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A Complete Guide to Internal Wall Insulation Grants (2025)
- The average cost of internal wall insulation ranges between £40 and £50 per m², meaning a typical three-bedroom semi-detached house would cost approximately £7,500 to insulate.
- Depending on your location, you may be eligible for grants such as the ECO4 Scheme, the Great British Insulation Scheme, Warmer Homes Scotland, or the Affordable Warmth Scheme to help cover the cost.
- To qualify for internal wall insulation grants, you typically need to be part of a low-income household, receive at least one form of government benefits, or have a home with a low EPC rating.
Up to one-third of your home's heat escapes through uninsulated walls, according to the Energy Saving Trust UK. This heat loss leads to soaring energy bills, uncomfortable living conditions, and a significant carbon footprint. With over 21 million homes in the UK lacking adequate insulation, this issue contributes to 27% of the country’s total carbon emissions.
For homes with solid walls or properties where external changes aren't possible, internal wall insulation offers an effective way to reduce heat loss. By improving your insulation, you could cut your energy bills by between £140 and £700 annually and reduce carbon emissions by as much as 2,100 kg of CO₂ per year.
While insulation can be costly, home insulation grants help make this upgrade more affordable. The UK government supports households through schemes like the Great British Insulation Scheme (GBIS) and the Energy Company Obligation (ECO4), offering free or low-cost insulation solutions for those who qualify.
In this WhatCost guide will cover everything you need to know about internal wall insulation grants, from eligibility requirements to the application process. We’ll also help you find trusted professionals by providing up to four free, no-obligation quotes tailored to your needs. All you need to do is to fill out our quick 30-second form. Click below to learn more.
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Internal wall insulation grants
Internal wall insulation grants are financial assistance programs aimed at helping low-income and fuel-poor homeowners and private renters improve their home's energy efficiency. By taking advantage of solid wall insulation grants, you can reduce heat loss, lower your energy bills, and decrease carbon emissions in your home, making it more affordable and accessible. For those of you with cavity walls, there are several grants for wall insulation available.
With 4 in 10 households in the UK struggling to pay their energy bills due to the rising cost of living, these grants are essential for creating warmer, more cost-efficient homes. Typically, internal wall insulation prices range from £40 to £50 per square meter, with an average semi-detached three-bedroom house costing around £7,500. Given the overall cost of living, this expense can be prohibitively high for many households in the UK.
Fortunately, the government and energy companies help fund grants for internal wall insulation, which aim to alleviate the financial burden of insulation and promote sustainable living.
Why insulate internal walls?
Adding internal wall insulation to your home is a highly effective way to improve energy efficiency, particularly in properties with solid walls that cannot accommodate cavity wall insulation. Here are some compelling reasons to insulate the internal walls of your home:
- Lower energy bills: Installing internal wall insulation can save you between £140 and £700 annually on your energy bills.
- Reduced carbon emissions: By decreasing your home's energy consumption, internal wall insulation can lower carbon emissions by 410 to 2,100 kg of CO2 each year, contributing to a more sustainable future.
- Increased property value: Enhancing your home's energy efficiency can raise its market value by up to 14%, according to GOV.UK.
- Long-lasting benefits: When properly installed and maintained, internal wall insulation can last for decades, often up to 25 years, providing long-term energy savings.
- No external changes: Since the insulation is installed indoors, it does not alter the building's exterior appearance. This is especially beneficial for listed buildings or homes in conservation areas where external modifications may not be permitted.
By utilising internal wall insulation grants, you can save money on energy bills, reduce your environmental impact, and increase the value of your home.
Different internal wall insulation grant schemes
Installing internal wall insulation can improve energy efficiency and reduce heating costs, but the initial expense can be challenging. To help offset these costs, several grants are available throughout the UK:
- Great British Insulation Scheme (England, Wales, and Scotland): Offers free or low-cost insulation to homeowners, landlords, and tenants. Eligibility is based on factors such as your home's Energy Performance Certificate (EPC) rating or specific Council Tax bands.
- Energy Company Obligation (ECO4) Grant: This grant requires energy suppliers to assist low-income, fuel-poor, and vulnerable households by providing insulation improvements to reduce energy bills.
- Warmer Homes Scotland Scheme (Scotland): This scheme covers the cost of energy efficiency improvements for eligible households. Criteria include age, income, and the receipt of certain benefits.
- Affordable Warmth Scheme (Northern Ireland): Helps low-income individuals improve energy efficiency in private accommodations, targeting those experiencing fuel poverty.
- The Warm House plan is due to launch in spring of 2025 and is expected to run 3 to 5 years. This scheme offers up to £15,000 per property to improve energy efficiency as well as an additional £15,000 to install low-carbon heating systems into your home.
For those living in park homes, it’s worth noting that both the GBIS and ECO4 schemes provide park home insulation grants. Contact your local authority or visit your government's official website to learn more and determine your eligibility. Colour, color
At What Cost, we can connect you with specialists who can assess your eligibility and guide you through the application process for any financial assistance available. By filling out our quick 30-second form, you can receive up to four free quotes from trusted insulation specialists in your area — with no hidden costs or obligations. Click below to get started and find out more.
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Who can apply for internal wall insulation grants?
Internal wall insulation grants aim to support different groups in improving their home's energy efficiency. Eligibility criteria vary depending on the specific grant scheme, but the following groups are typically eligible:
- Homeowners: If you own and live in your property, you may qualify for grants, particularly if your home has a low Energy Performance Certificate (EPC) rating or falls within certain Council Tax bands.
- Landlords: Grants are available for landlords if their tenants, who are responsible for paying energy bills, meet specific criteria, such as being low-income or receiving government benefits.
- Tenants: Private renters can apply for insulation grants with their landlord's permission. Tenants who meet low-income or vulnerable criteria may be eligible for support through schemes like the Energy Company Obligation (ECO4).
- Low-income and vulnerable households: These grants are often given priority to individuals on low incomes, receiving certain government benefits, or classified as vulnerable (e.g., elderly or disabled)
- Fuel-poor households: If your household spends a significant portion of its income on energy bills, you may qualify for grants designed to alleviate fuel poverty and improve energy efficiency.
Below, we provide further details on the specific criteria needed to qualify for internal wall insulation grants.
Low income households
Low-income households in the UK can apply for grants to install internal wall insulation, improving energy efficiency and reducing heating costs. Eligibility is based on income, property value, and council tax band.
Income Thresholds:
- In England, households with a gross annual income of £31,000 or less can qualify for grants like the Great British Insulation Scheme (GBIS) and Energy Company Obligation (ECO4).
- In Northern Ireland, the Affordable Warmth Scheme applies to households earning £23,000 or less.
Council Tax Bands:
- In England, households in bands A to D are eligible.
- In Scotland and Wales, bands A to E apply.
These grants make insulation more affordable, helping low-income households reduce energy bills. Contact your local authority or visit the government’s website for more details.
EPC rating of D or below
An Energy Performance Certificate (EPC) rating measures your home’s energy efficiency, ranging from A (most efficient) to G (least efficient). It’s a legal requirement for homes to have an EPC rating. Homeowners with ratings of D to G and private renters with ratings of D or E may qualify for free external wall insulation grants.
If your home has an EPC rating of E, F, or G, it likely loses substantial heat, resulting in high energy bills and increased carbon emissions. Government schemes like ECO4 and the Great British Insulation Scheme prioritise these inefficient properties to reduce fuel poverty and emissions.
These grants fund external wall insulation, adding a thermal layer to minimise heat loss, lower energy costs, and create a more comfortable living space. Arrange an EPC inspection via the UK government website to check your eligibility.
Households that receive at least one benefit
To qualify for internal wall insulation grants in the UK, households typically need to receive at least one government benefit. These grants aim to help low-income or vulnerable households improve energy efficiency and reduce heating costs. You may be eligible if you or someone in your household receives any of the following benefits:
- Income-based Jobseeker’s Allowance (JSA)
- Income-related Employment and Support Allowance (ESA)
- Income Support
- Universal Credit
- Child Tax Credit
- Working Tax Credit
- Pension Credit (Guarantee Credit or Savings Credit)
- Housing Benefit
- Disability Living Allowance (DLA)
- Personal Independence Payment (PIP)
- Attendance Allowance
- Carer’s Allowance
- Severe Disablement Allowance
- Industrial Injuries Disablement Benefit
- Child Benefit (subject to income thresholds)
How can you apply for internal wall insulation grants in the UK
Securing internal wall insulation grants is a straightforward process. Here’s a step-by-step guide to help you access funding and improve your home’s energy efficiency:
- Check your eligibility: Determine if you meet the criteria, such as having a household income of £31,000 or less, receiving qualifying government benefits, or having an EPC rating of D to G.
- Get an EPC assessment: If unsure of your home’s energy efficiency, arrange an Energy Performance Certificate (EPC) assessment. This rating is essential to demonstrate your need for insulation upgrades.
- Explore grant schemes: Research programs like ECO4, the Great British Insulation Scheme, or regional initiatives in Northern Ireland, Scotland, and Wales. Visit official government websites or consult your local authority for accurate information.
- Consult an approved installer: Many grants require you to work with certified insulation specialists. They can assess your home, verify eligibility, and guide you through the application process.
- Submit your application: Complete and submit your application with the help of your installer, ensuring all documentation is accurate and complete.
For the best results, get multiple quotes from trusted specialists to find the right professional and streamline your grant process. However, comparing various quotes from different suppliers is a time-consuming process. Luckily, WhatCost is here to simplify the process. By filling out our 30-second form, you will be provided with up to four free quotes from the best insulation specialists in your area. Click below to learn more.
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