Save up to £485 each year with Effective Cavity Wall Insulation
Save hundreds on your energy bills annually by having your home's cavity walls filled with thermally efficient insulation. You can also benefit from:
- Quick & straightforward installation
- Lifetime effectiveness for annual bill savings
- Higher property values
- Free insulation grants
You could qualify for free cavity wall insulation funding
Want to receive funding to help with the cost of cavity wall insulation? Under various government-backed schemes, including ECO4 and the Great British Insulation (GBIS) scheme, you could be eligible for cavity wall grants that will fully or partially cover the cost of your insulation installation. This funding will help your household reduce its carbon emissions and heating bills.
- Free or subsidised cavity wall insulation
- Reduce heating bills and energy waste
- Easy to apply – we can help
How Effective Home Can Help With Accessing Cavity Wall Insulation ECO Funding
1 Effective Home carry out a check to see if you are eligible for free cavity wall insulation funding
2 We arrange a free home survey to ensure your property meets the criteria
3 An installation date for your home insulation, when it suits you
If you are eligible for funding, your cavity wall insulation could be installed at a fraction of the cost, or even completely free. Get in touch on 0333 003 0703 and we can help, or check if you qualify here.
Our business and its success are built on energy efficiency funding and grants.
How will Effective cavity wall insulation help me?
A cavity wall is made of two separate thin walls. By filling this gap with insulating material, you add an additional layer of heat protection between your internal walls and external walls, meaning the temperature outside won’t affect the temperatures inside your home as easily. The insulating material will stop heat transfer and heat loss, making your home much more comfortable to live in.
Typically mineral wool, polystyrene beads, or polyurethane foam will be used to fill cavity walls. This is because these materials are known for their insulation properties and low thermal conductivity. Insulating materials like these prevent heat transfer and keep heat locked into your home, rather than letting heat escape through your home’s external walls.
Work with Effective Home and our insulation experts will discuss your cavity wall insulation options with you to ensure you get the best results.
Is cavity wall insulation right for my home?
If your house was built in the last 20 years or so, the walls are probably already insulated. If you’re not sure whether a) your walls have cavities, or b) if you have cavity wall insulation already, we can help.
You’ll need to first make sure you have a cavity wall to begin with. If you don’t, then another insulation option will need to be picked out. A cavity wall is made up of an inner wall and outer wall, and the insulation is then installed in the gap between the two layers.
Homes built after the 1920s will typically have cavity walls, and those before will have solid walls. These can still be insulated with internal wall insulation or external wall insulation.
Our installers will be able to tell you which wall type you have and give you a better idea about the insulation method that’s best for you.
You Could Qualify For Free Cavity Wall Insulation Grants
- Funding available under ECO4 and Great British Insulation Scheme (GBIS)
- Free cavity wall insulation (plus other types of insulation, including loft insulation)
- Reduce heating bills and energy waste
- Easy to apply – we can help
The Benefits of Installing Cavity Wall Insulation
Reduced heat loss
Reduced condensation
Simple installation
Increased value of property (EPC)
Effective for lifetime of property
Cost and Savings
A third of all heat loss is through the walls of uninsulated homes.
By properly insulating cavity walls, you will save energy and reduce your energy bills. It’s great for your carbon footprint too with significant carbon dioxide savings resulting from wall cavity insulation.
The Energy Saving Trust estimates that if a typical household were to install cavity wall insulation they would enjoy the following savings:
Energy Bill/ CO2 saving savings table
| Energy bill savings (£/yr) | Carbon dioxide savings (kgCO/yr) | |
| Detached house | £485 | 1100 |
| Semi detached house | £280 | 650 |
| Mid-terrace house | £165 | 380 |
| Detached bungalow | £210 | 485 |
| Mid-floor flat | £135 | 305 |
Figures from Energy Saving Trust based on a gas-heated home having cavity wall insulation installed and fuel prices as of January 2024.
You should be able to make back the cost of cavity wall insulation in around 5 years due to it costing less to heat your home and your cavity insulation is guaranteed to work effectively for 25 years.
Cost of Cavity Wall Insulation
Insulating Your Walls Could
Carbon Footprint Impact
Criteria For Cavity Wall Insulation
Most houses built since the 1990s already have wall insulation, but if your house is older than that, it may not have any.
Your home could be suitable for standard cavity wall insulation if:
- Its external walls are unfilled cavity walls
- Your cavity is at least 50mm wide, and is clear of rubble
- The masonry or brickwork of your property is in good condition
- The outside walls are not exposed to driving rain
- Your house is not at risk of flooding
One of our installers will carry out a survey to check that your house is suitable for cavity wall insulation before going ahead. This service is free of charge with no obligation.
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Cavity Wall FAQs
How is cavity wall insulation installed inside the wall?
Most cavity walls can be insulated by injecting insulation material into the cavity from the outside. Your installer will drill small 22mm drill holes at intervals in your outer walls, inject insulation through the holes using specialist equipment, and then seal them with cement.
The insulation materials are usually either mineral wool or polystyrene beads.
Once all the insulation is in, we’ll fill the holes in the brickwork so you’ll barely notice them.
How long does it take to insulate cavity walls?
Filling cavity walls is not a job you can do yourself, you will need to employ an approved installer that uses the right certified products. Effective Home can usually do the job in around two hours for an average house with easily accessible cavity walls.
It shouldn’t make any mess, and the only noticeable signs that you have had cavity wall insulation installed will be the very small evenly placed holes on the outer wall.
Does old cavity wall insulation need to be removed?
In some instances, a property may have already had its cavity walls insulated, but this may have been done some time ago and the lifespan of the cavity barrier may have elapsed, or it may be poorly installed in the first place, meaning that it needs replacing.
Old or damaged insulation can affect energy efficiency and therefore energy bills, and also potentially impact health if the end result is issues with mould or similar.
If you suspect your cavity wall insulation has failed then it will need to be assessed before being removed. There are several methods to remove cavity wall insulation, but the most common involves the use of high-pressure air to dislodge and break up old insulation, which is then carefully caught and removed.
Only when the old insulation and any issues that may have caused it to fail have been remedied, can the new cavity wall insulation be installed.
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What is the Cavity Insulation Guarantee Agency (CIGA)?
The Cavity Insulation Guarantee Agency (CIGA) is an insurance guarantee agency designed to offer support and protection and 25-year guarantees to consumers when their installer is registered with them.
Effective Home is NOT registered with CIGA. Instead, we’re registered with both HIES and QualityMark Protection which offers similar protections (25-year guarantee) for you as a customer when getting cavity wall insulation from a registered installer like Effective Home.
Both schemes protect you and ensure that our work is completed to the highest standards so you can be confident in the insulation we install.
Can cavity wall insulation cause damp?
You may have seen rumours that cavity wall insulation can cause damp patches in your home, but this isn’t strictly true. Whilst plenty of builders argue that cavity walls should be left empty to allow the property to breathe, if you choose the right insulation material then your walls will still be able to breathe.
With a top-quality installer, you won’t need to worry about damp problems, because damp prevention will be at the forefront of their minds like it is for us at Effective Home. That way, you can keep all the heat inside your home, and all the damp out.
Of course, in order for the insulation to be effective, you’ll need to ensure that there are no issues with the construction of the walls that might allow damp bridging to occur.
But in terms of cavity insulation being the cause of any damp issues, the chances are incredibly slim.
How much will cavity wall insulation cost me?
To install cavity insulation in your home, you can expect to pay anywhere between £300 and £2500+. But why is there such a discrepancy in those prices?
Your final bill will be based on how much of your home you’re insulating, the size of your property, your property type (a detached house will cost far more than a mid-floor flat, for example), and the material that’s being used.
For an individualised quote, contact Effective Home today, and after gathering some details our friendly customer service team will be able to provide you with a competitive quote based on your needs.