External Wall Insulation (EWI)

External Wall Insulation (EWI)

Reduces heating bills by up to 45%.

Reduces carbon footprint by cutting Co2 emissions.

Improves the air-tightness of a building.

External Wall Insulation (EWI)

How it Works

(EWI) is one of the fastest-growing solutions in the rendering and insulation industry, particularly for older properties with solid walls. It involves fixing insulated panels to the outside of a property, which are then finished with a durable and decorative render system.

This approach improves thermal efficiency, reduces heat loss, and transforms the external appearance of your home.

A Modern Insulation & Rendering System

How it Works

EWI works by attaching rigid insulation boards to the external walls of your property. These are then finished with a choice of high-quality render systems, including:

Monocouche render (a through-coloured, single-layer render)
Acrylic or silicone thin-coat render systems

By insulating from the outside, we avoid the major disruption associated with internal insulation, meaning no loss of internal space and no need to redecorate inside your home.

Minimal Disruption, Maximum Results

How it Works

Because all work is carried out externally:

There’s no need to move out during installation
Internal walls, rooms, and finishes are left untouched
No additional internal decorating costs

You’ll also benefit from a wide choice of colours, textures, and finishes, allowing you to completely refresh the look of your property while improving its performance.

Energy Efficiency & Cost Savings

External wall insulation can help reduce heat loss through solid walls by up to 45%, leading to:

Lower heating bills
Improved indoor comfort
Reduced cold spots and condensation

This is why EWI has become increasingly popular across the UK, especially for older homes. It’s also one of the most rewarding services we offer, as it delivers both visual transformation and long-term energy savings.

Is External Wall Insulation Right for Your Home?

If you live in an older property, particularly one built before the 1920s, you may notice:

Higher heating costs in winter
Cold internal wall surfaces
Condensation or damp issues

These issues are common in homes with solid brick walls, which are poor at retaining heat. The good news is that solid walls can be effectively insulated using EWI.

Do You Need External Wall Insulation?

How it Works

Cavity wall insulation is usually cheaper and easier to install, but it is not suitable for every property.

EWI is designed for homes that:

Do not have cavity walls, or
Are considered hard to treat, where cavities are too narrow or unsuitable for insulation

How Does External Wall Insulation Work?

How it Works

EWI creates a continuous thermal barrier around your home, reducing heat loss through the walls.

The system uses expanded polystyrene (EPS) insulation boards, which contain thousands of trapped air pockets, making them highly effective insulators. These boards are:

Lightweight
Easy to shape around windows and doors
Fixed securely to the wall using specialist anchors

A reinforced base coat and glass fibre mesh are applied to provide strength and durability. Finally, a primer and decorative render finish are added, leaving your property looking refreshed and modern.

The insulation typically adds around 90mm to the external wall depth, which does not significantly alter the appearance or proportions of your home.

Installation Process & Timescale

How it Works

The installation process usually takes several days, depending on the size of the property and weather conditions. As all work is completed externally: