A significant amount of heat — often around a quarter — can escape through the roof if your insulation isn’t up to modern standards. But heat loss can also occur through walls, floors, windows, and other areas of your home.
Heat rises, escapes, and spreads — and without the right insulation in place, your home could be losing warmth in multiple areas without you even realising.
It’s not just one area — it happens across the whole property
Most homeowners focus on one area — but in reality, heat loss happens across the entire property. Warm air naturally rises and escapes through the roof, but it can also pass through walls, floors, windows, and small gaps around your home.
If your insulation isn’t performing properly, your heating system has to work harder to maintain temperature — which can increase energy usage and reduce comfort.
Because heat rises, the roof is often where the most significant losses occur. A significant amount of heat — often around a quarter — can escape through the roof if your insulation isn’t up to modern standards. Heat naturally rises, so without effective insulation in place, it escapes through your roof — increasing energy bills and reducing comfort in your home.
These figures can vary depending on the property, age, and insulation quality
Heat loss is rarely just one issue. Most homes lose heat from multiple areas simultaneously — which is why it’s important to look at your home as a whole.
Because heat rises, the roof is one of the most common areas where warmth escapes
If loft insulation is missing, thin, or outdated, a significant amount of heat can be lost through the roof. Modern standards recommend at least 270mm of mineral wool or equivalent — many older homes have far less.
Higher heating costs — your boiler runs longer and works harder to replace heat that’s constantly escaping
Colder upstairs rooms — particularly noticeable in bedrooms directly below the roof
Uneven temperatures — rooms vary significantly even when the heating is on
Loft insulation is typically one of the most cost-effective improvements a homeowner can make. It directly addresses the area where heat is most likely to escape first.
Walls can account for the largest portion of heat loss in many homes
If cavity wall insulation is missing or solid walls are not insulated effectively, heat can pass through easily. This is especially common in older properties built before insulation standards were introduced.
Suitable for homes built from the 1920s onwards with a cavity between the inner and outer wall. Insulation material is injected into the cavity.
Older properties with solid walls require insulation applied internally or externally. More involved but can significantly improve performance.
Small gaps and older materials add up over time
Poor seals, older glazing, and draughty frames allow warm air to escape and cold air to enter — even when everything is shut.
Cold air can rise from below if flooring is not insulated properly. This can make rooms feel colder even when the heating is running at full temperature.
Gaps around pipes, skirting boards, letterboxes, and loft hatches all allow cold air in and warm air out. Simple draught-proofing can reduce this.
Most homes don’t lose heat from just one area. It’s usually a combination of roof, walls, gaps, and flooring working against each other. That’s why it’s important to look at your home as a whole — not just one section.
The good news: addressing even one or two of these areas can make a meaningful difference to your comfort and energy bills. A quick assessment can show you where to start.
Modern insulation solutions are designed to improve performance across multiple areas of the home. Rather than focusing on just one area, the right approach can help improve heat retention across your property.
Reflective foil insulation works by helping to reduce radiant heat loss, supporting your existing insulation and improving overall performance. It can be an effective option for many properties, particularly where traditional insulation alone may not be sufficient.
Modern solutions such as reflective foil insulation are designed to help reduce heat loss and improve overall energy efficiency — working alongside or instead of traditional materials depending on the property.
Learn about foil insulation →Every property is different. The amount of heat you may be losing depends on your insulation, your property type, and your layout. That’s why a quick assessment is the best place to start.
Detached, semi-detached, terraced and flats all have different heat loss profiles
Older properties often have outdated or insufficient insulation compared to modern standards
Even if insulation is in place, it may not be performing to modern standards if it’s old or incorrectly installed
Every home is different. The amount of heat you may be losing depends on your insulation, property type, and layout.
A quick check can help you understand where your property could be losing heat and what solutions may be suitable.
It only takes a minute to understand where your home could be losing heat and what options may be suitable for your property.
A significant amount of heat — often around a quarter — can escape through the roof if insulation isn’t up to modern standards. This figure can vary depending on property type, age, and current insulation quality — but it highlights why roof insulation is one of the most impactful improvements a homeowner can make. Homes with little or no loft insulation can lose considerably more.
Walls account for the largest single source of heat loss in many homes — up to around 35%. Roof heat loss is typically around 25%, while windows, doors, floors, and draughts account for the remainder. The exact split varies by property.
Yes. Loft insulation and cavity wall insulation are relatively straightforward to install in most properties. Draught-proofing is one of the simplest and most affordable improvements. Even small changes to existing insulation can make a meaningful difference to your energy bills and comfort.
Reflective foil insulation works by reducing radiant heat loss. It reflects heat back into a space rather than allowing it to pass through. It can be used alongside traditional insulation or as a standalone solution in certain areas, particularly in lofts and roofs. It is designed to improve overall energy efficiency in the home.
Signs that your insulation may not be performing well include high energy bills, rooms that are difficult to keep warm, cold upstairs bedrooms, and condensation issues. A quick property assessment can help identify where improvements could be made. Use our free comparison tool to get started.
Yes. Various government schemes and energy company obligations provide funding for insulation improvements, particularly for eligible households. Availability depends on your property, income, and current insulation status. We can do a quick eligibility check as part of our free comparison service.