{"id":43570,"date":"2023-03-01T16:43:17","date_gmt":"2023-03-01T16:43:17","guid":{"rendered":"https:\/\/www.ratedpeople.com\/blog\/?p=43570"},"modified":"2026-04-16T13:00:42","modified_gmt":"2026-04-16T12:00:42","slug":"how-much-does-cavity-wall-insulation-cost","status":"publish","type":"post","link":"https:\/\/www.ratedpeople.com\/blog\/how-much-does-cavity-wall-insulation-cost","title":{"rendered":"How much does cavity wall insulation cost in 2026?"},"content":{"rendered":"\n

The prices in this guide are accurate, as of 2026*<\/em><\/p>\n\n\n\n

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Cost of cavity wall insulation on different properties <\/figcaption><\/figure>\n\n\n\n

If you\u2019re looking to make your home as energy efficient as possible, one of the best things you can do is properly insulate the walls of your home. <\/p>\n\n\n\n

Cavity wall insulation can stop heat from escaping through your walls, which in turn can reduce your energy bills considerably. This is done by drilling holes into your cavity wall, and then injecting insulation inside. <\/p>\n\n\n\n

This type of insulation only works if you have cavity walls though. More modern homes tend to have solid walls or come with walls that have already been fitted with insulation. If your home was built between the 1920s and the 1980s, there is a good chance you have cavity walls. Another sign of cavity walls is uniform, lengthways fitted brickwork (alternating long and short side placed bricks are a sign of no cavity). <\/p>\n\n\n\n

You can have a survey carried out on your walls to make sure cavity wall insulation would be suitable. If you\u2019re eligible, then adding insulation could help significantly reduce both your heating bills and your carbon footprint. It will also make your home warmer. <\/p>\n\n\n\n

Not to mention that cavity wall insulation is one of the top eco home improvements<\/a>, adding an average of \u00a311,764<\/strong> to the value of your property. <\/p>\n\n\n\n

You could spend anywhere from \u00a3650 <\/strong>and \u00a36,100 <\/strong>to get cavity wall insulation. Prices include labour and <\/strong>materials. Keep in mind that the cost of labour rises in London and the South East, sometimes by as much as 20% more, on average. Find an insulation specialist<\/a> in your area to get a more accurate quote on how much you might spend on cavity wall insulation.<\/p>\n\n\n\n

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What insulation is best for cavity walls?<\/strong><\/h3>\n\n\n
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There are several methods of inserting insulation into cavity walls. If you aren\u2019t sure which would be best for you, let us know what you\u2019re thinking and the size and age of your home, and get some free quotes today. We recommend you ask for a few quotes before you settle on a tradesperson.<\/p>\n\n\n

FIND A LOCAL CAVITY WALL INSULATION SPECIALIST<\/font><\/a><\/center><\/p>\n\n\n
Type of cavity wall insulation\u202f<\/strong> <\/td>What is it?<\/strong> <\/td>Pros<\/strong> <\/td>Cons<\/strong> <\/td><\/tr>
Expanding polystyrene granules or beads (EPS) <\/td>Beads or granules of polystyrene that are inserted into the cavity. <\/td>Eco-friendly and recyclable
\u202f 
Damp resistant
\u202f 
Easy to install 

Durable and lightweight 

Water resistant (prevents damp) <\/td>		Not good at insulating sound 

You need to clean the cavity before installation 

Can cause gaps in your cavity <\/td><\/tr>
Polyurethane foam (PIR) <\/td>A type of spray foam that expands as it sets. <\/td>Incredibly efficient at insulating
\u202f 
Easy to install
 
Won\u2019t cause mould <\/td>		Not environmentally friendly and can\u2019t be recycled
\u202f 
More expensive than other options
 
Material shrinks over time <\/td><\/tr>
Cavity wall boards <\/td>Insulation boards that are fitted whilst the house is being built. <\/td>Come in a range of sizes and different types of materials
\u202f 
An affordable option
 
Fire resistant and usually water resistant <\/td>		Hard to retrofit, so more suited for new builds
 
Less good at insulating than other options <\/td><\/tr>
Wool fibre\u202f <\/td>Insulation made from sheep wool. Usually comes in rolls, like a blanket, or as loose fibre. <\/td>Easy to install
 
Eco-friendly, renewable, and sustainable
 
Fire resistant
 
Soundproof
\u202f 
Good at protecting from moisture \/ damp + mould development <\/td>		More expensive than other options
\u202f 
Less thermal efficient than other options
 
Needs to be treated with chemicals to protect it from insects <\/td><\/tr>
Mineral fibre <\/td>Mineral fibres are molten rock that has been bound together and turned into sheets or loose fibres. <\/td>Resistant to rot
\u202f 
Can be blown into the cavity, which makes it easy to install
 
Cheap to install
 
Environmentally friendly <\/td>		Cavity must be clean and spacious
 
Prone to clumping, which can cause damp
 
Repair is expensive\u202f <\/td><\/tr><\/tbody><\/table>
Types of cavity wall insulation<\/em> <\/figcaption><\/figure>\n\n\n

Most modern cavity wall insulations should last you up to 25 years. <\/p>\n\n\n

As well as cavity wall insulation, you should also consider getting loft insulation installed, as it is also a great way to cut your energy bills. Check out our loft insulation cost guide<\/a> to find out more on how you can make your home even more energy efficient.<\/p>\n\n\n\n\n\n\n\n\n

How much does cavity wall insulation cost? <\/strong><\/h2>\n\n\n
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How much you pay for your new cavity wall insulation will depend on the type of property you have, and its size. The bigger your home, the more expensive the total cost will be. Prices will also rise if you have a very old property, as additional remedial work may be needed. Damp also complicates things, as it will need to be dealt with before the insulation is installed. <\/p>\n\n\n

To get a more accurate sense of how much your project will cost you, tell us what you\u2019re looking for, and get some free quotes today.<\/p>\n\n\n

FIND A LOCAL CAVITY WALL INSULATION SPECIALIST<\/font><\/a><\/center><\/p>\n\n\n
Type of home<\/strong> <\/td>Average cost 50m2<\/strong><\/td>Average cost 100m2<\/strong><\/td>Average cost 160m2<\/strong><\/td><\/tr>
Semi-detached or detached home <\/td>\u00a31,150 – \u00a32,500<\/strong><\/td>\u00a31,600 – \u00a33,200<\/strong><\/td>\u00a3,2,300 – \u00a36,100<\/strong><\/td><\/tr>
Flat\u202f <\/td>\u00a3650 – \u00a31,800<\/strong><\/td>\u00a31,200 – \u00a31,900<\/strong><\/td>\u00a32,000 – \u00a35,000<\/strong><\/td><\/tr>
Terraced home <\/td>\u00a3700 – \u00a32,000<\/strong><\/td>\u00a31,300 – \u00a32,000<\/strong><\/td>\u00a32,200 \u00a34,800<\/strong><\/td><\/tr>
Bungalow\u202f <\/td>\u00a31,100 – \u00a32,400<\/strong><\/td>\u00a31,500 – \u00a33,300<\/strong><\/td>\u00a32,200 – \u00a35,800<\/strong><\/td><\/tr><\/tbody><\/table>
Average cost of cavity wall insulation, according to property type<\/em> and size<\/em><\/figcaption><\/figure>\n\n\n

How much you end up spending will also be determined by the type of cavity wall insulation you get. For example, mineral fibre insulation for 50m2<\/sup> would cost roughly \u00a3717<\/strong>, whilst 100mm PIR cavity boards for the same area would cost about \u00a31,911<\/strong>. Similarly, you could pay \u00a32,296 <\/strong>for mineral fibre on 160m2<\/sup> or \u00a36,116 <\/strong>for PIR boards. These prices will fluctuate depending on where you live in the UK. How difficult your cavity walls are to access can also affect costs. <\/p>\n\n\n

It takes between 1 and 4 hours to fully insulate cavity walls, depending on the type of property you have, and how big it is.<\/p>\n\n\n\n\n\n\n\n\n

Can you do cavity wall insulation yourself?<\/strong><\/h3>\n\n\n
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We do not recommend you attempt to insulate your cavity walls yourself, as you will need a registered professional to complete the job. <\/p>\n\n\n

This is because the installation involves a difficult, technical procedure using hazardous products that need to be handled with care. Incorrectly installed insulation can cause damp or can lead to a less energy-efficient cavity wall too. <\/p>\n\n\n

Instead, hire a skilled tradesperson to do the job for you.<\/p>\n\n\n

FIND A LOCAL CAVITY WALL INSULATION SPECIALIST<\/font><\/a><\/center><\/p>\n\n\n\n\n\n\n\n\n

Can you get free cavity wall insulation? <\/strong><\/h3>\n\n\n
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Under the Energy Company Obligation<\/a> (ECO), a government energy scheme in Britain that seeks to tackle fuel poverty and reduce carbon emissions, a selection of British homeowners are eligible for a grant to help pay for the installation of insulation. <\/p>\n\n\n

You are eligible for this scheme if you claim one of these benefits (and also meet the income requirements): <\/p>\n\n\n