Improving your home’s energy efficiency is essential for reducing heating costs and maintaining a comfortable indoor environment. One of the most effective ways to enhance insulation in older properties is through internal wall insulation (IWI). However, insulation upgrades can be expensive, which is why the Internal Wall Insulation Grant is a fantastic opportunity for homeowners to receive government funding.

This guide covers everything you need to know about internal wall insulation grants, including eligibility, benefits, and how to apply.

What is an Internal Wall Insulation Grant?

The Internal Wall Insulation Grant is part of the UK government’s Energy Company Obligation (ECO4) scheme and the Great British Insulation Scheme. These programs provide financial assistance to help homeowners and tenants install energy-efficient insulation, reducing heat loss and lowering energy bills.

Internal wall insulation involves adding an insulating layer to the inside of external walls, which is particularly useful for solid wall properties that lack cavity insulation.

Benefits of Internal Wall Insulation

• Lower Energy Bills – Can reduce heating costs by up to £500 per year.

• Increased Energy Efficiency – Helps maintain a consistent indoor temperature.

• Government-Funded Support – Eligible households may receive free or subsidized insulation.

• Reduced Carbon Emissions – Contributes to the UK’s net-zero targets.

• Better Home Comfort – Eliminates cold spots and improves thermal performance.

• Enhanced Property Value – Increases EPC (Energy Performance Certificate) ratings.

Who is Eligible for the Internal Wall Insulation Grant?

To qualify for an internal wall insulation grant, applicants must meet specific criteria:

1. Property Type – Must have solid external walls with no existing cavity insulation.

2. Homeownership or Rental Status – Available to homeowners, private tenants, and landlords (landlord approval required).

3. Receiving Government Benefits – Higher chances of eligibility if receiving:

   • Pension Credit

   • Universal Credit

   • Housing Benefit

   • Income Support

   • Child Tax Credit

   • Working Tax Credit

   • Personal Independence Payment (PIP)

4. Low-Income Households – Some grants apply to homes with an annual income below £31,000.

5. Energy Performance Certificate (EPC) Rating – Priority given to homes rated E, F, or G.

6. Off-Gas Grid Homes – Extra support for homes that rely on electric heating, oil, or LPG.

How Much Funding is Available?

The cost of internal wall insulation typically ranges from £4,000 to £15,000, depending on property size and insulation type. With the ECO4 scheme and the Great British Insulation Scheme, eligible households can receive fully funded or heavily subsidized insulation.

How to Apply for an Internal Wall Insulation Grant

1. Check Your Eligibility – Use an online eligibility checker or contact an approved installer.

2. Arrange a Free Home Assessment – An assessor will evaluate your home’s insulation needs.

3. Submit an Application – Your installer will handle the grant application process.

4. Approval and Installation – Once approved, a professional installer will fit the insulation.

5. Enjoy Energy Savings – Experience lower heating costs and improved home efficiency.

Types of Internal Wall Insulation

There are two primary methods for internal wall insulation:

• Insulated Plasterboard (Dry Lining) – A quicker, less invasive solution using pre-insulated boards fixed to the walls.

• Stud Wall Insulation – Involves constructing a new insulated wall with a timber or metal framework.

Additional Support for Energy Efficiency

Apart from internal wall insulation grants, you may also be eligible for:

• External Wall Insulation Grants – Covers the cost of adding insulation to the outside of your home.

• Loft Insulation Grants – Helps prevent heat loss through the roof.

• Underfloor Insulation Grants – Reduces heat loss from the ground floor.

• Boiler Replacement Scheme – Assists with upgrading to an energy-efficient boiler.

• Air Source Heat Pump Grants – Provides funding for renewable heating solutions.

Choosing a Government-Approved Installer

To qualify for a government insulation grant, you must use an approved installer who is:

• ECO4-accredited

• TrustMark registered

• PAS 2030/2035 certified (for insulation work)

• MCS certified (for renewable energy systems)

Conclusion

The Internal Wall Insulation Grant is an excellent opportunity for homeowners to improve energy efficiency, reduce heating costs, and enhance home comfort. With ECO4 funding and the Great British Insulation Scheme, eligible households can receive free or subsidized insulation to make their homes warmer and more energy-efficient.