How will cavity wall insulation help me?
Heat will escape more quickly from an uninsulated home. In winter, the colder it is outside, the faster heat from your home will escape. Most homes built after the 1990s have wall insulation, but if your home is older than that it may not have it.
Cavity Wall Insulation
• Saves on your heating bills
• Keeps your home cosier in the winter, cooler in the summer
• Improves comfort for you and your family
• Helps to reduce your carbon footprint
The Energy Savings Trust (EST) estimates that insulating a detached home with cavity walls could save up to £485 per year in heating bills just from insulating the walls.
How to tell if you have cavity walls
The majority of homes built during and after the mid1920s will have an external cavity wall. This cavity is the space that is insulated, using either a mineral fibre or a polystyrene bead, which helps to keep the heat in and reduce your heating bills.
You can tell if your home has a cavity wall by measuring the wall width around the windows or doors. If this is more than 250mm (10 inches) then your home probably has a cavity. You may also be able to tell by looking at the brick pattern on your home: if your home has cavity walls, the bricks will all look the same size; if every other brick is placed end-on, then your home probably has solid walls.
You may be able to tell if your home already has cavity wall insulation if circular drill pattern holes are visible in the mortar joints. If you aren’t sure, then our assessor will be able to confirm when they visit.
Installation
Before installation, one of our retrofit surveyors will carry out a free inspection of your property to assess that it is suitable. Once it has been assessed, the Installation Assurance Authority (IAA) will complete an independent inspection to confirm suitability for your protection. This process has been designed to confirm if the cavity insulation measures are right for your home.
To install cavity wall insulation a series of holes between 22 and 26mm are drilled in the mortar joints of the walls. The insulation material is then injected into the cavity through these holes. All the holes are filled after installation, resealing the cavity and matching the colour as closely as possible.
Cavity wall insulation will take between 2 and 4 hours depending on the size of your home.
If you have a semi-detached or terraced home, we install a barrier at the party wall line preventing the insulation crossing into the neighbouring homes.
Cavity wall insulation has a 25-year guarantee for your peace of mind, backed by the IAA.
Cavity wall insulation does not cause damp or mould when installed correctly, but it can worsen pre-existing problems if they are not remedied before installing insulation.
To reduce the risk of damp in your home, it is important to maintain exterior brickwork and mortar, rainwater fittings, rooflines and damp-proof course. Our assessor will complete several checks at your home to ensure that there are no existing issues and that your home is suitable for cavity wall insulation.
Grant Funding
You may be able to access grant funding to support your cavity wall insulation. Not all grant funding is means tested. Our team will always check to see if you can access grant funding.
You can also benefit from 0% VAT, which is available until 2027 on insulation installations and renewable energy upgrades.
Aran can access a number of grant funding schemes including Great British Insulation Scheme (GBIS) and Energy Company Obligation (ECO)4 (ECO4).
More information about grant funding is available here: