{"id":3307,"date":"2023-06-08T13:41:30","date_gmt":"2023-06-08T12:41:30","guid":{"rendered":"https:\/\/www.rightmove.co.uk\/guides\/?page_id=3307"},"modified":"2025-08-01T23:55:47","modified_gmt":"2025-08-01T22:55:47","slug":"home-insulation-guide","status":"publish","type":"page","link":"https:\/\/www.rightmove.co.uk\/guides\/energy-efficiency\/energy-at-home\/home-insulation-guide\/","title":{"rendered":"Home insulation guide: cavity walls, floors, roof and loft spaces"},"content":{"rendered":"\n<p><em><em>Take a look at some of the most effective ways to reduce heat loss in your home<\/em> and find out how different types of insulation could reduce your energy bills<\/em>.<\/p>\n\n\n\n<p>Good insulation prevents heat from escaping from your home, or from entering, and can help to reduce energy bills. And it will keep your home at a more constant temperature, so you can use your heating \u2013 or cooling system \u2013 efficiently.<\/p>\n\n\n\n<p>Around a third of all heat lost in a poorly insulated home escapes through the walls, while up to 25% can be lost through the roof. And between 10-15% of a home\u2019s heat can also be lost through poorly insulated floors.<\/p>\n\n\n\n<p>So, if your home feels unbearably hot in summer, and too cold in winter, no matter how high you put the heating on, what are the steps you can take?<\/p>\n\n\n\n<p>Energy experts have to use thermal imaging cameras to assess the insulation in the spaces of your home that you can\u2019t access. But you can start by checking if your home has an <a href=\"https:\/\/www.rightmove.co.uk\/guides\/energy-efficiency\/epc-energy-performance-certificate\/\">Energy Performance Certificate<\/a> (EPC). It will tell you if your property has cavity walls, or solid walls, and what type of insulation is thought to be fitted in loft spaces, and underneath floors. The insulation in each space will also a rating, which ranges from very good to very poor.<\/p>\n\n\n\n<p>Find out <a href=\"https:\/\/www.rightmove.co.uk\/guides\/energy-efficiency\/epc-energy-performance-certificate\/\">how to check if your home has an Energy Performance Certificate<\/a>.<\/p>\n\n\n\n<h2 id=\"how-does-insulation-impact-a-homes-energy-rating\" class=\"wp-block-heading\">How does insulation impact a home&#8217;s energy rating?<\/h2>\n\n\n\n<p>If an energy assessor identifies sources of draughts, or places where heat can escape, this can lower your <a href=\"https:\/\/www.rightmove.co.uk\/guides\/energy-efficiency\/epc-energy-performance-certificate\/\">home\u2019s energy-efficiency rating<\/a>. Details about the standard of window glazing, and wall, floor, roof and loft insulation (if it&#8217;s installed), will also be recorded.<\/p>\n\n\n\n<p>But it\u2019s difficult for an assessor to access floor and wall spaces, so they\u2019ll often need to make an assumption about the standard and type of material used, based on the type of property and when it was built. So, if you\u2019re improving your home\u2019s insulation, or buying a new home, it\u2019s a good idea to keep any records of the type of insulation that has been fitted so you can produce these when your EPC is next updated.<\/p>\n\n\n\n<h2 id=\"how-else-can-i-check-how-well-my-home-is-insulated\" class=\"wp-block-heading\">How else can I check how well my home is insulated?<\/h2>\n\n\n\n<p>You can start by finding the places where heat may be escaping from your home. Look for anywhere that you have an unwanted draught or flow of air. That includes windows and doors, brickwork, keyholes, loft hatches and pipework. Other signs of draughts include rooms that are noticeably colder than others when they\u2019re all heated equally, and interior walls that feel colder to the touch than other rooms.<\/p>\n\n\n\n<p>And during the winter months, you can also check if the frost or snow on your roof melts before your neighbour\u2019s does. That would indicate you\u2019re losing heat through your roof.<\/p>\n\n\n\n<h2 id=\"what-are-the-some-of-the-cheapest-ways-to-insulate-my-home\" class=\"wp-block-heading\">What are the some of the cheapest ways to insulate my home?<\/h2>\n\n\n\n<h3 id=\"1-draught-proofingpotential-annual-saving-40\" class=\"wp-block-heading\">1. Draught-proofing<br>Potential annual saving: \u00a340<\/h3>\n\n\n\n<p>Draught-proofing is a good place to start, as there are things you can do yourself. Block unwanted gaps around windows, doors, chimneys and floors that let the cold air in and warm air out (but first make sure they\u2019re not being used for ventilation). Add doorstep or draught excluders on the inside of external doors, put window film on windows to stop heat from escaping through the glass, and use sealant or filler around windows that don\u2019t open.<\/p>\n\n\n\n<h3 id=\"2-insulating-hot-water-tanks-pipes-and-radiatorspotential-annual-saving-70\" class=\"wp-block-heading\">2. Insulating hot water tanks, pipes and radiators<br>Potential annual saving: \u00a370<\/h3>\n\n\n\n<p>Put a hot water cylinder jacket that\u2019s at least 80mm thick around your hot water tank to keep water hot for longer while reducing the amount of heat the cylinder loses.<\/p>\n\n\n\n<p>You can also buy foam tubing to cover any exposed pipes between your hot water cylinder and boiler to reduce heat loss.<\/p>\n\n\n\n<p>Radiator reflector panels can be fitted behind your radiators fitted behind external walls, to reflect the heat back into the room, rather than letting it escape. <\/p>\n\n\n\n<h2 id=\"wall-floor-and-loft-insulation\" class=\"wp-block-heading\">Wall, floor and loft insulation<\/h2>\n\n\n\n<p>When looking into more expensive options for installing insulation, such as in roof and loft spaces, walls and floors, it\u2019s good to know what will make the biggest difference to heating savings and how long it will last.<\/p>\n\n\n\n<h3 id=\"roof-and-loft-insulationpotential-annual-saving-260-475\" class=\"wp-block-heading\">Roof and loft insulation<br>Potential annual saving: \u00a3260-\u00a3475<\/h3>\n\n\n\n<p>Loft spaces are the easiest and most affordable areas to insulate, compared to walls and floors. When done effectively, loft insulation produces the most noticeable results that can last for around 40 years.<\/p>\n\n\n\n<p>Even if you already have insulation up there, over time, any boxes piled up and stored on top of it can make it less thermally efficient.<\/p>\n\n\n\n<p>According to Energy Saving Trust, installing mineral wool insulation at a thickness of 270mm in a semi-detached, gas-heated house (with no roof or loft insulation) could save you \u00a3285 a year. And upgrading the thickness of existing insulation to 270mm will also reduce energy costs.<\/p>\n\n\n\n<h3 id=\"average-costs-of-installing-loft-insulation-and-average-savings\" class=\"wp-block-heading\">Average costs of installing loft insulation and average savings<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Type of property<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Average cost<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Average annual saving<\/strong><\/td><\/tr><tr><td>Detached house<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u00a31,200<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u00a3475<\/td><\/tr><tr><td>Semi-detached house<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u00a3930<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u00a3285<\/td><\/tr><tr><td>Mid-terrace house<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u00a3880<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u00a3260<\/td><\/tr><tr><td>Detached bungalow<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u00a31,200<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u00a3470<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\"><em>Source: <a href=\"https:\/\/energysavingtrust.org.uk\/advice\/roof-and-loft-insulation\/\">Energy Saving Trust<\/a><\/em><\/figcaption><\/figure>\n\n\n\n<p><em>Estimates are based on insulating a gas-heated home. Installation costs will vary. Figures for England, Scotland and Wales are based on fuel prices as of July 2023.<\/em><\/p>\n\n\n\n<h3 id=\"underfloor-insulationpotential-annual-saving-75-to-195\" class=\"wp-block-heading\">Underfloor insulation<br>Potential annual saving: \u00a375 to \u00a3195<\/h3>\n\n\n\n<p>Floor insulation prevents heat loss in winter and can also help to keep your home cool during the summer months. It creates a barrier that protects your home from the air flow beneath your property. It can also help reduce your heating bills.<\/p>\n\n\n\n<p>Newly-built homes tend to have solid concrete floors, while older homes are most likely to have suspended timber floors and insulation can be added underneath.<\/p>\n\n\n\n<p>Energy Saving Trust estimates that a typical suspended floor installation costs between \u00a31,600 and \u00a32,900, depending on the size of the space and how it\u2019s accessed. There\u2019s a higher cost for insulating solid floors.<\/p>\n\n\n\n<h3 id=\"cavity-wall-insulationpotential-annual-saving-145-to-520\" class=\"wp-block-heading\">Cavity wall insulation<br>Potential annual saving: \u00a3145 to \u00a3520<\/h3>\n\n\n\n<p>If your home was built after 1920, it\u2019s likely to have cavity walls. This type of insulation is injected into the cavity between the inner and outer walls of a home and sealed with cement, to help to keep heat inside.<\/p>\n\n\n\n<p>Installation costs vary, depending on the size of your home, but Energy Saving Trust estimates that you should be able to make it back in energy bill savings within five years.<\/p>\n\n\n\n<h3 id=\"average-costs-of-cavity-wall-insulation-and-average-savings\" class=\"wp-block-heading\">Average costs of cavity wall insulation and average savings<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Type of property<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Typical installation cost<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Average annual saving<\/strong><\/td><\/tr><tr><td>Detached house<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u00a34,600<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u00a3520<\/td><\/tr><tr><td>Semi-detached house<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u00a32,700<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u00a3300<\/td><\/tr><tr><td>Mid-terrace house<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u00a31,500<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u00a3180<\/td><\/tr><tr><td>Detached bungalow<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u00a32,100<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u00a3225<\/td><\/tr><tr><td>Mid-floor flat<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u00a31,000<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u00a3145<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\"><em>Source: <a href=\"https:\/\/energysavingtrust.org.uk\/advice\/cavity-wall-insulation\/\">Energy Saving Trust<\/a><\/em>. <br><br><em>Estimates are based on a gas-heated home. The average install cost is unsubsidised. Figures for England, Scotland and Wales are based on fuel prices as of July 2023.<\/em><\/figcaption><\/figure>\n\n\n\n<p>If you\u2019re looking to install cavity wall insulation, the first step is to arrange a survey from a qualified installer to check that your home is suitable. <a href=\"https:\/\/www.trustmark.org.uk\/\">TrustMark<\/a> can help you to find a trusted installer that is thoroughly vetted and continually monitored to ensure they meet required standards.<\/p>\n\n\n\n<h3 id=\"solid-wall-insulation\" class=\"wp-block-heading\">Solid wall insulation<\/h3>\n\n\n\n<p>An estimated 45% of the heat could be escaping from your home if you have solid walls. But insulating solid walls is considerably more expensive than insulating cavity walls. There\u2019s no gap between the inner and outer walls, so they can\u2019t be filled with cavity wall insulation.<\/p>\n\n\n\n<p>Solid walls can be insulated from the inside or the outside, and doing this will provide bigger savings on your heating bills. But it can be a disruptive process. The easiest, and most cost-saving time to insulate solid walls is to plan the work for when you\u2019re carrying out other home improvements, such as kitchen or bathroom renovations, or external extensions.<\/p>\n\n\n\n<p><a href=\"https:\/\/energysavingtrust.org.uk\/advice\/solid-wall-insulation\/\">Energy Saving Trust<\/a> estimates that solid wall insulation for a typical three-bedroom, semi-detached house can be around \u00a312,000 for external wall insulation, or \u00a38,500 for internal wall insulation. Energy bill savings range from \u00a3195 a year if you live in a mid-floor flat up to \u00a3710 if you live in a detached house.<\/p>\n\n\n\n<h2 id=\"what-insulation-grants-are-there\" class=\"wp-block-heading\">What insulation grants are there?<\/h2>\n\n\n\n<p>The government\u2019s <a href=\"https:\/\/www.gov.uk\/government\/news\/government-joins-with-households-to-help-millions-reduce-their-energy-bills\">Help to Heat scheme<\/a> includes a Boiler Upgrade scheme which provides grants to property owners to install low carbon heating systems such as heat pumps. It also provides funding to local authorities to help them upgrade energy-inefficient homes of low-income households in England.<\/p>\n\n\n\n<p>It comes with the Energy Company Obligation (ECO) which requires energy suppliers to help certain households to fit energy-saving measures.<\/p>\n\n\n\n<p>The Great British Insulation Scheme (formerly known as ECO+) is a new government scheme that is set to launch in the summer of 2023 and run until March 2026. It aims to help around 300,000 households by obligating energy suppliers to help people to reduce their heating bills through partial or full subsidised grants for the installation of things like loft and cavity wall insulation. Low-income households as well as those people living in the least energy-efficient homes (with an EPC rating of D or below) will have access to the scheme.<\/p>\n\n\n\n<h2 id=\"who-qualifies-for-these-grants\" class=\"wp-block-heading\">Who qualifies for these grants?<\/h2>\n\n\n\n<p>Which grants you might be eligible for will depend on your household income, where you live and who your energy supplier is. Further details and contact information <a href=\"https:\/\/www.gov.uk\/government\/collections\/find-energy-grants-for-you-home-help-to-heat\">here<\/a>.<\/p>\n\n\n\n<h2 id=\"can-i-get-my-home-insulated-for-free\" class=\"wp-block-heading\">Can I get my home insulated for free?<\/h2>\n\n\n\n<p>If you or anyone in your home receives certain benefits, you could be eligible for full funding on insulation. The benefits include Universal Credit, Working tax Credit, Severe disablement allowance, Income support and Child Tax Credit. See the <a href=\"https:\/\/www.government-grants.co.uk\/home-insulation-grants\/free-insulation\/\">full list and how to apply here<\/a>. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Take a look at some of the most effective ways to reduce heat loss in your home and find out how different types of insulation could reduce your energy bills. Good insulation prevents heat from escaping from your home, or from entering, and can help to reduce energy bills. And it will keep your home [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":5725,"parent":3469,"menu_order":24,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-3307","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":{"author_profile":[]},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Home insulation guide: cavity walls, floors, roof and loft spaces | Rightmove Guides<\/title>\n<meta name=\"description\" content=\"Insulation is one of the most effective ways to reduce heat loss in your home, and find out how different types could reduce energy bills.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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