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How Much Is Loft Insulation?

loft insulation cost

Have you noticed that your property is not retaining heat as well as it should be? Perhaps your energy bills are on the rise and you’re looking for ways to limit the cost? If either of these are the case, then look no further than loft insulation. Not only can insulating your loft reduce your energy bills, but it can make your household more environmentally friendly and limit any draught you may be experiencing.

The benefits of loft insulation are quite extensive, and there are even government grants available to help you afford the necessary measures. In this article, we will discuss: what loft insulation is, the different types of insulation material, and the pros and cons of loft insulation. Then we will go on to outline the different costs of each insulation method, the predicted lifespan of insulation, and how much money it could save you.

What Is Loft Insulation?

The name is rather self-explanatory, loft insulation is placed in the roof space of your home and acts as a barrier to stop heat from escaping. This is paramount to retaining heat in your household as heat rises and could be escaping through your loft space. Typically, roof insulation is placed between either the joists or the rafters of your loft space.

What Types Of Loft Insulation Is Available?

There are four main types of loft insulation that are installed in residential properties in the United Kingdom. These are: blanket insulation, loose fill insulation, insulation boards, and blown fibre insulation.

Blanket Insulation

Often made of mineral wool or sheep’s wool, blanket insulation is installed in the joists of your loft space. This type of insulation is one of the oldest forms available, and is one of the most popular types of insulation.

Loose Fill Insulation

Similar to blanket insulation, loose fill insulation is also lightweight. However, this measure is made of materials including cork granules and cellulose fibre, as well as mineral wool. Loose fill insulation is also placed between the joists of your roof space, and can be used either on its own or can top up existing insulation methods.


Insulation Boards

As the name suggests, insulation boards are quite literally boards that are installed either over or between your roof’s joists. The boards are typically made out of either Polyisocyanurate (PIR) or Polyurethane (PUR), however, a variety of materials can be used to make insulation boards. You can also purchase sheet loft insulation as an alternative to insulation boards.

Blown Fibre Insulation

Differing from the previous three insulation methods we have already mentioned, blown fibre insulation has a more fluid effect. Rather than being cut into certain shapes to fit your loft space, blown fibre insulation is quite literally blown into the required areas. There are two different types of blown fibre insulation, cellulose insulation and fibreglass insulation.

Pros And Cons Of Insulating Your Loft

Benefits Of Loft Insulation

Advantages of installing loft insulation
Advantages Explanation
Save money on your energy bills Loft insulation works by improving heat retention in your home. If your home retains more heat, the less you will need to turn your heating on. Which, in turn, will lower your heating bills.
Makes your home more comfortable to live in Have you ever experienced unexplained draughts in your home that you just can’t seem to get rid of? Draughty lofts are quite common, and may be your issue. By insulating your roof space, you are less likely to experience draughts in your property.
Lower your carbon footprint As we have previously mentioned, installing loft insulation should make you less reliant on your central heating system. While this will lower your energy bills, it should also reduce your carbon footprint.
Reduced noise pollution An extra benefit of loft insulation is that the material can also reduce the noise you hear from outdoors.


Drawbacks Of Loft Insulation

Disadvantages of installing loft insulation
Disadvantages Explanation
High initial costs While loft insulation can save you money in the long run, the high initial costs can be off putting.
Risk of moisture and dust Due to the heat retention goals of loft insulation, the measure will also limit the amount of air ventilation in your loft space. This could lead to dust and moisture build-up, the latter being a leading cause of condensation and dampness.
Could lead to asbestos If you live in an older property, you should check whether any previously installed insulation contains asbestos. Asbestos is extremely dangerous to public health, so any insulation containing it should be replaced as soon as possible.
Difficult to install Due to the location of loft spaces, it is understandable that installing insulation can be extremely difficult. Depending on the shape of your roof, it may not be possible for you to install loft insulation.


How Much Does Loft Insulation Cost?

Now that you understand what loft insulation is and the types of insulation methods available, we will now outline how much loft insulation costs. This section will contain average loft insulation prices, however there are a variety of contributing factors that can affect the final cost of loft insulation. These factors include:

  • The size of your loft space.
  • The amount of loft insulation you require.
  • Labour costs, especially if installation takes longer than expected.
  • The type of loft insulation you have purchased.
  • And if the insulation installer needs to remove any existing insulation.

The prices included in this section should only be taken as a guideline. If you are looking for more specific costings related to your household, why not get in touch with our experts at ZOA Eco Grants today?

Blanket Insulation Costs

How Much Does Blanket Insulation Cost?
House Size Average Loft Insulation Costs
Terraced house £125 to £160
Semi-detached house £200 to £250
Detached house £300 to £375
Bungalow £375 to £420


Loose Fill Insulation Costs

How Much Does Loose Fill Insulation Cost?
House Size Average Loft Insulation Costs
Terraced house £180 to £225
Semi-detached house £290 to £360
Detached house £430 to £540
Bungalow £700 to £730


Insulation Board Costs

How Much Do Insulation Boards Cost?
House Size Average Loft Insulation Costs
Terraced house £250 to £310
Semi-detached house £400 to £500
Detached house £600 to £750
Bungalow £1,000 to £1,200


Blown Fibre Insulation Costs

How Much Does Blown Fibre Insulation Cost?
House Size Average Loft Insulation Costs
Terraced house £1,375 to £1,720
Semi-detached house £2,200 to £2,750
Detached house £3,300 to £4,125
Bungalow Approximately £3,588

Spray Foam Insulation Costs

While we have covered the four main types of loft insulation above, another form you may have also heard of is spray foam insulation. Typically, spray foam insulation will cost around £25 to £50 per square metre. However, there are a variety of disadvantages that come along with opting for this type of insulation, including:

  • It could lead to condensation and damage due to the reduced amount of airflow.
  • It could lead to a weakened roof.
  • This insulation could increase the risk of rot developing in your roof supports.
  • All of the issues mentioned above can often lead to mortgage lenders being less likely to lend to you.


Can You Get Free Loft Insulation?

It is possible, through the application of government grants, to get either free or cheaper insulation for your loft space. Typically, being eligible for cheaper insulation usually is as a result of your property having a low energy performance certificate rating. We understand that the cost of loft insulation is quite steep, especially initially. However, there is funding out there to help you. Here at ZOA Eco Grants, we wish to help you save as much money as possible, and we have all the information you need to know about loft insulation grants.

There are three main types of loft insulation funding available, which are:

  • ECO4 scheme.
  • LA Flex scheme.
  • Great British Insulation Scheme.


ECO4 Scheme Explained

The ECO4 scheme was designed to aid the most vulnerable households in the UK, and help improve their energy efficiency levels. In turn, implementing energy efficiency measures should reduce your household energy bills while also decreasing your carbon footprint. Loft insulation costs can be quite high, so if you fulfil the eligibility criteria, you may be eligible for reduced or even free loft insulation.

LA Flex Scheme Explained

The LA Flex scheme is a branch of the ECO4 scheme, both having the same goals and providing the same services. However, due to the strict eligibility criteria of the ECO4 scheme, this initiative provides local authorities with additional powers to grant funding to reduce loft insulation cost.

Great British Insulation Scheme Explained

Similar to the ECO4 and LA Flex schemes, the Great British Insulation scheme aims to provide insulation to the least energy efficient homes in the United Kingdom. Open to England, Scotland, and Wales, this initiative can save you large sums of money when it comes to loft insulation cost if you fulfil the required eligibility criteria.


Are There Any Additional Loft Insulation Costs Post-Installation?

While we have discussed the initial cost of loft insulation, there are also additional costs related to the purchase. You may accrue additional costs due to these following reasons:

  • If there is old loft insulation in your loft space that the insulation installer will need to remove before the new measures can be fitted.
  • When the fitters come to install insulation at your property, you may need to hire a skip in order to dispose of any waste products.
  • If your roof space is hard to reach, or oddly shaped, you may experience higher loft insulation labour costs as the installers may need to spend more time than anticipated at your property.
  • Unforeseen difficulties including a hard to reach loft hatch, additional safety equipment, exposed electrical wires, the need for loft legs or a loft ladder may all lead to additional costs.


How Much Money Can I Save With Loft Insulation?

Having worked out how much loft insulation may cost you, the next important sum to calculate is how much money insulation can save you. There are a variety of contributing factors that can influence how much money you may save, including: the type of insulation you install, the amount of heating you use in your household, the size of your property, and the amount of insulation you require to insulate your loft.

However, the figures (which were obtained via Energy Saving Trust) included in the two tables below should give you a general idea on the savings available through loft insulation installation. The first table outlines the savings when your household goes from having 0 mm of insulation to 270 mm.

How much money can insulating my uninsulated loft save me?
House Type Average Yearly Savings in England, Scotland, Wales, (and Northern Ireland)
Bungalow £440 (£465)
Terraced house £240 (£255)
Semi-detached house £270 (£285)
Detached house £445 (£475)

While the second table displays the annual savings available if you continue to top up your loft insulation from 120 mm to 270 mm each year or when necessary.

How much money can I save by topping up my insulated loft?
House Size Average Yearly Savings in England, Scotland, Wales, (and Northern Ireland)
Bungalow £40 (£45)
Terraced house £25 (£25)
Semi-detached house £25 (£25)
Detached house £40 (£45)


How Long Does Loft Insulation Last?

Considering the high loft insulation cost, you may be curious as to how long the insulation should last, in order to work out your return on investment. Loft insulation has a predicted lifespan of around 40 years, if it is installed correctly and maintained well. 

We recommend that you have your insulation inspected every 10 years as a minimum, to ensure that it hasn’t degraded too much. On an even more positive note, some loft insulation methods have been known to last up to 100 years.

How Long Does Loft Insulation Installation Take?

The length of time it would take to install loft insulation heavily depends on both the size of your property and the type of insulation you have opted for. To give you a general idea on the length of time it would take to install loft insulation in your home, we have included the following figures:

Installation times:

  • Terraced house: Installing insulation will take between 3 to 4 hours on average.
  • Bungalow: Installing insulation will take between 4 to 6 hours on average.
  • Semi-detached house: Installing insulation will take between 3 to 4 hours on average.
  • Detached house: Installing insulation will take between 4 to 6 hours on average.

If you are looking for a more specific time frame on how long it would take to install insulation in your home, then why not get in touch with ZOA Eco Grants today? Our industry experts will be able to provide you with a more specific time frame.

How Much Is Loft Insulation Summary

Due to the variety of property types and sizes available across the United Kingdom, estimating your final loft insulation cost can be very difficult. However, with benefits including reduced energy bills, minimising your carbon footprint, limiting draught in your home, and improving the noise pollution for outdoors, it’s clear to see why loft insulation is so popular. 

If you want to embrace the various benefits that come along with loft insulation, then why not install an insulation method? In the table below, we have outlined the average cost of each of the four main insulation methods depending on the size of your household:

How much will loft insulation cost me, and how much can I save?
Average cost of blanket insulation Average cost of loose fill insulation Average cost of insulation boards Average cost of blown fibre insulation Average savings in England, Scotland, Wales, (and Northern Ireland) 
Terraced house £125 to £160 £180 to £225 £250 to £310 £1,375 to £1,720 £240 (£255)
Semi-detached house £200 to £250 £290 to £360 £400 to £500 £2,200 to £2,750 £270 (£285)
Detached house £300 to £375 £430 to £540 £600 to £750 £3,300 to £4,125 £445 (£475)
Bungalow £375 to £420 £700 to £730 £1,000 to £1,200 Approximately £3,588 £440 (£465)

If you are ready to install loft insulation in your home, then why not get in touch with ZOA Eco Grants today? Our insulation experts can help you find the perfect insulation method for your household and answer any remaining questions you may have.


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