About the service
Internal Wall Insulation (IWI) is a smart solution to improve the energy efficiency of homes with solid walls, where cavity wall insulation isn’t an option. By adding insulated boards or stud walls with high-performance insulation to the inside of your property, you can significantly reduce heat loss, lower energy bills, and keep your home warm and comfortable.
Benefits of Internal Wall Insulation
- Reduce heat loss through solid walls and cut energy bills
- Improve comfort by eliminating draughts and cold spots
- Long-lasting insulation with minimal maintenance
- Helps achieve a better Energy Performance Certificate (EPC) rating
- Suitable for properties where external insulation isn’t possible (e.g., conservation areas, listed buildings)
External vs Internal Wall Insulation
Both External Wall Insulation (EWI) and Internal Wall Insulation (IWI) are effective ways to insulate solid walls and improve your home’s energy efficiency. The best choice depends on your property type, budget, and personal preferences.
How it works: Insulation boards or stud walls fitted inside your property
Best for: Homes in conservation areas, listed buildings, or where external changes aren’t possible
Installation impact: Work is carried out indoors; may require redecoration and moving fixtures
Why choose us
Certified Installers
Qualified professionals ensuring safe and efficient installations
Tailored Solutions
Insulation designed specifically for your property and needs
Energy Efficiency Focused
Helps reduce bills and improve home comfort
End-to-End Support
From eligibility checks to installation and compliance
Services offered
- Internal wall insulation using insulated boards or stud walls
- Full property survey and tailored installation plan
- Professional, BBA-approved materials
- Integration with other ECO4 measures for maximum efficiency
- PAS2035 compliance assurance
- Improved EPC rating and long-term energy savings
ECO4 Grant Eligibility
You may qualify for a fully funded ECO4 internal wall insulation installation if your property meets the following criteria:
Your home has an Energy Performance Certificate (EPC) rating of D, E, F, or G
Someone in the household receives income-related benefits such as:
Child Tax Credit (CTC)
Income-Based Jobseeker’s Allowance (JSA)
Income-Related Employment and Support Allowance (ESA)
Pension Credit (Guarantee & Savings Credit)
Universal Credit (UC)
Working Tax Credit (WTC)
Income Support
Housing Benefit
Child Benefit (subject to income thresholds)
Child Benefit Income Thresholds
| Household Type | Single Claimant Annual Income | Couple Annual Income |
|---|---|---|
| 1 Child | £19,900 | £27,500 |
| 2 Children | £24,800 | £32,300 |
| 3 Children | £29,600 | £37,200 |
| 4+ Children | £34,500 | £42,000 |
Households exceeding these thresholds may still qualify via other benefits.
Popular questions
Who qualifies for a funded Internal Wall Insulation installation?
Households receiving income-related benefits or meeting ECO4 eligibility criteria may qualify for fully funded internal wall insulation.
How does Internal Wall Insulation work?
High-performance insulation boards or stud walls are fitted inside your property, reducing heat loss through solid walls and improving comfort.
Will I need to redecorate after installation?
Yes, some minor redecoration may be required due to indoor installation, especially if fixtures are moved.
Is Internal Wall Insulation suitable for listed buildings or conservation areas?
Yes, it is ideal for homes where external wall insulation is not possible.
How long does the installation take?
Installation time depends on property size but is generally quick and minimally disruptive.
What are the long-term benefits?
Lower energy bills, improved EPC rating, better comfort, and reduced carbon footprint.
