Loft insulation Costs

Compare Loft & Roof Insulation Prices Near You

Home > Insulation Projects > Loft insulation

Average Loft insulation cost

The typical cost of Loft insulation is £600. Costs differ based upon the materials and the contractor selected. The upper price range can be as high as £690. The material costs are in most cases approximately £150

Average price per Loft insulation job in 2026

Avg. price low

Avg. price low
£380

Avg. price

Avg. price
£2,010

Avg. price high

Avg. price high
£3,628

£3800

£2850

£1900

£950

£0

Prices based on actual Loft insulation costs for your area, as reported by local LeadsDoWork members.

Loft insulation installation cost in your area 2026

Labour cost £420
Material cost £150
Waste removal £30
Time frame: 1-3 days

Advantages for Loft insulation

  • You'll prevent up to one half of the heat generated in your home from disappearing
  • Your home will feel warmer in the winter, and cooler in the summer
  • Reduce your energy bills - this could be as much as £200-250 per year with loft insulation
  • Your carbon emissions will also be reduced. This could be as high as 1.4t

Disadvantages for Loft insulation

  • Condensation and damp issues after loft insulation if done incorrectly

Loft insulation Manufacturers

Loft insulation FAQs

How thick should loft insulation be?

Over the years there has been an increase in the recommended thickness of loft insulation by the government. Obviously, the reason behind this is pretty simply - the thicker the layer of your loft insulation the bigger your savings. The UK government is very keen to every house in the country to have loft insulation fitted where possible as it helps to minimize the heating demands of these properties. Households get to benefit from loft insulation in so many ways which includes reduced energy energy bills as well as having a home that stays at a more comfortable temperature for longer.

 

Generally, for the government energy efficiency is crucial as it implies that the highest demand ( which is usually the time of the day when gas or electricity use is at its peak ) reduces, since each building requires slightly less energy. Overall, that ultimately implies that new power plants don’t have to be built which is some nice cost savings for the government.

 

In the 1980’s, any thickness of loft insulation from 25 mm to 50 mm was considered the standard. But then, building regulations stated that homes should have as much as 100 mm of loft insulation. Over time, this gradually increased to 270mm for new builds and also recommended for other properties, although not essential. As a result of this, there’s always a need to check how much insulation you currently have in your loft before you decide to purchase more. You may discover that you already have something within the range of 20 mm to 200 mm up there and knowing this and the insulation values will assist in determining how much more you’ll need to purchase, if any at all. You should also note that some modern materials can offer the same thermal insulation whilst not being as thick.

Does loft insulation cause condensation?

The short and simple answer to this question is yes, loft insulation does cause condensation. Over the years, problems with condensation in loft spaces have become increasingly common. While this may not be harmful in anyway, when the condensation becomes excessive it can lead to more serious issues taking root in your loft like wet rot, dry rot as well as black spot mould. Generally, the best thing to do if you’re concerned about the condensation in your loft space and that it may rapidly become a bigger problem is to get in touch with a damp specialist as soon as possible.

 

Even though insulating your loft space comes with a wide array of benefits like making the top floor rooms warmer, it’s however comes at the cost of making your loft or room space cooler. Condensation in lofts take place primarily due to the humid air making its way through insulation or other gaps into the loft space and touching a cooler surface which in turn results in beads of moisture on the timbers, lintels as well as the underside of the roof. This is why its always a great idea make use of thermal insulation with a vapour barrier that’s installed on the warmer side of the insulating material.

 

Condensation in loft is caused by excess moisture in the air and lack of adequate air ventilation. Here are some top reasons that gives rise to this in the loft:

  • Extra insulation has been installed in the loft leading to a restriction on the natural air circulation in the property.
  • When the storage boxes or other items that has been stockpiled in the loft blocks the roof vents.
  • The release of steam and moist air into the loft space by hot water tanks.
Is loft insulation flammable?

When thinking about the right insulation material for your loft, some of the first few things that comes to mind is the various properties of that material as well as how good they fit with your home’s needs.naturally, you’d like to ensure that the insulation will be efficient enough to add to the overall energy efficiency of your home, however there are also other features that may not get as much attention but also happens to be equally important. As the primary function of an insulation is to blanket your house to offer a barrier against heat loss, going for an insulation material that’s also fireproof is crucial as loft insulation can burn. Although most insulation materials are fireproof, a myriad of problems can actually make your insulation burn.

 

For instance, fibreglass insulation is produced using glass combined with plastic polymers and is naturally resistant to fire. However, even at that you’d have to be careful with batts that are supported with foil or paper due to the fact that these materials can burn pretty quickly. Cellulose, on the other hand, is not fireproof and is required to be treated by other flame retardants in order to help reduce combustion. Some of the best insulation materials that are resistant to fire includes the following:

  • Fibre glass. This is made of glass that’s spun into fibres, then combined using plastic polymers. As a result, fiberglass insulation is naturally resistant to fire.
  • Mineral wool. Having a high melting temperature, this insulation material happens to be a great fit for thermal applications due to its superior fire resistant properties. In fact, mineral wool is still naturally non-combustible even if composed of recycled iron and steel by-products, or from actual mineral rock itself.
How does loft insulation work?

A lot of an uninsulated property’s heat is lost through the roof and that’s even more alarming, when you realize this figure is up to a quarter of the total heat of the house. Hence, the tremendous importance of preventing this heat loss through loft insulation which will go a long way to help you against spending unnecessary thousands of pounds on heating bill as well as energy loss.

 

Loft insulation is an effective method to achieve the desired result, however the question is, how exactly does it work? Well, it’s time to find out!

 

Using either a fireplace or central heating to heat up your home, a large quantity of that heat would be lost through the roof of your home. Generally, heat rises and when it does, there’s simply no way to prevent it - it’s just science. Escaping by both the conduction and convection methods via your roof, the heat escaping through your ceiling, into the loft space and out into the open air outside can only be significantly reduced by laying loft insulation.

 

Generally, the added layer of insulation works by trapping the heat inside the room below the loft so as to enable the air within your house to stay warmer for longer. What’s more? The layer of insulation also keeps cold air from the outside from entering your home. As a result, you don’t have to heat your home as much in order to achieve the same temperature for each individual room. Over time, just by doing this you can potentially save hundreds pounds. Getting it installed in your home may actually seem a bit expensive at first, but it’s something that’ll eventually pay off.

How long does it take to install insulation?

How long it takes to install insulation will depend on the size of your property. In general, loft and cavity wall insulation can be installed in a day or two. External wall insulation will usually take longer to install. The rep or installer will be able to advise you when quoting for the job how long this will be.

Will insulation save me money on my energy bills?

This depends on the amount of insulation already present in your property. However, adding insulation has been proven to improve the energy efficiency of your home and decrease your heating bills, this is more obvious in older properties or where single glazing is still in situ.

What is the best loft insulation?

If you have a loft, then the next thing that’s crucial is a loft insulation. Asides from cutting down on your carbon footprint, when you’re able to install an effective loft insulation you can slash your heating bills by up to £250 per year. What’s more? Besides making your home more energy efficient, it can also increase the value of your property a great deal. So if you’re also considering the insulation of your loft, one of the few things that comes to mind is, what loft insulation is the best to incorporate? In order to help you make the best informed decision possible, this post is going to address this issue and put you on the right path.

 

In truth, there’s no way to say exactly which type of insulation is the best as all types usually have a different purpose as well as usage. The insulation you choose for your home’s loft is be based largely on the how you’re going to make use of the space as well as any unique challenges you might face given the shape of your home’s loft. Below are some types of insulation to give you a better idea:

  • Blanket insulation. This is the most common type that comes in rolls of rock, glass or mineral fibre ( or foil-backed felt ). It normally the most affordable and also a good all-purpose insulation which is easy to fit although not suitable for the roof.
  • Loose-fill insulation. This type of insulation features a loose, lightweight material such as cork granules, cellulose fibre, mineral wool etc. It can either be incorporated as a top up or on its own. The primary drawback is it isn’t very secure and can also be very messy.
  • Sheet insulation. This is the best solution for the roof’s underside as it offers a highly effective insulation for your loft space and can also be decorated over. The drawback here is that it’s usually the most expensive type to purchase and install.
How much is loft insulation?

More often than not, several homeowners fail to realize there’s so much value sitting right under their roof - the loft. When a loft is insulated, there are so many juicy benefits that can be derived. It can go a long way to save increase you energy savings and several more functions. Therefore, if you really wish to maximize the space under your home’s roof, you’d have to considering insulating it. So how much would it cost to have your loft insulated? Here, you’ll discover the cost of insulating your lofts so you that you can set a budget and start to plan.

 

The cost of insulating a loft is actually affordable for several individuals, however, this depends on a wide range of factors such as the size of the house as well as the type of insulation being installed. One significant factor is the insulating material that you choose to install. If done properly, you’d be able to prevent heat from escaping through the roof of the house which helps improve energy efficiency and ultimately, save you some money on heating bills.

 

If you’d prefer to make it a DIY project and you go for a blanket insulation it costs about £5 per m2. therefore, this will cost within the range of £100 to about £150 for a small home.

 

For a professional service, you’ll be provided with a quote for both the materials and labour. The amount will be based on the number of insulation required, the company hired, your location as well as the method selected. The price to purchase and install blanket insulation  would be between the range of £300 to £400 depending on the size of your home.

How To Install Loft insulation With ROCKWOOL Thermal Insulation Roll

Our reviews

Average

Would highly recommend

Would highly recommend, they found me a firm which I was happy with a quote they give me and went ahead and had my job done within 2 days of enquiring.

Good easy way to find a selection of…

Good easy way to find a selection of trades you need all in one place.

Love Local Quotes it's a big part of my …

Love Local Quotes it's a big part of my Business I would recommend to anyone

Weatherdry Insulation

Based: in Tamworth, B79

We are a company that specialises in Damp Proofing & Insulation. We have a 100% success rate in res...

Weatherdry Insulation reviews

John W., SY6
14th December 2020

Insulation | Loft / Roof in Church Stretton

Polite and friendly but did not provide the materials we wañted .

BAU UK

Based: in Petersfield, GU31

BAU UK are a complete home improvements specialists located in the South Coast, with focuses ranging...

BAU UK reviews

Paul A., BH15
15th May 2021

Insulation | Loft / Roof in Poole

Prompt response, pleasant and courteous contact, reasonably priced, work satisfactori...

Metropolitan Insulation

Based: in London, N5

Usemyloft is a superior form of loft insulation. It is permanent unlike conventional fibreglass/mine...

Metropolitan Insulation reviews

Sennen C., HA1
20th October 2015

Insulation | Loft / Roof in Harrow

Punctual and finished on time. Good value for money

Bright Home Renewables

Based: in Bournemouth, BH8

Bright Home Renewables are a leading polyurethane spray foam insulation, roofing and loft room speci...

Bright Home Renewables reviews

Paul F., HP10
7th March 2017

Insulation | Loft / Roof in High Wycombe

We were unable to proceed as the cost was more than we had anticipated, but the compa...

Renewable Solutions Team

Based: in Leigh, WN7

Renewable Solutions Team is based in Leigh and have 4 positive reviews

Renewable Solutions Team reviews

Matthew M., WA5
18th December 2016

Insulation | Loft / Roof in Warrington

Sent a person out to do surveyor out he did his job was a nice fella explained things...

DB Energy Assessments

Based: in Kidderminster, DY10

We are passionate about renewable energy and helping people and businesses save money through their ...

DB Energy Assessments reviews

P., B16
18th October 2016

Insulation | Loft / Roof in Birmingham

Honest opinion given which I valued very highly Could easily have said I need to redo...

GM Energy

Based: in Peterborough, PE1

GM Energy is based in Peterborough and have 26 positive reviews

GM Energy reviews

Robert H., PE19
2nd December 2015

Insulation | Loft / Roof in St. Neots

Good solid company.

Rated Local builders

Weatherdry Insulation Ltd

932 reviews
Based: in Tamworth, B79 7XH

We are a company that specialises in Damp Proofing & Insulation. We have a 100% success rate in resolving damp issues connected to any form of damp. We can also offer the latest solutions to condensation. We offer a FREE, NO OBLIGATION damp ...

BAU UK Ltd

57 reviews
Based: in Petersfield, GU31 4AD

BAU UK are a complete home improvements specialists located in the South Coast, with focuses ranging from windows and doors to insulation and solar. Fully accredited, insured and trained in the latest technologies, our team can offer leading services...

Metropolitan Insulation

6 reviews
Based: in London, N5 5DU

Usemyloft is a superior form of loft insulation. It is permanent unlike conventional fibreglass/mineral wool which deteriates and renders your loft floor unusable. We insulate under the roof in the rafters,keeping the heat out in summer and creating ...

Bright Home Renewables LTD

7 reviews
Based: in Bournemouth, BH8 8EW

Bright Home Renewables are a leading polyurethane spray foam insulation, roofing and loft room specialist. Whether you are a domestic client looking for loft insulation or roof stabilisation or an architect or contractor needing assistance with a ...

DB Energy Assessments

2 reviews
Based: in Kidderminster, DY10 2TN

We are passionate about renewable energy and helping people and businesses save money through their energy bills, and potentially even make a profit by making a few changes. DB Energy Assessments has ventured into a number of markets in the 5 yea...

Renewable Solutions Team LTD

4 reviews
Based: in Leigh, WN7 3XZ

Renewable Solutions Team LTD based in Leigh, offer services in Insulation. They have an average rating of 4 from 4 reviews. See their latest 4 star review below

GM Contracts LTD T/A GM Energy

26 reviews
Based: in Peterborough, PE1 5TP

GM Contracts LTD T/A GM Energy based in Peterborough, offer services in Insulation. They have an average rating of 4 from 26 reviews. See their latest 5 star review below

Similar Customer Enquiries for Loft insulation

24 Jul

Insulation | Loft / Roof

Marlow - SL7

Enquiry from: Kumi S

Start Date: Immediate

Could you please let me know how much you would charge if I would like you to check the condition of the current insulation and also if necessary to repair them? Thank you.

Post a similar request >

19 Jul

Insulation | Loft / Roof

Cannock - WS12

Enquiry from: Mark M

Start Date: Immediate

Loft room requiring total insulation (none existing), installation of 1 velux window, finishing of party wall which is partly open, sockets, lighting and a proper staircase from the room below (access...

Post a similar request >

17 Jul

Insulation | Loft / Roof

Battle - TN33

Enquiry from: Richard B

Start Date: Immediate

My partner and I are about to buy this house and it needs roof insulation. Please can you provide me with a quote and also details of any grants available please

Post a similar request >

09 Jul

Insulation | Loft / Roof

Llanfairfechan - LL33

Enquiry from: Stephen M

Start Date: Immediate

customer in the llanfairfechan area made an enquiry a couple of projects including loft & roof insulation.call anytime and arrange an appointment to discuss. below is some details about this project: ...

Post a similar request >

29 Jun

Insulation | Loft / Roof

Burton-on-Trent - DE14

Enquiry from: Ufuk C

Start Date: Immediate

Have replace my loft insulation

Post a similar request >

23 Jun

Insulation | Loft / Roof

Manchester - M41

Enquiry from: Maureen H

Start Date: Immediate

looking to get insulation installed

Post a similar request >

23 Jun

Insulation | Loft / Roof

Croydon - CR0

Enquiry from: Pat T

Start Date: Immediate

quotes for insulation needed

Post a similar request >

17 Jun

Insulation | Loft / Roof

Rainham - RM13

Enquiry from: Frasina P

Start Date: Immediate

I would like to do loft isolation of my property 3 bed terrace house

Post a similar request >

10 Jun

Insulation | Loft / Roof

Broadstone - BH18

Enquiry from: Ian K

Start Date: Immediate

Internal roof lining replaced without removing tiles plus replace loft insualtion.

Post a similar request >

08 Jun

Insulation | Loft / Roof

Rhyl - LL18

Enquiry from: Rinku P

Start Date: Immediate

Loft insulation and roof repair

Post a similar request >

04 Jun

Insulation | Loft / Roof

Benfleet - SS7

Enquiry from: Brian B

Start Date: Immediate

bungalow all prepared roof ready for insulation to take place. 50 foot x 30 foot approx a s a p. please. are you the property owner: owner of the property property type: detached do you curr...

Post a similar request >

01 Jun

Insulation | Loft / Roof

Strabane - BT82

Enquiry from: Elizabeth C

Start Date: Immediate

Loft and check wall insulation.

Post a similar request >

17 May

Insulation | Loft / Roof

Cowes - PO31

Enquiry from: Victor G

Start Date: Immediate

need my attic insulated and boarded? are you the property owner: owner of the property do you currently have loft insulation: yes do you require a top up: yes age of property: 1930-70 are you interest...

Post a similar request >

13 May

Insulation | Loft / Roof

Filey - YO14

Enquiry from: Debbi W

Start Date: Immediate

Loft insulation . Approx 36m2. Semi detached bungalow

Post a similar request >

07 May

Insulation | Loft / Roof

Ellon - AB41

Enquiry from: Moira C

Start Date: Immediate

Removal of old insulation and replace it

Post a similar request >

29 Apr

Insulation | Loft / Roof

Dereham - NR20

Enquiry from: Hev W

Start Date: Immediate

Would like an area of loft 12x50 foot approx to be insulated on the rafters

Post a similar request >

23 Apr

Insulation | Loft / Roof

Dereham - NR20

Enquiry from: Hev W

Start Date: Immediate

Insulate a 11x50 ft loft floor. Not boarded at present, old fibre glass cleared. Roof already insulated with quilted foil

Post a similar request >

19 Apr

Insulation | Loft / Roof

Manchester - M41

Enquiry from: Maria A

Start Date: Immediate

Small loft roof insulation

Post a similar request >

17 Apr

Insulation | Loft / Roof

Lampeter - SA48

Enquiry from: Andrew W

Start Date: Immediate

New loft insulation. It's a detached house with straightforward loft space. There is some insulation already there but it is at least 40 years old.

Post a similar request >

11 Apr

Insulation | Loft / Roof

Honiton - EX14

Enquiry from: Kyle F

Start Date: Immediate

As picked up by a surveyor. The foil backed insulation sheets that have been fixed between the rafters retrospectively should be removed. This installation is restricting the roof ventilation to the...

Post a similar request >

Local & reliable builders near me

Tell us about your loft insulation project

Answer a few quick questions, so we can match you with local builders who can help.

Find up to 4 builders in your area

Get free, no-obligation local loft insulation quotes from 4 verified builders working in your area.

Hire with confidence

Compare customer reviews, services and prices, and choose the right tradesperson for you.