Reduce Heat Loss & Energy Bills with Government-Funded Internal Wall Insulation
Improve comfort and save up to £500 per year with internal wall insulation.
Check if your home qualifies for a free or discounted installation under the ECO4 or Great British Insulation Scheme (GBIS).
Check Your Eligibility for Free Insulation Grants in 2025
Government-backed funding is available now under ECO4 and GBIS. See if you qualify in under 60 seconds.
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Your trusted partner for home insulation solutions
Internal Wall Insulation Grants also for Pensioners and Disabled Households (ECO4 & GBIS)
Pensioner? You may qualify for a FREE internal wall insulation grant.
Have a disability or health condition? Help may be available.
All work is completed by PAS 2035-compliant professionals, typically within a few hours.
Why Choose Us?
✔ ECO4 & GBIS Approved Installer
✔ Certified & Accredited Professionals
✔ 100% Government-Funded Upgrades
How it Works
- Apply online in 60 seconds.
- Get a free home survey.
- Enjoy free insulation upgrades.
What Is Internal Wall Insulation?
Internal wall insulation (IWI) is an effective way to improve your home’s energy efficiency and reduce heat loss through solid walls.
Older UK homes built before the 1920s often have solid brick or stone walls with no cavity, allowing heat to escape easily.
By fitting insulated boards or stud frames to internal walls, IWI creates a thermal barrier that keeps your home warmer in winter and cooler in summer, cutting heating bills by up to £500 a year.
All installations are completed by TrustMark-registered professionals to PAS 2035 standards, funded through the ECO4 and Great British Insulation Scheme (GBIS).
How Internal Wall Insulation Works
Internal wall insulation (IWI) works by fitting insulated boards or stud framing with insulation to the inside of external walls. This creates a continuous thermal barrier that reduces heat loss through solid walls — ideal for older homes built before the 1920s that don’t have a cavity.
Once installed, the insulation helps retain heat inside during winter and keeps your home cooler in summer, improving energy efficiency and comfort. By reducing heat loss, your heating system doesn’t have to work as hard — lowering energy bills and carbon emissions throughout the year.
Under the ECO4 and Great British Insulation Scheme (GBIS), internal wall insulation is often available free of charge or heavily subsidised, depending on your property and eligibility.
Benefits of Internal Wall Insulation
Upgrading or installing internal wall insulation is one of the most effective ways to make your home more energy-efficient and reduce heat loss through solid walls.
Whether you live in a period property or a solid brick home, internal wall insulation helps keep heat inside — making your home warmer, quieter, and more comfortable all year round.
Here are some of the key benefits of internal wall insulation under the ECO4 and Great British Insulation Scheme (GBIS)
Lower Energy Bills
Save up to £400 a year by reducing wasted heat and improving your home’s energy efficiency.
Warmer Home All Year Round
Maintain comfortable temperatures throughout the seasons.
Reduced Carbon Footprint
By using less energy, you can lower your household’s carbon emissions and environmental impact.
Improved EPC Rating
A higher Energy Performance Certificate (EPC) rating can make your property more attractive to buyers and tenants
Quick, Hassle-Free Installation
Loft insulation can usually be fitted within a few hours by accredited, TrustMark-registered professionals.
Government-Backed Support
Funded through the ECO4 and GBIS schemes, ensuring high-quality installation and compliance with PAS 2035 retrofit standards.
Internal Wall Insulation Cost and Savings (2025 Update)
Upgrading your internal wall insulation in 2025 is one of the most effective and affordable ways to reduce heat loss through solid walls, cut energy bills, and improve home comfort.
The typical cost of internal wall insulation in the UK ranges between £4,000 and £13,000, depending on your property size, wall area, and construction type.
However, under the Government-backed ECO4 and Great British Insulation Scheme (GBIS), many UK homeowners and tenants can receive internal wall insulation completely free or at a significantly reduced cost, depending on eligibility and property assessment.
Installing high-quality internal wall insulation can help you:
Save up to £500 per year on heating costs.
Reduce up to 45% of heat loss through solid external walls.
Improve your home’s EPC rating, making it more energy-efficient and increasing property value.
Enhance comfort year-round, keeping your home warmer in winter and cooler in summer.
Lower your carbon footprint, helping the UK move towards its net-zero goals.
With professional installation by TrustMark-registered experts, you’ll benefit from long-term energy savings, improved comfort, and peace of mind — all while meeting PAS 2035 retrofit standards.
Simple 3-Step Process Under ECO4 & GBIS
Government Backed ECO4 Scheme
The ECO4 scheme is a UK Government-backed funding programme that helps households in England and Scotland access free boiler replacement, insulation grants, and energy efficiency upgrades. If you meet the ECO4 eligibility criteria, you could qualify for fully funded home improvements to lower your bills and make your home warmer and greener.
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Frequently Ask Questions
Internal wall insulation (IWI) involves fitting insulated boards or stud framing with insulation to the inside of external walls. This creates a thermal barrier that keeps heat inside your home, reduces draughts, and improves overall comfort and energy efficiency.
Most internal wall insulation installations take 2–5 days, depending on the size and layout of the property. Professional installers ensure minimal disruption while completing work to PAS 2035 standards.
Common materials include insulated plasterboards, mineral wool, and rigid foam boards. Each material offers excellent thermal performance and is chosen based on wall type and moisture conditions.
When properly installed with vapour control layers and adequate ventilation, IWI will not cause damp. In fact, it helps reduce condensation and improves indoor air comfort when designed in line with PAS 2035 guidance.
Homeowners and tenants receiving qualifying benefits or living in low-income households may be eligible for free or heavily subsidised IWI under the ECO4 or Great British Insulation Scheme (GBIS).
Yes. If you rent your property, you’ll need your landlord’s written consent before installation. Many landlords support the upgrade because it raises EPC ratings and reduces heating bills.
Yes — for eligible households. Depending on your circumstances, the full cost may be covered by ECO4 or GBIS, or you may receive a significant subsidy toward the installation.
Internal wall insulation is ideal for solid-wall properties (typically built before 1920) that have no wall cavity. It can also be applied selectively in mixed-construction homes where external insulation isn’t suitable.
You can save up to £500 per year on heating bills by reducing heat loss through solid walls — while also making your home warmer and more comfortable all year round.
Simply complete our online eligibility check. We’ll confirm your qualification for the ECO4 or GBIS grant and arrange a free property assessment by certified professionals.
