FREE Internal
Wall Insulation

Lewis & Harris

Free Internal Wall Insulation Lewis Harris

Envirohomes Renewables proudly stands as a beacon of expertise in internal wall insulation, particularly serving the Lewis Harris region in Scotland. Our reputation as a top-tier provider of home renewable services in Scotland is underscored by our understanding of the vital role that internal wall insulation plays in boosting energy efficiency and lowering energy bills for homeowners.

Our focus is dedicated to providing fully funded internal wall insulation services, intertwined with a range of renewable home solutions, especially aimed at supporting low-income households in receipt of benefits in the Lewis Harris area.


Our team in Lewis Harris comprises specialists in internal wall insulation, each demonstrating exceptional skill and professionalism. They are all accredited with the prestigious PAS 2030 certification, ensuring that every service we offer meets the highest standards of quality.

We have simplified the process of obtaining a free insulation grant in Lewis Harris, largely thanks to initiatives such as the Energy Company Obligation 4 (ECO4) scheme. This important government-backed program, continuing until March 2026, is committed to upgrading heating systems, lowering carbon emissions, tackling fuel poverty, and enhancing heating efficiency in homes across Scotland and the UK.

The ECO4 scheme’s dedication to promoting energy efficiency involves close collaboration with energy suppliers and local authorities in Lewis Harris. This cooperative approach is key in identifying households eligible for support, paving the way for a greener and more energy-efficient future in the region.

internal insulation

Who Is Eligible
For The Internal Wall Insulation Grant?

Envirohomes Renewables specializes in aiding eligible customers to obtain and set up home upgrades through the ECO4 program. This initiative predominantly supports households with low incomes and those in vulnerable situations, in line with the government's objectives to combat fuel poverty and reach carbon neutrality by the year 2050.
Here are the criteria needed to be eligible for this grant

ECO Scheme grant eligibility

  • Individuals with an annual income below £19,720.


  • Homeowners, private tenants, or recipients of social housing benefits.


  • Individuals receiving specific benefits such as Child Benefit, Income Support, etc.


  • Pensioners (aged 60 and above) receiving Pension Credit Benefits.


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

What Is Internal Wall Insulation?

Adding insulation inside external walls is a key method for improving a building’s energy efficiency. This process typically involves applying materials like rigid foam panels or mineral wool fibers to the inner surfaces of outer walls, usually with a thickness of 60 to 100 mm.

Installing this insulation significantly cuts down heat loss, leading to enhanced energy conservation and considerable savings in heating costs over time. It’s especially beneficial for buildings without cavity walls or those unsuitable for cavity wall insulation, helping to maintain consistent indoor temperatures and improve occupant comfort. Additionally, this can prolong the life of heating systems, making it a cost-effective solution for boosting energy efficiency and reducing long-term maintenance expenses.

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 an ideal solution for buildings with solid walls, designed to insulate the inside of external walls while considering the impact on room size and aesthetics.

  • Ideal for properties with solid walls, internal insulation involves using materials like rigid panels or mineral wool fibers, typically 60 to 100 mm thick, to insulate the inner side of external walls.

  • Significantly reduces heat loss, enhancing energy conservation and leading to considerable long-term savings on heating costs.

  • Particularly beneficial for buildings without cavity walls or where cavity wall insulation isn’t feasible, helping to maintain consistent indoor temperatures and occupant comfort.

  • Extends the lifespan of heating systems by reducing strain, thereby cutting down on long-term maintenance costs.

  • A strategic approach to improve energy efficiency and sustainability in buildings, contributing to both cost savings and environmental conservation.

Cavity Wall insulation is highly effective for buildings with such walls, improving heating efficiency with minimal impact.

  • Cavity wall insulation is ideal for enhancing heating efficiency in buildings with cavity walls, offering a solution with minimal disruption.

  • The process involves drilling small, precise holes in the walls to create access points for inserting insulation materials.

  • Insulation materials, such as mineral wool or foam, are injected into these holes, expanding to fill the cavity and improve heat retention.

  • Once insulation is complete, the access points are carefully sealed with plaster or a similar substance to maintain the property’s aesthetic integrity.

  • The overall process is designed to be quick and minimally invasive, ensuring limited disturbance to homeowners or building occupants.

Solid Wall insulation is specifically designed for older buildings that do not have cavity walls. It is applied externally to improve energy efficiency without changing the interior layout.

  • Older buildings lacking cavity walls, typically constructed before the 1920s, aiming to enhance energy efficiency while preserving the interior layout.

  • Various application methods, such as external cladding, rendering, or insulation boards, offer flexibility to accommodate different architectural designs.

  • By optimizing thermal control, solid wall insulation improves energy efficiency, resulting in increased occupant comfort and a more pleasant indoor environment.

  • This insulation type not only enhances functionality but also maintains the visual appeal and structural integrity of the building’s interior, ensuring a harmonious balance between practicality and aesthetics.

  • Despite its higher initial cost compared to internal insulation, solid wall insulation provides significant long-term benefits in terms of energy savings and enhanced comfort, making it a valuable investment for homeowners.

How Does Internal Wall Insulation Work?

What Are The
Advantages and Disadvantages

Of Internal Wall Insulation?

Advantages of internal wall insulation

  • Ideal for properties with solid walls.
  • Enhances energy efficiency and enhances comfort levels.
  • Decreases carbon footprint and lowers energy expenses.
  • May lead to a rise in property valuation.

Disadvantages of internal wall insulation

  • Minimized room space due to installation.
  • Disruption during the installation process.
  • Possible expenses if ineligible for grants.
  • Risks associated with improper installation, such as dampness or mold formation.

Note: Approval for any interior wall insulation grant or home improvement funding requires management by an approved installer (e.g., Envirohomes Renewables) under specific schemes (e.g., the ECO4 scheme).


If your household has a low income or does not receive benefits, you still have a chance to qualify for full funding under the ECO4 scheme. This funding can significantly improve your home’s energy efficiency, leading to reduced heating costs. Thus, even without benefits, you may still be eligible for a government insulation grant.

For homes constructed within the past 20 years, it’s likely that the walls are already insulated, along with other energy efficiency measures. To confirm this, certified installers can conduct a borescope inspection. They’ll create a small hole in the exterior wall to determine whether the walls are empty or insulated.

In addition to wall insulation, there are several strategies to reduce energy bills. These include turning off unused lights, adjusting the thermostat by 1 or 2 degrees, wearing warmer clothing indoors, using energy-efficient appliances, and minimizing hot water usage during showers, among other measures.

In Lewis Harris, Scotland, the Energy Saving Trust offers services and initiatives similar to those in other parts of the UK. It provides guidance, resources, and support to individuals, businesses, and organizations in Scotland, aiding them in reducing energy consumption, cutting energy bills, and decreasing carbon emissions.

Absolutely. Studies indicate that up to 45% of heat loss occurs through uninsulated solid walls, with an additional 25% of heat escaping through uninsulated roofs. This underscores the critical importance of properly insulating your walls.

In Lewis Harris, Scotland, our committed team specializes in delivering top-tier internal wall insulation services. With extensive experience and recognized credentials, including PAS 2030 certification, we ensure unmatched quality and complete client satisfaction.

We excel in assisting homeowners navigate the various insulation grant programs available in Scotland and throughout the UK. One notable program is the Energy Company Obligation 4 (ECO4) scheme, aimed at increasing accessibility to insulation solutions.

Supported by the government, the ECO4 scheme targets upgrading heating systems, reducing carbon emissions, and addressing fuel poverty. It prioritizes improving the energy efficiency of the least efficient homes in Lewis Harris and its surrounding areas.

Running until March 2026, the ECO4 scheme underscores the crucial need for enhancing energy efficiency. We collaborate closely with energy providers and local authorities to support eligible households in Lewis Harris in enhancing their home energy efficiency. This initiative is a significant step towards a more environmentally friendly and sustainable future.

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Registered office address: 12 Somerset Place, Glasgow, Scotland, G3 7JT.
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