Insulation saves energy
Insulation saves energy
Home -Energy Sectors - Domestic

Insulation saves energy

Insulating your home helps to reduce your energy bills and ensure a more comfortable living environment for you and your family.

Many homes built before the 1990’s have either inadequate, or no insulation within their roof spaces or walls. Research shows that around 40% of heat loss is through walls and roofs, which is why proper and adequate insulation is becoming increasingly more important.

“Loft insulation is a relatively inexpensive way of making your home warm and cosy”

Walls are a key factor for heat loss, sometimes allowing around 30% of your homes heat to escape. With modern technology and insulation systems, walls can be effectively insulated to help significantly reduce this figure.

When insulating your walls, you must first of all determine whether your home has a cavity wall or a solid wall.


Solid Walls often require a cladding system to be applied either externally or internally to the home. Click here to find out more about insulating solid walls.

Cavity Wall insulation is a common and popular way of insulating your home. This involves drilling discreet holes in the property walls and filling the cavity with mineral wool or insulating beads. Click here to find out more about cavity wall insulation.

Loft insulation is a quick and relatively inexpensive way of keeping your home warm and cosy for a relatively low cost.

Our insulation is a high performance product that is often more effective in thermal insulation than many off-the-shelf DIY products. Click here to find out more about loft insulation.


Cavity wall insulation

Most modern day homes now have cavity walls, which means that there are two layers of brickwork with a small gap in between them. This is common of houses built anytime from 1920 onwards, and if you do have a cavity, it’s very easy to improve your home’s insulation through the installation of cavity wall insulation.

Insulating your homes cavity with either beads, foam or wool can help to reduce your heat loss by up to 1/3rd, and is very inexpensive to install. Typical costs are range from around £100 upwards, and can save over that in the first year of installation.

“If your home was built after 1920, it’s very likely to have a cavity wall”

Is my home suitable?

If your home was build after the 1920’s, it’s very likely that you will have a cavity wall. This means, that providing you have a 50mm cavity within your wall, you will be able to have insulation fitted.

Some other considerations are also shown below.

Are there any signs of damp?

Before installation of cavity wall insulation, it’s important to ensure there are no areas of damp in the walls. If this is the case, the problem will need to be rectified before proceeding.

Are your walls exposed to driving rain?

If your home is exposed to excessive driving rain, it may not be suitable to install cavity wall insulation, as this may cause issues with damp in the long term.

Property access

Access to the entire building is required, as the insulation is installed by drilling small holes in the mortar 1 meter away from each other, and then injecting the insulation into the cavity. We therefore need to ensure no obstructions exist.

Neighbouring walls

If you have neighbors homes attached to your property, we will simply install what’s known as a cavity barrier to prevent the insulation from going into their wall.

Newer homes

For homes that were built within the last ten years, it is likely that you house already has cavity wall insulation installed. If you are unsure, an easy test is to drill a small hole through into the cavity, to determine if insulation exists.


Solid wall insulation

Solid walls, often made from brick or stone are known for being much more inefficient than cavity walls. On average, these types of walls allow double the amount of heat to escape than an un-insulated cavity wall.

To help to insulate this type of wall, insulation must be fitted either internally or externally to the wall. Internal installations are often more cost effective, whilst external installations help to maintain the same floor space to your property, and minimize disruption inside your home.

For most installations, planning permission is not required, especially for internal insulation works. For external works, planning permission may be required if you live in a place of natural beauty, national parks or in a listed property.

Summary costs and benefits.

Internal Insulation External Insulation
Cost of installation £5,000 – £8,500 £9,400 – £13,000
Yearly savings (average) £445.00 £475.00
Carbon Savings 1.8 tonnes per year 1.9 tonnes per year

Internal Wall Insulation

Internal wall insulation is the most disruptive method, and involves removing existing skirting boards, architrave and windowsills. These are replaced once the work is completed.

Internal wall insulation can be carried out one of two ways

Insulation Boards

Insulation boards are usually large sheets of insulating material, which are up to 100mm thick and are bonded directly onto internal walls. These have a plasterboard-like look, and joints are made good and sealed to create a seamless overall finish.

Stud Partition Insulation

Stud partitions consist of wooden uprights and cross beams which are fitted and packed with mineral wool insulation. Once the wall has been build and insulated, the face can be covered with plasterboard ready for the finishing touches. For additional insulation, an extra layer of sheet insulation could also be fitted before fixing plasterboard to provide even better insulation for your property.

Diagram showing external wall insulation, Energy Gain UK

External Wall Insulation

External wall insulation is fitted to the exterior of the building and provides a water resistant, well insulated additional layer which can then be finished in a number of effects such as painted, brick effect or stone chip effect.

External wall installations help to protect your existing brickwork from the elements, further preventing penetrating damp to your property, and improving the environment within the home.

Whilst this method is more costly than internal insulation, it does have its benefits. Firstly, it reduces the heat loss of your home significantly, whilst not removing any of the floor space from within your home. The cost of this installation is often not significantly more than work such as re-rendering, re-pointing and replacing bricks, so can often be a viable alternative when this work needs carrying out.

Special discounts can also be provided for those already having solar panels installed on their home, as the cost of scaffold can be split across the two projects.

Loft insulation

Insulating your loft helps to keep warm air in your home, which keeps your living space more comfortable whilst reducing your heating bills. As insulating your loft is a relatively low cost method, it is often a good first port of call for many home owners.

According to advice from the Energy Saving Trust, the ideal amount of loft installation for modern homes is 270mm. They stated that that if all homeowners in the UK were to insulate their lofts with 270mm of insulation, the UK would save around £500 million per year, and a massive 2.7 million tonnes of carbon dioxide too. This is the equivalent of taking around 100,000 cars off the road.

“Insulating your loft is a relatively low-cost way of preserving heat and saving energy”

If your loft space is already damp, it may not be wise to increase the amount of insulation in your property until the problem has been addressed and rectified. The reason for this is that insulating your loft keeps warm air within the home, making the loft colder. This can therefore cause more damp in certain cases.

Our team of professional and experienced surveyors always carry out an inspection before work begins, so will advise you of any potential problems if they exist.

Types of insulation

For most homes which have even, and well spaced out joists, we recommend the installation of low-density glass mineral wool insulation, which is installed in two parts. Firstly, a 100mm layer is placed between the ceiling joists to create a snug fit throughout. This is then covered at right angles with thicker, 170mm insulation.

For homes that have irregularly spaced joists or oddly shaped loft spaces,loose-fill insulation is also recommended. This can therefore ensure the loft is insulated to the required standards, without the process being too labour-intensive.

Using your loft for storage

The typical installations of loft insulation would normally render your loft space unusable for storage or living space. If however, you would like to use your loft for storage, a rigid insulating board can be laid over the top of your existing 100mm insulation and joists, which can then be overlaid with wooden loft flooring.

For those thinking of converting their loft into a habitable space, insulation board can be used between the rafters instead.