What Is Solid Wall Insulation?

Enhance your living space and embrace a more sustainable lifestyle with ByEco's free solid wall insulation. Solid wall insulation is a crucial consideration for homeowners in the United Kingdom, particularly those residing in older properties where solid walls were commonly constructed. Unlike cavity walls, solid walls allow more heat to escape, making insulation a crucial step for enhancing energy efficiency. This process involves adding a protective layer either externally or internally, significantly reducing heat loss.
Solid walls are a typical feature of homes built before the 1920s. These walls, made of materials like brick or stone, lack the cavity present in modern walls, which acts as an insulative barrier. As a result, homes with solid walls can lose up to 45% of their heat through the walls, making them highly inefficient in terms of energy use. Insulating these walls is not only a matter of comfort but also an environmental imperative, especially as the UK government pushes towards its ambitious Net Zero targets by 2050.
Unlock Free Solid Wall Insulation: Are You Eligible?
Discover if you qualify for our free solid wall insulation services, for eligible homes, thanks to our partnership with the government through schemes like the ECO4 Scheme. This initiative is designed to help UK homeowners and tenants upgrade their home's energy efficiency at no charge. Do you want to know if you are eligible? Simply fill out our form to find out.
Types of Solid Wall Insulation

External Wall Insulation (EWI) and Internal Wall Insulation (IWI) are two main approaches, each tailored to different needs. Both methods have their advantages and are chosen based on factors such as cost, the structure of the house, and aesthetic preferences. Selecting the right type is key to optimising energy efficiency and comfort. Our experts will assess your home to suggest the best option that optimises energy efficiency and enhances the living comfort for you and your loved ones.
Understanding Internal Insulation for Solid Walls
Internal insulation involves fixing insulating materials to the inside of the walls. This process can be done using a variety of materials, such as rigid foam boards, mineral wool, or eco-friendly alternatives like wood fibre. These materials are chosen based on their insulative properties, ease of installation, and overall cost.
The installation process typically includes attaching insulation boards directly to the wall, then covering them with plasterboard. This method is particularly effective in reducing heat loss, as it creates a thermal barrier that prevents warm air from escaping through the walls.
Benefits of Internal Insulation for Solid Walls
Internal wall insulation offers numerous benefits that go beyond mere energy efficiency. By reducing heat loss, it significantly lowers energy bills, making it a cost-effective solution in the long run. Additionally, insulated homes maintain a more consistent indoor temperature, enhancing comfort during both the winter and summer months.
From an environmental perspective, internal insulation contributes to reducing the carbon footprint of a home. With the UK government’s commitment to reducing carbon emissions, insulating solid walls is a practical step towards achieving these goals. The environmental benefits are complemented by financial incentives, such as government grants, which further enhance the appeal of insulating solid walls.
Impact on Property Value and Aesthetics
Internal wall insulation can positively impact the value of your property. Homes with high energy efficiency ratings are increasingly attractive to buyers, especially as energy costs continue to rise. Additionally, a well-insulated home offers greater comfort, which is a significant selling point.
From an aesthetic perspective, internal insulation is often preferred because it does not alter the exterior appearance of the home. This is particularly important for listed buildings or homes in conservation areas where maintaining the original look is crucial.
Maintenance and Longevity of Internal Insulation
Once installed, internal insulation requires minimal maintenance. However, it’s essential to ensure that the walls remain dry, as moisture can compromise the insulation’s effectiveness. Regular inspections should be conducted to check for signs of dampness or damage.
The lifespan of internal insulation largely depends on the materials used. High-quality insulation can last for decades, providing long-term energy savings and comfort.
Environmental Impact of Solid Wall Insulation
The environmental benefits of insulating solid walls are significant. By reducing the amount of energy required to heat a home, internal insulation helps to lower carbon emissions. Additionally, choosing sustainable insulation materials can further reduce the environmental impact, contributing to the UK’s broader climate goals.
Proper disposal and recycling of insulation materials are also important considerations. Homeowners should work with contractors who follow best practices for waste management, ensuring that any old insulation materials are disposed of responsibly.
Costs and Eligibility
Under the ECO4 scheme (Energy Company Obligation), eligible homeowners and tenants may be able to receive solid wall insulation at no cost or at a significantly reduced cost, depending on their circumstances. The scheme is particularly focused on helping low-income, vulnerable, or fuel-poor households improve the energy efficiency of their homes.
Key Points Regarding Solid Wall Insulation Under ECO4
- Eligibility:
- Income-Related Benefits: If you or someone in your household receives specific income-related benefits (like Universal Credit, Income Support, or Pension Credit), you may qualify for solid wall insulation under the ECO4 scheme.
- Vulnerable Households: Even if you're not on income-related benefits, you might still qualify if your household is considered vulnerable or fuel-poor. This can include people with health conditions that are made worse by cold or those living in homes with low energy efficiency.
- Property Suitability: The property must be suitable for solid wall insulation. Homes with solid walls (as opposed to cavity walls) are typically less energy-efficient and can benefit significantly from insulation.
- Costs:
- Free Installation: If you fully qualify under the scheme, the solid wall insulation might be installed at no cost to you. This is common for households that meet the most stringent eligibility criteria.
- Partial Funding: Some households may need to pay a portion of the cost, especially if their circumstances don't fully meet the criteria for free installation. The extent of any required contribution can vary based on your specific situation, including your income level and the energy efficiency of your home.
- Funding Limitations:
- Solid wall insulation is more expensive than other types of insulation, such as cavity wall insulation. Because of this, even under the ECO4 scheme, there might be situations where full funding is not available, particularly if the cost is exceptionally high or if the property requires extensive work.
- Mixed Measures: Sometimes, to maximize energy savings, the scheme might offer a combination of insulation measures, and funding may be spread across these. In such cases, full funding for solid wall insulation might not be provided, and you might need to cover part of the cost.

Steps After Eligibility
- If you're a tenant: we coordinate with your landlord to ensure all contributions and permissions are in place.
- Home Assessment: Our assessors will visit to pinpoint the ideal energy solution for you.
- Scheduling Your Installation:We arrange installation at your convenience, using verified installers to do the job right.
Enhancing Your Home's Energy Efficiency Further
Beyond solid wall insulation, consider Cavity Wall Insulation to reduce your carbon footprint and energy bills. Installed correctly, they make your home warmer in winter and cooler in summer. Explore more energy-saving solutions that we offer.
Why Choose ByEco?

ByEco, your ally in renewable energy, under the ECO4 scheme offers the free solid wall insulation services, fully supported by the UK government and provided at no installation cost for eligible homes. We make sustainable living accessible, ensuring financial barriers don't stop you from improving your home's energy efficiency. With ByEco, every project contributes to a greener planet. Start your eco-friendly journey with us, free of charge.
Get Started with ByEco
Start your journey towards a greener and more energy-efficient home today. By beginning with a free consultation, we assess your needs and assist you in applying for our UK government-backed free solid wall insulation services. Improving your home’s energy performance not only contributes to a greener future but also potentially leads to decreased energy bills. To transform your property with our eco-friendly solutions at no cost to you, please fill out our form or contact us directly.