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How Much Does External Wall Insulation Cost?

External wall insulation is an effective way to improve your home’s energy efficiency, reduce your carbon footprint, and increase the value of your property. However, the cost is one of the primary considerations when insulating your exterior walls.

Basically, the cost of external wall insulation can vary widely depending on factors such as the size and complexity of the property, the insulation, and the desired finish. So, how much does external wall insulation cost?

On average, external wall insulation costs between £100-£250 per square meter, including all other costs.

In this article, we will explore how much external wall insulation costs, including the factors that affect the cost, the benefits of external wall insulation, and how to finance this home improvement project. So, stay with us by reading the entire content.

What Is External Wall Insulation?

External wall insulation is a type of insulation that is applied to the exterior of a building’s walls rather than the interior.

It involves the installation of a layer of insulation material, such as expanded polystyrene (EPS), mineral wool, or cork, which is fixed to the outside of the walls, followed by a protective render or cladding.

Typically, external wall insulation helps to reduce heat loss from a building, improve its energy efficiency, and enhance its weather resistance. Apart from improving energy efficiency, it also improves the appearance and value of a property.

Which Factors Affect The Cost Of External Wall Insulation?

There are several factors to consider when estimating the external wall insulation cost. Here we’ve talked about some major factors that affect the cost of external wall insulation.

  • Insulation Materials: Different types of insulation materials, such as foam, mineral wool, or cork, can have varying costs.
  • Size Of The Property: The larger the property, the more materials and labour are required, which impacts the cost.
  • Access To The Property: The difficulty of accessing the property increases the cost of labour and equipment required for the wall installation.
  • Complexity Of The Property: The shape and design of the property impact the amount of insulation material needed and the difficulty of the installation.
  • Desired Finish: The cost of external wall insulation varies depending on the finish, such as brick slips or render, that is desired.

ProGuard Exteriors are your local experts for external wall insulation, exterior wall coatings, coloured render systems, and exterior painting for your home.

ProGuard Exteriors are your first choice for quality local workmanship throughout the South East of England.

Call us today on 0800 612 5254 to arrange a free quote or get in touch for more information on how to protect and transform your home!

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How Much Does External Wall Insulation Cost?

s we said earlier, the average external wall insulation cost varies depending on various factors. However, on average, the cost of external wall insulation can range from £100 to £250 per square meter.

It is important to note that the cost varies significantly depending on the project’s specific requirements, such as the type of finish desired, the accessibility of the property, and the size of the property.

A detailed quote from a professional insulation contractor is recommended to accurately determine your project’s cost.

How Can You Break Down The Cost Of External Wall Insulation?

The cost of external wall insulation can be broken down into several categories, including:

  • Cost Of Materials: This includes the cost of insulation materials such as EPS, mineral wool, polyurethane, phenolic foam, cork, or wood fibre.
  • Cost Of Labor: It includes the cost of installation, such as removing existing cladding, preparing the surface, and installing the insulation material.
  • Other Costs: Other costs include any additional costs such as scaffolding, disposal of waste materials, and cost of finish (such as render, brick slips, or paint).
How Much Does External Wall Insulation Cost?

Compare The Cost Of Different Types Of External Wall Insulation Materials

When considering external wall insulation, you should understand the cost differences between the available materials. Here is a cost comparison of some common types of external wall insulation materials:

  • Expanded Polystyrene (EPS): EPS is one of the most commonly used materials for external wall insulation. It is also one of the most affordable, with an average cost of around £120-£150 per square meter, including all necessary work processes and materials.
  • Mineral Wool: Mineral wool is another popular choice for external wall insulation. This material is slightly more expensive than EPS, with an average cost of around £140-£160 per square meter, including all necessary work processes and materials.
  • Wood Fibre Insulation: This insulation is made from recycled wood fibres and is sustainable and environmentally friendly. The average Wood fibre insulation cost is around £120-£160 per square meter, including all necessary work processes and materials.

How Can You Obtain Quotes And Hire A Professional Contractor For External Wall Insulation?

Obtaining quotes and hiring a professional contractor for external wall insulation seems daunting. Still, it’s important to take the time to find a reliable and experienced contractor who provides quality work at a reasonable price. Here’s an overview of the process:

1. Research And Compare

Start by researching different contractors in your area and comparing their services and prices. Look for contractors who specialise in external wall insulation and have a good reputation in the industry.

2. Request Quotes

Once you have a list of potential contractors, contact them to request quotes for your project. Ensure to provide detailed information about your property, including the size, insulation material you want to use, and any specific requirements.

3. Evaluate Quotes

After receiving quotes from several contractors, evaluate them carefully to determine which offers the best value for your money. Don’t just choose the cheapest option – consider factors like the quality of the materials, artistry, and the contractor’s experience and reputation.

4. Check Credentials

Before hiring a contractor, check their credentials, including their licences, insurance, and references from past clients. This helps you ensure that the contractor is qualified and reliable.

5. Sign A Contract

Once you have selected a contractor, sign a contract outlining the project’s scope, the materials and artistry, and the timeframe and payment schedule. It Will protect you and the contractor in case any disputes or issues arise during the project.

6. Monitor The Project

Finally, monitor the project’s progress to ensure that the work is being done according to the agreed-upon terms and to address any issues that may arise along the way. Stay in communication with the contractor and ask questions about the project if you have any concerns or questions.

Comparison Of Costs Of External Wall Insulation To Other Home Improvement Projects

Regarding home improvement projects, external wall insulation can be a significant investment. Here’s how it compares to the cost of other common home improvement projects.

  • Loft Insulation: Loft insulation is one of the most affordable home improvement projects, with an average cost of around £300-£500. This reduces energy bills and makes the home more comfortable but it doesn’t provide the same energy savings as external wall insulation.
  • Double Glazing: Double glazing is a popular home improvement project that improves energy efficiency and reduces noise levels. The average cost of double glazing is around £400-£600 per window, making it a more expensive option than loft insulation but still more affordable than external wall insulation.
  • Boiler Replacement: Replacing an old or inefficient boiler can be a significant investment, with an average cost of around £2,500-£4,000. However, it can help reduce energy bills and improve the home’s efficiency.
  • Solar Panels: Solar panels are a renewable option that reduces energy bills and provides a sustainable power source. The installation cost is high, with an average cost of around £5,000-£8,000 for a 4kW system.
  • External Wall Insulation: The cost of external wall insulation varies depending on a range of factors, including the type of insulation material, the size and complexity of the property, and the level of accessibility. On average, the cost of external wall insulation in the UK is around £8,000-£16,000 for a semi-detached house. While this is more expensive than other home improvement projects, it can provide significant energy savings and improve the home’s comfort.

Overall, external wall insulation is a significant investment, but it can provide long-term energy savings and improve the property’s overall value. Considering the cost and potential benefits when deciding whether to undertake this home improvement project is important.

How Does External Wall Insulation Benefit You In The Long Run?

There are several benefits to external wall insulation. Here we’ve talked about some key benefits of having external wall insulation.

  • Improved Energy Efficiency: External wall insulation can significantly reduce heat loss from the home, resulting in lower energy bills and a reduced carbon footprint.
  • Increased Comfort: By reducing heat loss, external wall insulation maintains a more consistent temperature within a home, resulting in increased comfort for occupants.
  • Noise Reduction: External wall insulation reduces noise transmission from outside, resulting in a quieter and more peaceful living environment.
  • Improved Home Value: External wall insulation increases the value of a home, making it a smart investment for homeowners.
  • Reduced Condensation: External wall insulation reduces condensation within a home, reducing dampness and mould issues.
  • Enhanced Appearance: External wall insulation enhances the appearance of a home, as it is finished with various decorative and protective coatings.

What Challenges And Risks Do You Face With External Wall Insulation Projects?

While external wall insulation provides many benefits, such as improved energy efficiency and lower heating bills, homeowners should know some potential challenges and risks before undertaking a project. Here are some of the main challenges and risks associated with external wall insulation:

Access and Scaffolding

External wall insulation require access to the outside of the home, which is challenging if obstacles such as trees, power lines, or neighbouring buildings exist. Additionally, scaffolding may be required to reach high or difficult-to-access areas.

Weather Conditions

External wall insulation is typically installed during mild and dry weather. Rain or snow during the installation process causes delays or damage to the insulation.

Building Regulations

External wall insulation projects must comply with local building codes and regulations. Failure to do so results in fines or legal problems.


External wall insulation can be a significant investment, and the cost can vary depending on the materials used, the size of the project and other factors. Homeowners should carefully consider the cost and potential benefits before undertaking a project.

Contractor Selection

Choosing a qualified and experienced contractor is critical to the project’s success. Homeowners should carefully research and vet potential contractors to ensure they have the expertise and experience to complete the project safely and effectively.

Risks To Existing Building Components

External wall insulation can damage building components such as windows, doors, and gutters. Homeowners should work with their contractors to identify and mitigate these risks before starting the project.

Which Mistakes Should You Avoid When Installing External Wall Insulation?

Installing external wall insulation can be a complex process, and there are several mistakes that homeowners can make that can lead to problems and additional costs down the road. Here are some common mistakes to avoid:

  • Choosing The Wrong Type Of Insulation: Several insulation materials are available, each with pros and cons. Choosing the wrong insulation will result in poor insulation performance, increased energy costs, or even damage to your home.
  • Failing To Prepare The Surface Properly: Proper surface preparation is critical to ensure that the insulation adheres properly and provides effective insulation. This includes cleaning, sanding, and repairing any cracks or damage to the wall.
  • Improper Installation: Proper insulation installation is key to ensuring its effectiveness. It involves using the right tools and techniques, following the manufacturer’s instructions, and ensuring the insulation is properly sealed to prevent air leaks.
  • Ignoring Building Codes And Regulations: Installing insulation requires compliance with local building codes and regulations to avoid fines, legal problems, or safety hazards. Ensure to obtain any necessary permits and follow all relevant regulations.
  • Not Hiring A Qualified Professional: Installing external wall insulation is a complex process that requires specialised knowledge and experience. Hiring an unqualified or inexperienced contractor leads to poor quality artistry, additional costs, and even safety hazards.
  • Focusing Solely On Cost: While cost is an important factor when installing external wall insulation, it should not be the only factor. Choosing the cheapest option results in poor quality materials or artistry.

Final Words

After reading the discussion above, we hope you get the answer to the question: How much does external wall insulation cost? External wall insulation is typically a valuable investment for homeowners, significantly improving a home’s energy efficiency and reducing energy costs.

The cost of external wall insulation varies depending on several factors, including the type of insulation, the size and complexity of the project, and the accessibility of the property.

However, it is important for homeowners to carefully evaluate their financing options and obtain quotes from professional insulation contractors to accurately determine the cost of their specific project.

With the right financing and professional installation, external wall insulation provides long-term energy savings and improves a home’s overall comfort and value.

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