Get free quotes for insulation
Save money on your heating bills
What do you need insulation for? Complete a Short Form — Receive Free Quotes — Save Money On Energy Bills
Why get insulation?
  • Improve your home's thermal efficiency
  • Save on your energy bills
  • Slash your carbon footprint

Roof insulation costs 2024

Tamara Birch, senior writer, The Eco Experts
Written By
Maximilian Schwerdtfeger
Reviewed By
Published on 11 October 2024
  • Roof insulation costs, on average, between £400 and £600
  • Roof insulation can save you between £200-£380 on your energy bills each year
  • The cost you’ll pay for insulation depends on the material you use
  • You may qualify for the Great British Insulation Scheme

Roof insulation costs, on average, between £400 and £600, but this can increase depending on the type of roof insulation you get. Installation costs can add an additional £150 to £200 per day per tradesperson, though, with the average installation being one or two days. This will vary depending on the company you use. 

But roof insulation can save you between £200-£380 on your energy bills each year, according to the latest figures from the Energy Saving Trust.

In this guide, we dive deeper into roof insulation costs, including labour and materials costs, as well as how to reduce the cost of roof insulation and how much it would cost to remove or replace your current roof insulation.

If you’re already clued up on pricing and are ready to get some quotes, fill out our form and our trusted suppliers will be in touch. 

Gloved hands holding a piece of building insulation.

As we’ve already mentioned, roof insulation costs between £400 and £600, depending on the type of insulation you choose to install. 

We’ll go into more detail below, but as an overview, here’s the different types of insulation you can install:

  • Warm Deck Insulation: 
  • Spray Foam Insulation
  • Fibreglass Insulation
  • Mineral wool Rolls

Average roof insulation costs

The cost you’ll pay for insulation depends on the material you use. The table below shows the average roof insulation costs for different materials. 

Type of insulationArea coveredCosts
Fibreglass insulation20m²£380-£420
Mineral wool rolls20m²£300-£480
Spray insulation20m²£700-£900
Warm deck insulation boards20m²£600-£700

Roof insulation cost per m²

If you have less than or more than 20m² of area to cover, use the table below to get a more detailed idea on what you might pay.

Type of insulationCosts per m²
Fibreglass insulation£5-£7
Mineral wool rolls£6-£10
Spray insulation£21-£31
Warm deck insulation boards£16-£21

Similar to the above, the aforementioned costs are an estimate and we recommend getting a range of quotes, which you can get by filling in our form.

Labour costs

The labour costs you pay will depend on the work you’re having done. The average loft insulation cost in the UK is between £200-£250 per day. 

A conservatory roof insulation cost, however, will be drastically more. The labour and insulation costs will be between £2,600-£3,000 and takes one-to-three days. 

A flat roof insulation and a warm roof insulation costs around £600-£800. A spray roof insulation will be in the region of £700-£900 per 20m². 

Surveys and inspections

Before you begin your installation, you’ll need an initial survey conducted of your home. This will also be the case if you plan to apply for the Great British Insulation Scheme. 

In terms of what happens during the survey, a professional will inspect your property and discuss your plans for roof insulation and then explain the full process. 

From here, you’ll then decide on appropriate methods and which materials you’d like to use. 

As noted by MyBuilder, you’ll be a good candidate for cavity wall roof insulation specifically if: 

  • Your home was built between 1924 and 1982
  • Your wall cavities are at least two inches wide
  • Your brickwork or masonry is in good condition
  • Your walls are dry, with no signs of damp on the interior or exterior 
  • Your ventilation is adequate or there’s potential to fit a vent successfully
  • Your external walls are accessible to installers 

You can reduce roof insulation costs by utilising and applying for a government grant. 

The Great British Insulation Scheme is directly related to roof insulation that allows you to get free or cheaper insulation to reduce your home’s energy bills, but there are strict criteria around the grant. 

You might get support if your home:

  • Has an Energy Performance Certificate of D to G 
  • Is in Council tax bands A-D in England or A-E in Scotland or Wales

The good news is that you can be a homeowner, landlord or tenant, either privately or from a housing association. If you are renting, speak to your landlord before you apply, as you’ll need their permission before anything can be installed. 

The Scheme allows you to get support to install: 

  • Cavity wall insulation
  • Solid wall insulation
  • Loft insulation
  • Flat or pitched roof insulation
  • Underfloor insulation
  • Solid floor insulation
  • Park home insulation
  • Room-in-roof insulation

To determine whether you qualify for the Scheme, you’ll need to know your total household income, the types of benefits anyone living in the property receives, your email address or phone number so your energy supplier can contact you if you’re eligible. 

From here, your energy supplier will arrange an assessment of the property and any costs involved will be discussed with you afterwards. You can decide not to use the services if you disagree with the assessment or costs. 

There are other grants available, but these are specific to roof insulation. 

These include:

  • ECO4 – Run by energy suppliers and can cover the cost of installing energy efficiency improvements 
  • Warm Homes Scotland – Can cover up to 100% of the costs or offer a zero-interest loan if eligible
  • Nest (Wales) – Can cover up to 100% of the costs towards measures like loft or wall insulations
  • Home Upgrade Grant – Offers up to 60% of the costs of installation and will run until March 2025

Each grant or scheme focuses on low-income and vulnerable households, who would benefit the most from this financial support. 

You can find more information on these grants in more detail by checking out our full guide to government grants for insulation in the UK in 2024

Installer dressed in white overalls sits down to install spray foam insulation in a hard-to-reach area

How much does it cost to remove or replace roof insulation? 

If you already have roof insulation, there are some scenarios where it might need replacing.

Look for the following signs, as noted by My Builder

  • If your have unusually high energy bills, it could suggest poor insulation
  • If you have uneven temperatures throughout your home are also signs of poor insulation
  • If your insulation is old, there’s a chance it might not meet current energy efficiency standards, so might benefit from an upgrade

If any of these apply, it might be worth investing in new roof insulation. 

In terms of cost, a three-bedroom home, you can expect it to cost around £3,200. For every m², the average cost is around £40. 

This figure, according to CheckATrade, is assuming that it takes two-to-three tradespeople a week to complete, at £175 each day. 

“It also includes £100 for specialist disposable, given the toxic nature of some kinds of spray foam,” its website states. “You will also need to factor in the cost of skips.” 

The price you pay will be dependent on your location, the access to the attic or loft, the size of your loft and the thickness of the insulation. 

It’s worth noting that removing some types of roof insulation, such as roof foam, will be significantly higher than others. 

“With most insulation types, you’re looking at closer to £300 for safe removal and disposal, as it will generally just roll up or pull away,” the CheckATrade website claims. 

There are several options for roof insulation, meaning it’s not a one size fits all and really comes down to researching suppliers, getting tailored quotes from them and making the right choice for you. 

Prior to speaking with potential suppliers, make a list of questions you want to find out from them, such as installation timings, the full process, what happens if there are delays, etc. 

Also make a list of what’s important to you with your supplier. This could be anything from communication to offering competitive pricings.  

We can help with getting tailored quotes from our list of trusted suppliers. All you need to do is fill in this form with a few details and we’ll do the rest. When our suppliers receive your information, they’ll be in touch directly. 

Written by

Tamara Birch, senior writer, The Eco Experts

Tamara is a London-based journalist and has written about environmental topics for more than four years. This includes advising small business owners on cost-effective ways, like solar panels and energy-efficient products, to help them become more sustainable.

She has used her journalist and research skills to become highly knowledgeable on sustainable initiatives, issues, and solutions to help consumers do their bit for the environment - all while reducing monthly costs.

In addition to adopting sustainable practices in her personal life, Tamara has worked in the retail B2B space to help independent retailers think about their environmental choices and how they can help improve their business. She now uses this knowledge to help consumers do the same.

Her passion for sustainability and eco-friendly solutions stems from a long obsession with nature and animals and ensuring they feel looked after. In her free time, Tamara enjoys reading fantasy novels, visiting the gym, and going on long walks in new areas.

You can get in touch with Tamara via email at tamara.birch@mvfglobal.com.

More about

Reviewed By

Maximilian Schwerdtfeger

Max joined The Eco Experts as content manager in February 2024. He has written about sustainability issues across numerous industries, including maritime, supply chain, finance, mining, and retail. He has also written extensively for consumer titles like City AM, The Morning Star, and The Daily Express.

In 2020, he covered in detail the International Maritime Organisation’s (IMO) legislation on sulphur emissions and its effects on the global container shipping market as online editor of Port Technology International.

He also explored the initiatives major container ports and terminals have launched in order to ship vital goods across the world without polluting the environment.

Since then, he has reported heavily on the impact made by environmental, social, and governance (ESG) practices on the supply chain of minerals, with a particular focus on rare earth mining in Africa.

As part of this, in 2022 Max visited mines and ports in Angola to hone in on the challenges being faced by one of the world’s biggest producers of rare earth minerals.

His most recent sustainability-related work came much closer to home, as he investigated the eco-challenges faced by independent retailers in the UK, specifically looking at how they can cut emissions and continue to thrive.

Max lives in South London and is an avid reader of books on modern history and ghost stories. He has also recently learned to play the game Mahjong and takes every opportunity to do so. He is also yet to find a sport he doesn’t enjoy watching.

More about