FREE Internal
Wall Insulation

Free Internal Wall Insulation Scotland

Envirohomes Renewables are considered Scotland’s internal wall insulation experts. Being one of Scotland’s biggest home renewable service providers, we understand the vital role that internal wall insulation plays in making your home more energy efficient and, crucially, in lowering your energy bills.

We currently focus on providing fully funded internal wall insulation in conjunction with other home renewable services to low-income households on benefits in Scotland. We provide this fully funded service through the Government’s ECO 4 scheme.

Our highly trained internal wall insulation installers have achieved all the relevant industry accreditations, including the PAS 2030 certification. Thus, you can be assured that we carry out all jobs to the highest possible standards.

Getting a free insulation grant in Scotland and the UK is relatively easy. Currently, one of the largest schemes running is the Energy Company Obligation 4 (ECO4) scheme.

The government-backed ECO4 scheme is a UK programme that is focused on upgrading heating systems to reduce carbon emissions. Simultaneously, it also aims to address fuel poverty and improve the heating systems of the least energy-efficient homes across Scotland and the rest of the UK.

It is scheduled to run until March 2026 with an emphasis on energy efficiency. It involves collaborating with energy suppliers and local authorities to identify eligible households.  
internal insulation

Who Is Eligible
For The Internal Wall Insulation Grant?

Envirohomes Renewables helps eligible customers secure and install various home improvement upgrades through the ECO4 scheme. This scheme predominantly focuses on low-income and vulnerable households, working towards the government’s fuel poverty commitments and goal of becoming carbon-neutral by 2050.

Here are the criteria needed to be eligible for this grant

ECO Scheme grant eligibility

  • Individuals who have an income less than £19,720 per annum.

  • Homeowners, private tenants, or those on social housing benefits.

  • Individuals who receive certain benefits, such as Child Benefit, Income Support, etc.

  • Pensioners (over 60) who receive Pension Credit Benefits.

  • Homes that have an Energy Performance Certificate (EPC) rating of D or lower.

What Is Internal Wall Insulation?

Internal wall insulation is a home improvement technique that involves adding 60 mm to 100 mm of insulation materials (i.e. rigid insulation boards usually made up of plasterboard or mineral wool fibres) to the inside surfaces of external walls within a property. This is done to reduce heat loss.

This energy-efficient insulation method is generally cheaper than external wall insulation. It is also ideal for properties that may not have a cavity wall or where cavity wall insulation is not feasible.

What is the difference between
internal wall, cavity wall and solid wall insulation?

While all these insulating techniques serve as energy efficiency improvements, they do vary slightly in their function and application.

Internal insulation is designed for properties with solid walls but focuses on insulating the interior (inside) walls of the building.

    • Insulating materials are roughly 60 mm – 100 mm thick, usually in the form of rigid insulation boards or mineral wool fibres.
    • It may require the removal of existing wall coverings to install the insulation materials.
    • The end result is visible on the inside of the property, potentially affecting room sizes and aesthetics.
  • It is generally cheaper to install than external wall insulation.

Cavity Wall insulation is designed for properties with cavity walls. Cavity walls consist of two layers, an outer and an inner wall with a gap between the two. This ‘gap’ is called a cavity and it is filled with insulating materials to improve the warmth of homes and save energy.

• Walls are first drilled and cavity wall insulation materials, such as mineral wool or foam, are injected through the holes. These materials usually expand to fill up the cavity space.

• The access holes are then covered up with plaster or the like to match the aesthetics of the property.

• Cavity wall insulation improves heating, reduces energy bills and enhances the efficiency of energy in homes.

• Cavity wall insulation is generally quicker to complete, causing less disruption to homeowners and tenants.

Solid wall insulating, on the other hand, is specifically designed for older builds or solid wall properties – that have no cavity wall – and is applied to the outside/exterior of the building.

  • Homes built before 1920 usually have solid walls.

  • Solid wall insulation can be applied in different ways, such as with external cladding, rendering (plastering) or insulation boards.

  • It is an effective method to improve energy and thermal regulation of solid wall properties.

  • The end result does not impact interior living spaces or aesthetics.

It is generally more expensive than internal insulation.

How Does Internal Wall Insulation Work?

What Are The
Advantages and Disadvantages

Of Internal Wall Insulation?

Advantages of internal wall insulation

  • Suitable for solid wall properties
  • Improved energy efficiency
  • Enhanced warmth and comfort
  • Reduced carbon footprint
  • Increased property value
  • Aids in financial support by reducing energy needs

Disadvantages of internal wall insulation

  • Reduction room space
  • Disruption during the installation process
  • Can be costly – if you do not meet the eligibility criteria for a free insulation grant
  • Increased maintenance costs can be incurred if the insulation installed is not done correctly by trained professionals
  • Dampness/mould growth

Note: For any interior wall insulation grant or home improvement funding to be approved, it must be managed by an approved installer (such as Envirohomes Renewables) by the specific scheme (such as the ECO4 scheme).


If your household has a low income or receives benefits, there’s a good chance you can receive full funding for free insulation through the ECO4 scheme. This funding can help make your home more energy-efficient, leading to reduced heating expenses. This means that even if you don’t receive benefits, you may still qualify for a government insulation grant.

If your home was built in the past 20 years, it’s likely the walls are already insulated (as well as having other energy efficiency measures). To confirm this, you can consult certified installers to perform a borescope inspection. They will make a small hole in the exterior wall to determine if the walls are empty or insulated.

Apart from wall insulations, you can reduce your energy bills in several ways. These include switching off lights that are not in use, reducing the thermostat by 1 or 2 degrees, opting to wear jumpers/socks indoors switching to energy-efficient A-grade appliances and having shorter showers to conserve hot water usage – to name a few.

In Scotland, the Energy Saving Trust offers similar services and initiatives as it does in other parts of the UK. It provides advice, information and support to individuals, businesses and organisations in Scotland to help them reduce energy consumption, lower energy bills and reduce carbon emissions.

Yes. Statistics show that up to 45% of heat can be lost through uninsulated solid walls, while an additional 25% of heat can be lost through an uninsulated roof. This just goes to show how important it is to have your walls properly insulated.

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Registered office address: 12 Somerset Place, Glasgow, Scotland, G3 7JT.
Company No: SC708370. VAT No:396823742