How a lot does cavity wall insulation price in 2023?

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The costs on this information are correct, as of 2023

Picture of a wall with cavity wall insulation being installled
How a lot does cavity wall insulation price in 2023? 9

Should you’re trying to make your private home as vitality environment friendly as attainable, among the best issues you are able to do is correctly insulate the partitions of your private home. 

Cavity wall insulation can cease warmth from escaping by way of your partitions, which in flip can cut back your vitality payments significantly. That is completed by drilling holes into your cavity wall, after which injecting insulation inside. 

One of these insulation solely works in case you have cavity partitions although. Extra fashionable houses are likely to have strong partitions or include partitions which have already been fitted with insulation. If your private home was constructed between the Nineteen Twenties and the Eighties, there’s a good probability you will have cavity partitions. One other signal of cavity partitions is uniform, lengthways fitted brickwork (alternating lengthy and brief facet positioned bricks are an indication of no cavity). 

You may have a survey carried out in your partitions to verify cavity wall insulation can be appropriate. Should you’re eligible, then including insulation might assist considerably cut back each your heating payments and your carbon footprint. It should additionally make your private home hotter. 

To not point out that cavity wall insulation is likely one of the high eco house enhancements, including a median of £11,764 to the worth of your property. 

You may spend anyplace from £650 and £6,100 to get cavity wall insulation.  

Costs embrace labour and supplies. Remember the fact that the price of labour rises in London and the South East, generally by as a lot as 20% extra, on common. 

What insulation is finest for cavity partitions?

Picture of insulation beads for a cavity wall
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There are a number of strategies of inserting insulation into cavity partitions. Should you aren’t positive which might be finest for you, tell us what you’re pondering and the dimensions and age of your private home, and get some free quotes at this time. We advocate you ask for a number of quotes earlier than you choose a tradesperson.


Kind of cavity wall insulation   What’s it?  Professionals  Cons 
Increasing polystyrene granules or beads (EPS)  Beads or granules of polystyrene which might be inserted into the cavity.  Eco-friendly and recyclable
Damp resistant
Straightforward to put in 

Sturdy and light-weight 

Water-proof (prevents damp) 

Not good at insulating sound 

It’s worthwhile to clear the cavity earlier than set up 

May cause gaps in your cavity 

Polyurethane foam (PIR)  A kind of spray foam that expands because it units.  Extremely environment friendly at insulating
Straightforward to put in
Gained’t trigger mould 
Not environmentally pleasant and may’t be recycled
Dearer than different choices
Materials shrinks over time 
Cavity wall boards  Insulation boards which might be fitted while the home is being constructed.  Are available a variety of sizes and various kinds of supplies
An reasonably priced possibility
Hearth resistant and often waterproof 
Arduous to retrofit, so extra fitted to new builds
Much less good at insulating than different choices 
Wool fibre   Insulation constructed from sheep wool. Often is available in rolls, like a blanket, or as unfastened fibre.  Straightforward to put in
Eco-friendly, renewable, and sustainable
Hearth resistant
Good at defending from moisture / damp + mould growth 
Dearer than different choices
Much less thermal environment friendly than different choices
Must be handled with chemical compounds to guard it from bugs 
Mineral fibre  Mineral fibres are molten rock that has been sure collectively and changed into sheets or unfastened fibres.  Proof against rot
Will be blown into the cavity, which makes it straightforward to put in
Low cost to put in
Environmentally pleasant 
Cavity should be clear and spacious
Liable to clumping, which may trigger damp
Restore is dear  
Forms of cavity wall insulation 

Most fashionable cavity wall insulations ought to final you as much as 25 years. 

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How a lot does cavity wall insulation price?

Picture of a tradesperson installing cavity wall insulation from the outside of a home
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How a lot you pay to your new cavity wall insulation will rely upon the kind of property you will have, and its measurement. The larger your private home, the costlier the whole price will likely be. Costs can even rise in case you have a really outdated property, as extra remedial work could also be wanted. Damp additionally complicates issues, as it is going to should be handled earlier than the insulation is put in.

To get a extra correct sense of how a lot your mission will price you, inform us what you’re on the lookout for, and get some free quotes at this time.


Kind of house  Common price 50m2 Common price 100m2 Common price 160m2
Semi-detached or indifferent house  £1,150 – £2,500 £1,600 – £3,200 £,2,300 – £6,100
Flat   £650 – £1,800 £1,200 – £1,900 £2,000 – £5,000
Terraced house  £700 – £2,000 £1,300 – £2,000 £2,200 £4,800
Bungalow   £750 – £2,200 £1,400 – £3,800 £2,400 – £5,500
Common price of cavity wall insulation, in keeping with property kind and measurement

How a lot you find yourself spending can even be decided by the kind of cavity wall insulation you get. For instance, mineral fibre insulation for 50m2 would price roughly £717, while 100mm PIR cavity boards for a similar space would price about £1,911. Equally, you can pay £2,296 for mineral fibre on 160m2 or £6,116 for PIR boards. These costs will fluctuate relying on the place you reside within the UK. How troublesome your cavity partitions are to entry may also have an effect on prices. 

It takes between 1 and 4 hours to totally insulate cavity partitions, relying on the kind of property you will have, and the way large it’s.

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Are you able to do cavity wall insulation your self?

Picture of a handyman insulating a wall cavity
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We don’t advocate you try and insulate your cavity partitions your self, as you have to a registered skilled to finish the job. 

It is because the set up includes a troublesome, technical process utilizing hazardous merchandise that should be dealt with with care. Incorrectly put in insulation may cause damp or can result in a much less energy-efficient cavity wall too. 

As an alternative, rent a talented tradesperson to do the job for you.


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Are you able to get free cavity wall insulation? 

Underneath the Vitality Firm Obligation (ECO), a authorities vitality scheme in Britain that seeks to sort out gas poverty and cut back carbon emissions, a choice of British owners are eligible for a grant to assist pay for the set up of insulation. 

You’re eligible for this scheme if you happen to declare certainly one of these advantages (and in addition meet the earnings necessities): 

  • Little one Profit 
  • Pension Assure Credit score 
  • Earnings-related Employment and Help Allowance (ESA) 
  • Earnings-based Jobseeker’s Allowance (JSA) 
  • Earnings Help 
  • Tax Credit (Little one Tax Credit and Working Tax Credit) 
  • Common Credit score 
  • Housing profit 
  • Pension credit score saving credit score 

It’s essential to personal your personal home or have your landlord’s permission to profit from ECO. You may entry extra recommendation on vitality saving schemes right here. 

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How a lot vitality does cavity wall insulation save? 

Picture of a person calculating heat loss of home with a calculator
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The advantage of cavity insulation is that inside only a few years it is going to pay you again for the upfront set up prices, by saving you cash in your vitality payments. 

It is because insulation may also help entice as much as a 3rd of your private home’s warmth which might in any other case escape by way of your partitions. 

The beneath costs discuss with the typical UK house owner’s annual vitality invoice financial savings, on account of having put in cavity wall insulation. 

  Indifferent house  Semi-detached house   Flat  Mid-terraced house  Bungalow  
Yearly vitality invoice financial savings    £480   £285   £145   £180   £195 
How a lot cavity wall insulation might prevent in vitality payments, yearly, in keeping with the Vitality Saving Belief 

In addition to this, relying on the kind of property you will have, you can save between 335 – 1100 kg of CO2 a yr by inserting cavity wall insulation, serving to to considerably cut back your carbon footprint. 

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How a lot does it price to have cavity wall insulation eliminated? 

Picture of tradespeople removing cavity wall insulation
How a lot does cavity wall insulation price in 2023? 14

There are a number of the explanation why you would possibly wish to eliminate the present insulation in your cavity partitions. This course of is accomplished both by sucking out the insulation utilizing a vacuum or breaking apart the insulation into smaller items utilizing a specialist machine. 

You would possibly wish to have your cavity wall insulation eliminated if: 

  1. Older insulation strategies are probably poisonous and will have carcinogenic well being implications. 
  1. Sometimes, DIY or unprofessional installers set up insulation that’s not appropriate for the property (as an illustration in timber framed properties). Equally, poorly put in insulation with gaps in it may possibly result in dampness. In case your insulation develops damp, it is going to should be eliminated. All the time be sure you rent skilled installers. You are able to do so right here.


  1. If your private home suffers from a flood or fireplace, this might trigger harm to your insulation, which can want changing. 

How a lot you spend on eradicating your cavity wall insulation will rely upon the scope of the mission. You may count on to pay roughly between £20 – £22 per m2 for cavity wall insulation removing. For a complete home, that might look anyplace between £1,600 – £2,600. 

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What are the constructing laws for cavity partitions? 

All cavity wall insulation requires a constructing discover submitted to a constructing management physique. 

Constructing laws are required to make sure that your chosen insulation materials is appropriate to your property. 

Most native authorities is not going to levy a constructing management cost. For extra info, entry the Planning Portal web site. 

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What’s the U worth of cavity wall insulation? 

The U worth, often known as thermal transmittance, measures the speed of warmth lack of a cloth. 

The equation for the U worth appears like this: 

Picture of cavity wall insulation equation
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R represents thermal resistance (of your cavity wall insulation). The U worth is measured in Watts-Per-Metre-Sq.-Kelvin (W/m2K). 

Constructing laws will test your U worth to verify your insulation complies with the required quantity. The decrease your worth, the higher. Constructing laws require your cavity partitions to be a minimum of 0.18 (W/m2K). 

A talented tradesperson will be certain that your insulation conforms to all constructing laws. You may rent an insulator right here.


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Picture of the outside of a home having cavity wall insulation installed to an extension
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Cavity wall insulation is likely one of the only methods to cease warmth escaping from your private home, decreasing your vitality payments and carbon footprint. It’s no shock that it’s presently a high eco house enchancment, as correctly insulated partitions can add over £11,000 to the worth of your private home. 

Your insulator will have the ability to advise you on what kind of insulation it’s best to get, in keeping with the age and structure of your private home. How a lot you find yourself spending will largely rely upon the dimensions of your property. 

For a extra correct quote on the whole price of including cavity wall insulation to your private home, tell us what you’re pondering, and get some free quotes at this time.


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