With rising energy costs and a growing focus on energy efficiency, improving your home’s insulation has never been more important. For many UK households—especially those with solid walls—internal wall insulation offers a practical and effective solution. Thanks to government insulation grants, homeowners and tenants may now be eligible for internal wall insulation under the ECO 4 scheme and other UK initiatives.

If you live in a cold or draughty home and want to reduce heat loss, cut energy bills, and boost your comfort, you may qualify for internal wall insulation grants. In this article, we’ll explore what internal wall insulation is, how it works, who qualifies for funding, and how to apply in 2025.

What is Internal Wall Insulation?

Internal wall insulation (IWI) involves fitting insulation boards or stud walls lined with insulating material to the inside of external walls. It’s a highly effective way to improve thermal efficiency in solid wall properties that lack cavity walls.

Key benefits of internal wall insulation:

• Reduces heat loss through external walls

• Cuts down on heating bills

• Enhances indoor comfort and warmth

• Improves your EPC rating

• Qualifies for solid wall insulation funding UK

Unlike external insulation, internal insulation is installed inside the home, which is ideal for properties where external changes aren’t possible due to planning restrictions or appearance.

What are Internal Wall Insulation Grants?

The UK government offers free or subsidised internal wall insulation through several schemes aimed at helping households become more energy-efficient. These grants are primarily delivered via the Energy Company Obligation (ECO 4 scheme), which is funded by major energy suppliers.

The ECO 4 Scheme:

The ECO 4 scheme is designed to support low-income and fuel-poor households by improving home energy efficiency. Under this scheme, you could receive free insulation upgrades, including:

• Internal wall insulation

• Loft insulation

• Cavity wall insulation

• Floor insulation

• Heating upgrades (e.g. heat pumps, boilers)

Who Can Get Free Internal Wall Insulation?

To qualify for internal wall insulation grants, you and your home need to meet specific eligibility criteria.

✅ Property Requirements:

• Your home must be constructed with solid walls (no cavity).

• It must have a low Energy Performance Certificate (EPC) rating of D, E, F, or G.

• The property must be owner-occupied or privately rented (with landlord consent).

✅ Income & Benefits Eligibility:

You may be eligible if you or someone in your household receives one or more of the following:

• Universal Credit

• Income Support

• Jobseeker’s Allowance (JSA)

• Employment and Support Allowance (ESA)

• Pension Credit

• Child Tax Credit or Working Tax Credit

• Housing Benefit

• Personal Independence Payment (PIP)

• Disability Living Allowance (DLA)

If you're not on benefits but have a low income or health conditions, you might still qualify through the Local Authority Flexibility (LA Flex) route.

How Much Can You Save with Internal Wall Insulation?

Internal wall insulation can significantly reduce heat loss, especially in homes built before 1920. According to the Energy Saving Trust:

• A mid-terrace solid wall home could save £160–£270 per year.

• A detached solid wall home could save £400–£650 per year on heating bills.

By receiving free insulation UK through government grants, you not only avoid the upfront cost (which can range from £4,000 to £8,000), but also gain long-term energy savings.

Benefits of Internal Wall Insulation Grants

💷 Save Money on Installation:

Government grants cover all or most of the cost of installing internal insulation, making it affordable—even completely free for qualifying households.

🔥 Improved Warmth:

Reduce cold spots and heat loss, making your home warmer and more comfortable during winter.

🌍 Environmental Impact:

Lower energy consumption means reduced carbon emissions, supporting the UK’s climate targets.

🏠 Higher Property Value:

Energy-efficient homes with better EPC ratings are more attractive to buyers and renters.

📉 Lower Energy Bills:

Use less heating to maintain warmth—saving hundreds on energy bills annually.

What’s Included in the Grant?

When you apply for internal wall insulation grants UK, here's what may be included:

Work is carried out by TrustMark-registered and PAS 2035-compliant installers, ensuring quality and safety.

How to Apply for Internal Wall Insulation Grants

Applying for government insulation grants is simple. Here’s a step-by-step guide:

1. Find an Approved Installer

Contact an ECO 4 scheme or TrustMark-approved insulation installer in your area.

2. Eligibility Check

The installer will assess your benefit status, household income, and property type.

3. Home Survey

A free survey will confirm whether your walls qualify and if insulation is suitable.

4. Grant Application

Your installer submits the application and arranges funding. No paperwork for you.

5. Installation

Once approved, your new insulation is installed—usually within a few days.

What If I Don’t Qualify for ECO 4?

If you don’t meet ECO 4 requirements, consider these alternatives:

• LA Flex: If your local council participates, they may approve you based on income or health.

• Home Upgrade Grant (HUG): Available in some regions for off-grid homes.

• Green Deal (England & Wales): Finance-based model for home improvements.

• Local Energy Advice Partnerships: Some councils or energy hubs offer support for vulnerable households.

FAQs About Internal Wall Insulation Grants

Q: Is internal wall insulation messy or disruptive?
It can be, as it involves working on internal walls, but skilled installers complete it efficiently, often room-by-room.

Q: Do I need planning permission?
Not usually, as internal work doesn’t affect the outside appearance of your property.

Q: Can landlords apply?
Yes. Private tenants can benefit, but landlords must give consent, and EPC improvements may be required by law.

Q: What if I rent from a housing association?
Some social housing properties may qualify, depending on the landlord’s upgrade plans.

Final Thoughts

The Internal Wall Insulation Grant is a valuable opportunity for homeowners and tenants in solid wall properties to enjoy a warmer, more energy-efficient home—without the high cost.

With rising bills and cold winters, now is the perfect time to upgrade your insulation and take advantage of free insulation UK funding through the ECO 4 scheme and local authority support.

Don’t wait—get in touch with a registered installer today to see if you qualify for internal wall insulation grants and start enjoying the benefits of a warmer, greener home.