FREE Internal
Wall Insulation


Free Internal Wall Insulation Lothians

Envirohomes Renewables is at the forefront of providing expert internal wall insulation Lothians solutions. As one of the most significant renewable service providers in Scotland, we deeply understand the crucial role of internal wall insulation in elevating home energy efficiency and significantly reducing energy costs.

Our efforts are currently channeled into offering fully funded internal wall insulation services, particularly aimed at supporting low-income households in Scotland, through the Government’s progressive ECO 4 scheme.

In Lothians, our team of internal wall insulation specialists stands out for their exceptional skill and professionalism. Each member is accredited with the renowned PAS 2030 certification, ensuring top-tier quality in every service we provide.

The journey to obtaining a free insulation grant in Lothians has been made more accessible and efficient, thanks to programs like the Energy Company Obligation 4 (ECO4) scheme. This pivotal government-endorsed initiative, set to continue until March 2026, focuses on transforming heating systems, reducing carbon footprints, tackling fuel poverty, and upgrading the overall heating efficiency in homes across Scotland, including the wider UK.

The ECO4 scheme, with its commitment to fostering energy efficiency, works in tandem with energy providers and local authorities in Lothians. This collaborative effort is key in identifying households that qualify for support, setting a foundation for a greener, more energy-efficient future in the region.

internal insulation

Who Is Eligible
For The Internal Wall Insulation Grant?

Envirohomes Renewables is dedicated to helping eligible clients access and implement various home improvement measures under the ECO4 scheme. This scheme is a cornerstone in the government's strategy to combat fuel poverty and move towards a carbon-neutral future by 2050.
Here are the criteria needed to be eligible for this grant

ECO Scheme grant eligibility

  • People earning less than £19,720 per year.


  • Those living in a house, regardless of whether they own it, rent it, or live in social housing.


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


  • Seniors aged 60 or older who receive Pension Credit.


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

What Is Internal Wall Insulation?

Internal wall insulation has emerged as a crucial strategy to increase the energy efficiency of buildings. This method entails attaching insulating materials, such as rigid boards or mineral wool fibers, to the interior surfaces of external walls, with these materials usually being between 60 and 100 mm in thickness.

By integrating this additional layer of insulation within the building, there’s a significant decrease in heat loss. This leads not only to enhanced energy preservation but also to a notable reduction in heating costs in the longer term.

Particularly advantageous for structures that do not have cavity walls or where cavity wall insulation is not feasible, this approach of insulation aids in stabilizing indoor temperatures, thereby elevating the comfort level for occupants. Moreover, internal wall insulation can extend the lifespan of a building’s heating systems, making it a wise investment for both energy efficiency and long-term building maintenance.

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 tailored for solid wall properties, focusing on insulating interior walls, impacting room sizes and aesthetics.

  • Insulation materials used for internal wall insulation are generally between 60 mm and 100 mm thick and typically consist of either rigid boards or mineral wool fibers.
  • The installation process may involve the removal of current wall coverings to ensure the insulation is placed correctly.
  • This enhancement can have visible effects within the property, possibly altering the dimensions and appearance of rooms.
  • Compared to external wall insulation, internal wall insulation is often a more budget-friendly option for boosting energy efficiency.

Cavity Wall insulation is suited for properties with cavity walls, enhancing heating efficiency with minimal disruption.

  • Drilling precise holes into the walls marks the start of the insulation process.
  • Insulation material, such as mineral wool or foam, is injected into these holes, expanding to fill the cavity space effectively.
  • The holes are then seamlessly sealed with plaster or a similar substance, preserving the appearance of the property.
  • This insulation method greatly enhances heating efficiency, leading to significant and enduring reductions in energy costs.
  • The installation process is quick and causes minimal disturbance to homeowners or tenants.
  • Cavity wall insulation is designed for convenience, with minimal disruption during installation, focusing on the comfort of the homeowner.

Solid Wall insulating is designed for older builds devoid of cavity walls, applied externally to improve energy efficiency without altering interior spaces.

  • Older buildings, especially pre-1920s, often have solid walls without cavities, making them suitable for solid wall insulation.
  • Solid wall insulation can be applied using various methods like external cladding, rendering, or insulation boards, tailored to different building styles.
  • This insulation improves energy efficiency and thermal control, enhancing occupant comfort and creating a more pleasant living environment.
  • It preserves the building’s interior integrity and aesthetic appeal, ensuring a balance between functionality and appearance.
  • Solid wall insulation is generally more expensive than internal insulation due to extra material and labor costs for external application.

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
  • Enhanced energy efficiency and comfort
  • Reduced carbon footprint
  • Increased property value
  • Financial support through energy savings

Disadvantages of internal wall insulation

  • Reduction in room space
  • Disruption during the installation process
  • Potential costs if ineligible for free insulation grants
  • Increased maintenance costs if installation is not done correctly
  • Risk of dampness/mould growth

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 doesn’t receive benefits or has a low income, you may still be eligible for full funding under the ECO4 scheme, facilitating free insulation.

This support enhances your home’s energy efficiency, leading to decreased heating costs, making government insulation grants accessible beyond benefit recipients.

For homes constructed within the last two decades, insulation, along with other energy efficiency measures, is probable.

To verify, certified installers can conduct a borescope inspection. By making a small hole in the exterior wall, they ascertain whether the walls are insulated or empty.

Aside from wall insulation, numerous methods can lower energy bills.

These encompass actions such as turning off unused lights, adjusting the thermostat slightly lower, wearing warmer clothing indoors, transitioning to energy-efficient appliances, and minimizing hot water usage during showers.

In Lothians, the Energy Saving Trust mirrors its services and initiatives elsewhere in the UK.

It furnishes guidance, resources, and backing to individuals, businesses, and organizations across Scotland, aiming to curtail energy consumption, diminish energy expenses, and cut down carbon emissions.

Wall insulation is indispensable.

Research indicates that uninsulated solid walls can account for up to 45% of heat loss, while an additional 25% of heat loss can arise from uninsulated roofs.

These figures underscore the critical importance of adequately insulating your walls.

In the Lothians, our team specializes in delivering superior internal wall insulation services. With our wealth of experience and credentials, including PAS 2030 certification, we assure outstanding quality and customer satisfaction.

We also assist homeowners in navigating various insulation grant programs available in Scotland and the wider UK. A prominent initiative is the Energy Company Obligation 4 (ECO4) scheme, which provides accessible insulation solutions.

Backed by government support, the ECO4 scheme aims to upgrade heating systems, reduce carbon emissions, and address fuel poverty. Its focus lies in enhancing energy efficiency within the least efficient homes across the Lothians and beyond.

Running until March 2026, the ECO4 scheme underscores the significance of bolstering energy efficiency. We collaborate closely with energy providers and local authorities to aid eligible households in the Lothians in enhancing their homes’ energy efficiency, contributing to a more sustainable future.

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