Insulation, ventilation, heating systems, moisture movement and occupant behaviour all interact with one another, and failing to consider these relationships can lead to unintended consequences, including condensation, dampness and the deterioration of building fabric.
Before undertaking improvement works, it is important to understand the building's construction, condition and heritage significance. From there, targeted interventions can be identified that improve performance whilst respecting the property's character.
In my experience, the most successful projects typically adopt a ‘fabric-first’ approach, as reducing heat loss through the building envelope often provides the greatest long-term benefits before considering low-carbon heating technologies.
Such measures may include:
Many older homes can achieve significant improvements in comfort and energy efficiency through relatively modest interventions. Importantly, these measures can often enhance EPC ratings without losing original architectural features.
Retaining existing building elements should also be considered wherever feasible. Original timber windows, for example, can often be repaired and upgraded at a lower environmental cost than replacement. When maintained correctly, traditional timber windows can provide many decades of additional service life.
As the UK transitions towards lower-carbon heating, many owners are exploring alternatives to systems that are reliant on fossil fuels.
While every property should be assessed individually, I have worked on several refurbishment projects where fabric improvements have been successfully combined with technologies such as air source heat pumps and underfloor heating. When designed appropriately, these systems can improve efficiency whilst helping to reduce operational carbon emissions.
However, heating upgrades are rarely a simple ‘plug and play’ exercise, particularly within older buildings. Improving thermal performance from the outset will often enable heating systems to operate more effectively and economically.
The conversation around energy efficiency often focuses on retaining heat during winter months, but climate adaptation is becoming equally important.
As summers become warmer, overheating is increasingly affecting older homes, particularly those with south-facing glazing. Traditional solutions such as shutters, awnings, canopies and external shading can maintain the character of a property and be highly effective in reducing solar gain.
Measures such as these can often provide a simple and low-impact means of improving occupant comfort without relying on energy-intensive cooling systems.
Climate change is also increasing the frequency of extreme rainfall events, making effective water management ever more important.
Regular maintenance of gutters, downpipes and drainage systems remains one of the most cost-effective ways of protecting any property. In some circumstances, additional measures such as rainwater harvesting, attenuation systems and flood resilience improvements may also be appropriate.
Traditional materials can offer surprising advantages – lime mortar, lime plaster and other vapour-permeable materials allow moisture to evaporate naturally, often helping buildings recover more effectively following water ingress than modern impermeable materials such as cement render and gypsum plaster.
The way we measure energy performance is also changing.
Domestic EPCs are currently based on the Standard Assessment Procedure (SAP) and Reduced Data Standard Assessment Procedure (RdSAP). However, the government is developing the Home Energy Model which is expected to replace these methodologies and form the basis of future domestic energy assessments.
The Home Energy Model is intended to provide a more sophisticated assessment of how homes perform in practice, accounting for a wider range of building characteristics and occupant behaviour. While the detail is evolving, the direction of travel is clear: improving the fabric performance and overall efficiency of existing homes will remain central to achieving the UK's net zero ambitions.
For owners of older properties, this reinforces the importance of considering long-term, holistic improvements rather than simply targeting individual EPC metrics.
Improving the energy efficiency of older homes should not be viewed as a choice between sustainability and heritage. In many cases, the most successful projects demonstrate that these objectives can work hand in hand.
By understanding how traditional buildings perform, adopting a fabric-first approach and implementing carefully considered upgrades, owners can create homes that are more comfortable, resilient and energy efficient whilst safeguarding their historic character for future generations.
Contact Darren Midgley
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