A guide to the importance of home insulation in homes in the UK

Here’s some information about why home insulation is so important in the UK. We answer some of your common questions here too. 

How does insulation work?

Home insulation works by trapping air within its material, reducing the rate at which heat flows out of the house in winter and into the house in summer. This process helps maintain a consistent temperature indoors, making it crucial for energy efficiency.

Good insulation reduces the need for heating and cooling systems to work as hard, thereby lowering energy bills and minimising environmental impact.

Home Insulation – true or false

There are some common misconceptions relating to insulation. We address some of these below and more in our FAQs. 

You can't insulate an old home - FALSE

As long as your new insulation is installed correctly and prepared for breathability, it is perfectly fine and efficient to insulate old homes. 

Insulation requires a lot of upheaval - TRUE

The majority of insulation, especially in older properties, does require some upheaval. This can include re-plastering, rendering or removing and refitting flooring. 

Insulation always causes damp - FALSE

When installed by professionals with the correct preparation, insulation won’t cause damp. It’s important to retain air flow (using methods such as air bricks) alongside your insulation. 

Different insulation types

There are a range of different insulation types for your home, and most homes are suitable for more than one type. 

Loft insulation – about 25% of heat is lost through the roof, loft insulation can reduce this. 

Internal & external wall insulation – rigid foam boards installed in the internal walls can be installed or external cladding can be applied. About 35% of heat escapes through your walls.

Underfloor insulation – it is estimated that 15% of heat is lost through the floor of your property. There are under floor insulation methods available for both suspended floors and solid floors. 

Cavity wall insulation – to prevent about a third of your property heat loss, you can insulate your cavity walls. Make sure this is completed by an insured and experienced professional. 

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Home Insulation FAQs

  • I don't have a cavity walls, so how can you insulate my walls?

    Just because you have solid walls, doesn’t mean they can’t be insulated. Cavity wall insulation isn’t the only type of wall insulation available. There are a range of other internal and external wall insulation methods available to households with solid walls.

  • Will the insulation be disruptive?

    There are several different insulation options. Some of these are disruptive to your home, whilst others aren’t. For example, loft insulation will provide little disruption to most homes as installers will just be laying roll or foam boards in your loft out of sight. However, things like internal wall insulation can be disruptive and will involve walls being replastered.

  • Will internal wall insulation reduce the size of my room?

    Internal room insulation involves foam insulation boards being installed on the internal wall of your home on purpose-built wooden beams. These boards will then be covered and plastered. You will lose about 10cm of room space from each wall. Wall insulation is one of the most important methods of insulation to reduce heat loss.

  • I already have loft insulation, does my house still need to be insulated more?

    Great news! Loft insulation is a great start to insulating your home. However, it is important to insulate walls and floors to prevent additional heat loss. About 25% of heat is lost through the loft, but more can escape from other areas of your home.

  • Are there any cheap ways to insulate my home?

    There are a range of ways you can insulate your home yourself without having to pay for extensive works. This can be done with simple draught excluders underneath internal and external doors, fitting your carpets with underlay, or using thicker curtains on all windows.

  • What will external wall insulation involve?

    External wall insulation will involve special insulation cladding being attached to the external wall of your property. This cladding is then rendered to provide a good finish.