Home & Commercial Insulation

External Wall Insulation (EWI)

External Wall Insulation (EWI) is a system of insulating material applied to the exterior walls of a building to improve its thermal efficiency.

External Wall Insulation

What is External Wall Insulation?

This process involves fixing insulation boards to the outside walls, and then covering them with a protective, decorative render or cladding.

EWI helps to reduce heat loss, lower energy bills, and improve indoor comfort by maintaining a consistent temperature. It also provides additional benefits such as enhancing the building’s appearance, reducing condensation, and protecting the exterior walls from weather damage.

This insulation method is particularly effective for older buildings with solid walls that lack cavity walls for internal insulation.

Why do you need to insulate your external walls?

Benefits of Insulating your External Walls?

Improve Energy Efficiency

Insulating external walls significantly reduces heat loss, leading to improved energy efficiency. This means your home stays warmer in winter and cooler in summer, resulting in lower energy consumption and reduced utility bills.

Increased Comfort

External wall insulation helps maintain a consistent indoor temperature by minimising drafts and cold spots. This creates a more comfortable living environment, ensuring that all rooms are warm and cosy throughout the year.

Weather Protection

External wall insulation provides an additional layer of protection against the elements. It helps shield your walls from rain, wind, and temperature fluctuations, preventing issues such as damp, mould, and structural damage, thereby extending the lifespan of your home.

Home Value

Adding external wall insulation can boost the value of your property. Energy-efficient homes are highly attractive to potential buyers, and the improved appearance and reduced energy costs can make your property stand out in the market.

The Importance

Why do you need External Wall Insulation?

Older Properties

Many older buildings were constructed without cavity walls, making them more prone to heat loss and less energy-efficient. By adding external insulation, these properties can significantly improve their thermal performance, reducing heating costs and enhancing comfort levels for occupants.


External wall insulation acts as a protective barrier for the building envelope. It helps to shield the walls from weather elements such as rain, wind, and temperature fluctuations, which can otherwise cause damage and deterioration over time.


External wall insulation is essential for older properties seeking to improve energy efficiency, address structural issues, and enhance visual appeal, thereby ensuring sustainable and comfortable living environments for years to come.


Cavity Wall Insulation
Cavity Wall Insulation
Read More
Good work all round, all questions answered promptly and thoroughly, folks knew their stuff and were careful to check the best possible result given existing bits of broken polystyrene in the back wall. Larger than average 3 bed semi done in about 3.5 hours once they were set up. More aesthetic than practical, but I was particularly pleased with how well they matched the morter to the existing one for filling the holes at the end of the job. 25 year warantee was a particularly nice touch. Came sooner than booked due to a cancellation which was a bonus. Really noticing the difference already.
Cavity Wall Insulation
Cavity Wall Insulation
Read More
Absolute perfection. Courteous, cleaned up after. Explained procedure and very efficient all round
Cavity Wall Insulation
Cavity Wall Insulation
Read More
The 2 engineers did an excellent job of keeping the drilling holes to a minimum and cleaned up very well afterwards. In addition to the cavity wall insulation, they also had to fit a new vent due to our wood burner in the living room. They checked with us throughout the project that we were happy with what they were doing and asked for feedback at the end. Very professional and polite guys. We will hopefully learn over the hot summer and cold winter how effective the work has been. Well done team!
Cavity Wall Insulation
Cavity Wall Insulation
Read More
Terry Dunford did the surveying for our property he was very knowledgeable and gave very good advice which we check and was correct in everything he said. The men who came do the cavity wall insulation were also very good, they respected us and our home,they explained what they were going to do and warned us about the noise. They cleared up after they had completed the work and asked us to check that we were happy with the way they had left our property which we were. We would highly recommend this company to anyone thinking of having any cavity wall insulation done .
External Wall Types

Do I Have a Solid Wall or a Cavity Wall?

Determining whether your property has an external solid wall or a cavity wall can usually be done through a few straightforward methods:

1. Age of Property:

Pre-1920 homes were typically built with solid external walls.

2. Exterior Appearance

If the external walls appear uniform and without visible gaps or patterns in the brickwork, it is likely to be a solid wall.

3. Drilling Inspection

If unsure, a professional can drill a small hole in an inconspicuous area of the external wall to inspect its construction.

4. Professional Survey

For accurate assessment and advice tailored to your property, consider hiring a professional surveyor or insulation specialist.

Expert Installers



Contact Eco Systems today at 0203 411 4885 for expert guidance in selecting the ideal external wall insulation solution for your needs.

Benefit from stress-free installation and exceptional aftercare services, ensuring top-quality results and optimal energy efficiency.

Fill out our contact form to embark on your energy-saving journey with confidence.

EWI Insulation

Frequently Asked Questions

External wall insulation involves adding a layer of insulating material to the exterior walls of a building. This improves thermal efficiency, reduces heat loss, and enhances the building’s overall energy performance.

Benefits include enhanced comfort, lower energy bills, increased property value, additional living space, improved energy efficiency, and reduced carbon footprint.

Benefits include improved energy efficiency, reduced heating costs, enhanced thermal comfort, protection of the building structure from weather elements, and potential increases in property value and aesthetic appeal.

Most properties with solid walls or those with insufficient cavity walls can benefit from external wall insulation. It’s essential to assess factors such as wall condition, planning regulations, and the availability of suitable installation methods.

Installation involves fixing insulation boards to the exterior walls, followed by applying a protective render or cladding. The process may also include preparatory steps like surface cleaning, fixing anchors, and ensuring proper ventilation.

EWI offers a variety of finishes and colors, allowing you to enhance the aesthetic appeal of your property. It can modernize the exterior while also providing functional benefits such as weatherproofing and improved insulation.

The UK government have many insulation funding schemes which may mean that you can get a fully funded or partially funded insulation service for your external wall. Contact us about external wall insulation funding to find out more.

Information HUB

Latest News & Insulation Information