FREE Internal
Wall Insulation


Free Internal Wall Insulation Inverness

Envirohomes Renewables stands out as Scotland’s leading expert in internal wall insulation. As a prominent provider of home renewable services in Scotland, we recognize the critical role internal wall insulation plays in enhancing energy efficiency and reducing energy bills for homeowners.

Our primary focus lies in offering fully funded internal wall insulation services to low-income households receiving benefits in Scotland, made possible through the Government’s ECO 4 scheme.

With our team of highly trained installers holding industry accreditations such as PAS 2030 certification, we ensure the highest standards in all our projects.

Securing a free insulation grant in Scotland and the UK is now more accessible, thanks to schemes like the Energy Company Obligation 4 (ECO4) scheme. This government-backed initiative aims to upgrade heating systems to cut down carbon emissions and address fuel poverty while improving heating efficiency in homes across Scotland and the UK until March 2026.

internal insulation

Who Is Eligible
For The Internal Wall Insulation Grant?

Envirohomes Renewables aids qualifying individuals in accessing and executing various home enhancement projects under the ECO4 program, in line with governmental aims to tackle fuel poverty and attain carbon neutrality by 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 those in social housing.
    • Recipients of specific benefits such as Child Benefit, Income Support, etc.
    • People aged 60 and over who receive Pension Credit Benefits.
    • Properties with an Energy Performance Certificate (EPC) rating of D or lower.

What Is Internal Wall Insulation?

Internal wall insulation stands as a highly effective strategy for enhancing the energy efficiency of structures. It entails the application of insulation materials, commonly rigid insulation boards or mineral wool fibers, with thickness typically ranging from 60 mm to 100 mm, onto the inner surfaces of exterior walls.

By introducing an additional thermal barrier within the building framework, this technique significantly reduces heat loss, thereby contributing to improved energy conservation and decreased heating costs.

This insulation approach is especially advantageous for properties lacking cavity walls or where installing cavity wall insulation is not feasible. Additionally, internal wall insulation assists in better regulating indoor temperatures, enhancing the comfort of occupants, and potentially extending the lifespan of the building’s heating systems.

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 a customized method crafted for structures featuring solid walls. Its primary objective is to insulate the interior surfaces of the building, thereby markedly enhancing its thermal efficiency and capacity for energy conservation.

  • Insulation materials typically vary in thickness from 60 mm to 100 mm.


  • These materials may include rigid boards or mineral wool fibers.


  • Installing insulation may involve removing existing wall coverings, potentially affecting room size and aesthetics.


  • Internal wall insulation is generally a more cost-effective option compared to external wall insulation.

Cavity Wall insulation is designed specifically for properties that feature a cavity wall construction, comprising two distinct layers of walls separated by a gap or space.

  • Drilling Procedure: Commence by drilling holes in the walls to prepare for insulation material injection.
  • Material Injection: Inject insulation materials such as mineral wool or foam into the drilled holes, allowing them to expand and fill the cavity space effectively.
  • Covering Holes: Conceal access points with plaster or similar materials to maintain the property’s aesthetics post-installation.
  • Enhanced Heating Efficiency: Cavity wall insulation significantly boosts heating efficiency, leading to substantial long-term reductions in energy bills.
  • Efficient Installation: The installation process is typically swift, causing minimal disruption to homeowners or tenants.
  • Limited Disruption: Cavity wall insulation provides a convenient and efficient solution for enhancing home energy efficiency, with minimal disturbance during installation.

Solid wall insulating, is tailored for older or solid-wall properties and entails applying insulation to the exterior of the building.

  • Structures constructed before 1920 often lack wall cavities, making them suitable candidates for solid wall insulation.
  • Solid wall insulation offers various application methods, such as external cladding, rendering, or insulation board installation, providing adaptable solutions.
  • This approach effectively enhances energy efficiency and thermal regulation in solid wall buildings, thereby improving residents’ comfort levels.
  • Solid wall insulation maintains the integrity of interior living spaces and preserves the aesthetic appeal of properties, ensuring both functionality and visual appeal.
  • However, it’s important to note that solid wall insulation often involves higher costs compared to internal insulation options. Hence, homeowners should carefully budget before proceeding with this upgrade.

How Does Internal Wall Insulation Work?

What Are The
Advantages and Disadvantages

Of Internal Wall Insulation?

Advantages of internal wall insulation

  • It significantly enhances energy efficiency, leading to reduced energy consumption and lower utility bills.
  • With its superior insulation properties, it creates a warmer and more comfortable living environment, particularly noticeable during colder seasons.
  • By minimizing heat loss and optimizing thermal performance, it contributes to reducing the property’s carbon footprint, promoting environmental sustainability.
  • Installation of this solution can potentially increase the property’s value by improving its overall energy efficiency and comfort levels.
  • Additionally, by decreasing energy requirements, it qualifies for various financial incentives and support programs aimed at encouraging sustainable living practices.

Disadvantages of internal wall insulation

  • Reduction in available room space due to the installation of insulation.
  • Interruption experienced during the installation process.
  • Potential expenses incurred if ineligible for complimentary insulation grants.
  • Increased maintenance costs if insulation is improperly installed.
  • Risk of moisture and mold growth associated with insulation.

Note: Please be aware that approval for any interior wall insulation grant or home improvement funding necessitates management by an authorized installer, like Envirohomes Renewables, within the parameters of the designated scheme, such as the ECO4 scheme.


Even if you’re not receiving benefits, you may still qualify for a government insulation grant if your household has a low income. These grants aim to improve energy efficiency and reduce heating expenses for eligible homeowners.

Homes built in the last 20 years likely have cavity wall insulation. Certified installers can perform inspections to confirm insulation presence through borescope inspections.

Besides insulation, energy-saving practices like switching off unused lights, lowering thermostat settings, and opting for energy-efficient appliances can help reduce energy bills.

The Energy Saving Trust in Inverness provides guidance and support to individuals, businesses, and organizations to reduce energy consumption, lower bills, and cut carbon emissions.

Yes, proper wall insulation is crucial for preventing heat loss, especially in solid walls where up to 45% of heat can escape without insulation.

In Inverness, our dedicated team of specialists in internal wall insulation brings a wealth of expertise and experience to each project. With thorough training and industry accreditations, including the prestigious PAS 2030 certification, we uphold rigorous standards to ensure the highest quality of workmanship, fostering confidence and reliability in our services.

Securing a free insulation grant in Scotland and the UK is a streamlined process, thanks to tailored schemes designed to meet homeowners’ requirements. Among these initiatives, the Energy Company Obligation 4 (ECO4) scheme emerges as a notable and accessible program.

Endorsed by governmental authorities, the ECO4 scheme represents a comprehensive effort aimed at modernizing heating systems to combat carbon emissions and address fuel poverty. With a specific focus on upgrading heating systems in the least energy-efficient homes across Scotland and the wider UK, its primary objective is to enhance overall energy efficiency.

Scheduled to continue until March 2026, the ECO4 scheme places a premium on advancements in energy efficiency. By collaborating with energy suppliers and local authorities, eligible households are identified and provided with essential support and resources to facilitate home upgrades.

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