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Loft Insulation Cost

Loft Insulation Costs: What does it cost to insulate a loft?

Loft insulation is one of the most important things you can do to your home to make it more energy efficient. It fights off the cold in winter and battles the heat in summer, keeping the temperature in your home just right and your bills low.  

But if your loft isn’t properly insulated? Well, that’s when things go south. It turns out that a poorly insulated loft is one of the main reasons your house might be leaking warmth like a sieve. If this sounds all too familiar, read on and find out how easy it is to get sorted and how much loft insulation cost. 

When it comes to the cost, we’ll look at the price of materials and what you’d typically expect to shell out for installation. 

However, if the thought of upfront and installation costs has you sweating before the work even starts, don’t worry. Warma UK is on standby to help you access free or discounted loft insulation, thanks to several government backed grant insulation schemes. 

Wondering if you can get in on these deals? It’s definitely worth checking out your eligibility… 

See if you're eligible for free loft insulation grants
See if you're eligible for free loft insulation grants

What is loft insulation? 

Loft insulation is a barrier of material in your roof space that traps heat. It can either be laid between the joists (the horizontal beams along the floor of your attic) or the rafters (the angled beams that support the roof). 

Insulation between the joists keeps warmth in your living space below, and creates a cold loft. Insulation in the rafters allows you to keep warmth in the roof space as well. 

Various materials are used for loft insulation and you may be thinking what type of insulation should you use in your loft? Right? Okay let’s delve into that… 

Different types of loft insulation  

Blanket Insulation: This is the most common type of loft insulation, often made from materials like rock, glass, or mineral fibre. It’s also available as foil-backed felt and is known for its straightforward installation process and eco-friendliness due to the renewable nature of its materials.  

It’s a popular choice among homeowners for its soundproofing capabilities and the fact that it rarely shrinks or collapses, maintaining its insulating properties over time. 

Loose-Fill Insulation: Composed of lightweight materials such as cork granules, cellulose fibre, or mineral wool, loose-fill insulation is particularly useful for topping up existing insulation. It’s an environmentally friendly option that can reach difficult areas within the loft space. 

Mineral Wool Insulation: Made from volcanic rock or glass spun into fibres, mineral wool is an excellent thermal and acoustic insulator that is also fire-resistant. It’s a cost-effective option that is both lightweight and versatile, available in forms like blanket insulation and flooring rolls. 

Sheet Insulation: Also known as rigid insulation boards, these are made from synthetic or natural materials and are used for insulating the underside of the roof. They offer excellent thermal values and can be decorated over, making them a practical choice if you’re looking to make your loft a living space. 

Spray Foam Insulation: This type of insulation is applied as a liquid that expands into a foam, providing an airtight seal and cutting off any escape routes for heat. It’s known for its high performance, impressive R-value, and the added structural support it provides to the home. Spray foam insulation must be fitted by a professional, which will add to installation cost 

Sheep’s wool insulation: 100% natural, the wool is usually supplied as rolls, but can also be bought as large tiles. Sheep’s wool  is a very popular and effective insulation method. 

How much insulation do I need? 

Now you know the types of insulation, it’s important to know how much loft insulation you need. The amount of loft insulation you need depends on the existing level of insulation and the recommendations for your particular climate zone. In general, for most homes in the UK, the recommended depth for mineral wool insulation is 270mm according to the Energy Saving Trust . 

However, if you already have some insulation, you might not need to add the full 270mm. For example, if you have 100mm of insulation already in place, you would only need to add another 170mm to reach the recommended level. It’s important to note that other materials may have different recommended depths due to their specific insulating properties. 

How much does loft insulation cost? 

The cost of loft insulation in 2024 can vary depending on factors such as the size of your loft, the type of insulation material used, and any additional services required. On average, the cost of insulating your loft can range between £920 and £2,320 in the UK. 

The size of your loft plays a significant role in determining the total cost, with larger lofts costing more to insulate because you need more materials. Labour costs typically range from £200 to £300 per day and most loft insulation installations take about a day to complete.  

Type of Loft Insulation 

Cost Range per m² 

Blanket Insulation 

£7.75 – £11 

Loose-Fill Insulation 

£7.50 – £12 

Sheet or Foam Board Insulation 


Spray Foam Insulation 


Mineral Wool Insulation  

£15 – £20 

Also factor in additional costs for services like boarding the loft if you think you may need this in the future as getting it done at the same time as adding insulation will save you money. 

Warma UK offers loft boarding as part of our services where you can have all or part of your loft boarded. Costs are £150 per m2. 

For a typical 3-bedroom semi-detached home, the average cost of loft insulation hovers around £930. This cost can be quickly recovered through the savings you’ll make on your heating bill.   

How much money can i save by insulating my loft? 

When it comes to the cost of loft insulation and the annual savings it can bring, the figures are quite compelling for long-term savings: 

Detached house: £1,200 cost, £445 annual savings 

Semidetached house: £930 cost, £270 annual savings 

Midterrace house: £880 cost, £240 annual savings 

Source: Energy Saving Trust, based on going from no insulation at all to mineral-wool insulation of 270mm. 

Are there any free loft insulation grants in the UK? 

There certainly are. Right now you may be able to get your loft insulated for free! Thanks to schemes like the Great British Insulation Scheme and the Energy Company Obligation (ECO) scheme, lots of households can get loft insulation without spending a penny. These schemes are all about making homes more energy-efficient, cutting down on your energy bills, and doing a bit for the planet by reducing carbon emissions caused by your heating system working overtime to keep an uninsulated home warm. 

So, who gets in on this deal? Well, if you’re claiming certain benefits or your home has an EPC rating of D or below, you might qualify for 100% funding for insulation grants. It’s a pretty sweet deal.  

Checking if you’re eligible is super easy, just click on our eligibility checker below. 

See if you're eligible for free loft insulation grants
See if you're eligible for free loft insulation grants

Warma UK is on a mission to help people tap into these grants. We’re part of a big push to help people save on their heating bills and make homes across the UK more energy efficient. 

If you’re sitting there thinking, “Is this for me?” Why not give it a go? Check out the eligibility criteria for these schemes, fill in our eligibility checker or just give us a call for some friendly advice. We’re here to guide you through the process and help you get your hands on a free insulation deal along with other heating and energy saving upgrades including solar panels and new heating systems.

Athira Harish