Loft insulation Costs

Compare Loft & Roof Insulation Prices Near You

Home > Insulation Projects > Loft insulation

Loft insulation

Loft insulation

The natural direction for heat is up and uninsulated lofts will lose a quarter of your home’s heat. This means you’ll be paying out much more than you need to on energy bills and creating more carbon emissions in the process.

With the recommended amount of loft insulation you can slash your bills for 40 years, for little installation costs and a quick payback.

Whether your home is uninsulated, or is in need of a top-up, read more to find out the savings you’ll make with our loft lagging guide.

How much will I save with loft insulation?

Loft insulation is a great way to save money as it’s installed with minimal hassle and payback is as little as two years.

  • The Energy Saving Trust recommends loft insulation of 270mm in thickness to make the most from its heat saving abilities.

  • And with this recommended level you’ll be saving up to £175 every year. Considering installation costs range between £100 and £350, payback is achievable in just two years.

  • With loft insulation retaining heat and reducing bills for 40 years, you’ll see a brilliant return of investment on your purchase.

  • As well as the financial saving you’ll make, you’ll also be benefitting the environment by reducing your home’s carbon footprint. With the recommended 270mm of lagging you’ll be able to cut emissions by around 720kg a year.

Just topping up your existing loft lagging will help you save more money too, so it’s not just uninsulated properties that will benefit.

 

How much loft insulation do you need?

To fully increase the benefits that loft insulation provides it requires to at least cover the full floor with a gap around the sides for air flow. To measure up for insulation you can simply measure all the areas straight below and include those with each other allowing for wall widths. You don't require to be specific and also you ought to constantly under-estimate so you have additional insulation if called for. One essential point to bear in mind is that insulation must never ever be pressed right into the eaves because it will interfere with airflow.
If you're going for a warm loft then you'll require far more insulation to be able to cover the bottom of the roofing system along with the gable as well as party walls. Measuring up for this kind of task isn't going to be a simple Do It Yourself job so this is most likely a great time to hire the pros!

Recommended areas to insulate

Insulating your loft will retain heat in the home but will make the area above colder, which could result in pipes and water tanks freezing. This means they need to be insulated.

With cool air in the loft you could find draughts creeping through the loft hatch. This too will need adequate insulation and draught excluding material can be fitted around the frame’s edge.

 

Loft insulation quotes

Cheap loft insulation is a great way to reduce your bills as most heat loss in your home is through the roof. Lagging helps to retain heat, cutting bills by up to £175 a year.

If you’re interested in reducing your expenses and boosting your finances, complete our quick form and receive up to four FREE loft insulation quotes from vetted and reputable installers.

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 2022

Avg. price low

Avg. price low
£450

Avg. price

Avg. price
£600

Avg. price high

Avg. price high
£690

£800

£600

£400

£200

£0

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

Loft insulation installation cost in your area 2022

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 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.

Which type of insulation is best?

The best type of insulation for your property will depend on the type of walls and any insulation that’s already present. It’s usually a good idea to have some form of wall insulation as well as loft insulation, as this helps to prevent heat loss in both areas.

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.

How much loft insulation do I need?

Over the years, more and more home and property owners are beginning to realize the huge benefits that can be derived from loft insulation being a worthwhile investment. It’s quite worrisome the way in which energy bills have soared over the past 10 years and loft insulation is a considerable affordable energy efficiency measure that can go a long way to help increase your home’s energy savings.

 

As far back as the 1980’s, the standard when it comes to insulation thickness was 25 mm to 50 mm which was, at the time, considered to be sufficient. However, building regulations have changed the norm that now states that a new build needs to possess 270 mm of insulation in the loft in order to achieve the required u-value of less than 0.16/m2k based on the standard rock wool or sheep wool insulation.

 

Generally with loft insulation, there’s a law of depreciating returns which implies that the first couple of insulation centimetres will save you many times the cost of the installation, however an extra layer or centimetre is going to add less value to the point where it’ll no longer be wise or worthwhile to add any further centimetre. Therefore, with cheaper energy prices 30 years back, that additional couple of centimetres was not just worthwhile, but with the recent alarming rises in costs of fuel, that additional £10 savings per year has all of sudden changed to £30 which makes it become a lot more attractive.

 

If you already have 270 mm of loft insulation, regardless of the material you’re looking to add you’re most likely not going to benefit from a top up. The cost of the materials and installation will definitely be too high for the couple of pounds it’ll save you per year.

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.

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.
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.

How to Insulate an Attic

BAU UK

Based: in Petersfield, GU31

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

Latest review

Paul A., BH15
15th May 2021

Insulation | Loft / Roof in Poole

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

Weatherdry Insulation

Based: in Tamworth, B79

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

Latest review

John W., SY6
14th December 2020

Insulation | Loft / Roof in Church Stretton

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

Protecting Home Energy

Based: in Stockbridge, SO20

Protecting Home Energy is an experienced, professional, reliable and competitive service assisting y...

Latest review

Derrick C., BS25
6th June 2019

Insulation | Loft / Roof in Winscombe

Very professional the speed of contact and sending a surveyor was impressive. The adv...

METROPOLITAN INSULATION

Based: in London, N5

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

Latest review

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...

Latest review

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

Latest review

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 ...

Latest review

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...

HOME SMART ENERGY

Based: in Redhill, RH15

We specialise in renewable energy and A rated boilers, we provide funding solutions, including nothi...

Latest review

Amy L., BA21
31st August 2016

Insulation | Loft / Roof in Yeovil

Probably won't use as not what I really need, but efficient and helpful.

GM ENERGY

Based: in Peterborough, PE1

GM ENERGY is based in Peterborough and have 26 positive reviews

Latest review

Robert H., PE19
2nd December 2015

Insulation | Loft / Roof in St. Neots

Good solid company.

Rated Local builders

Weatherdry Insulation Ltd

4 review(s)
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 RISING or PENETRATING damp. We offer a FREE, NO OBLIGATION damp survey and quotation . We also specialise in loft...

Protecting Home Energy

1 review(s)
Based: in Stockbridge, SO20 6DF

Protecting Home Energy is an experienced, professional, reliable and competitive service assisting you in saving money and keeping your greatest asset your home's energy efficient. This is through the use of our industry leading approved energy effi...

SMART FOAM LTD T/A HOME SMART ENERGY

40 review(s)
Based: in Redhill, RH15 9LR

We specialise in renewable energy and A rated boilers, we provide funding solutions, including nothing to pay for 6 months with interest rates starting from 4.8%

BAU UK Ltd

11 review(s)
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 review(s)
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 review(s)
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 review(s)
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 review(s)
Based: in Leigh, WN7 3XZ

RENEWABLE SOLUTIONS TEAM LTD based in Leigh, offer services in Insulation. They have an average rating of 4.13 from 4 review(s). See their latest 4 star review below

GM CONTRACTS LTD T/A GM ENERGY

26 review(s)
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 4.32 from 26 review(s). See their latest 5 star review below

Similar Customer Enquiries for Loft insulation

15 Aug

Insulation | Loft / Roof

Falmouth - TR11

Enquiry from: Susan H

Start Date: Immediate

i .would like a quote for supply and laying roof insulation in the loft eco friendly would be an option are you the property owner: owner of the property property type: detached how many bedroom...

Post a similar request >

13 Aug

Insulation | Loft / Roof

Salisbury - SP1

Enquiry from: John L

Start Date: Immediate

i currently have 100mm of loft insulation (in place from the previous owners over 10 years ago) - can i increase this to the recommended amount (300mm?). it's a 3 bed semi detached property with a lof...

Post a similar request >

11 Aug

Insulation | Loft / Roof

Grimsby - DN36

Enquiry from: Giselle D

Start Date: Immediate

need to check and complete existing loft insulation. check possibility to insulate flat roof are you the property owner: owner of the property property type: detached how many bedrooms do you have: 3...

Post a similar request >

10 Aug

Insulation | Loft / Roof

Horley - RH6

Enquiry from: Ray W

Start Date: Immediate

i am looking for loft insulation with raised boarding above it are you the property owner: owner of the property property type: detached how many bedrooms do you have: 3-4 do you currently have loft i...

Post a similar request >

10 Aug

Insulation | Loft / Roof

Peterborough - PE1

Enquiry from: Matthew R

Start Date: Immediate

loft insulation. approx 44 sq m. access via 2 loft hatches. approx 3” of existing rock wool type matting - not fitted that well. needs tidying up and topping up to recommended levels. thanks are you...

Post a similar request >

10 Aug

Insulation | Loft / Roof

Cannock - WS12

Enquiry from: Matt G

Start Date: Immediate

Top up of loft insulation in two roofs of 4 bed semi

Post a similar request >

09 Aug

Insulation | Loft / Roof

Keighley - BD20

Enquiry from: John W

Start Date: Immediate

loft insulation, boarding and ladder installation quote. are you the property owner: owner of the property property type: semi detached how many bedrooms do you have: 3-4 do you currently have loft i...

Post a similar request >

09 Aug

Insulation | Loft / Roof

Wallasey - CH45

Enquiry from: David W

Start Date: Immediate

The loft space has existing insulation be we feel a further layer to bring this into line with the recomended value required .

Post a similar request >

09 Aug

Insulation | Loft / Roof

Lowestoft - NR32

Enquiry from: Neil T

Start Date: Immediate

fibre glass insulation enhancement to increase present installation in the loft

Post a similar request >

09 Aug

Insulation | Loft / Roof

Belfast - BT8

Enquiry from: Jenny O

Start Date: Immediate

customer made an online enquiry for loft & roof insulation and confirmed on telephone, sms and email they would like a call with a builder to discuss prices.please call to arrange an appointment to qu...

Post a similar request >

07 Aug

Insulation | Loft / Roof

Coventry Southern Satellite Villages & Kenilworth - CV8

Enquiry from: Michael M

Start Date: Immediate

Loft insulation Lead Loft insulation Lead Loft insulation Lead Loft insulation Lead Loft insulation Lead Loft insulation Lead

replace/top up loft insulation for semi-detached house with roof area of 8m x 9m approx. are you the property owner: owner of the property property type: semi detached how many bedrooms do you have: 5...

Post a similar request >

04 Aug

Insulation | Loft / Roof

Bonnybridge - FK4

Enquiry from: Stephen B

Start Date: Immediate

Hi there I’m looking at improving my band level loft Insterlation looks like a good way forward any other products you do I would be interested in need quotes thanks

Post a similar request >

04 Aug

Insulation | Loft / Roof

Skelmorlie - PA17

Enquiry from: Cameron C

Start Date: Immediate

block insuulation betwee joists are you the property owner: owner of the property property type: semi detached how many bedrooms do you have: 3-4 do you currently have loft insulationn: yes do you req...

Post a similar request >

04 Aug

Insulation | Loft / Roof

Peterhead - AB42

Enquiry from: Vanesa C

Start Date: Immediate

Changing current loft insulation to 270 mm insulation. We have a 100 mm insulation under boards but we would like the boards tio be removed and a new insulation to be put in and boarded again.

Post a similar request >

03 Aug

Insulation | Loft / Roof

Monmouth - NP25

Enquiry from: Roger R

Start Date: Immediate

dormer bungalow upper story insulation, floor and roof. are you the property owner: owner of the property property type: detached how many bedrooms do you have: 3-4 do you currently have loft insulat...

Post a similar request >

03 Aug

Insulation | Loft / Roof

Isle of Man - IM4

Enquiry from: David R

Start Date: Immediate

looking for bungalow loft insulation quote. are you the property owner: owner of the property property type: detached how many bedrooms do you have: 3-4 do you currently have loft insulationn: yes do...

Post a similar request >

03 Aug

Insulation | Loft / Roof

Crickhowell - NP7

Enquiry from: Stephen D

Start Date: Immediate

we live in a chalet bungalow and have an area of roof space approx 7m x 8m where the insulation has been messed up by previous work. this needs sorting and an additional layer of insulation added. ar...

Post a similar request >

02 Aug

Insulation | Loft / Roof

Wigan - WN2

Enquiry from: Gareth E

Start Date: Immediate

Need loft space insulating to recommended thickness 240mm I believe.

Post a similar request >

02 Aug

Insulation | Loft / Roof

Oxted - RH8

Enquiry from: Sue C

Start Date: Immediate

150/170mm thick fibre glass loft insulation are you the property owner: owner of the property property type: terrace how many bedrooms do you have: 1-2 do you currently have loft insulationn: no age ...

Post a similar request >

02 Aug

Insulation | Loft / Roof

Coventry - CV5

Enquiry from: Thomas G

Start Date: Immediate

rockwool loft insulation are you the property owner: owner of the property how many bedrooms do you have: 3-4 do you currently have loft insulationn: no age of property: 1970-2000 are you interested i...

Post a similar request >

How it works

Tell us about your Loft insulation project

Answer a few quick questions so we can match you with professionals who can help.

Find up to 4 Builders in your area

Get free, no-obligation quotes from 4 verified Builders working in your area.

Hire with confidence

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

Need more help?

6 Essential Tips for Installing Insulation Published: 16/02/2017 If you think your home needs new insulation, you have two choices. You can either hire a contractor to install it or have a go at doing it yourself. Insulation needs installing properly to ensure that it’s safe and effective. Hiring a professional to fit it is a reliable way to make sure this happens. […] Read this article
Your Loft Insulation Questions Answered Published: 06/09/2016 You might have a few loft insulation questions if you’ve never had insulation before. And even if your loft is already insulated, you might not know all the ins and outs of the process. So here we are – we’ve answered some of the most popular questions about loft insulation so you can make sense […] Read this article
How to Draught Proof your Home and Save Money Published: 07/07/2016 If you want to save money on your energy bills but don’t want to spend too much money, you could draught proof your home. Draught proofing is very efficient and will reduce your energy bills without you having to spend much money on materials. You’ll need to find all the unwanted gaps in your home […] Read this article