Have you ever wondered why certain areas of your home feel uncomfortably cold, even when the heating is on full blast? Understanding the reasons behind cold house walls and resolving any issues is essential for creating a cosy and energy-efficient living environment. Here, we’re looking at the primary cause of cold walls and explore the most effective solution: insulation.

Poor Insulation – The Primary Reason for Cold Walls

Poor insulation is often the primary culprit behind cold walls. When a home lacks adequate insulation, heat can easily escape through walls, windows, and gaps, leading to chilly indoor temperatures. In fact, studies have shown that approximately 35% of heat loss in homes occurs through walls and gaps. This means if your walls are not insulated, you are not only losing heat but also money on your central heating bill.

Age of the Property

The age of your property can significantly impact its insulation quality. Older homes, especially those with solid walls, are more prone to poor insulation. Unlike modern properties with cavity walls designed for insulation, older homes may lack this crucial feature, making them vulnerable to heat loss.

Types of Wall Insulation

Understanding the type of walls in your home is crucial for determining its insulation requirements. Solid walls and cavity walls have different insulation needs, with solid walls requiring external insulation for optimal thermal protection.

Cavity Wall Insulation: A Necessary Step

For homes with cavity walls, cavity wall insulation is essential for maximising insulation effectiveness. Filling the gap between inner and outer walls with insulation material helps prevent heat from escaping, keeping indoor temperatures comfortable year-round. 

External Wall Insulation: The Ultimate Solution

External wall insulation is widely regarded as the most effective solution for solid walls. By adding a layer of insulation material to the exterior of the building, external wall insulation provides superior thermal protection, reducing heat loss and improving energy efficiency. Cavity walls will need to be filled first, but once they are, external wall insulation can also be added for maximum thermal efficiency.


DIY Tips for Improving Insulation

In addition to professional installation, there are several DIY steps homeowners can take to improve insulation effectiveness. Simple measures such as sealing drafts, adding weatherstripping, and installing thermal curtains can help enhance insulation and reduce heat loss.

Signs of Poor Insulation

Identifying signs of poor insulation is key to addressing the issue effectively. As well as cold external walls, look out for drafts and see if your energy bills are more expensive than they should be. If you notice any of these signs, it may be time to invest in insulation improvements.

Consequences of Cold Walls

Cold walls not only compromise comfort but can also have financial and health implications. At a time when energy bills are rising even in well insulated homes, it is especially important to improve the thermal efficiency of your home and keep these costs down. In addition to the financial burden of a poorly insulated home, there is also a much higher risk of mould growth from condensation which can damage the property and affect occupants’ health.

Cost Considerations

The cost of insulation installation can vary depending on various factors, including the size of the property and the chosen insulation materials or method. While the upfront investment may seem significant, the long-term savings on energy bills and improved comfort make it a worthwhile investment.

Environmental Benefits of Insulation

In addition to its financial and comfort benefits, insulation also contributes to environmental sustainability by reducing energy consumption and lowering carbon emissions. Because they improve energy efficiency, well-insulated homes play a vital role in combating climate change.

Maintenance and Longevity

Proper maintenance is essential for ensuring the longevity and effectiveness of insulation. Regular inspections and repairs can help address any issues before they escalate, prolonging the lifespan of insulation materials and maximising their performance.


Having cold walls in your home may be uncomfortable, but the reasons behind this are usually straightforward. By addressing poor insulation through measures such as external wall insulation and cavity wall insulation, homeowners can enjoy warmer indoor temperatures, lower energy bills, and a reduced environmental footprint.

If you think your home is ready for an external wall insulation upgrade, please get in touch.