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Estimated Cost Of Cavity Wall Insulation

Are you considering installing insulation for cavity walls on your property?

In the cost guide below will examine the costs for wall insulation. We’ll also delve into the cost of labor and supplies as well as other topics like how long it takes to fill a cavity wall with insulation.


What is the cost of Cavity Wall Insulation?

How much will the cost of cavity wall insulation with no scaffolding?

Without scaffolding, the typical cost of insulation for cavities walls in a middle floor flat could be around £250-£330.

What amount do you need to set aside for the spending plan?

You’ll need to put aside the sum of £400-£495 to get the same project completed in a semi-detached or detached house, £650 to £850 in a detached home or the £275-£320 range for a terraced home. If scaffolding is employed for the construction, it will add around £100  in addition to these expenses.

What factors can impact the total costs?

There’s a myriad of cost-related factors that affect the amount you’ll have to pay to have your cavity walls that are insulated.

They include the quantity of tradespeople who are employed as well as the ease of access to the type of insulation utilized as well as the property’s size and type, the condition of the work site as well as the location of the property owned by the homeowner.

In the final aspect The reason the place you live in matters is because cost of labor varies across the country.

It is because contractors face different costs of living to pay in different areas of the nation.

Rates of employment are generally more expensive across the Southeast (especially London) but lower than those of UK average in northern England, Northern Ireland, and Scotland.

Cavity Wall Insulation Prices

The table below outlines the typical costs for wall insulation:

ScaffoldingSupply Cost
No ScaffoldingMid-floor Flat£250 to £330
Semi-detached House£400 to £495
Detached Property£650 to £850
Terraced House£275 to £320
Scaffolding UsedSemi-detached House£500 to £595
Detached Property£750 to £950
Terraced House£375 to £420

What are the costs of insulating an Cavity Wall?

In this article we’ll look at the costs of materials involved in the insulation of cavity walls within an apartment. This does not include the labour costs for wall insulation prices.

The average supply costs of insulating cavity walls without the use of scaffolding is £200 to £300 for a mid-floor flat, £300 to £400 for a semi-detached house, £500 to £600 for a detached house, and £175 to £225 for a terraced house or bungalow.

Cost of Supply for Installing Cavity Wall Insulation

Mid-rise apartments£200 – £300
Semi-detached House£300 – £400
Detached Property£500 to £600
Terraced House£175 to £225

What are the additional costs for Cavity Wall Insulation?

The additional costs associated with cavity wall insulation are the amount of tradespeople employed and the cost of mileage over and other expenses, if necessary. Let’s review of some possible extra expenses.

Minimum Fee

In the beginning there is the minimum cost on your bill for having cavities that are insulated. This could be a predetermined amount. However it could be in the form of a cost that is increased for the reason of.

If, for instance, you were to pay per day of labor and the task requires four and eight, then you’d have to pay for a full day’s work regardless. So, you’ll pay minimum of one day’s labor cost for every working day that is started.

The size and type of property

The bigger the home the larger it is, the higher it is possible for cavity wall insulation costs. The kind of property you own is also important in addition to its relation to scale but also due to the fact that certain properties may have different constructions and forms that can make the task less or more complicated.

Type of Insulation

Another important aspect is the kind of insulation that is used. The three main types that wall cavities are that are used within the UK are polystyrene beads/granules blow-blown mineral fibre, and Urea formaldehyde foam.

The number of tradespeople

Another factor to consider is the amount of tradespeople employed. More cavity wall installers you employ and the more expensive the labour price will be, and in reverse.

Naturally, the extent to which or not this will be an additional expense all-in-all is contingent on various aspects like how well workers cooperate, since the more people involved in the job, the faster it will be.


Naturally, the longer the time that insulation works and the longer it lasts, the greater the labour costs will be. However, this may not be the case in the case of, say when the costs for labour are billed as a fixed amount.

Costs of tradesmen to Insulate Cavity Walls

In this article we’ll look at the labour costs that are associated with the insulation of cavity walls. This is a way of excluding costs of the supply. We’ll also consider the variables that affect and affect the labor costs in the case of insulation for cavities.

The cost of labor for this kind of project can be estimated to be between £50-£65 per hour, but typically, the tradesperson will not charge hourly rates for this kind of project and instead base the labor costs on the dimensions and type of the building, with the price being set in advance.

For a mid-floor flat the labor costs for insulating the cavity wall will be approximately £50-£130.

If you are looking for a semi-detached property The cost of a tradesperson will be around between £100 and £195 and then rising to £150-£250 in the case of a detached home and falling somewhere between £100 to £195 on a terraced property.

How long does it take to insulate the Cavity Wall?

Let’s discuss the timelines for building a cavity wall, depending on the size and type of property and whether scaffolding was utilized (so similar to the measures we discussed for discussing cost).

We’ll also examine the variables which determine the time frame for insulation of an interior hollow wall within this segment.

Insulate the cavity wall of a mid-floor apartment could take anywhere from one to two hours. In the absence of scaffolding the process takes an hour or so to complete this task for a terraced residence and between two and three hours for a semi-detached home and 3-4 hours in the event of a detached house.

If scaffolding is employed, you must add an additional hour to the times provided above.

In determining the length of time the job will take, these include among them accessibility and the condition of the workplace as well as the number of tradespeople who are employed as well as the weather (if you are working outside).

The types of Cavity Wall Insulation

As mentioned earlier there are three primary kinds of insulation for cavity walls. Let’s review of these types and the costs they incur.

Blown mineral fibre cost

The wall cavity insulation consists of fibreglass or mineral wool which are used to fill in the cavity by means to compress air.

This material is covered by the British Board of Agreement (BBA) certificates.

The cost for this kind for cavity wall insulation ranges from £13-£18 per square meters.


  • A powerful and effective method
  • May help prevent fire


  • Not always the best option.

Beads made of polystyrene Cost

They can be supplied in a loose form or with a soft but a bit sticky resin used to keep these beads. The granules, however, will be able to connect automatically.

Once more, compressed air is used to force this material into the cavity. Once more, these materials are covered by BBA certificates.

Polystyrene beads used for cavity wall insulation typically vary from between £18 and £22 per square metre.


  • Another technique that is common
  • Advanced approach


  • It can be a challenge and could also turn messy

Urea Formaldehyde Foam Cost

This substance is produced within the wall cavity due to the mix of two distinct chemical elements which are injected at the same simultaneously.

The material used is covered by BS:5618 with the injection of the materials covered by BS:5617.

The price for this kind of insulation typically ranges from £20-£40 per square meters.


  • Effective strategy


  • More complicated
  • It can be hazardous and require additional safety measures

The benefits of Cavity Wall Insulation

There are numerous benefits of the insulation of cavities walls. Let’s look at some of the main advantages of this kind of work.

Cost-Effective Method of Saving on Energy Bills

While insulating walls in the cavity can cost a few hundred dollars, it’s one of the least expensive methods of insulating your home, and also saving money on heating costs over the long term.

It’s generally less expensive than, say, replacing all windows of a house replaced by double-glazed windows.

On average, cavity wall insulation would save you about £100 to £200 per year. As a result, you’d be saving more than you spent after just two years.

Keeps the Home Warm

With its excellent heat retention capabilities cavity wall insulation is able to make a home more comfortable by reducing the loss of heat. This is particularly beneficial in winter, when temperatures are cold and could help to deal with cold spots within your home.

More eco-friendly

It’s not just that cutting down on heating costs reduce costs, but it’s also certainly more sustainable for the environment since it reduces emissions from your house. It can make the home more sustainable and appropriate for today’s 21st Century.

What is the cost to remove the Cavity Wall Insulation?

In the event the insulation is not working properly or allows dampness to enter the structure, it could be beneficial to have the cavities wall insulation taken off.

In other instances where urea formaldehyde was utilized, it might be the case that the chemical that are released create an entanglement to health.

Regardless of the reason, it’s likely to cost about £18 to £24 per square meter to remove cavity wall insulation.

It is important to note that if the cavities wall insulation led to the destruction of your walls, you have the possibility of making claims on your cavity wall to recover reimbursement.

This can be helpful should there be any cavities that have problems with insulation.


What is the length of time do the insulation in a cavity wall last?

A: It will last the duration of time it is maintained, and at a minimum for several generations. The majority of cavity wall insulation has a warranty for a period of 25 years.

Q: How can I tell if I have the cavity wall insulation?

A: It’s contingent on the type of wall. If brick walls have more than 260mm of thickness, then it most likely contains cavities.

A slimmer wall to be more solid. This is also true for stone walls. If you’re not sure it is possible to engage a professional to your home and look.

Q: Do you know of any grants for cavity wall insulation?

A: Yes. For more details go to gov.uk’s page on grants for energy.

Q: What happens when a wall in a cavity is not installed correctly?

A: It can cause the internal accumulation of water, and cold spots.

Q: How thick the wall of a cavity in general?

A: On an average an ordinary cavity wall will measure around 250mm thick as opposed to 220mm in brick walls.


  1. https://www.haringey.gov.uk/housing/housing-advice/home-heat-loss/home-insulation/cavity-wall-insulation
  2. https://www.knaufinsulation.co.uk/products/blowing-wool/supafil-34
  3. https://www.thegreenage.co.uk/5-reasons-to-install-cavity-wall-insulation/



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