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Home insulation prices 2021

Are you interested in home insulation costs? The cost for home insulation is dependent on what type of property you have. For example, if you live in a detached house, you can expect to pay more than someone living in a semi-detached or terraced house.

Benefits of home insulation:

  • Traps more heat in the home
  • Lowers energy bills
  • Insulates your home against external noise
  • Protects against damp problems
  • Helps to keep your property and possessions in good condition

Whether you’re looking for loft or cavity wall insulation installation, you can learn more about your options here.

Get a FREE quote

House with dormer windows
A quick guide to insulating your home and the costs
Insulating your loft or external walls is a great way to reduce your heating bills. They offer excellent potential savings too. So, it doesn’t take long for your external wall insulation investment to pay for itself.
But before insulating your home, it’s important to check 2 things:
  • Is your home is suitable for insulation?
  • Is your home already fitted with it?
Cavity wall insulation is unsuitable for walls where there isn’t a gap at least 50mm wide between them. If you have brickwork in bad condition, it will also need repairing before an installing can begin work on a cavity wall. Getting quotes from multiple registered installers helps you get the best installation for your home.
How do I know if my house has insulation?
If your property was built after 1990, chances are it already has cavity wall insulation. For older properties, check for an ‘outstanding energy performance’ certificate via the government’s website. It will say ‘filled cavity’ if the walls have been insulated. If the walls haven’t been inspected but the age and type of property suggest they should have insulation, it will say ‘assumed’.
Provided you can get into your loft space easily enough, you should be able to see if any insulation is present.

Cavity wall insulation

Insulating cavity walls are made from either polystyrene beads, mineral wool or foam. Installers pack it into any brick walls with a narrow gap between them. Whilst this helps to prevent heat from escaping through the walls, it also provides sound insulation and resistance to fire.
According to the Energy Saving Trust, it will cost around £475 for cavity wall insulation in a semi-detached property. It will cost about £725 in a detached one.
Type of property Terraced home Semi-detached home Detached home
Cost of cavity wall insulation £370 £475 £725
Estimated yearly savings £105 £160 £275

Loft insulation

The most common forms of loft insulation are rolls of foil-backed felt and mineral fibre. Although, installer may spray polyurethane foam or mineral wall might into hard-to-reach areas. Loft insulation is usually laid between the joists in your loft, which stops heat from the home rising into the loft and escaping the home. ‘Warm loft’ insulation, which involves insulating the inside of a roof on a loft conversion, is also available.
According to the Energy Savings Trust, loft insulation typically costs £300 in a semi-detached home. However, as it is estimated to save you around £135 a year on heating bills in semi-detached homes, it will have paid for itself in 3 years.
Type of property Terraced home Semi-detached home Detached home
Cost of Loft Insulation £285 £300 £395
Estimated Yearly Savings £115 £135 £225

Return to the top of the page to compare prices and find the registered installer for you.

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Your questions answered

Will insulating my home save me money?

When your home is insulated, you will need to rely less on your central heating. This means that insulation can save you money.

How thick should my insulation be?

For loft or attic insulation, the insulation material is recommended to be at least 12 inches thick. Some insulated homes will choose a thickness of up to 15 or even 20 inches.

What are the advantages of cavity wall insulation?

Cavity wall insulation works particularly well to act as sound insulation. It is also fire resistant and more affordable than other solid walls.

Can I get a government grant for cavity wall insulation?

By using our simple form at the top of the page to compare quotes, you can check whether you quality for a free insulation or partial insulation grant for home insulation.

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Privacy Notice

Leads2Trade Limited and our associated consumer brands (Trading as [Compare Companies/Double Glazing on the web/ Conservatory Online Prices/ Leads2Trade]) of A18, The Embankment Business Park, Vale Road, Heaton, Mersey, Stockport, Cheshire, SK4 3GN Company No 05987279 have created this Privacy Notice to help you understand what personal data we process and how we use it in our business dealings with you. We are registered with the ICO (Registration No: Z9692711).

If you have any questions about this Privacy Statement, you can contact us by email at  For the purposes of Data Protection legislation in the UK, we are a Data Controller. Our website is not intended, and we do not knowingly collect data relating to children.

This Privacy Notice is intended for:

How do we process your personal data?

So that we can provide a service to you need to process some of your personal data.  We make sure that we only collect what we need and have outlined below the various ways in which we process your personal data:

When you visit our website: We use cookies on our website which collect various types of personal data. This will include details about your visits to our website; page views, downloads, navigation and exit; IP address; geographical location; browser type and version; operating system; referral source; length of your visit.

Some of these cookies are necessary to ensure that the website works correctly, and other cookies require your consent.  You can find out more about our cookies and how you can manage your consent in our cookie policy here.

Our website may contain links to other external websites.  We aren’t responsible for the practices, policies or content of such websites and suggest that you check their privacy policies to ensure that you are happy to continue browsing.

When you become one of our consumer customers: We will process your name and contact details (phone number, email and postal address) so that we can fulfil our contract to you by providing you with the home improvement quotes you have requested, to answer any enquiries you may have and to monitor how the suppliers we work with are performing.

For certain home improvement enquiries where we are unable to reach you by telephone we will send you an email to introduce you to a potential company who can help you with the specific product that you are looking to receive quotes for. We currently work with one company (WarmZilla Ltd) for Boiler enquiries, one company (Safestyle UK plc) for double glazing enquiries and one company (Verisure Services UK Ltd) for Alarm enquiries.

We will call you to check that we have the correct information and learn about how we can connect you with the best quotes in your geographical area. We may send you an SMS message if your enquiry is received outside our operational hours or to provide an update on the progress of your enquiry. An SMS opt will be provided after failure to connect via phone.

Our phone calls are recorded for training purposes however, if you are uncomfortable with this, we will not proceed with the call and delete the recording.  We also use aggregated and anonymised data to keep records for our own business use.

When you become one of our business customers: We will process your name and business contact details (phone number, email and postal address) so that we register you and put you in touch with our consumer customers who have requested home improvements quotes from you.  Our contract is with your business however we will process the personal data of our business customers under our legitimate interest.  We have done a balancing test to ensure that we are processing your personal data fairly and respectfully.

When you send us an enquiry: You may have sent us an enquiry via the contact page on our website.  We will collect your name and contact details as it is in our legitimate interest to do so that we can enter into correspondence with you and answer your enquiry.

How long do we keep your personal data?

If you have consented to non-essential cookies:  You can find out more about our cookies and update your preference on our Cookies Consent Management Platform.

If you are a consumer customer of ours: we will keep your personal data for as long as we have business dealings with you and then for a further 12 months.  This is because the quotes that you obtain are valid for up to a period of 12 months and it is important for us to be able to assist with any enquiries you have during that time.

If you have consented to receive email marketing from us, we will keep your personal data until you unsubscribe. If you choose not to engage with our email marketing messages for a period of 12 months, we will not email you again and put your personal data on a suppression list.

If you are a business customer of ours: we will keep your personal data for as long as we have a contract with you and then for a further 7 years in accordance with HMRC guidelines.

How do we use your personal data to communicate with you?

Non-Marketing Communications include: service messages regarding quotes or appointments from our third party services to enquiries and other communications to ensure that we deliver the services you expect from us.

If you are one of business customers, you will receive emails regarding your registration, services messages and invoices.  You will have access to our members area dashboard portal where you can find more information about your account details with us.

Marketing Communications include: Emails regarding other services we offer as well as content marketing we hope you will find useful. If you are one of our consumer customers, you will only receive email marketing from us if you have given us your consent. We do send out unsolicited email marketing messages to our business customers when we feel we have a legitimate interest to do so. You are welcome to unsubscribe from marketing messages at any time.

If you have consented to marketing cookies such as Facebook Pixels you may be served Facebook Ads regarding our services.  You can change your cookies consent at any time by visiting our Cookie Consent Management Platform.  You may also wish to change your Facebook settings if you don’t want to see targeted advertising.

Social Media: We use Facebook, and Linkedin (for business purposes). We sometimes use paid advertising on these platforms, but we will only use custom audiences with your consent.  You can find a copy of this Privacy Notice on our Facebook page in the ‘About’ section.

Social Plugins: We use social plugins on our website pages which allow you to share products with your friends and families.  These buttons are deactivated by default and only activated once you click on them.  When you click on these buttons your personal data will be transferred to the plugin provider.  This will include IP addresses which are then used to serve you relevant ads.

Who has access to your personal data?

We share your personal data with various organisations so we can fulfil our contract with you to help us run our business and to fulfil our legal obligations.

These include: Marketing Agencies, Accountants, Webhosts, IT and CRM Agencies. We also use Microsoft, DropBox, and Infonotes to ensure that we run our business efficiently.

If you are one of our consumer customers: we will share your details with the suppliers in your geographical area who are able to give you a quote for the work, you require.  Our suppliers are registered with us and we ensure that they are reputable and certified where appropriate.  We will discuss this with you in our phone call so that you are aware of what is happening every step of the way.

We ensure that our systems are robust, and we will only share your data with organisations who have appropriate safeguarding mechanisms in place such as Standard Contractual Clauses.  We have Data Processing Agreements with our Data Processors and never sell personal data to third parties unless we have your agreement to do so.

If Leads 2 Trade is sold or transfers its assets to another party, your personal data could be one of the transferred assets.  If your personal data is transferred it will remain subject to this Privacy Notice.  Your personal data will be passed onto a successor in the event of a liquidation or administration.

What are your rights?

You have several rights which you can access free of charge.  In certain circumstances we reserve the right to charge a reasonable fee if your requests are unfounded or excessive.

You have the right:

We don’t use any automated decision making.

For more information about these rights and when you can request them, please visit the Information Commissioners Guide to Data Subject Rights

If you wish to exercise any of these rights, please contact us by email at We will respond to you within one month.  If your request is complex and we require more time, we will contact you and let you know within the first month.

How can you submit a query or a complaint?

We are always happy to answer your queries regarding privacy.  Please contact us by email at 0800 124 4308

If you have a complaint, please get in touch with us so that we can resolve any concerns.  You also have a right to lodge a complaint with the Information Commissioner’s Office if you believe your personal data has been processed in a way which does not comply with Data Protection Legislation.  You can call the ICO helpline on 0303 123 1113 or visit their website here.

Changes to this Privacy Notice

We keep this Privacy Notice under regular review.  The most recent update is 4th April 2022