FREE Internal
Wall Insulation


Free Internal Wall Insulation Highlands

Envirohomes Renewables stands as Highland’s leading authority in internal wall insulation, dedicated to bolstering energy efficiency and alleviating financial burdens for homeowners across the Highlands.

Our unwavering commitment stems from a profound understanding of the pivotal role played by internal wall insulation in fostering sustainable living environments. As a trusted provider, we are deeply invested in enhancing the quality of life for residents while simultaneously contributing to nationwide efforts aimed at reducing carbon emissions.

Envirohomes Renewables spearheads initiatives to provide fully funded internal wall insulation services to low-income households throughout the Highlands. Through our active participation in the Government’s ECO 4 scheme, we ensure that eligible homeowners have access to premium insulation solutions without bearing any financial burden.

By aligning with governmental objectives to combat fuel poverty and promote environmental sustainability, we strive to create a more equitable and energy-efficient society.

internal insulation

Who Is Eligible
For The Internal Wall Insulation Grant?

Envirohomes Renewables assists eligible individuals in obtaining and implementing a range of home improvement upgrades through the ECO4 initiative, aligning with governmental objectives to combat fuel poverty and achieve carbon neutrality by 2050.
Here are the criteria needed to be eligible for this grant

ECO Scheme grant eligibility

    • Individuals making under £19,720 per year.
    • Homeowners, renters in private accommodations, or residents in social housing.
    • Recipients of particular benefits such as Child Benefit, Income Support, etc.
    • Individuals aged 60 and over who receive Pension Credit Benefits.
    • Dwellings with an Energy Performance Certificate (EPC) rating of D or below.

What Is Internal Wall Insulation?

Internal wall insulation is a highly efficient approach utilized to boost the energy efficiency of buildings. It involves applying insulation materials, typically rigid insulation boards or mineral wool fibers, ranging in thickness from 60 mm to 100 mm, onto the inner surfaces of external walls.

By establishing an extra thermal barrier within the building structure, this method substantially diminishes heat loss, thus aiding in enhanced energy preservation and reduced heating expenses.

This insulation method proves particularly beneficial for properties without cavity walls or where installing cavity wall insulation is impractical or unfeasible. Furthermore, internal wall insulation aids in better regulating indoor temperatures, enhancing occupants’ comfort, and potentially prolonging 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 tailored technique designed for buildings with solid walls. It focuses on insulating the inner surfaces of the structure, significantly boosting its thermal efficiency and energy-saving potential.

  • Insulation materials typically range from 60 mm to 100 mm in thickness.
  • These materials can be either rigid boards or mineral wool fibers.
  • Installation of insulation may necessitate removing existing wall coverings, potentially impacting room size and aesthetics.
  • Internal wall insulation is generally more cost-effective compared to external wall insulation.

Cavity Wall insulation is specifically intended for properties characterized by the presence of a cavity wall construction, which consists of two separate layers of walls with a gap or space existing between them.

  • Drilling of Holes: Begin by drilling holes in the walls for insulation material injection.
  • Material Injection: Inject insulation materials (e.g., mineral wool, foam) into the drilled holes, allowing them to expand and fill the cavity space.
  • Hole Covering: Cover access holes with plaster or similar material to maintain the property’s aesthetics post-installation.
  • Heating Efficiency: Cavity wall insulation enhances heating efficiency, resulting in long-term energy bill reductions.
  • Quick Installation: Installation is typically fast, causing minimal disruption to homeowners or tenants.
  • Minimal Disruption: Cavity wall insulation offers a convenient, efficient option for energy-efficient home upgrades, with little disturbance during installation.

Solid wall insulating, is designed specifically for older or solid-wall properties, involving the application of insulation to the building’s exterior.

  • Structures constructed before 1920 typically lack wall cavities, making them ideal 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 improves energy efficiency, thereby reducing energy consumption and lowering utility bills.
  • With its enhanced insulation properties, it creates a cozier and more comfortable living environment, especially during colder seasons.
  • By minimizing heat loss and optimizing thermal performance, it helps lower the property’s carbon footprint, contributing positively to environmental sustainability.
  • The installation of this solution can potentially increase the value of the property, as it enhances its overall energy efficiency and comfort levels.
  • Additionally, by decreasing energy requirements, it not only saves money but also qualifies for various financial incentives and support programs aimed at promoting sustainable living practices.

Disadvantages of internal wall insulation

  • Decrease in available room area.
  • Interruption during installation process
  • Possible expense if not eligible for complimentary insulation grant
  • Higher maintenance costs if insulation is incorrectly fitted
  • Risk of moisture and mold development.

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.


Eligibility for insulation grants under the ECO 4 scheme extends beyond benefit recipients, encompassing households with low incomes and specific property characteristics in the Highlands.

Our team provides guidance to homeowners, ensuring that all eligible individuals can access vital support.

Envirohomes Renewables offers professional inspection services to ascertain the presence of cavity wall insulation in homes across the Highlands.

Through advanced techniques such as borescope examinations, we provide homeowners with accurate assessments, enabling informed decisions regarding insulation upgrades.

Beyond insulation, homeowners in the Highlands can implement various energy-saving measures, including lighting optimization, thermostat adjustments, and appliance upgrades.

Our experts offer personalized recommendations to help households minimize energy consumption and maximize cost savings.

The Energy Saving Trust serves as a valuable resource for residents of the Highlands, offering guidance, support, and educational initiatives to promote energy efficiency and sustainability.

Through collaborative efforts with organizations like Envirohomes Renewables, the Trust plays a crucial role in advancing environmental objectives.

Given the substantial heat loss associated with uninsulated walls, internal wall insulation emerges as a vital investment for homeowners in the Highlands.

By enhancing energy efficiency and reducing environmental impact, insulation measures contribute to creating healthier and more sustainable living environments.

Our team of experts specializing in internal wall insulation in the Highlands brings extensive knowledge and experience to each project. With rigorous training and industry certifications, including the esteemed PAS 2030 accreditation, we ensure that every job meets high standards, fostering trust and dependability in our services.

Obtaining a free insulation grant in Scotland and the UK is a straightforward process, thanks to tailored schemes catering to homeowners’ needs. Among these, the Energy Company Obligation 4 (ECO4) scheme stands out as a prominent and accessible program.

Endorsed by the government, the ECO4 scheme represents a comprehensive initiative aimed at modernizing heating systems to combat carbon emissions and tackle fuel poverty. Specifically targeting the improvement of heating systems in the least energy-efficient homes across Scotland and the wider UK, its primary goal is to enhance overall energy efficiency.

Running until March 2026, the ECO4 scheme prioritizes advancements in energy efficiency. Through collaborations with energy suppliers and local authorities, eligible households are identified and provided with necessary support and resources to facilitate upgrades to their homes.

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