Loft Insulation Prices and Benefits

A Warmer Home

Energy Savings

Prices and Sound Advice

With up to 25% of a home’s heat lost through the roof, it’s easy to see why millions of people have chosen to upgrade their loft insulation.

infographic showing how much heat is lost through a roof

Loft insulation is very effective and reduces heating bills so dramatically that most consumers get their money back in less than 6 years through energy savings.

Several government-backed grants are available to help those on low incomes, and most of the large energy suppliers offer discounts for “green energy” home improvements.

There are also plenty of hidden benefits to loft insulation; your boiler won’t need to run so often, saving on maintenance costs and the wear/tear of parts. Loft insulation also acts as a sound barrier, reducing noise from outside entering the home via the ceiling. We even included loft insulation in our guide to soundproofing products as it’s so effective.

But, how much does loft insulation cost? How much is needed, and how long does it take to get your investment back via lower energy bills?

We got in touch with 14 loft insulation installers and asked them for prices to install their recommended insulation.

Below you can see an average of the prices given to us and a works schedule which is based on the paperwork provided to us.

Average Loft Insulation Cost in the UK

Here are the details of the project:

  • Initial inspection of the loft and existing insulation.
  • Inspection of any hot water pipes and hot water tanks in the loft.
  • Written quotation supplied.
  • Existing loft insulation can often be left in place or removed if required.
  • The installation of new loft mineral loft insulation up to 300mm thick.
  • New pipe insulation and hot water tank jacket if required.
  • Disposal of original insulation (if it needed to be removed).
Project:Average Cost:
Install 200mm of mineral insulation on top of 100mm of existing insulation to a typical 3-bed home£300
Remove and dispose of old 100mm insulation and replace with 270mm mineral insulation in a typical 3-bed home.£450
200mm of extra insulation +pipe insulation and jacket for hot water tank in a typical 3-bed home.£500
Remove and dispose of old 100mm insulation and replace with 270mm mineral insulation and water tank jacket and pipe insulation in the loft of a typical 3-bed home.£600

As you can see from our prices above, an insulation upgrade is the cheapest option, and prices are around £300 for a 3-bed home.

The removal of the existing insulation and installation of 270mm of mineral insulation bumps the prices up to just below £450.

Keeping your original insulation but topping it up to 270mm costs around £500 if you also have any loft pipes insulated and a jacket put around the hot water tank.

The most expensive option is to remove the insulation, install a new 270mm mineral alternative, and install a tank jacket and pipe insulation. This costs around £600.

How much your loft insulation will cost depends on how much insulation you need, whether you need pipework lagging, and whether you have a hot water tank that needs a jacket.

Want to Use Your Loft For Storage? Read This First…

Over 65% of us use our lofts for storage, which poses a problem should you wish to upgrade your loft insulation.

Energy experts recommend 270mm of modern insulation, but the joists in most lofts are usually no more than 100mm deep.

Placing items on top of the insulation is a no-no as it compresses the insulation making it far less efficient at keeping warmth in the home.

The solution is either shelving for small items or loft legs:

Loft legs

By raising the floor height, you’ll have plenty of space for insulation, an air gap to prevent condensation and lots of surface space for storing your items.

Most people who install loft boards also upgrade or replace their insulation at the same time.

See how much loft boarding costs here.

Expected Energy Savings and “Payback”

Although up to 25% of a home’s heat is lost through the loft of an uninsulated roof, loft insulation won’t reduce your heating bills by this much. Bear in mind that some heat will still be lost as no insulation is 100% effective. Also, most homes have at least some existing insulation, and very few have none at all.

Based on research we conducted in 2021, we feel that occupants of a typical 3-bed home with no more than 100mm of existing loft insulation can expect savings of around 10% off their energy bills.

We believe that most people can get their money back via reduced heating bills in around 4-6 years. Coincidentally, it also takes around this long to recoup the cost of wall insulation, another project we recommend.

Also, consider that homes shouldn’t be completely airtight as the occupants require fresh air, which is pulled into the home as moist, warm air escapes. Over-insulation can also lead to condensation, hence why we don’t completely fill our lofts with insulation or wrap our walls in rubber sheets.

Can Loft Insulation be Fitted DIY?

Yes, loft insulation can be fitted “DIY”, but here are a few pointers:

  • The recommended depth of loft insulation is 270mm for modern products such as mineral wool.
  • Old insulation can be irritating to the eyes, throat and skin; use PPE if you have fibreglass or any old insulation type.
  • Overlaying the old insulation is always easier and cheaper than removing it. It’s also better for the environment too as there’s less waste.
  • Consider raising at least a small area of the floor with loft legs for storage space.
  • Consider fitting loft shelves for storing small boxes such as Christmas decorations and other rarely used items.

Insulation Rolls

Loft insulation rolls

These packs offer excellent value for money and contains rolls of 200mm top-up insulation made from 85% recycled glass. Choose from the 6-pack, which is perfect for a small loft or the 7-pack, which is ideal for a semi-detached home. The rolls are pre-cut to fit between loft joists and are easy to install.

Loft Shelf

Loft ledge shelf

Perfect for anyone wanting extra loft insulation and enough space to store boxes, bags and luggage. Each pack contains brackets and a wooden shelf that can hold up to 12kg. Remember to measure the width between your loft timbers as the brackets aren’t adjustable, and most of the bad reviews are from people who didn’t measure the space.

Raised Loft Floor Kit

Loft boarding kit

This kit contains the brackets and bars needed to support a 2.4m x 2.4m loft floor, making it perfect for those who need some storage space in their loft but don’t want to pay for their entire loft to be boarded out which can be expensive. You just need to buy the floorboards which can be found in most DIY stores and online.

Get a Price for Loft Insulation

We hope you found our guide to loft insulation insightful.

Now you know how much this insulation typically costs, it’s time to get s custom quote.

Tap the button below and fill out the contact form:

Loft Insulation

Get a Custom Price


When Were These Loft Insulation Prices Published?

We sourced prices for loft insulation in 2021 and published this guide in early April 2021.

Is Loft Insulation Good at Soundproofing?

The concrete or slate tiles on most roofs do very little to block noises, and neither does the underfelt or ceiling plasterboard. In fact, the void in most lofts acts as an echo chamber and can amplify sounds from outside or even noises that come through an uninsulated cavity.

Loft insulation does block some noises but works best as part of a soundproofing system that includes wall, ceiling and window soundproofing products.

Does the Old Insulation Need to be Removed?

In most cases, the old loft insulation can be left in place and a top-up of new insulation laid over it. This is more economical and better for the environment too.

The old insulation can and possibly should be removed if:

  • It’s flammable, combusts easily or gives off dangerous fumes when exposed to fire.
  • It is so old that it’s degraded and is no longer offering protection (i.e. old paper fill insulation).


Do These Prices Include VAT?

All of the firms we contacted for prices were VAT registered and charged VAT.

We’ve included VAT in our loft insulation prices that are shown on this page.

I have limited Funds, What Should I Insulate First?

Most homes have more wall space than ceiling space. Hence, in a typical home, up to 35% of heat loss is through the walls, and only about 25% is via the roof.

As most lofts will have some existing insulation, we suggest those on a limited budget start by insulating their wall cavity first before moving onto the loft. Windows only cover a small surface area, so their replacement shouldn’t be a priority unless they are in such a poor state that you can feel a breeze coming through them.

Don’t forget; those on a low income and also those receiving certain benefits can claim a grant or discount for some “green energy” home improvements such as insulation.

Here’s how to check if you qualify for free or discounted loft insulation:

  • First, check with your energy provider; most must offer a green energy scheme or discount to low-income households, including tenants.
  • Try your local council as the government has decentralised insulation grants and given local councils extra funding to cover “green energy” home upgrades.
  • This site has “government-endorsed advice” and, via a postcode checker, can tell you how and where to get a grant if you’re eligible.
How Long Does it Take to Fit The Insulation?

It takes a team of two about 1-2 hours to complete a standard loft insulation project, depending on the property’s size, of course.

Expect the work to take longer if you want the old insulation removed or any extra work completed, such as pipe lagging or tank jacket fitting.

Can I Have More Than 270mm Loft Insulation?

In 1965 the regulations stated that the minimum amount of loft insulation in a new build home must be equivalent to 28mm of insulation*.

In 1973, this changed to 70mm.

By 2002, the regulations required 200mm.

In 2013, a major revision of the regulations resulted in an upgrade to 270mm for new builds.

It’s safe to assume that the recommended amount of loft insulation will increase again at some point in the future.

There is nothing wrong with adding extra insulation provided moisture can still escape, so always use approved products.

* source: The Greenage

I Have Limited Loft Space But Need to Better Insulate My Ceiling, How Can I Do This?

You can hang a new ceiling below the existing one and fill the void with insulation panels. There will be some height loss, and the exact amount of insulation required will need to be calculated by a professional installer as the extra plasterboard will have some thermal properties too.

Where Can I Get a Custom Loft Insulation Price?

You can post details of your loft insulation project on Rated People, a site where tradespeople are vetted by staff and reviewed by their past customers.

Discover More Price Guides:

By Quotation Check

Cavity Insulation

If you’re considering loft insulation, check our guide to cavity wall insulation prices too. Most of the heat from a home is lost through the walls so they’re a great place to start.

Wall Soundproofing

This is how much the experts told us it would cost to soundproof a wall from noisy neighbours or street traffic. Prices are displayed per square metre so you can easily price your project.

Double Glazing

Sealed double glazing units not only block out external noise they also help to make the property more thermally efficient as the windows of any home are where lots of heat is lost.

Their prices for roofline installations were correct; we were given quotes from several firms, all were similar to [Quotaton Check’s]

Thanks, the estimates I was given were slightly below those you suggested but only by a fraction. When did you last update these prices?

Quotation Check has a database of prices for popular home improvement tasks. Check out their excellent information here.

Explore our benchmark prices for things like house rendering, plastering, garden improvements, driveways and much more.

Go see the prices on the Quotation Checker website; they’re suggesting a price for a new roof that’s much lower than that.